070 1414 00_Tektronix_577_Curve_Tracer_Service_Feb88 00 Tektronix 577 Curve Tracer Service Feb88

User Manual: 070-1414-00_Tektronix_577_Curve_Tracer_Service_Feb88

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577 01 or 02
CURVE TRACER

COMMITTED TO EXCELLENCE

WARNING
THE FOLLOWING SERVICING INSTRUCTIONS
ARE FOR USE BY QUALIFIED PERSONNEL ONLY.
TO AVOID PERSONAL INJURY, DO NOT
PERFORM ANY SERVICING OTHER THAN THAT
CONTAINED IN OPERATING INSTRUCTIONS
UNLESS YOU ARE QUALIFIED TO DO SO.

PLEASE CHECK FOR CHANGE INFORMATION
AT THE REAR OF THIS MANUAL.

577 01 or 02
CURVE TRACER
SERVICE

INSTRUCTION
Tektronix, Inc.
P.O. Box 500
Beaverton, Oregon
070-1414-00
Product Group 48

97077

MANUAL

Serial Number _ _ _ _ __
First Printing JUN 1973
Revised FEB 1988

Copyright @) 1973 Tektronix, Inc. All rights reserved.
Contents of this publication may not be reproduced in any
form without the written permission of Tektronix, Inc.
Products of Tektronix, Inc. and its subsidiaries are covered
by U.S. and foreign patents and/or pending patents.

8

TEKTRONIX, TEK, SCOPE-MOBILE, and
are
registered trademarks of Tektronix, Inc. TELEQUIPMENT
is a registered trademark of Tektronix U.K. Limited.
Printed in U.S.A. Specification and price change privileges
are reserved.

INSTRUMENT SERIAL NUMBERS

Each instrument has a serial number on a pa~el insert, tag,
or stamped on the chassis. The first number or letter
designates the country of manufacture. The last five digits
of the serial number are assigned sequentially and are
unique to each instrument. Those manufactured in the
United States have six unique digits. The country of
manufacture is identified as follows:

BOOOOOO
100000
200000
300000
700000

Tektronix, Inc., Beaverton, Oregon, USA
Tektronix Guernsey, Ltd., Channel Islands
Tektronix United Kingdom, Ltd., London
Sony/Tektronix, Japan
Tektronix Holland, NV, Heerenveen,
The Netherlands

577-01 or 02 Service

TABLE OF CONTENTS
SECTION 1

SECTION 2

SECTION 3

SECTION 4

SPECI FICATION
Introduction
Characteristics
Electrical
Collector Supply
Step Generator
Display Amplifiers
Indicator and CRT (Display
Module)
Power Input
Environmental
Temperature
Altitude
Transportation
Physical
Net Weight
Dimensions
OPERATING INFORMATION
Introduction
Preliminary
Function of Controls
577
01 and 02
Familiarization
CIRCUIT DESCRIPTION
General
Block Diagram Description (577)
Circuit Description (577)
Power Supply
Step Generator
Step Amplifier
Horizontal Amplifier
Vertical Amplifier
Collector Supply
Block Diagram Description
(01 and 02)
Circuit Description (01 and 02)
Deflection Amplifier
CRT Circuit
High-Voltage Regulator
High-Voltage Output
CRT Control Circuits
Storage Circuit (01 only)
MAINTENANCE
Introduction
Preventive Maintenance
General
Cleaning
Lubrication
Visual Inspection
Transistors and Integrated Circuits
Recalibration

REV. B, MAY, 1977

Page
1-1

SECTION 4

1-1
1-2
1-2
1-3
1-3
1-3
1-3
1-3
1-3
1-3
2-1
2-1
2-1
2-3
2-3
3-1
3-1

3-11
3-11
3-11
3-12
3-12
3-12

4-2
4-2
4-2
4-3
4-3
4-6
4-6
4-6
4-6
4-7
4-7
4-7
4-7
4-7

CHECK AND ADJUSTMENT PROCEDURE
5-1
Introduction
Services Available
5-1
Test Equipment Required
5-1
Short-Form Performance Check
5-1
Procedure
Performance Check
5-3
5-23
Short-Form Adjustment Procedure
5-24
Adjustment Procedure

SECTION 6

ELECTRICAL PARTS LIST
577
01
02

SECTION 7

DIAGRAMS
Diagrams and Circuit Board
Illustrations
7-1
Voltage and Waveform Test
Conditions
7-2
Location of Test Points and Adjustments
Diagrams
Circuit Board Illustrations

SECTION 8

MECHANICAL PARTS LIST
Mechanical Parts List
Mechanical Parts List Illustrations

4-1
4-1
4-1
4-1
4-1
4-1
4-2

Page

SECTION 5

3-1
3-2
3-5
3-8
3-8
3-10
3-10

MAINTENANCE (cont)
Troubleshooting
Introduction
Troubleshooting Equipment
Troubleshooting Aids
Circuit Board Removal and
Replacement
Removal of Main Circuit Board
Replacing the Main Circuit Board
Replacing the Side Rail
Removal of the Collector Sweep
Board
Access to Power Supply Circu it
Board
Removal of Power Supply Circuit
Board
Miscellaneous
Max Peak Volts-Series Resistors
Knob Alignment
Removal of Display Unit from
Mainframe
Removal of 577-Test Fixture
Interface Connector
Replacement of 577-Test Fixture
Interface Connector
Repackaging for Shipment

CHANGE INFORMATION

8-1

COLLICTOIlt IUf'f'LY

~ f!J77 f~:'

...

• .,Jll'

1414· 01

577 Curve Tracer

577·01 or 02 Service

REV SEP 1981

Section 1-577-01 or 02 Service

WARNING NOTICE
Your 576 or 577/177 is designed to be a very versatile and flexible characteristic curve tracer
capable of testing both high voltage and high current devices. The 576 collector supply can
generate peak voltages up to 1500 volts, the 577/177 up to 1600 volts, and both are cable of
generating up to 10 amps at lower voltages. This wide range of voltage and current makes it
possible for you to test a very wide range of devices. However, these supplies are potentially
very dangerous.
It has come to our attention that it is becoming increasingly common for our customers to
connect 576's and 577/177's to devices or fixturing external to the instrument and thus external
to or outside of the safety features that are designed into the instruments.
We have provided a wide range of adapters that are designed to allow you to test your devices
while inside the plastic protective cover. However, if you feel it is necessary to connect the
collector supply to devices or fixturing outside of this protective cover, in effect defeating the
built-in safety features of the instrument, the following simple modification will at least allow you
to do so with the plastic protective cover still installed. This will reduce the chances of the
operator coming into contact with the collector supply voltage.
This simple modification will prevent exposed contacts at the instrument's test fixture . Th is
prevents operators from exposure to dangerous voltages only at the curve tracer end of
the external wires. Exposure to dangerous voltage is still possible at the external fixture
connections and the DUT. If external wireslfixturing are used by your organization, then it is
your responsibility to ensure that the necessary safeguards (additional
protective cover, Interlocks, etc.) to protect the operators are provided.

Modification
Drill a hole or otherwise remove just enough material from one of the sides of the plastic
protective cover as shown on the attached drawing, to allow the necessary leads to be brought
out through the side of the cover.
If you have misplaced or damaged the plastic protective cover, order a replacement through
your local Tektronix Field Office, for the plastic protective cover is an integral part of the safety
features for these instruments.
A plastic protective cover that has been modified (notched) is available from Tektronix by
ordering part number 337-1194-02.

WARNING
DANGEROUS VOLTAGE MAY STILL BE EXPOSED AT THE DEVICE OR
FIXTURE END OF THE CABLES WHICH YOU BRING OUT OF THE
PLASTIC PROTECTIVE COVER. IT IS YOUR RESPONSIBLITY TO
PROVIDE SAFEGUARDS TO PROTECT THE OPERATOR AT THE CABLES
END.

a

Section 1-577-01 or 02 Service

COVER MODIFICATION
Drill a hole, notch or otherwise remove just enough material, from the left side of the plastic
protective cover box (as shown in Fig. A) to allow test leads to be brought out through the cover.
This will allow the cover to be kept in place while using outside test fixturing.

PROTECTIVE COVER "NOTCHED" TO ALLOW TEST LEADS
TO BE BROUGHT OUT THROUGH THE COVER WHILE LEAVING THE COVER IN PLACE.

Figure A

b

Section 1-517-01 or 02 Service

SPECIFICATION
Introduction
The 577-D1 or D2 Curve Tracer and Display Unit is the
mainframe of a curve tracer system. The plug·in test
fixtures are covered in separate service manuals.

The system is a dynamic curve tracer that permits the
display of characteristics of a variety of devices.

The 577 is designed to bolt to the display module that is
available in either a storage (D 1) or non-storage (D2) version.

3.5 kV accelerating potential ensures a bright display on
the 8 x 10 division (1/2·inch or 1.27 cm/Div) internal
graticule.

The 577 features include pulsed steps, calibrated step
offset, step polarity tracking with collector supply polarity,
independent horizontal and vertical magnifiers, and auto·
matic display positioning when used with the 177 Test
Fixture. When used with the 177 Test Fixture, the display
dims automatically when the collector supply voltage is
,reduced to zero.

collector supply is disabled if the MAX PEAK POWER
WATTS setting is above .6 for serial numbers 8010200 and
up (577-D1) and 8010120 and up (577·D2), or the SERIES
RESISTORS switch is below 8 k for serial numbers below
8010200 (577-D1) and 8010120 (577·D2).

The horizontal display amplifier measures voltage ranging
from 5mV/DIV to 200V/DIV and base voltage from
5 mV/DIV to 2 V/DIV. The STEP GEN position of the
HORIZ VOL TS/DIV switch permits the step generator
output to be displayed. Illuminated knob·skirt readout is
provided on the horizontal and base-step switches.

A safety interlock provides operator protection from
hazardous potentials. Interlock can be defeated from the
test fixture.

This instrument is intended to be operated from a
single-phase earth·reference power source having one
current·carrying conductor (the Neutral Conductor) near
earth potential. Operation from power sources where both
current-carrying conductors are live with respect to earth
(such as phase·to-phase on a three·wire system) is not
recommended, since only the Line Conductor has
over-current (fuse) protection within the instrument.

The collector supply, 0 to 1600 volts in five ranges, is
continuously variable within each range.

A step generator supplies either current or voltage steps.
Current steps are 5 nAiStep to 200 rnA/Step and voltage
steps are 5 mV /Step to 2 V /Step. Single or repetitive steps
of up to 10 steps per family (approximately 1 to 95 steps
per family in STEP X.1) can be applied to the device under
test.

When using the 177 Standard Test Fixture, vertical
current limiting protects the device under test. When the
device under test current causes the display to exceed 2.5
times full-screen vertical deflection for a short time, the

This instrument has a three-wire power cord with a
three-terminal polarized plug for connection to the power
source and safety earth. The safety-earth terminal of the
plug is directly connected to the instrument frame. For
electric-shock protection, insert this plug only in a mating
outlet with a safety·earth contact. The color-coding of the
cord conductors is in accordance with recognized standards.

The electrical and environmental characteristics shown
are valid for instruments operated in an ambient
temperature range from +1O°C (+50° F) to +40°C (+104°F)
after a five-minute warmup, if calibrated at +20° C (+58° F)
to +30°C (+86°F).

CHARACTERISTICS
ELECTRICAL

)

®

Collector Supply
Voltage Ranges
Max Peak Current
Peak Current, Pulsed
Min Series Resistance
Max Series Resistance

6.5 V
10A
20A
.12 n
8kn

25V
2.5 A
5A
1.9 n
120kn

100V
0.6A
1.25 A
30n
2Mn

400 V
0.15 A
0.31 A
500n
8Mn

1600 V
0.04 A
0.08 A
8kn
8Mn

1-1

Specification-577-Dl or 02 Service
Series Resistances Available: 0.12 il, 0.5 il, 1.9 il,
7.5 il, 30 il, 120 il, 500 il, 2 kil, 8 kil, 30 kil, 120 kil,
500 kil, 2 Mil, and 8 Mil, all within ±15%,±0.1 il.

Maximum Voltage (Steps and aiding offset): 20 times
STEP/OFFSET AMPL switch setting.
Maximum Current: at least 100 mAo

Step Generator

Short Circuit Current Limiting: Not more than 200 mAo

Accuracy (current or voltage steps, including offset)
Incremental: The amplitude of any step is within 2% of
any other step.
Absolute: Within 3% of STEP/OFFSET AMPL switch
setting or 3% of total output, whichever is greater.
Within 4% of total output when using 10 steps, in STEP
X.l

OFFSET MUL T Range: Continuously variable from 0 to 10
times or from 0 to 100 times STEP/OFFSET AMPL switch
setting, depend ing on the STEP X.l setting, either aiding or
opposing the step generator polarity.

Maximum Opposing Offset Voltage: 10 times the STEP/
OFFSET AMPL switch setting.
Maximum opposing Current: Limited between 10 mA
and 20 mA at zero volts, going down to zero current at
20 V, opposing.

Pulsed Steps: Pulsed steps, approximately 300 /.Is, produced
when the PU LSED 300/.ls, button is pushed to the in
position.

Number of Steps: Ranges from 1 to 10 as selected by the
NUMBER OF STEPS control (STEP X.l button in).
Approximately 1 to 95 steps when STEP X.l button is
released (button out).

Current Mode
STEP/OFFSET AMPL
Switch Range: 200 mA/Step to 50 nA/Step in a 1-2-5
sequence with STEP X.l knob pushed in (X 1 position).
20 mA/Step to 5 nA/Step in a 1-2-5 sequence with STEP
X.l knob in the out position (X.l position).
Maximum Current (steps and aiding offset): 20 times
STEP/OFFSET AMPL switch setting, except at least 10
times switch setting when switch is set to 200 mA/Step
and 15 times switch setting when switch is set to
100 mA/Step.
Maximum Voltage: At least 7 volts, up to 1 A total
output, and at least 5 volts, up to 2 A total output.
Maximum Opposing Offset Current: 10 times STEP/
OFFSET AMPL switch setting up to 10 mAo Not more
than 20 mAo
Maximum
5 volts.

Opposing Voltage:

Between

Display Amplifiers
Display Accuracies (percent of highest on-screen value)
Vertical: See Test Fixture Service Manual for system
specification.
Horizontal Collector Volts: 3%, unmagnified, and 4%
magnified.
Horizontal Base Volts: 3%, unmagnified, and 4%, magnified.
Horizontal Step Generator: 4%, unmagnified, and 5%,
magnified.

1 volt and
Deflection Factors
Vertical: See Test Fixture Service Manual

Voltage Mode
STEP/OFFSET AMPL
Switch Range: 50 mV/Step to 2 V/Step in a 1-2-5
sequence with STEP X.l button pushed in 1X 1 position). 5 mV/Step to 200 mV/Step with STEP X.l knob
in the out position (X.l position).

1-2

Horizontal Collector Volts: 50 mV /DIV to 200 V/DIV
in a 1-2-5 sequence, unmagnified. 5 mV/DIV to
20V/DIV in a 1-2-5 sequence, magnified.
Horizontal Base Volts: 50 mV/DIV to 2 V/DIV in a
1-2-5 sequence, unmagnified. 5 mV/DIV to .2 V/DIV in
a 1-2·5 sequence, magnified.

®

Specification-577-01 or 02 Service
Power Cord Conductor Identification

Display Positioning Accuracy, using POLARITY switch
(with 177 only):
Spot positioning with change in POLARITY switch
setting (using AC position as a reference).

AC
+(NPN)
-(PNP)

Vertical

Horizontal

Centered
-4div
+4div

Centered
-5 div
+5 div

Conductor

Color

Alternate Color

Ungrounded (Line)
Grounded (Neutral)
Grounding (Earthing)

Brown
Blue
Green-Yellow

Black
White
Green-Yellow

ENVIRONMENTAL
Temperature
Specified Operating: +lO°C (+50° F) to +40°C (+104°F).

Indicator and CRT (Display Module)
Cathode Ray Tube
Type: Electrostatic Deflection.
Phosphor:

Altitude
Operating: to 10,000 feet.

02 (non-storage): P31 (standard).
01 (storage): Equivalent to Pl.
Accelerating Voltage: 3.5 kV.

Transportation
12-inch package drop: Qualified under the National Safe
Transit Committee procedure lA.

Storage Characteristics (01)
Storage Time: 1 hour.

PHYSICAL
Net Weight
Power Input

Main frame: Approximately 40 pounds (18.1 kg).

Line Voltage (RMS)
Nominal: 100V, 110V, 120V, or 200 V, 220V,
240 V, within 10%.
Line Freqeuncy
Range: 50 to 60 Hz.
Maximum Power at 110 VAC, 60 Hz: 155 W (1.7 A).

REV. C, MAY, 1977

Dimensions
Length (without test
fixture) :

~22

Width:

~8

Height:

~14

1/4 inches

1/3 inches
5/8 inches

1-3

Section 2-577-01 or 02 Service

OPERATING INFORMATION
Introduction

NOTE

The 01 (storage) and 02 (non-storage) display modules
operate with the Tektronix 577 Mainframe and a test fixture
to form a curve tracer system.
This section of the manual gives a brief functional description of the front-panel controls and connectors and a
familiarization procedure.

The normal step generator polarity is positive-going in
+ DC, +, andAC, and negative-going in - and -DC.
Step generator polarity can be inverted by either the
STEP/OFFSET POLARITY switch or the test fixture
Terminal Selector.

VARIABLE
COLLECTOR %

Provides uncalibrated, continuously variable control of collector
supply amplitude from 0% to
100%. of the voltage selected with
the MAX PEAK VOLTS switch.

MAX PEAK VOLTS

Selects one of five collector supply
voltages.

SERIES RESISTORS
and PEAK POWER
WATTS switches

Fourteen resistor values coupled
to the MAX PEAK VOLTS switch
to maintain one of six labeled
peak-power limits. The SERIES
RESISTORS and PEAK POWER
WATTS switch pulls out to unlock
from the MAX PEAK VOLTS
switCh to change the power setting. Lower power settings are
available on all except the highest
voltage range.

Preliminary
The Operating Instructions section of the appropriate
Operators Manual should be referred to for initial preparation. The Operators Manual contains operating information
as well as general and specific applications information.

Function of Controls
This is a brief description of the functions of the frontpanel controls.

571
COLLECTOR SUPPLY
POLARITY'
+DC

Applies positive DC to the collector terminals of the test fixture.

+

Applies positive sweeping voltage
at twice line rate to the collector
terminals of the test fixture. See
PULSED 300 f.Ls.

AC

Applies AC at power line frequency to the test fixture collector terminals (use slow step rate).
Applies negative sweeping voltage
at twice line rate to the test fixture
collector terminals. See PULSED
300 f.Ls.

-DC

Applies negative DC to the test
fixture collector terminals.

CAUTION
When enabling the col/ector supply, changing polarity,
or peak voltage range, always set the Left/Right device selector to center as transients may appear
which exceed the indicated maximum peak voltage.

'Automatic trace position, with polarity change, is maintained in all
switch positions.

REV DEC 1981

COLLECTOR SUPPLY The yellow lamp is lighted when
DISABLED (Indicator
the test fixture protective lid is not
Lamp)
closed over the test terminals (unless modified by a wiring option in
the test fixture) whenever the
MAX PEAK VOLTS switch is in
the 100 V, 400 V, or 1600 V position. The yellow lamp pulses (on
and off) if the vertical current limiting circuit disables the collector
sweep.
COLLECTOR SUPPLY Protects the collector supply from
CIRCUIT BREAKER
excessive power dissipation. Push
to reset breaker after circuit
interruption.
PULSED 300 f.Ls
(Pushbutton)

With the PULSED 300 f.Ls
pushbutton in the in position
(Pulsed Mode), the step generator
produces 300 f.LS wide pulses at 1
or 2 times line frequency, depending on the Step Rate selected.

STEP FAMILY REP

With this pushbutton in the in position, up to ten steps per family are
generated, depending on the position of the NUMBER OF STEPS
control. When the pushbutton,
STEP X.1, concentric with the
STEP/OFFSET AMPL switch, is in
the out position, the NUMBER OF
STEPS control provides from
about 1 to 95 steps.

2-1

Operating Information-577-01 or 02 Service
SINGLE

Each time the SINGLE button is
pressed, a single family is generated.
Upon release, the step generator is
turned off.

SLOW (lX LINE
Frequency)

When the SLOW button is in the in
position, the generator stepping
rate is at power-line frequency.

NORM (2X LINE
Frequency)

FAST (4X LINE
Frequency)

When the NORM button is in the in
position, the generator stepping rate
is twice the power-line frequency.
When the FAST button is in the in
position, the generator stepping
rate is four times the power-line
frequency.

OFFSET MULT

Multiturn control providing DC offset from 0 to 10 times the STEP/
OFFSET AMPL switch setting with
the STEP X.1 button in. 0 to 100
times with the STEP X.l button
out.

OFFSET (ZERO
button)

I n the out position, the offset
voltage is determined by the OFFSET MUL T control.

OPPOSE (AI D button) In the in position, the offset voltage
aids in the step generator signal.
When the OPPOSE button is in the
out position, the offset voltage opposes the step generator signal.
HORIZ VOL TS/DIV
(knob)

NOTE
Step transitions occur at the start of the collector
supply sweep in SLOW and NORM modes. Transitions occur at both the start and the peak of the
collector supply sweep in the FAST mode.
FAST and SLOW

NUMBER OF STEPS

When FAST and SLOW buttons are
in the in position simultaneously,
the generator stepping rate is twice
the power-line frequency, but the
step transitions occur at the peaks
of the collector supply sweeps.
Continuously variable control
selects the number of steps per
display.

STEP/OFFSET AMPL Selects from 21 current steps, from
50 nA/Step to 200 mA/Step, or six
voltage steps from .05 V/Step to
2 V/Step in a 1-2·5 sequence.
STEP X.1

STEP/OFFSET
POLARITY

2-2

Push-push knob concentric with
STEP/OFFSET AMPL knob. When
this knob is released (out position)
the step amplitude is reduced to
.1X the previous amplitude and is
ind icated by the ilium inated area of
the STEP/OFFSET AMPL knob
skirt. The number of steps available
changes to approximately 1 to 95
steps.
When the NORM pushbutton is in
the in position, the step voltage is
the same polarity as the collector
sweep unless inverted by the test
fixture.

Selects from 12 calibrated collector
deflection factors from .05 V/DIV
to 200 V/DIV or from 6 calibrated
base deflection factors from
50 mV/DIV to 2 V/DIV, unmagnified. With the Xl0 HORIZ MAG
in the out position, the deflection
factors are 5 mV/DIV to 20 V/DIV
or 5 mV/DIV to .2 V/DIV. All
steps follow a 1-2-5 sequence.

Horizontal POSITION Provides uncalibrated horizontal
(knob)
positioning over at least ±10 graticu Ie divisions.
Xl0 HORIZ MAG
PULL

Pulling the Horiz POSITION knob
to the out position provides ten
times magnification of the horizontal display.

DISPLAY INVERT

When the NORM pushbutton is in
the in position, a normal display is
presented. When the NORM button
is out, the display is inverted, both
horizontally and vertically.

DISPLAY FILTER

Full vertical bandwidth is obtained
with the NORM pushbutton in the
in position. When the NORM button is in the out position, vertical
bandwidth is limited to reduce
noise on the trace.

Vertical POSITION
(knob)

Provides uncalibrated vertical positioning over at least ±8 divisions.

Xl0VERT MAG
PULL

Pulling the Vertical POSITION
knob to the out position provides
ten times magnification of the vertical display.

Operating Information-571-D1 or D2Service

D1 and D2
INTENSITY

Controls display brightness

FOCUS

Provides adjustment to provide a
well-defined display.

3. Set the D1 or D2 front-panel controls as follows:

NOTE

BEAM FINDER

Brings beam on screen; limits the
display to the area inside the graticule.

POWER

Turns instrument power on and off.

TRACE ROTATION
(rear panel)

Permits alignment of the trace with
respect to the graticule lines.

UPPER and LOWER
STORE

Button pushed in selects storage
operation. Button out selects normal operation without storage.
Each button has a push-push action
and is independent of the other.

UPPER and LOWER
STORE

ERASE

BRIGHTNESS

Complementary cancelling switches
select the screen to be erased. Both
buttons pushed in selects both
screens.
Momentary contact pushbutton
initiates erasure of the stored image
selected by the Erase Selector.
Provides continuously variable
flood-gun current duty cycle from
about 10% to 100% (when the
collector sweep is turned down or
d isab Ied), perm itting extended
retention of displayed information.
Also controls the degree of spot
dimming when collector sweep is
turned down or disabled.

Familiarization
The following steps demonstrate the use of the controls
of the D1 or D2. Follow the procedure for familiarization.

Setup Information

When first receiving the instrument and when it has
been turned off for two weeks or more turn the
BRIGHTNESS control fully clockwise, and place the
push-push STORE switches (UPPER and LOWER) in
the in position. Turn the INTENSITY control fully
counterclockwise. Turn the power on and note that
after a short delay the screen becomes fully illuminated. Leave the instrument in this mode for five
minutes before erasing or going to the non-store
mode.

D1-D2
INTENSITY
FOCUS

counterclockwise
centered
D10nly

BRIGHTNESS
STORE
UPPER and LOWER
ERASE
UPPER and LOWER

counterclockwise
out position
either position

4. Pull the POWER switch to the ON position.

5. Allow one minute for instrument warm-up.

6. Set the 577 Curve Tracer system controls as follows:

MAX PEAK VOLTS
25
MAX PEAK POWER WATTS .15
VARIABLE COLLECTOR % 0
COLLECTOR SUPPLY
POLARITY
AC
All Dark Gray Buttons
pushed in
HOR IZ VOL TS/D IV
1 V, COLLECTOR
VERTICAL CURRENT/DIV 1 mA
LEFT-RIGHT Switch
off (centered)
Terminal Selector
EM ITTER GROUNDED
BASE TERM, STEP GEN

1. Be sure that the Curve Trace system is complete. The
D 1 or D2 must be properly connected to the 577
mainframe (with the test fixture in place).

2. Set the POWER switch to Off and connect the Curve
Tracer system to a power source that meets the voltage and
frequency requ irements in the Operating Instructions of the
577 system Operators Manual.

®

7. Slowly turn the INTENSITY control clockwise, while
pressing the BEAM F IN DE R button, until a spot appears in
the CRT viewing area. To avoid burning the CRT phosphor,
adjust the INTENSITY control until the spot is easily
visible, but not exceptionally bright. Position the spot to
graticule center and release the BEAM FINDER button.

2-3

Operating Information-571-D1 or 02 Service
8. Adjust the FOCUS control for a sharp, well-defined
spot.

9. Turn the VARIABLE COLLECTOR % control to
produce a ten-division horizontal trace on the CRT graticule.

10. Adjust the INTENSITY control for the desired
viewing level .(brightness).. Adjust the FOCUS control for a
sharp, well-defined display over the trace length.
11. Vertically position the trace to center horizontal
graticule line. If the trace is not parallel to the center
horizontal line, see Trace Alignment Adjustment in this
section.

Turn the INTENSITY control slowly clockwise to
produce a trace of normal viewing intensity, then turn the
control (INTENSITY) fully counterclockwise. A stored
display should remain on the screen.

Separate STORE switches are provided for the upper
and lower storage screens, permitting independent screen
use. When both screens are operated in the non-store mode
(both UPPER and LOWER STORE buttons out) the
instrument provides a normal display. When either or both
screens are operated in the storage mode (applicable
STORE button in) a display can be retained for further
analysis.

A stored display is erased by first selecting the screen to
be erased, then pushing the ERASE button. The erasure of
one screen has no effect on the other. The UPPER and
LOWER ERASE buttons are interlocked to provide cancellation of either switch when the other is pressed. However,
either screen, or both, can be selected for erasure.

Beam Finder
1. Move the display off screen with the Vertical
POSITION control.

2. Push the BEAM FINDER button and observe that
the display returns to within the graticule area. Reposition
the display to graticule center and release the BEAM
FINDER button.

Storage Operation (01)
Turn the INTENSITY control counterclockwise and
press both UPPER and LOWER STORE buttons. A
background light level will be present on the storage
screens.

Simultaneously press both the UPPER and LOWER
screen-selector buttons. Push the E RASE button to erase
both screens; this prepares the targets for storage.

2-4

To demonstrate independent storage screen operation,
push the ERASE, UPPER, screen selector button to release
the ERASE, LOWER button. Press the ERASE button and
note that only the upper screen erases. Push the ERASE,
LOWER button (ERASE, UPPER button releases) and
press the ERASE button. Set either screen to non-store
(STORE button out) and note that the other screen is fully
operable in the storage mode, permitting simultaneous store
and non-store operation.

The brightness (intensity) of the CRT display is controlled from the INTENSITY control. This control is
adjusted for an easily visible but not excessively bright
display. Readjustment may be necessary for different
displays.

Particular care should be exercised when only a spot is
displayed, as a high-intensity spot can burn the CRT
phosphor. Permanent damage may result if a stationary
spot remains too long.

®

Section 3-577-01 or 02 Service

CIRCUIT DESCRIPTION
General
This circuit description is divided into two parts: a block
diagram description and a circuit description.

The block diagram description describes the functions of
the major circuit blocks, using the overall block diagram
included in the diagrams section at the rear of the manual.

The circuit description provides a more detailed description of each of the major circuits. Some individual block
diagrams are included with the text in this description.
Complete schematic diagrams, including component numbers and component values, are provided on the pullouts at
the rear of the manual.

under test, amplify the resulting signals, and apply these
signals to the CRT deflection plates. The deflection factors
of these amplifiers are controlled by the VERTICAL
CURRENT/DIV and HORIZ VOL TS/DIV switches.

CIRCUIT DESCRIPTION (577)
The following analysis provides a description of the
major circuits in the curve tracer, with special emphasis on
those areas of unique or especially complex circuitry.

Power Supply

BLOCK DIAGRAM DESCRIPTION (577)

The low-voltage power supply provides five regulated
and five unregulated dc voltages and three ac voltages,
derived from T701.

The 577-D1 or D2, when used with the appropriate test
fixture, is a dynamic curve tracer system that measures and
displays the characteristics of a wide variety of devices. The
collector supply and step generator circuits produce operating voltages that are applied to the device under test. The
display amplifiers measure the results of the voltages
applied to the device under test. These measurements result
in the display (on the CRT) of the characteristics of the
device.

The regulated dc voltages are: -30 V, -12 V, +5 V,
+12 V, and +30 V. The unregulated dc voltages are: -40 V,
+40 V, +200 V and two voltages, +10 V and +40 V (step
amplifier supplies with the step amplifier common being
the reference).

The collector supply circuit produces full-wave rectified,
filtered or unfiltered, sine waves (either negative going or
positive going) or unrectified sine waves, depending on the
positions of the COLLECTOR SUPPLY POLAR ITY switch
or the PU LSED 300 I1S button. The signal amplitude can be
varied from 0 to 1600 volts, determ ined by the settings of
the MAX PEAK VOLTS switch and the VARIABLE
COLLECTOR % control. The collector supply output is
connected to the collector, or equivalent, terminal of the
device under test_

The step generator produces ascend ing steps of current
or voltage at a Normal rate of one step for each half-sine
wave of the collector supply. The current or voltage step
amplitude is controlled by the STEP/OFFSET AMPL
switch. The number of steps produced is controlled by the
NUMBER OF STEPS control. The step generator output is
applied to either the base or emitter terminals (or equivalent) of the device under test.

The display amplifiers are connected to the device under
test. These amplifier circuits sense the effects of the
collector supply and step generator output on the device

®

The three ac voltages are used for: D1 Display Unit
flood-gun heaters, 6.3-volt CRT heater (elevated to
-3400 volts), + and -15 volts for the collector sweep
board, and a gO-volt, ac, p-p, signal (from the same
secondary as the +40 and -40-volt supplies) used as a line
phase reference in the step generator.

-30-Volt Supply. The -30-volt supply consists of
CR751 (a diode bridge also shared with the +30-volt
supply); a filter, C771; a reference diode, VR772; an error
amplifier, 0772-0786; and a series regulator, 0788.

VR772 sets the voltage on 0772 emitter. Any variation
in the -30-volt supply output level (set by R775) is
compared to the reference voltage on the emitter through
the divider (R77:, R775, and R776). Any variation in
0772 base voltage is amplified by 0772 and 0786. This
amplified error sigllal controb 1.1e conduction of 0788.

The --30-volt supply is short-circuit protected. If the
current through series regulator 0788 causes a drop in
excess of approximately 0.7 volts across R786, CR785
conducts, turning on 0786, which turns off the series
regulator, limiting the current to a safe level.

3-1

Circuit Oescription-577-01 or 02 Service
+30-Volt Supply. The +30-volt supply consists of the
diode bridge (shared with the -30-volt supply); a filter,
C751; an error amplifier, 0754; a series regulator, 0766;
and short-circuit protection, 0760.

+12-Volt Supply. The +12-volt supply consists of a
diode bridge, CR721 (shared with the +5·volt supply); a
filter, C721 (also shared with the +5-volt supply); and a
monolithic regulator, U722. U722 is identical to U732 and
is designed to provide short-circu it and thermal protection.

The -30 volts at the bottom of divider
R763-R765-R764 is the reference for the +30-volt supply.
Any change in the +30-volt output level causes a change at
the variable tap on R765 (about zero volts, DC). The
voltage at R765 tap is compared to 0754 emitter voltage
(approximately -0.7 volts, set by CR755). Any variation is
amplified by 0754 and controls the conduction of the
series regulator, 0766.

+5-Volt Supply. The +5·volt supply consists of CR721
and C721; and a monolithic regulator, U724, which is
designed to provide short-circuit and thermal protection.

Step Generator
The step generator consists of three major sections: the
clock, the staircase generator, and the pulse generator. See
Fig. 3-1.

The +30·volt supply is short·circuit protected. When
current through the series regulator, 0766, reaches a value
that causes the drop across R766 to reach approximately
0.7 volt, 0760 turns on, limiting the base drive to 0766,
limiting the current to a safe level.

The clock circuit produces a negative-going clock pulse
that determines the rate and phase (with respect to the
collector supply) of the step generator output.

-12-Volt Supply. The -12-volt supply consists of a
diode bridge, CR731; filters 731 and C733; and a monolithic regulator, U732. The regulator is designed to provide
short·circuit and thermal protection.

The staircase generator produces a staircase of steps. It
also determines the number of steps, and whether a single
family or repetitive family of steps is produced.

.

S429

IpOl.SED'
I

I
I

R245
P611 PULSE INTENSIFICATION

U220A-8, U230,
0224,0234

J110-L
PULSE GENERATOR

n

STAIRCASE GENERATOR

f \ . _--..f U2~~~12 1-_1"TTTTI-+_--1 U~:;.o~:Sci&,
V
U268, U270
0324,0330

PIN 6
U350B

I
I
I

I
I
I

.. .. ..
I

r---I----I

1

I

I

SLOW NORM FAS
ISTEPRATEI
S426

I

I
I

I
I

I
I

I

I
I

I

J.

STEP

X.1

STEP AMP

0310

90V P.p

+

~--"1

I

.. II.

REP
SINGLE

1414-2

Fig. 3-1. Block diagram of the Step Generator.

3-2

REV. B, MAY, 1977

Circuit Oescription-577-01 or 02 Service
The pulse generator controls the output of the step
generator and may perm it only 300 p.s pulses instead of the
staircase. The three major sections of the pulse generator
are shown in Fig. 3-1, illustrating the major components.

The Clock Circuit. The clock circuit consists of phaseshift amplifier, U206; two zero-crossing comparators
(0210-0212 and 0260-0262); a four-wide, two-input gate,
U268; and a monostable multi, U270.

The input to the clock circuit (line frequency) is from
pin 8 of P392. This ac signal is fed to the base of 0260, one
of the zero-crossing comparators, and also to the input of
the phase-sh ift amplifier. The phase-shift amplifier shifts
the phase of the ac signal by 90° and feeds the phaseshifted signal to the bases of the other zero-crossing
comparators.

The zero-crossing comparators have four outputs, which
coincide with the four zero points of the sine-wave signal
and the phase-shifted signal. The phase-shifted signal is also
fed to the pulse generator circuit.

The four outputs are connected to the four-wide,
two-input gates of U268. The four signals at the input gates
of U268 correspond in time to the two zeros and two peaks
of one complete sine wave of the ac collector-supply
reference signal at the input of the clock circuit. The signals
at gates A and B (U268) respond to the peaks and gates C
and D respond to the zeros.

The ability of U268 to pass these signals is controlled by
the STEP RATE switch. If either input of any gate is
connected to a low level (zero), the gate will not pass a
signal.

If the SLOW button is pressed, gates A, B, and C, each
has one input tied to ground. A, Band C are disabled and
only gate D can pass the signal. This signal corresponds to
one zero crossing of the input sine wave.

The signals passed by U268 are applied to the input, pins
3 and 4 of U270.

U270 is a monostable multi having a time constant
set by R273-C273. The output of U270 is a constantwidth positive pulse which is applied to the staircase
generator. U270 may be disabled by applying a low level to
pin 5 of U270. This level is provided by U430A, which is
controlled by the step family switches.
The Staircase Generator.
STEP FAMILY REPETITIVE. The staircase generator
circuit consists of a common-emitter amplifier, 0276; an
integrator, U305A; a level detector, U305B; U220C and
U220D connected as a bistable multi; a reset transistor,
0306; and two common-emitter amplifiers, 0324 and
0330. The positive-going, constant-width input pulse from
U270 is applied to the input of the staircase generator
0276. The result is a negative-going pulse (at the collector
of 0276). The pulse amplitude (when STEP X.1 is pushed
in) is adjusted by the Step Amplitude control, R278. When
STEP X.1 is released, the pulse amplitude is adjusted by
R281. This negative-going pulse is applied to either C279 or
C280, depending on the setting of the STEP X.1 switch.

The negative-going step coupled by C279 or C280 causes
the - input of U305A, pin 6, to try to go negative, causing
the output of U305A, pin 7, to go positive to offset the
negative step on pin 6. This action produces a charge on
C306, causing a positive step at U305A output. The
amplitude of the positive-going step depends on the ratio of
C279 (or C280) to C306.

If the STEP X.1 button is pushed in, the amplitude of
each step is one-half volt. Each following pulse from 0276
causes an additional step at U305A output. These steps
continue until pin 2 of U305 goes more positive than pin 3
of U305B. The level at pin 3 is set by the NUMBER OF
STEPS control (front panel) and is adjusted from approximately zero to approximately 5 volts.

When the - input of U305B goes more positive than the
When the NORM button is pushed in, gates A and Bare
disabled, and gates C and D pass the signal. These signals
correspond to both zeros of the input sine wave.
If the FAST button is pressed, all gates pass the signal,
corresponding to both zeros and both peaks of the input
sine wave.
If the FAST and SLOW buttons are pressed simultaneously, gates C and D are disabled, permitting gates A and
B to pass signals correspond ing to both sine-wave peaks.

REV. C, MAY, 1977

+ input, the output switches to a - level. This - level is
applied as a low level to U220C, pin 13, causing U220C output, pin 11, to switch to its high level, causing a high level
at pin 4 of U220D. The high level on pin 4 of U220D does
not cause U220D to switch, since pin 5 is still at a low level.
The leading edge of the next positive pulse from U270, pin
6, is coupled through C274 to pin 5 of U220D, causing pin
6 of U220D to go low, causing a low on pin 12 of U220C,
keeping the flip-flop latched in this condition.

The low level at U220D output is connected to 0324
base, turning 0324 off and causing the collector level to go

3-3

Circuit Oescription-577-01 or 02 Service
high. The high level at 0324 collector does two things:
holds pin 5 of U220D at a high level and turns 0306 on.
This causes 0306 to discharge C306, which in turn causes
pin 7 of U305A to return to ground level.

Ground level on U305A, pin 7, causes U305B, pin 2 to
go to a level lower than that on pin 3 of U305B, causing the
output of U305B, pin 1, to go positive. This positive step
causes a high level on U220C, pin 13, but a switch cannot
occur since pin 12 of U220C is at a low level, the falling
edge of the positive-going pulse from pin 6, U270, is
coupled through C274 to pin 5 of U220D. U220D switches,
causing pin 6 to go high, causing a high level at pin 12,
U220C, causing pin 11 to go low, latching the flip-flop in
this condition. At this point another staircase will be
generated.

STEP FAMILY SINGLE. When the SINGLE button is
pressed, the REP button is released and one fam ily is
permitted to run.

When the REP button is released, pin 2 of U430A is
connected to 0324 collector. Since U430A is wired as in
inverter, whenever the collector of 0324 is high, pin 3 of
U430A is low, disabling U270. The base of 0330 is tied to
0324 collector, so that whenever the co "ector of 0324 is
high, 0330 is turned on, causing 0324 base to be at ground
level. 0324 is held in the off cond ition.

Pressing the SINGLE button causes 0330 base to be
grounded momentarily by C332. This permits 0330 co"ector to go to a high level, since pin 6 of U220D is high. 0324
collector goes to the low level, enabling U270, causing
pulses to run, and turning off 0330.

One step family runs as described previously, until pin 6
of U220D goes to the low state, and turns 0324 off,
permitting 0324 collector to go high, disabling U270,
turning 0330 on, latching until the single button is pressed
again.

The output of the staircase generator is applied to 0310
collector.

300 ps Pulse Generator. The 300 ps pulse generator
consists of gates U220A and U220B; a monostable multi,
U230; common-emitter pulse-intensification amplifier,
0224; and a common-emitter amplifier, 0234.

The gates in the input of the pulse generator (U220A
and U220B) operate similarly to the gates in the clock
circuit in the input of U268. The inputs to U220A and

3-4

U220B come from the zero-crossing comparators, 0210
and 0212. These input signals correspond in timing to the
peaks of the sine-wave signal (collector supply reference)
applied to the input of the step generator clock circuit. The
ability of U220A and U220B to pass these signals is
controlled by the PULSED 300 ps and the STEP RATE
buttons.

When either the STEP RATE NORM or FAST button is
pressed, while the PULSED 300 ps button is pushed in, pin
12 of U220A and pin 1 of U220B are permitted to go to
high levels, and both gates (U220A and U220B) pass the
signals.

When the STEP RATE SLOW button is pressed while
the PU LSED 300l1s button is pushed in, pin 1 of U220B is
low and U220B cannot pass the signal (only U220A passes
signal).

The output of U220A and U220B are coupled through
C223 and C226.and applied to the input of the monostable
multi, U230.

The time constant of the monostable multi is set by
C231-R231. A 300l1s pulse appears at both monostablemulti outputs (0 and Q) for each signal input. The 0
output, pin 6, has a positive-going 300 ps pulse, and the n
output, pin 1, has a negative-going 300 I1S pulse.

The IT output, pin 1, is normally about 5 volts (high
state) positive unless an input signal is applied, in which
case pin 1 goes to ground level for 300 I1S.

When Q is at its high level, 0234 is held on, causing its
collector to be at ground level, which holds 0310 off.

When Q goes to ground, 0234 turns off, causing 0310
to turn on for 300 I1S, perm itting a pulse step at the emitter
of 0310.

When the PULSED 300l1s button is not pushed in,
CR234 cathode is grounded, holding 0234 off.

The 0 output of U230 is normally at ground and goes
positive for 300l1s each time an input signal is applied to
the input. This positive-going step at 0 is delayed 100 I1S by
network R241-C242. After the 100 I1S delay, 0224 turns off
for 200l1s (30011s minus the 100l1s delay). As 0 (pin 6)
returns to the low level, CR241 turns on and 0224 is
immediately turned off. This process creates a negativegoing signal at 0224 collector, 200l1s wide, delayed by

REV. B, FEB. 1975

Circuit Oescription-577-01 or 02 Service
100/ls. The negative-going pulse on 0224 collector is used
to intensify the last 200 /lS of the 300 /lS pulse.

The PULSED 300/ls switch has two sections. The
section previously explained controls the signals through
U220A and U220B. When the PULSED 300/ls button is
pushed in, pins 3 and 4 of U268 are grounded, preventing
U268, A and B from passing signals in the PU LSED 300 J.,tS
mode. Only SLOW and NORM rates can be achieved when
in pulsed mode.

The remainder of the PULSED 300/ls switch permits
continuity (when pushed in) from terminal 2, P433, to the
STEP RATE switch to ground. When the PULSED 300 J.,tS
button is pushed in, and either the SLOW or NORM STEP
RATE button is pushed in, the collector supply goes
automatically to DC mode.

When the FAST STEP RATE button is pushed in, the
pulses occur at normal rate (2X line frequency) and the
collector supply is not switched automatically to DC mode.

Step Amplifier
The step amplifier converts the step generator output to
current or voltage steps for application to the device under
test. The STEP/OFFSET AMPL switch determines the
amplitude of these steps.

The step amplifier consists of an offset amplifier,
U350A; a current summing amplifier, U305B; an Xl
inverting or non-inverting amplifier; and an output amplifier.

For voltage steps, the output amplifier consists of
U380A, and 0384 or 0386 (depending on polarity). See
Fig.3-2A.

For current steps the output amplifier consists of
U380A; 0384 or 0386; 0450A and B; and U380B (an Xl
feedback amplifier). See Fig. 3-2B.

The offset amplifier, U350A, produces currents ranging
from 0 to 500/lA, of either polarity, depend ing on the
setting of the OFFSET mult dial and the ZERO-AID
buttons. The current is applied to the - input of U350B,
pin 6. The step generator signal, consisting of steps of
50 /lA each, is applied to pin 6.

Each 50/lA step to U350B input produces a negativegoing step of 0.4 volts at the output of U350B, pin 7. A

®

total of 10 steps, therefore, produces 4 volts at U350B
output. If the OFFSET AID button is pressed and the
OFFSET MUL T dial is set to 10.00, for an additional
4.0 volts at U350B output, the result is a total of 8.0 volts
at the tenth step level.

U350B output, at pin 7, is applied to U360. U360
operates as either an inverter or a follower (- or + one
times amplifier), depending on the setting of relay K436.
Pin 6 of U360 will be at the same voltage as U350B output,
whether the same or opposite polarity.

The position of K436 is controlled by the COLLECTOR
SUPPLY POLARITY switch; the STEP/OFFSET POLARITY INVERT switch; or the test fixture Terminal Selector
switch, in conjunction with the step generator polarity
logic, U430B, C, D, and 0326.

The step generator polarity is controlled by three inputs:
pin 9, U430C; pin 12, U430D; and pin 13, U430D.

Each of these three inputs controls the step generator
polarity. A change in logic level of anyone of these inputs
causes pin 6, U430B, level to change, resulting in 0436
turning either on or off. The condition of 0436 (on or off)
controls relay K436, the step amplifier polarity relay. When
pin 6, U430B, is high, 0436 is on and K436 IS activated.
This is the negative polarity position of the relay. When pin
6, U430B, is low, 0436 is off and K436 is not activated.
This is the positive position of relay K436.

The output of U430B also controls 0440. When 0436 is
on, 0440 is off, and vice versa. The collectors of 0436 and
0440 control two sets of diodes, CR441-CR438 and
CR439-CR440, which are reverse-voltage limiters in the
current mode.

The output step amplifier converts the output steps of
U360 to current or voltage steps at amplitudes determined
by the STEP/OFFSET AMPL switch. This amplifier is a
differential amplifer with separate feedback to each input.

The negative amplifier input, pin 3, controls the amplitude of the output steps. The positive amplifier input, pin
2, provides either feedback from the current-setting resistors in the current mode or a constant voltage level in the
voltage output mode.

Current Mode. To obtain current steps, the gain of the
negative side of the differential amplifier is set to provide
an output of 200 mV /Step. This output is connected to the
variable series current-setting resistors (R404-R427).

3-5

Circuit Oescription-577-01 or 02 Service

R396

R371-R375
1.5k TO 60 k

400 mV /STEP ....- - 1

VOLTAGE
SETTING
RESISTORS

DEVICE
UNDER
TEST

+
1.n
B
I -....-J\.M~~-I

FLOATING
POWER
SUPPLY

R392
-30 V
+1 AMPLIFIER

~

0450B
U380B
(A)

GROUND RETURN
TO STANDARD
TEST FIXTURE

+ VOLTAGE MODE

R 396/1R 397

R401-R427

+

U380A
3.01 k
400 mV/STEP _-VV""""__--t

DEVICE
UNDER
TEST

CURRENT
SETTING
RESISTORS

FLOATING
POWER
SUPPLY

R392
0384
+30 V
R388/1R389

R457

+1 AMPLIFIER
0450B
U380B

REVERSE
VOLTAGE
LIMIT

~
(B)

GROUND RETURN
TO STANDARD
TEST FIXTURE

CURRENT MODE
1414-3

Fig. 3-2. Step Amplifier block diagram (A) Voltage mode and (B) Current mode.

3-6

REV. B, FEB. 1975

Circuit Description-571-D1 or D2 Service
With a constant-voltage per step across the current
setting resistors, the current/step can be varied by changing
the resistance.

OFFSET MUL T AID button. The power supply used for
this opposite polarity output is either the + or - 30 volts to
R393, via relay K436.

To obtain voltage steps, the voltage setting resistors
(which compose the input resistance of the negative input)
are changed, thus varying the gain of the negative side of
the feedback amplifier, U380A.

The current provided by the + or - 30-volt supply is
limited by R393, which is the reverse current for voltage
and current modes and is normally set at about 15 mA with
zero volts out.

Voltage Mode. The output step amplifier in the voltage
mode is an inverting feedback amplifier. The input resistance consists of R 371 through R375 (the selectable
voltage setting resistors); the feedback resistance is R396.
With 400 mV steps in, the output steps range from 50 mV
to 2 V.

Current Mode. In current mode, the operation of the
amplifier is similar to voltage mode. The output voltage is
fed back to the + side of the differential amplifier (U380A),
provid ing a reference. I nput to pin 3 of U380A is always
through the voltage setting resistors, R371 through R375.
I n the current mode, the input resistance is set at 3.01 kil
for all positions of the STEP/OFFSET AMPL switch. When
the feedback resistance is R396 and R397 in parallel, the
gain of the amplifier is the feedback resistance (R 396 and
R397 in parallel) divided by the input resistance (3.01 kil)
for a gain of 0.5.

The + input of the inverting feedback amplifier, U380A,
is connected to the output of the + 1 amplifier (voltage
follower), 0450A and B, and U380B.

I n the voltage mode, the input to the + 1 amplifier is
connected to the ground return to the standard test fixture
(output voltage steps are referred to ground).

The output of U380A drives the base of either 0384 or
0386, depending on the setting of relay K436, which
determ ines the step polarity. In the - mode, 0386 is driven
by U380A output through the divider R381 and R382.
0386 collector is connected to the - side of the floating
power supply.

The + side of the floating power supply is connected to
the base of the device under test through a 1 il resistance.

The feedback path to the inverting-feedback amplifier is
from the output side of the current setting resistors,
through R396, the feedback resistor for the - side of the
amplifier.

Voltage divider, R381-R382, in conjunction with R387
(emitter of 0386-0384), sets the forward current limit in
the voltage mode. The divider limits the voltage that may
be applied to the base of 0384 or 0386.

Since the base voltage is limited, the voltage across R387
is limited, thus limiting the current through the deviceunder-test.

When the amplifier is in the + step polarity mode, it is
possible to achieve minus voltage output by using the

®

400 mV steps into the input resistor produces 200 mV
steps across the current setting resistors. The output of the
current-setting resistors is fed back through the +1 amplifier
(0450-U380B), via divider R456-R457-R459 to the input,
pin 2, of U380A. This arrangement produces a constant
200 mV across the current-setting resistors, regardless of
the voltage on the term inals of the device under test, up to
the voltage limit in current mode. Current out can be
changed by changing the value of the current-setting
resistor, R404 through R427, permitting current steps
ranging from 50 nA/DIV to 200 mA/DIV with STEP X.1
pushed in.
The output impedance adjustment, R456, permits the
divider ratio to be adjusted to exactly match the U380A
input divider ratio. This helps to ensure a 200 mV/Step
across the current-setting resistors (up to the voltage limit
in current model. regard less of the voltage on the term inals
of the device under test. Since the current-setting resistors
can be selected, current out can be varied by changing the
value of current-setting resistor.
C R438-CR439-CR440, and CR441, reverse-voltage
limiting diodes, are connected to 0436 and 0440 collectors. Either CR438 and CR441 or CR439 and CR440
determine the reverse voltage limit, depending on whether
0436 or 0440 is tu rned on.
If the step-amplifier polarity is +, 0436 is off and its
collector high and 0440 is on (saturated), with its collector
at a low level. In this condition, the junction of R457 and
R459 can go no more negative than two diode junctions,
plus a saturated transistor, for a voltage limit of about
-1.3 volts.

3-7

Circuit Oescription-577-01 or 02 Service
In the opposite polarity, 0436 is turned on (saturated)
and R457-R459 junction can go no more positive than
about +1.3 volts. With the voltage at this point limited to
about + 1.3 volts, either polarity, the voltage at the output
of the current-setting resistors is also limited. The 1.3 volts
at the input to the differential comparator corresponds to
about 2 volts at the output of the current-setting resistors.

The collector sweep dimming circuit is located on the
main circuit board and is a part of the step amplifier
schematic. Collector sweep dimming consists of 0594 and
its associated components. The input to the circuit arrives
via pin 1 of P596, from Tl02, the collector sweep
transformer. When the VARIABLE COLLECTOR % control is set at 100, the signal is 200 volts, POp. The signal is
rectified by CR591 and filtered by R591-R592-C591,and
applied to 0594 base.

Since 0594 is turned on by a very small signal, the
VARIABLE COLLECTOR % control need be turned only a
few degrees from zero to cause 0594 to saturate. When
0594 saturates, its collector approaches ground, which is
applied to pin 2 of P611 to disable the collector sweep
dimming. When no signal is applied to CR591 (when the
VARIABLE COLLECTOR % is turned to 0) 0594 is turned
off, its collector is positive, perm itting the collector sweep
dimming in the display module to operate, dimming the
display.
Collector sweep dimming can be disabled internally by
grounding pin 2 of P524 or externally by grounding pin 11
of J 110 (at the test fixture interface jack).

input. This step-generator signal arrives via the divider,
R511·R512 and is applied to the FET amplifier input in the
STEP GEN position of the HORIZ VOL TS/DIV switch.

Any of the signal sources must pass through the
POLARITY NORM-INVERT switch, which sets the horizontal amplifier polarity.

FET amplifier, 0514A and B, is a differential-input
source follower. The output of this follower is fed to the
inverting-feedback amplifier, U520, having a gain of +1.
U520 output is fed to another inverting-feedback amplifier,
having selectable input and feedback resistors.

The input resistance consists of R526, R524, and R523,
which make up the .5, 1 and 2 switching. In all the .5
positions of the HOR IZ VOL TS/DIV switch, contact 24 is
closed, paralleling R523 and R526. In the 1 positions of the
HORIZ VOL TS/DIV switch, contact 25 is closed and R524
and R525 are in parallel. I n the 2 positions of the HOR IZ
VOL TS/DIV switch, contacts 24 and 25 are open, leaving
only R526 as the input resistance.

The feedback resistors of U530 are R536 and R 537.
When this amplifier is in X 1 (X 10 HOR IZ MAG pushed in),
R536 is in parallel with R537. When X 10 HOR IZ MAG is
pulled out, R537 is the feedback resistor.

Pins 4 and 5 of P524 (pins 8-9 and J-K, P110) provide a
current source for automatic display positioning with
polarity change when using the 177 Standard Test Fixture.

Horizontal Amplifier
The horizontal amplifier consists of a voltage divider,
R502A, B, C, and 0; a FET amplifier, 0514A and B; a
feedback amplifier, U520; and an adjustable gain-inverting
feedback amplifier, U530. The output of this amplifier is
connected to the output amplifier in the display unit.

The input to the divider, R502, comes from pin 1, P508
(pin 4-PllO, 577-test fixture interface). The value of R502
is selected by S502, HOR IZ VOL TS/DIV. The signal is
applied to one end of the divider, R502. A selectable tap on
this divider is used to select the voltage applied to the FET
amplifier (0514A and B) input. The selectable tap is moved
by the HORIZ VOL TS/DIV switch and provides decade
switch ing. I n the most sensitive ranges, 50 mV, .1 and
.2 volts (in both collector volts and base volts ranges), R502
is out of the circuit and the signal goes through R501,
directly into the FET amplifier input.

The step-generator signal from pin 6 of U360 can bypass
both R501 and R502 and be fed to the FET amplifier

3-8

Vertical Amplifier
The vertical amplifier is a differential-chopper amplifier.
See Fig. 3-3. The amplifier is isolated and can float up to
2000 volts of common-mode Voltage.

The amplifier consists of floating +15 and -15-volt
power supplies and an oscillator and driver transistors to
drive the chopper transformer.

The floating power supplies consist of a winding on
power transformer, T701; a diode bridge, CR582; a filter,
C581; and two 15-volt Zeners, VR581 and VR582.
The chopper consists of U542A, B, C, 0, and E. The
driver transistors 0544 and 0546 drive the primary of
chopper transformer T550. T550 secondary terminals 7,8,
9, and 10 connect to FET switches 0552,0554,0556, and
0558. The FET switches drive signal-isolation transformer,
T560.

REV. B, FEB. 1975

Circuit Oescription-577-01 or 02 Service

500 kHz
SWITCHING
SIGNAL

T550

SWITCHING CIRCUIT
DIODE SWITCH
(SAMPLING BRIDGE)

I

FET
I
I SWITCHESI

I

I

:

I
I
I

I
I
I

~
FROM 177
VERTICAL PREAMP

__
21-c~ "

I

I

I

VERTICAL SIGNAL TO
VERTICAL AMP

'-______-e__~~P120
- - - - - - - - -. . . . TO OVERRANGE
CIRCUIT
(CR584)

I

I

I

J110

- - - , _ GROUND RETURN
TO STANDARD
TEST FIXTURE
T560

Fig. 3-3. Block diagram of the vertical amplifier.

T550 secondary feeds a sampling bridge, CR561,
CR562, CR563, and CR564; and an inverting-feedback
amplifier, U570.

The differential vertical signal comes to the two FET
pairs, 0552, 0554, 0556, and 0558, via pins 1 and 4 of
P 129. The common signal on pin 1 is connected to the
sources of 0556 and 0558, and the vertical signal (pin 4) is
connected to the sources of 0552 and 0554. The gates of
these FETs are controlled by the chopper transformer,
T550.

T550 is driven by a 500 kHz square wave that is
generated by the astable multi, U542, which drives 0544
and 0546. T550 secondaries drive the gates of the FET
pairs. Only one FET pair is turned on at one tirqe
(0552-0556 on or 0554-0558 on).

I n the zero-signal (on T550 secondary) condition, the
four FETS are conducting. When pin 7 of T550 is negative
with respect to pin 8, CR552 and CR553 are forward
biased, and 0552 turns off. At the same time, pin 9 is
negative with respect to pin 10, CR556 and CR557 are
forward biased, and 0556 turns off. Therefore, 0554 and

REV. B, FEB. 1975

0558 are conducting. The vertical signal from pins 1 and 4
of P129 are now passed through the conducting FETs,
0554 and 0558 to T560 primary. When the polarity at pins
7 and 8 and pins 9 and 10 reverse, 0554 and 0558 turn off
and the vertical signal from the test fixture is connected to
T560 primary in the opposite direction. This switching
occurs at a 500 kHz rate, as previously described.

Thus, the vertical signal is coupled through the signal
isolation transformer, T560, and appears at terminals 1 and
2. Pins 1 and 2 are connected to the diode bridge, CR561,
CR562, CR563 and CR564. The bridge is driven by a
winding on chopper transformer, T550. The diodes are
turned on half the time, drivel'! by the 500 kHz square
wave. This action connects T560 output (terminals 1 and 2)
across C565.

Filter L564-C564 helps to remove the 500 kHz component from the signal. Thus, the vertical signal is reconstructed across C565. The signal then goes through the
NORM-INVERT switch, which can invert the signal applied
to the inverting-feedback amplifier, U570. The input
resistance of U570 is R567 and R568. The feedback
resistance is the parallel total of R576 and R577 when X 10
VERT MAG is pushed in. When the Xl0 VERT MAG is

3-9

Circuit Oescription-577-01 or 02 Service
pulled out, R577 is the feedback resistance, changing the
gain by a factor of 10. A vertical filter, C568 and C569
(with protective diodes, CR568 and CR569), filters the ac
signal at U570 input. When this filter (DISPLAY FILTER)
is switched (S568) in, only very low frequency measurements can be made. Pin 2, U570, is the - input of the
inverting amplifier and has two signal sources other than
the signal through R567 and R568. These sources are: the
Vertical POSITION control, R575, and the automatic
positioning signal from the COLLECTOR SUPPLY
POLARITY switch.

The additional winding on T560 (terminals 4 and 6)
provides collector supply disable if the vertical signal is too
large. The signal at term inal 4 (T560) is related to the
vertical signal amplitude. This signal (terminal 4) is rectified
by CR584 and connected to 0586 base via R584. 0586 is
normally on (no·signal condition). If the signal amplitude is
large enough, 0586 starts to tu rn off. As 0586 starts to
turn off, the negative-going collector signal, coupled
through C587 back to 0586 base, creates a negative-going
ramp at 0586 collector 'as long as the signal amplitude is
high enough to attempt to turn 0586 off (because of the
Miller effect. If the ramp duration reaches approximately
150 ms (the level at R587-R588 junction reverse biases
0588), 0588 collector signal (positive-going) is coupled
back to 0586-R586, and turns 0586 off.

When 0588 collector goes positive, relay K125 (collector supply schematic) deactivates and disables the collector
supply. With the collector supply disabled, the signal on
terminal 4 of T560 is removed and the circuit reverts to its
quiescent state after C586 discharges through R586 and
R585 (0586 and 0588 on), and the collector supply,
th rough relay K 125 is enab led .

When the MAX PEAK POWER-WATTS switch is set at
.6 watts or below, 0588 base is grounded through R149,
disabl ing the collector sweep disable circuit by holding
0558 in conduction. This shut-down circuit protects the
current measuring resistors in the test fixture from excessive
power dissipation when the collector sweep is on the highpower ranges.

The MAX PEAK VOLTS switch permits a choice of five
collector sweep voltage ranges, choosing secondary transformer (Tl02) taps. These secondary voltages are rectified
by one of two diode bridges: CR107 for the 6.5 V, 25 V
and 100 V ranges and C R 103-4-5-6 for the 400 V and
1600 V ranges.

The polarity of the outputs is changed by reversing the
power supply output connections. When the COLLECTOR
SUPPL Y POLARITY is in either the +DC or -DC modes,
the MAX PEAK VOLTS switch selects one of three
resistor-capacitor combinations (connected between the
collector sweep output and the current-return input). The
capacitance holds the collector-sweep DC voltage at a
constant level, set by the VARIABLE COLLECTOR %
control, to produce a spot on the CRT, rather than a
sweeep. The shunt resistance discharges the capacitance
when the collector voltage is turned down.

Maximum peak current is set by R131 through R147, in
series with the collector sweep. These series resistors are
selected by the SERIES RESISTORS control (front panel).
If excessive power is drawn from the collector sweep
supply, circu it breaker S 101 opens, disabling the supply.

I nput power to Tl 0 1 (variable auto-transformer) is also
controlled by relay K125. Relay K125 is controlled by
several sources, via pin 4, P122, to the COLLECTOR
SUPPL Y POLARITY switch (S 120, which interrupts collector sweep supply between POLAR ITY switch positions),
and to 0588 collector. 0588, as explained previously, is
controlled from several points.

BLOCK DIAGRAM DESCRIPTION (D1 and D2)
The vertical and horizontal deflection amplifiers provide
final amplification for the signals from the 577 unit. They
produce push-pull outputs suitable to drive the CRT
vertical and horizontal deflection plates. Beam-finding
circuitry is incorporated to limit the display within the
screen area when the front-panel BEAM FINDER button is
pressed.

Collector Supply
The collector supply circuit produces: an unrectified
sine wave; a full-wave rectified sine wave; or a capacitorfiltered full-wave rectified sine wave, with peak amplitudes
that can be varied from zero to 1600 volts, peak, in five
ranges.
The voltage for the collector supply is provided by a
variable autotransformer, Tl0l. Tl0l output is connected
to sweep transformer (T102) primary and varies from zero
to approximately 110 volts.

3-10

The CRT Circuit produces the high voltage (about
-3.4 kilovolts) and contains the controls necessary for
operation of the cathode-ray tube. The CRT Circuit also
contains the Z-Axis amplifier, which provides the drive
signal to control the intensity level of the display.

The Storage Circuit provides the voltage levels necessary
to operate the storage elements associated with the CRT.
The circu it includes the erase-pulse generator for erasing

REV. B, FEB. 1975

Circuit Description-577-Dl or D2 Service
stored information and a multivibrator that permits the
flood-gun duty cycle to be varied.

of the floating CRT grid supply without excessive power
dissipation in 01226. The output voltage provides the drjve
signal to control the CRT intensity level through the
Control-Grid supply.

CIRCUIT DESCRIPTION (D1 and D2)
Deflection Amplifiers
Vertical Deflection Amplifier. The Vertical Amplifier
provides the final amplification of signals applied from the
577. It produces a push-pull output sufficient to drive the
CRT vertical deflection plates. The amplifier consists of
01106, 01107, 01116, 01117, and associated circuitry.

The input signal arrives via P612 via the interface circuit
from the 577. The output signal is developed across the
collector load resistors, R 1104 and R 1114, and is about 50
times the magnitude of the input signal. R 1116, Vert Gain,
provides 01106-01116 emitter degeneration to set the gain
of the stage to provide a calibrated vertical display.

Horizontal Deflection Amplifier. The Horizontal Deflection Amplifier consists of 01126, 01127, 01136, 01137,
and associated circuitry. It is basically the same as the
Vertical Deflection Amplifier just described, and provides
the amplification of signals from the 577. Signals from the
577 are applied via P611. Gain of the stage is set by R 1136
(Horiz Gain) to provide a calibrated horizontal display.

Beam Finder. If a high-amplitude signal or a misadjusted
control has deflected the trace or display off screen, it can
be located by pressing the front-panel BEAM FINDER
pushbutton. This opens Sl125, permitting current to pass
through R 1125 into the em itter circuits of both deflection
amplifiers. Rl125 limits the current available to the
transistors, and hence, to the collector-load resistors. Thus,
the dynamic range of the deflection plates is limited to an
on-screen level, and the display is compressed within the
viewing area.

CRT Circuit

The output level of the Z-Axis Amplifier is established
by the voltage drop across R1227 with reference to virtual
ground at the base of 01222 (the operational amplifier
summing point). The current through R 1227 is determined
by the input current from any combination of several
sources, such as from the front-panel INTENSITY control,
test fixture interface (blanking, intensification, etc.), and
from 01214. 01214 is a common-emitter amplifier which
acts as a switch. 01214 is normally on and is turned off
whenever the Brightness multivibrator turns off the flood
guns. This, in turn, blanks the CRT to prevent an incorrect
deflection factor being shown.

High Voltage Regulator
High Voltage Primary. A repetitive, non-sinusoidal signal
is produced by a phase- modulated switching circuit in the
primary of T1240 and induced into the secondaries.
Current drive for the primary wind ing is furnished by
01252 in its conducting state. 01252 is turned on by
positive-going feedback applied through C 1259 and L 1259
from the feedback winding, then turned off by switching
action from 01262. A sample of the output DC voltage is
modulated by the AC from another feedback winding at
the gate of 01278; this establishes the conduction time of
01252 and thus maintains the proper output level. 01252
delivers energy to T1240 only once each cycle.

Assuming 01262 and 01264 are initially off, R 1262
provides base drive for 01252, causing it to deliver current
to T1240 primary. As 01252 conducts, the increasing
current through the primary winding induces a voltage into
the secondaries. The gate of 01278 is driven negative by
the voltage from the feedback winding, switching 01264
and 01262 on. With conduction of 01262, base drive for
01252 is removed.

General. The CRT Circuit produces the high-voltage and
provides the control circuits necessary for operation of the
cathode-ray tube (CRT). This circuit also includes the
Z-Axis Amplifier stage to set the intensity of the CRT
display.

With 01252 off, the transformer field collapses, reversing the polarity of the voltage induced into the secondaries.
When the gate of 01278 is driven sufficiently positive to
switch 01264 and 01262 off, 01252 is switched on again.
01252 again delivers energy to the primary winding and the
action is repeated.

Z-Axis Amplifier. The Z-Axis Amplifier is a currentdriven, shunt-feedback, operational amplifier with a voltage
output, consisting of 01222, 01226, and 01234. The
feedback path is from the collectors of 01226 and 01234
through R1227-C1227 to the base of 01222. 0123.4 is a
constant-current source to provide drive for the capacitance

High Voltage Regulation. Regulation is accomplished as
follows: Feedback from the -3400-volt cathode supply is
summed with +30 volts through the voltage divider consisting of resistors R1272B-E, R1275, and R1276 to establish
the DC level at the gate of 01278. The ac component,
which is the switching signal, is derived from the trans-

REV. B, MAY, 1977

3-11

Circuit Oescription-577-01 or 02 Service
former as described previously. If the output level of the
cathode supply drops below the nominal -3400 volts
(becomes more positive), the level at the gate of Q1278
rises. A new point is selected on the varying ac component
to cause switching of Q1262·Q1264 later and hence
increase conduction time of Q1252. This allows more
energy to be delivered to the primary winding of T1240,
resulting in an increase of voltage in the secondaries.
Conversely, if the output level increases, Q 1252 is allowed
to conduct for a shorter length of time. The OC level at the
gate of Q1278 is adjusted by R1275, H.V. Adj., to set the
output at exactly -3400 volts.

High Voltage Outputs
Transformer T1240 has two high-voltage output windings which provide the potentials required for the CRT
cathode and control grid supplies. The -3400-volt accelerating potential for the cathode is supplied by half-wave
rectifier CR 1247. The cathode heater is elevated to the
cathode potential through R 1273.

Half-wave rectifier CR 1241 provides about -3450 volts
to establish bias voltage on the CRT control grid. This
voltage (and hence the CRT beam current) is dynamically
controlled by the Z-Axis Amplifier, which contains the
INTENSITY control, blanking inputs, and intensification
inputs. R 1245, Int Range, provides a fine adjustment of the
quiescent grid voltage to bias the CRT just below cutoff
when the Z-Axis Amplifier output is at its minimum
quiescent level (INTENSITY control counterclockwise and
no intensifying or blanking inputs).

Neon bulbs OS1271, OS1272, and OS1273 provide
protection to the CRT if the voltage difference between the
control grid and the cathode exceeds about 180 volts.

CRT Control Circuits
In addition to the INTENSITY control discussed previously, front-panel FOCUS and internal astigmatism controls have been incorporated for arriving at an optimum
CRT display. FOCUS control R 1295 provides the correct
voltage for the second anode in the CRT. Proper voltage for
the th ird anode is obtained by adjusting Astig control
R 1286. I n order to obtain optimum spot size and shape,
both the FOCUS and Astig controls are adjusted to provide
the proper electrostatic lens configuration in the CRT.

The Geom adjustment R 1285 varies the positive level on
the horizontal deflection plate sh ields to control the overall
geometry of the display. The TRACE ROTATION control,
R1291 permits adjustment of the OC current through
beam-rotation coil L 1291 to align the display with the
graticule lines.

3-12

Storage Circuit (D1 only)
General. The CRT used in the 01 is a direct-view
bistable storage cathode-ray tube with a split-screen viewing
area that permits each half to be operated individually for
stored displays. Only those elements associated with the
storage capability of the CRT are shown in the CRT
enclosure on the right side of the Storage Circuit schematic
diagram. The writing gun, its deflection systems and
associated elements have been discussed previously under
CRT circuit.

Storage Operation. Four low-energy electron guns (flood
guns) provide full coverage of the large screen area. Each
consists of a heated cathode and an anode. The cathode
heaters, which receive an unfiltered pulsating OC from
full-wave rectifier CR 1329, are elevated to -30 volts
(cathode potential) through R 1329. Quiescently, Q1308 is
saturated, providing current to the flood-gun cathodes. The
anode potential is established by VR 1396 and supplied via
emitter follower Q1396.
The collimation electrode is a metallic band around the
inner wall of the CRT envelope. It produces an electrostatic
field to distribute the flood-gun electrons uniformly over
the storage target. R 1390, CE 1, provides adjustment of the
flood electron trajectories to cover the extreme rim of the
targets and optim ize uniform ity of the target coverage.
Emitter follower Q1392 maintains a stable voltage on the
collimation electrode, providing a low-impedance current
path to absorb current variations.

The storage screen consists of a thin tin oxide layer
called the target backplate, which is coated with an
insulator material containing finely-ground phosphor particles called the target. A positive voltage is applied via
Q1372, S1372, and S1375 to the backplate to establish the
operating level of the tube, which is the difference in
potential between the backplate and the flood-gun cathodes. The CRT screen area isdivided into two halves, which
are electrically insulated from each other to perm it independent operation.

The target operates in a bistable mode because of the
secondary-emission properties of the insulator material. The
first stab Ie state is the rest potential, at wh ich the target has
gathered low-energy flood-gun electrons, causing it to
charge down to the flood-gun cathode potential. The
second stable state is the stored state, at which the target
(or portions of it) is sh ifted to the backplate potential by
increasing the secondary emission. Although the flood guns
do not have sufficient energy to shift the target to the
stored state, they do supply sufficient energy to hold the
target in the stored state after it has been shifted by the
high-energy writing-gun beam (CRT beam). This is because
the land ing energy of the flood electrons has increased with
the increased potential difference between the flood-gun

REV. B, FEB. 1975

Circuit Oescription-571-01 or 02 Service
cathode and the target. These higher energy electrons
produce a visual display as long as the flood gun beam
covers the target.
When the stored display is no longer needed, the
information is erased by first shifting the entire target to
the stored state, then removing the charge. A positive-going
short-duration pulse is first applied to the backplate,
increasing the flood.gun electron landing energy and writing
the entire target area. Next, the backplate voltage is pulled
well below the rest potential of the target, wh ich follows
due to its inherent capacitive coupling. Then, as the
backplate is gradually returned to its quiescent potential,
the target charges to the rest potential and is ready to write
again.

Backplate Supply. A regulated +370 volt DC power
supply is incorporated in the Storage Circuit to provide the
storage level for the CRT and to ensure a potential
sufficient for the erasure process. A wind ing of the
high-voltage transformer T1240 supplies 400 volts RMS,
which is rectified by CR 1386. 01386 and Q1388 are
connected as a feedback pair to provide the regulated
+370-voh DC output. VR 1388 establishes the reference
voltage, and R 1387, +370 V Adj., sets the current through
01386 to set the output level. V R 1387 is a protection
device for the transistors, and is normally operated in a
region of its characteristic curve below its Zener knee.

Backplate Control. Separate STORE switches, S1375A
and S1375B, are provided for the target backplates to
perm it each storage screen to be operated ind ivid ually. In
the store mode, the store-level potential for the backplate is
supplied by either 01372 or by the erase-generator output
operational amplifier, depending upon the setting of the
ERASE SELECT switches, S1372A and B.

Target backplate control is 'precisely maintained by a
feedback amplifier system consisting of 01356, 01358,
01362, and 01364. The operational amplifier summing
point is the base of 01356 and the feedback resistor is
R 1355. Variable resistor R 1350, Store Level, provides an
adjustment of the current to the null point and hence, sets
the backplate voltage through R 1355 to an optimum
storage level. R1370, Store Bal, permits matching the
backplate voltages for uniform screen luminance, whether
they are selected for erasure or not. When either or both
screens are operated in the store mode, the divider network
in the high-voltage regu lator circu it is mod ified to sh ift the
high voltage sl ightly, correcting for the deflection sensitivity changes that occur. The backplate voltage is applied
through either R1381 or R1382 to the base of 01384
removing the ground potential from the 01384 collector:
R1385, Sense Correct, permits an adjustable sensitivity
correction voltage to be applied to the high-voltage regulator ..

REV. B. FEB. 1975

Erase Generator. The previously discussed operational
amplifier is driven by a monostable multivibrator when it is
desired to erase a stored display. The ml"tivibrator consists
of 01334, which is normally on, and 01336, which is
normally off. When E RASE button S 1330 is pressed,
R 1330 is grounded, producing a negative-going step
through C1331 to cut 01334 off. 01336 turns on, and the
negative-going step produced at its collector causes a
corresponding positive-going step at the output of the
operational aniplifier. This positive-going step is applied to
the target backplate, increasing the storage level and
"writing" the entire target.

After an RC-controlled time of 10 milliseconds, the
multivibrator reverts to its quiescent state, producing a
positive.going step at the collector of 01336 as the
transistor turns off. This positive-going step is coupled
through C1342, and the backplate is pulled negative
through the action of the operational amplifier. The target
is pulled well below its rest potential. As C 1342 charges,
the voltage at the cathode of C R1343 decays from about
+20 volts toward the -30-volt supply at an RC-controlled
rate until it is clamped at ground by conduction of
CR1343. This action allows the target backplate to be
raised slowly to its operating level, while the target remains
at the flood-gun cathode potential. The total time from
initiation of erasure to the ready-to-write cond ition is about
250 milliseconds.

Flood-Gun Cathode Control. As previously mentioned,
01308 provides the current for the flood-gun cathodes, It
operates at saturation, establishing a cathode potential of
nearly -30 volts. 01308 is controlled by a transistor switch
activated by the sweep gate, and also by a multivibrator.
While the sweep is running, 01304 overrides the multivibrator output and holds 01308 in its conduction state.
Emitter follower 01302 receives the sweep blanking input
from R1203 in the Z-Axis Amplifier circuit; however, the
level of interest is the zero volts applied to the base of
01302 while the sweep is running. This level permits the
base of 01304 to move slightly negative, biasing the
transistor into saturation and ground ing the collector of
01320. Through R1307-R 1308 divider action, 01308 is
held on.

When the collector sweep is turned down, the +5 volt
collector sweep dimming level is applied to 01302, raising
its emitter positive. This level switches 01304 off, releasing
its hold on 01308. In this condition, 01308 is controlled
by collector-coupled multivibrator 01310-01320. When
01320 conducts, 01308 conducts. Symmetry of the
multivibrator is controlled by R1313 and R1325. R1325,
BRIGHTNESS, is adjustable to allow 01320 to conduct
anywhere from 10% to 100% of the time. Thus the duty
cycle of the flood-gun cathodes can be varied from 10% to
100%, which has the effect of varying the stored brightness.

3-13

Section 4-577-01 or 02 Service

MAINTENANCE
Introduction
This section of the manual contains information for use
in preventive and corrective maintenance with some aids to
troubleshooting.
WARNING

I

Lethal voltages are present in many areas within the
instrument. Be particularly careful near the power
transformer, since lethal voltages can exist on the
transformer terminals even with the MAX PEAK
VOL TS switch on low range, unless the VARIABLE
COLLECTOR % control is set to O. The Col/ector
Sweep circuit board and the HOR IZ VOL TS/DIV
switch can also be at lethal voltage levels if the
VARIABLE COLLECTOR % control is not at O.

Avoid the use of chemical cleaning agents that might
damage the plastics used in the instrument. Do not
use chemicals that contain benzene, toluene, xylene,
acetone, or similar solvents.

Lubrication
The reliability of potentiometers, rotary switches, and
other moving parts can be maintained if they are kept
properly lubricated. Use a cleaning-type lubricant on rotary
switch contacts. Lubricate switch detents with heavier
grease (such as Tektronix Part No. 006-0219-00).

NOTE

PREVENTIVE MAINTENANCE
General
Preventive maintenance consists of cleaning, visual inspection, lubrication, etc. Preventive maintenance performed on a regular basis improves instrument reliability.
The severity of the environment in wh ich the instrument is
used determines the frequency of maintenance.

Cleaning
The 577 Curve Tracer system should be cleaned as often
as operating conditions require. Accumulation of dirt in the
instrument can cause overheating and component breakdown. Dirt on components acts an an insulating blanket,
preventing efficient heat dissipation. Dirt, in a ,humid
atmosphere, can also furnish a conducting path.

Exterior. Loose dust accumulated on the outside of the
instrument can be removed with a soft cloth or a small
paint brush. The paint brush is particularly useful for
dislodging loose dust on and around the front-panel
controls. Dirt that remains can be removed with a soft cloth
dampened in a mild detergent and water solution. Abrasive
cleaners should be avoided.
Interior. Dust in the interior of the instrument should be
removed occasionally to prevent electrical conduction in
high-humidity environments. Blowout accumulated dust
using dry, low-velocity air. Remove any remaing dirt with a
mild detergent and water solution. A cotton-tipped applicator is useful for cleaning circuit boards.

REV C MAY 1980

Do not lubricate cam switch contacts. Shaft bushings
and potentiometers that are not sealed should be
lubricated with a lubricant (such as Tektronix Part
No. 006-2574-00) that will not affect the electrical
characteristics. Do not over-lubricate. A lubrication
kit (Tektronix Part No. 003-0342-02) is available.

Visual Inspection
The 577 and associated modules should be inspected
occasionally for such defects as broken connections, loose
pin connections, improperly seated transistors, damaged
circuit boards, and heat damaged parts.

The corrective procedure for most visible defects is
obvious. However, particular care must be taken if heat
damaged components are found. Overheating usually indicates other trouble in the instrument. It is, therefore,
important that the cause of overheating be corrected to
prevent recurrence of the damage.

Transistors and Integrated Circuits
Periodic checks of individual transistors and integrated
circuits are not recommended. The best check is their
operation in the equipment as reflected by performance.
Sub-standard performance is normally detected during a
performance check or calibration procedure.

4-1

Maintenance-571-01 or 02 Service

Recal ibration
To ensure accurate measurements, check the instrument
calibration after each 1000 hours (approximately) of
operation, or if the instrument is used infrequently, every
year. Replacement of components may necessitate recalibration of the affected circuits. Complete calibration
instructions are given in the Performance Check/
Adjustment section of the appropriate test fixture manual.
The Performance Check/Adjustment procedure can also be
helpful in locating troubles.

TROUBLESHOOTING
Introduction
The following information is provided to facilitate
troubleshooting the 577-01 or 02 Curve Tracer system.
Information contained in other sections of this manual
should be used with the following information to aid in
locating circuit defects (see the Operating and Circuit
Description sections).

Troubleshooting Equipment
The following equipment is useful for troubleshooting
the 577-01 or 02 Curve Tracer system:
1. Semiconductor Test. Some means of testing the
transistors, diodes, and FETs used in the instrument is
helpful. A curve tracer such as the Tektronix 575, 576, or
577 gives the most complete info~mation.

2. DC Voltmeter and Ohmmeter. A voltmeter for
checking circuit voltages and an ohmmeter for checking
resistors and diodes are required. For most applications a
20,000 ohms/volt VOM can be used if allowances are made
for circuit loading when measuring voltage at high impedance points.

trical value of each component are shown. See the first page
of the Diagrams section for definition of the symbols used
to identify components.
Important voltages and waveforms are shown in blue on
the diagrams. Portions of the circuits mounted on circuit
boards are enclosed by blue lines or boxes.

Diode Color Code. The cathode end of each glass
enclosed diode is indicated by a stripe, a series of stripes, or
a dot. For diodes using a series of stripes, the color code
identifies either the Tektronix part number or the JEDEC
number. This code follows the standard color code except
that a pink first band indicates a Tektronix part number,
i.e., pink-orange-red-yellow is Tektronix Part Number
152-0324-00.

The cathode and anode of metal-case diodes can be
identified by the diode symbol marked on the diode body.

Circuit Boards. A photograph of each circuit board, with
circuit components identified, is included on the apron of
the schematic diagram most directly relating to the circuit
board. Some board photos may be placed on the back of
the preceding circuit diagram. Each circuit board photo is
sectioned by a grid system to facilitate rapid location of
components by component number.

Switch Wafer Identification. Rotary switch wafers
shown on the diagrams are coded to indicate the position of
each wafer in the switch assembly. The number portion of
the code is the wafer number, counting from the mounting
end of the switch. The F and R indicate whether the front
or rear of the wafer performs the switching function. For
example, a wafer designated 2R indicates the rear of the
second wafer.

3. Test Oscilloscope. A test oscilloscope is necessary to
view circuit waveforms. An oscilloscope with a DC to
10 MHz frequency response and 1 mV/Div to 10V/Div
vertical deflection factor is suggested. A 10X probe should
be used to minimize circuit loading.

Circuit Description. The Circuit Description, Section 3,
describes each circuit. The section contains a brief description of the theory of circuit operation illustrated by a block
diagram of each section of circuitry. Following the Block
Diagram description is a detailed description of each circuit
that contains unique or complex circuitry.

Troubleshooting Aids

Transistor and Integrated Circuit Lead Configuration.
The lead configuration of the transistors and ICs in the 577
Curve Tracer system is shown with the circuit board photos
on the schematic foldout aprons.

Diagrams. Circuit diagrams are given on foldout pages in
the Diagrams section. The component number and elec-

4-2

®

Maintenance-577-01 or 02 Service
Power Supply Voltage and Ripple. Table 4-1 lists the
voltage tolerances of the power supplies in the 577. If the
supply voltage is with in the listed tolerance, the supply can
be assumed to be operating properly. I f outside the
tolerances, the supply may be misadjusted or operating
incorrectly. See Fig. 4-1 for power transformer line-voltage
taps.

TABLE 4_11
Supply

Voltage
Accuracy

Ripple

+200 V
+30 V2

Unregulated
Adjust to within
0.25% or less
Within 5%
Within 5%
Within 5%
Adjust to within
0.25% or less

4 V POp, or less, full load
10 mV, Pop, or less,
full load
10 mV
10 mV
10 mV
10 mV, Pop, or less,
full load

+12
+5
-12
-30

V3
V3
V
V2

c. Remove the two screws on the right, inside the
plug-in test fixture compartment.

d_ Remove the side rail.

5. Remove the multi-pin lead connector. The plastic
body is color-coded to the P number (with the exception of
leads originating in the display unit). The color code
follows the familiar resistor color code. The last digit of the
P number indicates the connector body color.

6. Remove the machine screws securing the flat-pack
transistors, 0384 and 0386, to the panel at the rear of the
circuit board.

7. Note the insulating, heat-conducting washer between
the transistor and the panel.

8. Remove the four machine screws securing the circuit
board to the chassis.

CIRCUIT BOARD REMOVAL
AND REPLACEMENT

9. Pull the rear of the circuit board out toward the side
of the instrument and then slide the circuit board to the
rear to remove.

Removal of Main Circuit Board
1. Note the position of the STEP/OFFSET AMPL and
HORIZ VOL TS/DIV switches. Loosen the set screws and
remove the knobs.

Replacing the Main Circuit Board

2. Remove the hex nuts from the through-panel bushings and remove the bushings from the front panel.

2. Place the two hex panel-bushing nuts over the
cam-switch shafts.

3. Place all pushbuttons in the out position.

4. Referring to Fig. 4-2, remove the right-side rail as
follows:
a. Remove the four machine screws from the bottom
of the rail.

b. Remove the screw from the lower-left corner of
the rear panel.

1 With

test fixture removed.

be within 1/2% of 30 volts. +30 and -3D-volt supplies must
be within 1/2% of each other.

2 Must

3+5 V and +12 V supplies can be loaded individually to 675 rnA,
but the total load on the two supplies should not exceed 800 rnA.

®

1. Stand the instrument upright on the rear end.

3. Slide the cam-switch shafts through the front-panel
holes (pushbuttons must be aligned with the plastic guide
bushings before the circuit board can be moved to its
permanent position).

4. Align the pushbuttons with the front-panel holes by
reaching through with a device that will not damage the
plastic buttons (for example, a cotton-tipped applicator or
a slender rubber-tipped rod) while carefully sliding the
circuit board toward the front panel.

5. Start the rear circuit board securing screw but do not
tighten.
6. Push the through-panel bushings through the front
panel around the switch shafts. Place the hex nuts on the
bushings and tighten.

4-3

Maintenance-577-01 or 02 Service

LINE-VOLTAGE SELECTOR ACCESS
Remove four machine screws from the corners of
power-supply chassis_ Swing right-end of chassis
away from instrument_ Chassis hinges on interconnecting wires_

SELECTING LINE VOLTAGE
Use brown connector for 110-volt nominal line
(red for 220-volt line)_ To select voltage within
nominal range, place connector on appropriate set
of pins for high (H), medium (M), or low (L) line
voltage. See table below_ See fuse size information
on rear panel, near fuseholder_

LINE VOLTAGE SELECTOR

H

M
L

BROWN
CONNECTOR

RED
CONNECTOR

120 V
110 V
100 V

240 V
220 V
200 V

Fig. 4-1_ Power transformer line-voltage taps.

4-4

REV . JUNE 1974

®I

Maintenance-571-01 or 02 Service

Fig.4-2 . Re mova I of right-side rail.

®

4-5

Maintenance-577-01 or 02 Service
7. Coat both sides of the insulating washers with
silicone grease and assemble tbe washers and transistors to
the panel with the mach ine screws, but do not tighten.

8. Place the four circuit-board screws and tighten.
9. Tighten the screws securing the transistors to the
panel.

10. Replace the circu it-board connectors.

200 with the knob skirt lamp. If the 200 is positioned to
illuminate all three digits, the alignment should be correct
for all other positions.

Removal of Collector Sweep Board
I WARNING

I

Do not attempt to remove any leads or screws with
the instrument power turned on. Allow a minute
after turning power off to allow capacitors to
discharge.

11. Replace the knobs in the original positions.
1. Remove the left side rail from the instrument as
detailed for the right-side rail removal.

Replacing the Side Rail
1. Put the rail in place and place the four screws
through the bottom panel into the side rail, but do not
tighten.

2. Unsolder the five wires from the circuit board. Note
the position of the two red and one yellow leads.

3. Remove the multiple-lead connectors.
2. Place the screw through the rear panel into the side
rail and tighten.

4. Remove the six board screws and remove the circuit
board.

3. Place the two screws in the plug-in test-fixture
compartment, but do not tighten.

Access to Power Supply Circuit Board
4. Slide the test fixture into the test fixture compartment. Adjust the side rail to permit the test fixture to slide
freely, without excess side clearance.

5. Tighten the four bottom-panel screws. Note that the
front screw is shorter than the remaining three. If a long
screw is placed in the front hole, the test fixture cannot be
removed after the bottom screws are tightened.

6. Remove the test fixture and tighten the two screws in
the test fixture compartment.

7. Replace the STEP/OFFSET AMPL and HOR IZ
VOL TS/D IV knobs in their correct positions.

8. Connect the instrument to the power line and turn
the instrument power on.

9. Check the positions of the STEP/OFFSET AMPL and
HORIZ VOL TS/DIV with the STEP X.1 and Horizontal
POSITION controls pushed to the in position and both
knobs turned to the 200 position. Check for alignment at

4-6

Remove the four corner screws (rear panel) from the
power supply chassis and swing the right side of the chassis
away from the instrument (the chassis will hinge on the
interconnecting leads).

NOTE

The power supply should be operated in the open
position only with the 177 Test Fixture. Use of a test
fixture other than the 177 can possibly use more
power than the power supply can dissipate with the
chassis away from the mainframe.

Removal of the Power Supply Circuit Board
1. Remove the mach ine screws that fasten U722, U732,
0766, and 0788 to the chassis. Note the insulating,
heat-conducting washers between the chassis and U732,
0788, and 0766.

2. Remove the multipin connectors and unsolder the
leads that are soldered to the circuit board. Note the wire
colors and positions.

REV. B, FEB. 1975

Maintenance-577-01 or 02 Service
3. Remove the six machine screws that secure the board
to the chassis.

2. Remove the two screws (one at each end) from the
ends of the connector. Note the position of the washers
between the connector and the chassis.

MISCELLANEOUS
Max Peak Volts-Series Resistors Knob Alignment
1. If removal and replacement of this switch is neces·
sary, turn the MAX PEAK VOLTS switch to 6.5 and the
SERIES RESISTORS knob to .12 and remove the knobs.

2. Set the replacement switches fully counterclockwise
(both sections against the stops).

3. Pull the connector forward far enough to gain access
to the soldered terminals on the rear of the connector.

4. Note the wire colors and positions and unsolder all
leads.

Replacement of 577-Test Fixture Interface Connector

3. Mount the MAX PEAK VOLTS knob to the shaft
and tighten the set screw enough to permit the shaft to turn
with the knob.

1. Solder all leads to the connector and push the connector toward the opening.

4. Switch to the 100 position and align the white arrow
with the second digit in the 100. Tighten the set screw.

2. Push the mounting screws through the panel holes
and mount the washers, (a piece of masking tape over one
or both of the screw heads to hold them in place may make
the task a bit easier).

5. Place the SERIES RESISTORS knob on the shaft
and tighten the set screw enough to permit the shaft to turn
with the knob.

6. Switch to the 120 position and align the black arrow
with the second digit (2) in the 120 (pull knob to switch to
the 120 position). Tighten the set screw.

Removal of Display Unit from Mainframe
1. Remove all multi-pin connectors (display unit to 577
mainframe leads).

3. Place the connector over the mounting screws and
replace the plastic guides.

4. Hold the guide blocks snugly in place while tightening the screws.

5. After assembly is completed, check to determine that
the connector assembly floats on its mountings (the
connector must float for proper mating with the test
fixture).

Repackaging for Shipment
2. Remove the shield from the display unit high-voltage
compartment (3 screws).

3. Remove the two screws that secure the rear of the
display unit to the 577 mainframe. The screws are
accessible from the top of the display unit.

4. Remove the two hex-head machine screws that secure
the front· of the display unit to the 577 mainframe
(accessible from the underside of the display unit).

5. Remove the display unit.

Removal of 577-Test Fixture Interface Connector
1. Remove the instrument bottom panel, (four machine
screws on each edge). Note that the two front screws are
shorter than the remaining six screws.

REV. B, MAY, 1977

If the Tektronix instrument is to be shipped to a Tektronix
Service Center for service or repair, attach a tag showing:
owner (with address) and the name of an individual at your
firm that can be contacted, complete instrument serial
number .and a description of the service required.
Save and re-use the package in which your instrument was
shipped. If the original packaging is unfit for use or not
available, repackage the instrument as follows:
Surround the instrument with polyethylene sheeting to
protect the finish of the instrument. Obtain a carton of
corrugated cardboard of the correct carton strength and
having inside dimensions of no less than six inches more
than the instrument dimensions. Cushion the instrument
by tightly packing three inches of dunnage or urethane
foam between carton and instrument, on all sides. Seal
carton with shipping tape or industrial stapler.
The carton test strength for your instrument is 375 pounds.

4-7

Section 5-577-01 or 02 Service

CHECK AND ADJUSTMENT PROCEDURE
Introduction

7. Resistors as follows: see footnote 1.

This section of the manual contains separate check and
adjustment procedures. The Check procedure is provided to
check the instrument operation against the instrument
specifications. The adjustment procedure returns the circuitry to within the design capabilities. Adjustment is
generally required after a repair has been made, or after a
long time interval in which normal aging of components
may affect instrument accuracy.

8. Extender cable, (to permit making adjustments to
the test fixture without removing the 577 bottom panel)
Tektronix Part Number 067·0721-00.
Quantity

Value

Watts

Tolerance

1
1
1
2
1
1
1
1
1

1n
10n
100n
200n
1 kn
10 kn
100 kn
1Mn
10Mn

10
5
1/2
10
1/4
1/4
1/8
1/8
1/8

1/4%
1/4%
1/4%
1%
1/4%
1/4%
1/4%
1/4%
1/4%

For initial inspection, using the check procedure, leave
the instrument side covers in place.

Services Available
Tektronix, Inc. provides complete instrument repair and
calibration service at local field service centers and field
offices. Contact your local Tektronix Field Office or
representative for further information.

SHOR~FORMPERFORMANCECHECK

PROCEDURE
Prelim inary

Test Equipment Required

1. Check CRT Operation

The following test equipment, or equivalent, is required
for complete check and adjustment of the 577 -D 1 or
577-D2 Curve Tracer. All test equipment is assumed to be
correctly calibrated and operating within the listed specifications.

Page 5-4

INTENSITY
CHECK-A spot should appear within the graticule area
(with the BEAM FINDER button held in) as INTENSITY
control is turned clockwise.
FOCUS

1. DC Voltmeter. Accuracy, 3%, full scale; voltage
range, -3400 volts to +310 volts. Example: the Simpson
Model 262 VOM.

Set FOCUS control for the smallest spot while reducing
the spot intensity.

2. Digital DC Voltmeter (4-1/2 digits) or a DC voltage
bridge. Input impedance, 500 Mn (see footnote 3,
Table 5-9); Accuracy, 0.01%; voltage range, -30 volts to
+1000 volts.

A focused, high-intenity spot can burn the CRT
phosphor.

~
TRACE ROTATION

3. Tektronix 177 Standard Test Fixture.

4. Capacitor. Capacitance, 0.01 J.lF; working voltage,
1000; tolerance, ±20%.

CHECK-Horizontal trace must be parallel to the center
horizontal graticule line (adjustment on rear panel).
GEOMETRY

5. Capacitor. Capacitance, 0.1 J.lF; working voltage, 100;
tolerance, ±20%.

CHECK-Bowing should not exceed 0.1 division over the
eight vertical or ten horizontal divisions.

6. Resistor. Resistance, 15 kn; watts, 1/4; tolerance,
10%.

lThese resistors are available as a kit from Tektronix, Inc. Order
Part Number 067-0691·00.

®I

REV. JUNE 1974

5-1

Performance Check-577-D1 or 02 Service
2. Check Beam Finder

Page 5-4

CHECK-The spot cannot be positioned out of the
graticule area with the BEAM FINDER button held in.

3. Check Trace Dimming

Page 5-5

CHECK-The spot should dim noticeably or disappear
when the VAR IABLE COLLECTOR % control is turned to

O.
4. Check Storage Operation

11. Check Max Peak Current and Circuit
Breaker Operation

CHECK-Vertical display should indicate >20 A.

CH ECK- The COLLECTOR SUPPLY
BREAKER should open within two minutes.

CIRCUIT

CHECK-The COLLECTOR SUPPLY
BREAKER can be reset within one minute.

CIRCUIT

Page 5-5

CHECK-The screen should have a uniform bright glow,
with top and sides pulled in (top pulled down about 1/2
major division).

CHECK-The eleven displayed vertical traces should be
uniform in appearance from top to bottom with all lines
similar in appearance.

CH EC K- The COLLECTOR SUPPLY CIRCUIT
BREAKER should not open with 10 A of collector current.

CHECK-The peak current for each setting of the MAX
PEAK VOLTS switch should be as shown in Table 5·5.

12. Check Collector Supply Interlock
CHECK-Stored display should dim when the BRIGHTNESS control is turned counterclockwise.

5. Check Horizontal Amplifier Balance

Page 5-6

CHECK-Spot movement should not exceed 0.5 major
division while switching between 5 V/DIV and 2 V/DIV,
COLLECTOR.

6. Check Horizontal Gain

Page 5-6

CHECK-500 mV should produce 10 divisions, within
2.5% (±0.25 major division), of horizontal deflection.

7. Check Horizontal Magnifier

Page 5-6

CHECK-50 mV should produce a horizontal deflection
of 10 divisions, within ±3% (±0.3 major divisions).

8. Check Horizontal Display Accuracy

Page 5-9

Page 5-6

CHECK-Horizontal deflection should be 10 divisions,
±3% (±0.3 divisions) as in Tables 5-2 and 5-3.

Page 5-9

CHECK-The yellow COLLECTOR SUPPLY DISABLED lamp lights when the protective box cover is open.

CHECK-The yellow lamp extinguishes and the red lamp
on the 177 Test Fixture lights when the protective box
cover is closed.

CHECK-The red lamp extinguishes, yellow lamp lights,
and collector sweep is disabled when the protective box is
opened.

13. Check Automatic Positioning with Collector Supply Polarity Change

Page 5-10

CH ECK-The spot should shift from the center reference
to the lower-left corner, within ±0.1 division when COLLECTOR SUPPLY POLARITY is switched to +.

CHECK-The spot should shift to the upper-right corner
of the graticule when the COLLECTOR SUPPLY POLARITY·is switched to-.

STEP GENERATOR-VOLTAGE MODE
9. Check Vertical Amplifier Gain

Page 5-8

CHECK-375 mV should produce a vertical deflection of
7.5 divisions, ±0.15 division.

10. Check Collector Supply Peak Voltages

Page 5-10

CH ECK-The 11th spot should be within 3% (2.4divisions) of the +40-volt reference.

Page 5-8

-GHECK-The voltages should produce the deflections
shown in Table 5-4.

5-2

14. Check Step/Offset Amplitude Accuracy
at 2 V

CHECK-The 11th spot should be within 3% (2.4divisions) of the -40-volt reference.

®

Performance Check-571-D1 or 02 Service
15. Check Linearity at Maximum Voltage
and Current

Page 5-11

CHECK-Position the spots successively (11th, 10th,
9th, etc.) to the center reference. Each spot should be
within 2% (±0.1 major division) of the position of the
reference spot (10th).

CHECK-Each step must be within ±2% of any other
step.

CHECK-Recheck as above for +DC COLLECTOR
SUPPLY POLARITY.

16. Check Linearity in Oppose

Page 5-12

CHECK-At 7 volts, the trace should be displaced
vertically not more than 1.2 divisions downward from the
vertical reference. See Fig. 5-5A and 5-5B.

CHECK-At 7 volts, the trace should be displaced
vertically not more than 1.2 divisions upward from the
vertical reference. See Fig. 5-6A and 5-6B.

22. Check Step/Offset Amplitude Absolute
Accuracy, STEP Xl

Page 5-18

CHECK-See the procedure and Tables 5-8 and 5-9.

23. Check Maximum Current and Voltage
Limits with Opposing Offset

Page 5-20

CH EC K-The distance between any two successive spots
should be within 2% of the distance between any other
adjacent spots.

CHECK-Vertical deflection from the center reference
should be> 10 mA, but < 20 mA (> 2 divisions, but < 4
divisions).

Page 5-12

CHECK-The horizontal deflection from the center
reference should be > 1 volt, but < 5 volts (> 1 division,
but < 5 divisions).

17. Check Maximum Current Limit

CHECK-Maximum current should be less than 200 mA
(4 divisions of deflection at 50 mA/DIV).

CHECK-Maximum current should be less than 200 mA
with STEP/OFFSET POLARITY NORM button out.

18. Check Step/Offset Amplitude Absolute
Accuracy, Step Xl

24. Check Pulsed 300 ~s and Step Rates

Page 5-21

CHECK-See the procedure and Fig. 5-7,5-8,5-9,5-10,
and5-11AorB.

Page 5-13

PERFORMANCE CHECK

CHECK-See the procedure and Table 5·6.

Preliminary
19. Check Step/Offset Amplitude Absolute
Accuracy, X.l

Page 5-14

CHECK-See the procedure and Table 5-7.

STEP GENERATOR-CURRENT MODE
20. Check Maximum Current and Voltage

Page 5-15

CHECK-At 5 volts, the trace should be displaced not
more than 2.2 divisions downward from the vertical reference and not above the vertical reference. See Fig. 5-3A and
5-3B.

Set the controls as follows:
MAX PEAK VOLTS
SERIES RESISTORS
COLLECTOR SUPPLY
POLARITY
VARIABLE COLLECTOR %
HORIZ VOL TS/DIV
NUMBER OF STEPS

CHECK-At 5 volts, the trace should be displaced
vertically not more than 2.2 divisions upward from the
vertical reference. See Fig. 5-4A and 5-4B.

All Dark Gray Buttons
and Knobs
STEP/OFFSET AMPL
PULSED, 300~s
VERTICAL CURRENT/DIV
Terminal Selector

21. Check Current at 100 mA (Step/Offset
Amplitude) and Maximum Voltage

INTENSITY
FOCUS
LEFT·RIGHT

®

Page 5-16

6.5
.12
AC
10
200 V, COLLECTOR
10 (clockwise)

in
.1 V
out
2A
EM ITIER GROUNDED
BASE TERM,STEP GEN

ccw
centered
Off (center)

5-3

Performance Check-577-D1 or D2 Service
TRACE ROTATION

D10nly
STORE
UPPER and LOWER
Erase Selectors
UPPER and LOWER
POWER Switch (D1 or D2)
BRIGHTNESS

out
in
on
cw

,_ Check CRT Operation
INTENSITY
a. While holding the BEAM FINDER button depressed,
turn the INTENSITY control slowly clockwise.

b. CHECK-A spot should appear within the graticule
area.

c. Release the BEAM FINDER button and turn the
I NTENSITY control counterclockwise.

a. Set the HORIZ VOLTS/DIV control to .5V, COLLECTOR and adjust the VARIABLE COLLECTOR % for
10 divisions of display horizontally.

b. CHECK-If the trace is not parallel to the center
graticule line, adjust the TRACE ROTATION control (rear
screw-driver adjustment) to align the trace with the center
graticule line.

GEOMETRY
a. Using the Vertical POSITION control, position the
trace to the bottom graticule line.

b. CHECK-Bowing should not exceed.0.1 division over
the ten-d ivision trace.

c. Vertically position the trace to the top graticule line.
FOCUS
a. Set the FOCUS control fully clockwise and turn the
INTENSITY control fully clockwise.

b. CH EC K-The spot should be round (if the spot is not
round, the Astigmatism control, R1286, Astig, should be
adjusted) .

c. Turn the FOCUS control counterclockwise until the
spot is the smallest possible while turning the INTENSITY
control counterclockwise to reduce the spot intensity. A
focused, high-intensity spot can burn the CRT phosphor.

d. Place a diode adapter (013-0111-00) in the right-hand
set of 177 jacks and place a 1 krl resistor in the diode
adapter.

e. Switch the VERTICAL CURRENT/DIV control to
1 mA and HORIZ VOLTS/DIV to 1 V,COLLECTOR.

f. Set the LEFT-RIGHT switch to RIGHT and turn the
VARIABLE COLLECTOR % control clockwise until the
diagonal line reaches to approximately the top and bottom
graticule lines.

g. CHECK-The diagonal trace should be in focus
throughout its length. Minor readjustment of the FOCUS
control may be necessary. Switch the LEFT-RIGHT switch
to Off.

5-4

d. CHECK-Bowing should not exceed 0.1 division over
the ten-d ivision trace. Position the trace to the graticule
center.

e. Set VARIABLE COLLECTOR % to O. Remove the
diode adapter and connect a patch cord between emitter
(E) and collector (C) term inals on the right-hand set of
jacks on the 177. Set the VERTICAL CURRENT/DIV to
1 mAo Switch the LEFT-RIGHT switch to RIGHT. The
trace should be verti.cal. Set the VARIABLE COLLECTOR
% for at least 8 divisions of vertical trace.

f. Horizonta"y position the trace to the left graticule
line (zero line).

g. CHECK-Bowing should not exceed 0.1 division over
the eight graticule divisions.

h. Horizonta"y position the trace to the right (tenth)
graticule line.

i. CHECK-Bowing should not exceed 0.1 division over
the eight graticule divisions. Return the trace to graticule
center.

2. Check Beam Finder
a. Turn the VARIABLE COLLECTOR % to O. Switch
the LEFT-RIGHT switch to Off. Set HORIZ VOL TS/DIV
to 200 V, COLLECTOR. Set INTENSITY for a visible spot.

REV SEP 1981

Performance Check-577-D1 or D2 Service
b. While holding the BEAM FINDER button pressed in,
rotate both vertical and horizontal POSITION controls
throughout their range.

c. CHECK-The spot cannot be positioned out of the
graticule area. Release the BEAM FINDER button and
center the spot vertically and horizontally.

d. Increase the INTENSITY as necessary for a bit
brighter than normal display.

e. Slowly turn the Vertical POSITION control to write the
entire screen. If the screen does not write uniformly, increase the INTENSITY and rewrite.

3. Check Trace Dimming
a. Set the controls as follows:
MAX PEAK VOLTS
VARIABLE COLLECTOR %
COLLECTOR SUPPLY
POLARITY
HORIZ VOL TS/DIV
INTENSITY
BRIGHTNESS

c. Press the ERASE button. Note a dim background
glow with the horizontal line displayed.

6.5
20
AC
200 V, COLLECTOR
visible trace
counterclockwise
(01 only)

b. Turn the VARIABLE COLLECTOR % control to 0
and watch the spot intensity.

c. CHECK-The spot should dim noticeably or disappear when the VAR IABLE COLLECTOR % control is
turned to O.

f. CHECK-The written screen should have uniform
brilliance.

g. Press the ERASE button. Release the UPPER and
LOWER STORE buttons.

h. Switch the HORIZ VOLTS/DIV to STEP GEN, NUMBER OF STEPS to 10, STEP FAMILY to REP, and STEP
RATE to FAST. Position the first spot (furthest left) to the
lower-left graticule corner.

i. Press the UPPER and LOWER STORE buttons to the
in position.

j. Push the ERASE button.

d. Turn the BRIGHTNESS control fully clockwise.
(01 only)
e. CHECK-The spot should intensify.

4. Check Storage Operation (01 only)
a. Set the controls as follows:
VARIABLE COLLECTOR %
Vertical POSITION
Horizontal POSITION
HORIZ VOL TS/DIV
VERTICAL CURRENT/DIV
STORE
UPPER and LOWER
Erase Selector
UPPER and LOWER
BRIGHTNESS

"'='80
centered
centered
1 V, COLLECTOR

I. CHECK-The display should be 11 vertical traces, approximately uniform in appearance from top to bottom and
with all vertical traces similar in appearance.

m. Turn the INTENSITY control fully counterclockwise.

n. Turn the VARIABLE COLLECTOR % to O.
2A
in
in
clockwise

b. Set the INTENSITY control for normal viewing
intensity of the display.

REV NOV 1983

k. Decrease the INTENSITY control to display the smallest spots consistent with good storage. Rotate the Vertical
POSITION control very slowly clockwise to write 11 vertical
traces.

o. CHECK-Slowly turn the BRIGHTNESS control
counterclockwise and note that the stored display and background glow dim. Turn the BRIGHTNESS control slowly
clockwise and note that the display brightens.

p. Press to release the UPPER and LOWER STORE
buttons to the out position.

5-5

Performance Check-577-01 or 02 Service

5. Check Horizontal Amplifier Balance

b. Connect a DVM between the emitter sense (E
SENSE) and base (B) terminals, right side.

a. Set the controls as follows:
MAX PEAK VOL TS
SERIES RESISTORS
VARIABLE COLLECTOR %
X10 HORIZ MAG
HORIZ VOL TS/DIV
Horizontal POSITION
STEP FAMILY
SINGLE
Vertical POSITION
VERTICAL CU RRENT/DIV
LEFT-RIGHT

6.5
8k

c. Set the OFFSET MULT to 0.00.

0
out
5 V,COLLECTOR
centered

d. Check and note the DVM reading.

e. Position the spot to the left-center graticule (centered
vertically on the zero line).

press
centered
2A
RIGHT

f. Adjust the OFFSET MULT for a DVM reading
500 mV greater than that noted in part d.

g. CHECK-The spot should be at the right-center
graticule line, with in ±2.5% (0.25 major division).
b. Connect a patch cord from the right-side collector
(C) terminal to the emitter (E) terminal.

7. Check Horizontal Magnifier
c. Switch the HORIZ VOLTS/DIV switch from 5 V,
COLLECTOR, to 2 V, COLLECTOR.

d. CH EC K-Spot movement should not exceed
0.5 major division while switching between 5 V /DIV and
2 V/DIV, COLLECTOR.

a. Set the controls as follows:
STEP/OFFSET AMPL
OFFSET
AID
X10 HORIZ MAG
HORIZ VOLTS/DIV

.05 V

in
out
5 mV, BASE

b. Set the OFFSET MULT control to 0.00. Record the
DVM reading. Position the spot to left center.
e. Remove the patch cord. Push the X10 HORIZ MAG
in.

c. Adjust the OFFSET MUL T for a DVM reading of
0.050 volts greater than that noted in part b.

6. Check Horizontal Gain

d. CHECK-The spot should be on the right-center
graticule line, ±0.3 division.

a. Set the controls as follows:
COLLECTOR SUPPLY
POLARITY
HORIZ VOLTS/DIV
STEP/OFFSET AMPL
VERTICAL CURRENT/DIV
LEFT-RIGHT

AC
50 mV, BASE
.1 V
2A
RIGHT

All Dark Gray Buttons and Knobs in except:
STEP FAMILY
OFFSET
ZERO
AID (light gray
button)

5-6

SINGLE
out
in

8. Check Horizontal Display Accuracy
a. Set the controls as follows:
OFFSET MULT
MAX PEAK VOLTS
SERIES RESISTORS
STEP/OFFSET AMPL
COLLECTOR SUPPLY
PLARITY
VERTICAL CURRENT/DIV
LEFT-RIGHT

0.00
6.5
2k
.1 V
+DC
2A
RIGHT

REV NOV 1983

Performance Check-577-D1 or D2 Service

i. Set the controls as follows:

All Dark Gray Buttons and Knobs in except:
SINGLE

STEP FAMILY
OFFSET
ZERO
AID (light gray
button)
HORIZ VOL TS/DIV

HORIZ VOL TS/DIV
VARIABLE COLLECTOR %
MAX PEAK VOLTS
SERIES RESISTORS
COLLECTOR SUPPLY
POLARITY
VERTICAL CURRENT/DIV
LEFT-RIGHT

out
in
50 mY, BASE

b. Note the DVM reading.

5 V, COLLECTOR

o
100
2M
+DC
2A
RIGHT

c. Position the spot to left-center graticule.

d. Set the OFFSET MULT to produce a DVM reading
of 0.500 volt greater than that noted in part b.

j. Position the spot to left-center graticule, using the
vertical and horizontal POSITION controls.

WARNING

e. CHECK-The spot position should be within the
limits shown in columns 4 and 5 in Table 5-2.

I

Enabling the 100, 400 or 1600 V supplies without
the protective box exposes the operator to potentially
lethal voltages at the 177 terminals.

f. For each listing in Table 5-2, proceed as follows:
Push the ZERO button to the in position and note the
DVM reading; position the spot to the left-corner graticule
line; release the ZERO button, readjust the OFFSET
MULT, if necessary, to the voltmeter reading pluJ the
reading previously noted, and CHECK the spot position.

TABLE 5-2
HORIZ
VOLTS/DIV

STEP/
OFFSET
AMPL

Voltmeter
Reading

Spot
Position

Limit
in
Div

50 mY, BASE
.1 V, BASE
.2 V, BASE
.5 V, BASE
1 V, BASE
2 V, BASE

.1 V
.2 V
.5V
1V
2V
2V

0.5 V
1.0 V
2.0V
5.0V
10.0V
18.0V

10th div
10th div
10th div
10th div
10th div
9th div

±0.3
±0.3
±0.3
±0.3
±0.3
±0.27

g. Set the LEFT-RIGHT switch to Off. Disconnect the
DVM lead from B and reconnect the lead to C SENSE
(DVM from C SENSE to E SENSE).

k. Push the red I nterlock Defeat button and set the
V AR IABLE COLLECTOR % control for a 50-volt DVM
reading.

I. CHECK-The spot should be at the 10th graticule
division, ±0.3 division.

m. Continue the test through 200 V /0 IV, COLLECTOR, as shown in Table 5-3. Readjust VARIABLE
COLLECTOR % as necessary.

TABLE 5-3
HORIZ
VOLTS/DIV
COLLECTOR

MAX
PEAK
VOLTS

DC
Voltmeter
READING

SPOT
Position

LIMIT
in
Div

5V
10 V
20V
50V
100V
200V

100
400
400
1600
1600
1600

50.0V
100.0 V
200.0 V
500.0 V
1000.0 V
1000.0 V

10th div
10th div
10th div
10th div
10th div
5th div

±0.3
±0.3
±0.3
±0.3
±0.3
±0.15

E.

n. Turn the VARIABLE COLLECTOR % to 0, switch
LEFT-RIGHT to Off.

®

5-1

h. Connect a 0.01 fJ.F, 1000 V capacitor between C and

Performance Check-577-Dl or 02 Service
o. Discharge the capacitor (short-circuit the leads) and
remove the capacitor and the DVM.

9. Check Vertical Amplifier Gain
a. Set the controls as follows:
MAX PEAK VOLTS
SERIES RESISTORS
COLLECTOR SUPPLY
POLARITY
VARIABLE COLLECTOR %
STEP/OFFSET AMPL
OFFSET MULT

100
30
AC

o
.05 VOLTS
0.00

A" Dark Gray Buttons and Knobs in except:
STEP FAMILY
OFFSET
ZERO
AID (light gray
button)
DISPLAY FILTER
HORIZ VOL TS/DIV
Horiz POSITION
VERTICAL CURRENT/DIV
LEFT-RIGHT

SINGLE
in
in
out
200 V, COLLECTOR
center
50 nA
Off

10. Check Collector Supply Peak Voltages
a. Set the controls as follows:
VARIABLE COLLECTOR %
MAX PEAK VOLTS
SERIES RESISTORS
COLLECTOR SUPPLY
POLARITY
HORIZ VOLTS/DIV
(COLLECTOR VOLTS)
VERTICAL CURRENT/DIV

2A

All Dark Gray Buttons
and Knobs
LEFT-RIGHT

in
Off

d. Position the spot to the top-center graticule line, and
note the DVM reading.

e. Push to release the OFFSET ZERO button.

+DC
1V

b. Position the spot to the lower-left corner of the
graticule.

c. Set VARIABLE COLLECTOR % to 100 and install
the protective box.

d. CHECK-For the approximate deflection
listed in Table 5-4.

(voltage~

e. Set MAX PEAK VOLTS and HORIZ VOL TS/DIV to
the next settings in Table 5-4 and repeat parts d and e.

b. Connect the DVM between E and B and a shorting
patch cord between Band C, right side.

c. Switch LEFT-RIGHT to RIGHT.

0
6.5
.12

TABLE 5-4

MAX PEAK
VOLTS

HORIZ
VOLTS/DIV

Approximate
Deflection
in Divisions

6.5

1V

6.5

25

5V

5

100

20 V

5

400

50V

1600

200 V

8
8

f. Turn the OFFSET MUL T to produce a DVM reading
of 0.375 volt greater than the DVM reading noted in part d.
f. Set COLLECTOR SUPPLY POLARITY to -DC, push
DISPLAY INVERT, and set VARIABLE COLLECTOR %
to O.

g. CH EC K-The spot should deflect 7.5 divisions,
±0.15 division. This checks the 177-577 gain accuracy.
g. Repeat parts b through e.
h. Switch LEFT-RIGHT to Off. Remove the DVM and
patch cords.

5-8

h. Remove the protective box.

REV SEP 1981

Performance Check-577-D1 or D2 Service

11. Check Max Peak Current and Circuit Breaker
Operation

I. Set VARIABLE COLLECTOR % to 0 and install the
protective box.

a. Set the controls as follows:
VARIABLE COLLECTOR %
MAX PEAK VOLTS
SERIES RESISTORS
COLLECTOR SUPPLY
POLARITY
HORIZ VOL TS!DIV
VERTICAL CURRENT!DIV
All Dark Gray Buttons
and Knobs
LEFT-RIGHT

m. Set the VERTICAL CURRENT!DIV for the MAX
PEAK VOLTS settings listed in Table 5-5, starting with
25 MAX PEAK VOLTS.

o
6.5
.12

n. Set the SERIES RESISTORS knob (pull to unlock
knob) for a MAX PEAK POWER-WATTS of 100.

+
1 V, COLLECTOR

o. Turn the VAR IABLE COLLECTOR % fully
clockwise, note the peak current, and turn the VAR IABLE
COLLECTOR % fully couterclockwise.

2A

in
RIGHT
p. CH ECK-The peak current noted in part 0 should be
equal to or greater than the current lim it shown for the
MAX PEAK VOLTS setting in Table 5·5.

b. Connect a short, heavy-gauge patch cord from C to E,
right side. Position the spot to the lower-left corner of the
graticule.

q. Set MAX PEAK VOLTS to the next setting in the
tab Ie and repeat parts 0 through q.

c. Adjust VAR IABLE COLLECTOR % for 2 vertical
divisions of display.

d. Position the top of the display to the bottom
graticu Ie line (most of the display is now off screen).

e. Adjust the VARIABLE COLLECTOR % fully clockwise.

f. CHECK-The top of the trace is off the top of the
graticule (> 20 A).

g. CHECK-The COLLECTOR SUPPLY
BREAKER must open within 2 minutes.

CIRCUIT

TABLE 5-5
VERTICAL
CURRENT!DIV

Current

25

2A

;;;>5 A

;;;>2.5 div

MAX PEAK
VOLTS

Limit
Deflection

100

.5A

;;;>1.25 A

;;;>2.5 div

400

.1 A

;;;>.31 A

;;;>3.1 div

1600

20mA

;;;>SOmA

;;;>4.0 div

r. Remove the protective box and patch cord.

12. Check Collector Supply Interlock
a. Set the controls as follows:

h. Set the SER IES RESISTORS to .5.

i. CHECK-The CIRCUIT BREAKER
within 1 minute after opening.

can be reset

j. Adjust the VARIABLE COLLECTOR % to O. Position the display to the lower-left corner and readjust
VARIABLE COLLECTOR % to 5 vertical divisions (10 A).

k. CHECK-The CIRCU IT BREAKER should not open.

REV SEP 1981

MAX PEAK VOLTS
SERIES RESISTORS
VARIABLE COLLECTOR %
HORIZ VOL TS!DIV
COLLECTOR SUPPLY
POLARITY
LEFT-RIGHT

1600
SM
0
10
AC
Off

b. Install the protective box on the 177 Test Fixture.
Open the protective box lid.

5-9

Performance Check-577-01 or 02 Service
c. CHECK-The yellow COLLECTOR SUPPLY DISABLED lamp is lighted.

d. Close the lid on the protective box.

d. CHECK-The spot should shift to the lower-left
corner of the graticule, within iO.l division.

e. Switch the COLLECTOR SUPPLY POLARITY to-.

e. CHECK-The yellow lamp should extinguish and the
red lamp on the 177 Test Fixture should turn on.

f. CHECK-The spot should shift to the upper-right
corner of the graticule, within iO.l division.

f. Turn the VARIABLE COLLECTOR % clockwise to
produce a 10-division horizontal trace.

STEP GENERATOR-VOLTAGE MODE

14. Check Absolute Accuracy at 2 V/Step
g. Lift the protective box lid.

a. Set the controls as follows:

h. CHECK-The red lamp extinguishes, the yellow lamp
lights, and the collector sweep is disabled (no trace, only a
spot).

i. Close the lid on the protective box.

j. Switch the MAX PEAK VOLTS to 400 and SERIES
RESISTORS to 500 k and repeat parts c through h.

k. Switch the MAX PEAK VOLTS to 100 and SERIES
RESISTORS to 30 k and repeat parts d through h.

I. Remove the protective box from the 177 Test
Fixture.

13. Check Automatic Positioning with Collector
Polarity Change
a. Set the controls as follows:
MAX PEAK VOLTS
SERIES RESISTORS
COLLECTOR SUPPLY
POLARITY
VARIABLE COLLECTOR %
VERTICAL CURRENT/DIV
HORIZ VOL TS/DIV

6.5
.12

100
2M

a
+DC
2V
10
10.00

All Dark Gray Buttons and Knobs in except:
OFFSET
ZERO
AID (light
gray button)
Xl0 HORIZ MAG
HORIZ VOLTS/DIV
(MAG On)

out
in
out
.5 V, COLLECTOR

b. Connect the DVM between E and C, left side, and
connect a 0.1 J.!F, 100 V capacitor across E and C, left side.
c. Patch B to C, right side, and connect a 400 n, 1%,
la-watt resistor between E and B, right side. The two
200 n resistors supplied with the kit can be used for this
test.

AC

a
2A
100 V, COLLECTOR

b. Position the spot vertically and horizontally to the
graticule center.

c. Set the COLLECTOR SUPPLY POLAR ITY to +.

5-10

MAX PEAK VOLTS
SERIES RESISTORS
VARIABLE COLLECTOR %
COLLECTOR SUPPLY
POLARITY
STEP/OFFSET AMPL
NUMBER OF STEPS
OFFSET MULT

d. Switch LEFT-RIGHT switch to LEFT. Press the
Interlock Defeat button and adjust the VARIABLE COLLECTOR % to produce a DVM reading of +40.00 volts.

e. Horizontally position the spot to graticule center or
to a point near center and note the spot position. Release
the I nterlock Defeat button.

f. Switch LEFT-RIGHT to RIGHT.

®

Performance Check-571-01 or 02 Service
g. CHECK-The 11th spot should be within 3% of the
40·volt reference noted in part e. 3% is 1.2 volts, or
2.4 divisions at 0.5 volts per division.

b. Place a 200 n, 1%, 10 watt resistor between C and B,
right side, and another 200 n, 1%, 10 watt resistor between
C and E, right side.

h. Switch COLLECTOR SUPPLY POLARITY to -DC.

c. Switch LEFT-RIGHT to RIGHT, press the BEAM
FIN DE R button to locate the spot, and position the 11th
spot to graticu Ie center or a reference point near center and
note the position of the 10th and 11th spots (see Fig. 5-1).

i. Switch LEFT·RIGHT to LEFT, press BEAM
F IN DE R, and vertically center the spot on the graticule.
Push the Interlock Defeat and adjust VAR IABLE COLLECTOR % for -40 volts on the DVM. Horizontally position
the spot to a reference point near graticule center. Release
the Interlock Defeat.

e. CHECK-With the 10th spot at the center reference,
the 9th spot should be within ±2% (±0.1 major division) of
the position of the 10th spot in part c.

j. Switch LEFT-RIGHT to RIGHT.

k. CHECK-The 11th spot should be within 3%
(±2.4 divisions) of the 40-volt reference noted in part i.

I. Remove the DVM and capacitor, 400
shorting strap from B to C.

d. Position the 10th spot to the center reference and
note the position of the 9th spot.

n

f. CHECK-Position each spot (8th, 7th, 6th, etc.) to
the center reference and note that each lower spot must be
with in ±2% (±0.1 major division) of the 10th spot in part c .

resistor and

15. Check Linearity at Maximum Voltage and
Current

g. The measurement in each part must be within ±2% of
the measurement in any other part.

h. Reset COLLECTOR SUPPLY POLAR ITY to -DC.

a. Reset the controls as follows:
HORIZ VOL TS/DIV
(MAG On)
COLLECTOR SUPPLY
POLARITY

Fig. 5-1. Illustration of step 15c.

REV. B, FEB . 1975

.2 V, COLLECTOR
+DC

i. Press the BEAM FINDER and position the 11th
(furthest left) spot (see Fig. 5-2) to graticule center and
note the position of the 10th and 11 th spots (reposition
vertically as necessary).

Fig_ 5 -2. Illustration of step 15i.

5-11

Performance Check-577-01 or 02 Service

j. Position the 10th spot to graticule center and note the
position of the 9th spot.

k. CHECK-With the 10th spot at the center reference,
the 9th spot should be within ±2% of the position of the
10th spot in part i.

I. CHECK-Position each spot (8th, 7th, 6th, etc.) to
the center reference and note that each lower spot is within
±2% of the 10th spot in part i.

m. Remove the resistors.

16. Check Linearity in Oppose

VARIABLE COLLECTOR %
STEP/OFFSET AMPL
OFFSET MULT

o
2V
10.00

All Dark Gray Buttons and Knobs in except:
OFFSET
ZERO
AID (light
gray button)
HORIZ VOL TS/DIV
VERTICAL CURRENT/DIV
LEFT-RIGHT

out
in
200 V, COLLECTOR
50mA
Off

b. Patch C to B, right side.

a. Reset the controls as follows:
STEP/OFFSET AMPL
HORIZ VOL TS/DIV
OFFSET
AID

1V
.2 V, BASE

out

b. Position the 1st spot (right end of the display) to a
reference point near graticule center.

c. Note the positions of the 1st and 2nd spot (d istance
between spots).

c. Vertically and horizontally position the spot to
graticule center. Switch LEFT-RIGHT to RIGHT.

d. CHECK-The maximum current should be less than
200 mA (4 divisions of vertical deflection at 50 mA/DIV).

e. Press to release the STEP/OFFSET POLARITY
NORM button to the out position.

f. CHECK-The maximum current should be less than
200 mA (4 divisions of vertical deflection from the graticule center line).

d. Reposition the 2nd spot to the reference in part b.
g. Reset the controls as follows:
e. CHECK-The distance between the 2nd and 3rd spots
should be within ±2% (±0.1 major division) of that in part

c.
f. Position each successive spot (3rd, 4th, etc.) to the
reference.

g. CHECK-The distance between any two spots should
be within ±2% of the distance between any other two
adjacent spots.

STEP FAMILY
SINGLE
OFFSET
AID
VERTICAL CU RRENT/DIV
LEFT-RIGHT

press
out
5 mA
Off

h. Horizontally and vertically position the spot to
graticule center.

i. Switch LEFT-RIGHT to RIGHT.

17. Check Maximum Current Limit
a. Set the controls as follows:
MAX PEAK VOLTS
SER IES RESISTORS
COLLECTOR SUPPLY
POLARITY

5-12

6.5
.12
AC

j. CHECK-Maximum current should be 10 mA
(2 divisions) or greater, of vertical deflection, but less than
20 mA (4 divisions).
k. Push the STEP/OFFSET POLARITY NORM in.

®

Performance Check-577-D1 or 02 Service

I. CHECK-Maximum current should be 10 mA
(2 divisions) or greater, of vertical deflection, but less than
20 mA (4 divisions).

m. Set LEFT·RIGHT switch to Off. Remove B to C
patch cord.

18. Check Step/Offset
Accuracy, Step Xl

Amplitude

Absolute

I. Push the AID button in and set the OFFSET MUL T
to produce the DVM reading shown in Table 5-6.
m. Position the spot to approximately 0.5 of limit in
divisions from Table 5-6 to the right of center and note the
position.
n. Reset the OFFSET MUL T dial to 10.00.

a. Reset the controls as follows:
All Dark Gray Buttons and Knobs in except:
X10 HORIZ MAG
STEP FAMILY
HORIZ VOL TS/DIV
(MAG On)
STEP/OFFSET AMPL
OFFSET AID
(light gray button)
LEFT-RIGHT
NUMBER OF STEPS
OFFSET ZERO

k. CHECK-The spot should be within limit in divisions
given in Table 5-6 to the right of the reference in part d.

o. CHECK-The spot should be within limit in divisions
given in Table 5-6 to the left of the position noted in
part m.

out
SINGLE
.2 V, BASE
1V
in
RIGHT
fully clockwise
out

b. Connect the DVM between Band E, right side; the

p. Press the STEP FAM IL Y REP and ZERO buttons in.
q. CHECK-The spot should be within limit in divisions
given in Table 5-6 to the left of the position noted in
part m.

r. Push the OFFSET POLARITY NORM button in.
Push the STEP FAMILY SINGLE button, release the
ZERO button to the out position and release the AID
button to the out position.

(+) lead to B.
c. Set the OFFSET MUL T to the DVM reading shown
in Table 5-6. If th is voltage cannot be set, the Step
Generator is m isadjusted at the low end (recalibrate the
Step Generator).
d. Position the spot to approximately 0.5 of limit in divisions from Table 5-6 left of center and note the position of
the spot.

s. CHECK-The spot should be within limit in divisions
given in Table 5-6 to the left of the reference in part m.
t. Push the AID button in.
u. Using Table 5-6, repeat parts c through t for each of
the STEP/OFFSET AMPL settings. Use the HOR IZ
VOL TS/DIV, OFFSET MUL T, and DVM settings shown in
the table and use the positions and limits shown.

e. Set the OFFSET MUL T dial to 10.00.
TABLE 5-6
f. CHECK-The spot should be within limit in divisions
given in Table 5-6 (to the right) of the position noted in
part d.

STEP/
OFFSET
AMP

g. Push the ZERO and STEP FAMILY buttons in.

+1 V
-1V
+.5V
-.5V
+.2 V
-.2V
+.1 V
-.1 V
+.05 V
-.05 V

h. CHECK-The spot should be within limit in divisions
given in Table 5-6 to the right of the reference position
noted in part d.
i. Push to release the OFFSET POLARITY NORM
button.

j. Push STEP FAMILY SINGLE button, release ZERO
button to the out position, and release the AID button to
the out position.

REV SEP 1981

l

HORIZ
VOLTS/
DIV
.2V
.1 V
50 mV
10 mV
5 mV

DVM
Reading

+9.7
-9.7
+4.85
-4.85
+1.94
-1.94
+0.97
-0.97
+0.485
-0.485

V
V
V
V
V
V
V
V
V
V

Limit in l
Divisions

+3
-3
+3
-3
+2.4
-2.4
+6
-6
+6
-6

+ = to the right of the reference
- = to the left of the reference

5-13

Performance Check-577-D1 or 02 Service

19. Check Step/Offset Amplitude Absolute
Accuracy, Step X.1

j. CHECK-The spot should be not mroe than ±4 divisions from the referel')ce.

a. Set the controls as follows:
COLLECTOR SUPPLY
POLARITY
NUMBER OF STEPS

AC
counterclockwise

k. Push the STEP/OFFSET POLARITY NORM and the
DISPLAY INVERT NORM buttons to release to the out position. Note: For each succcessive step in Table 5-7 alternate the position of these buttons.

All Dark Gray Buttons and Knobs in except:
STEP X.l
OFFSET
AID (light
gray button)
STEP/OFFSET AMPL
HORIZ VOLTS/DIV
VERTICAL CURRENT/DIV
LEFT-RIGHT

out

I. Press the STEP FAMILY SINGLE button and push to
release the OFFSET ZERO button to the out position.

in
.2V
.2 V, BASE

m. Readjust the OFFSET MULT for 2.000 volts, ± 5 mV
on the DVM.

2A
RIGHT

b. Connect the DVM between Band E, right side.

c. Horizontally position the first (furthest left of the two
displayed spots) to the left crt edge.

d. Turn the NUMBER OF STEPS control clockwise until
10 steps (11 spots) are displayed horizontally. Horizontally
position the 11th spot to graticule center. Pull the X10
HORIZ MAG knob.

n. Set the spot to a reference point as detailed in part h.

o. Push the STEP FAMILY REP and OFFSET ZERO
buttons in.

p. CHECK-The spot should be within ± 4 divisions of
the reference.

q. USing Table 5-7, reset the controls to the next set of
conditions.

r. Repeat parts e through p, using the control settings,
DVM readings, and limits for each of the items in the table.

e. Reset the 11th spot to graticule center.
TABLE 5-7
f. Push STEP FAMILY SINGLE button and push OFFSET ZERO button to release to the out position.

g. Set the OFFSET MULT for a DVM reading of 2.000
volts, ±5 mY.

h. Reposition the spot, relative to graticule center or a
reference point near graticule center by the amount of difference, if any, of the DVM reading from 2.000 volts (example:
if the difference from 2.000 volts is +5 mV, then, at
20 mV/DIV, 5 mV is equal to 0.25 major divisions. Set the
spot 0.25 division to the right of graticule center or a reference point near center. If in the negative direction, set the
spot to the left of the reference point).

i. Press the STEP FAMILY REP button and the OFFSET
ZERO buttons in.

5-14

STEP/
OFFSET
AMPL

HORIZ
VOLTS/DIV
(magnified)

DVM
Max Deviation (4%)
Reading from the reference
(Volts)
(in divisions)

.2V

20mV

2.000,
±5mV

±4

.1 V

10mV

1.000,
±2.5 mV

±4

.05 V

5mV

0.500,
±5mV

±4

.02 V

5mV

0.200,
±0.5 mV

±1.6

.01 V

5mV

0.100,
±0.25 mV

±0.8

5mV

5mV

0.050,
±0.13 mV

±0.4

REV JUN 1984

Performance Check-577-01 or 02 Service

STEP GENERATION-CURRENT MODE

j. Set the VARIABLE COLLECTOR % to produce a
horizontal deflection that passes through 5 volts
(5th division right of center). See Fig. 5-3A.

20_ Check Maximum Current and Voltage
a. Set the controls as follows:
MAX PEAK VOLTS
SERIES RESISTORS
VARIABLE COLLECTOR %
COLLECTOR SUPPLY
POLARITY

6.5
.12

a
AC

All Dark Gray Buttons and Knobs in except:
STEP FAMILY
STEP RATE
STEP/OFFSET AMPL
NUMBER OF STEPS
Horizontal POSITION
Vertical POSITION
HORIZ VOL TS/DIV
VERTICAL CURRENT/DIV
LEFT-RIGHT

k. CH EC K-At 5 volts, the trace should be displaced not
more than 2.2 divisions downward from the vertical reference set in part g, and not above the vertical reference.

SINGLE
SLOW
200 mA
10
centered
centered
1 V, COLLECTOR

I. Push the ZERO and STEP FAMILY REP buttons in.

m. CHECK-At 5 volts, the trace should be displaced
not more than 2.2 divisions downward from the vertical
reference. Set in part g, and not above the vertical
reference. See Fig. 5-3B.

.5A
Off

b . Connect a 1 n, 1/4%, la-watt resistor between C and
B term inals, left side, and connect the DVM to the same (C
and B) terminals.

II--+---+---+--I--+--

CUR RENT AT

5 VOLTS

=---+_.....

c. Connect a shorting patch cord between C and B
term inals, right side. Horizontally position the spot to
graticu Ie center.

d. Switch LEFT-RIGHT switch to LEFT.

e. Push to release the ZERO button .

f. Set the OFFSET MUL T dial to produce a DVM
reading of 1.94 volts.

g. Pull the Xl0 VERT MAG and vertically position the
trace near graticule center. Do NOT reposition horizontally.
Note the position of the trace (reference).

h. Set the OFFSET MUL T dial to 10.00 and LEFTRIGHT switch to RIGHT.

i. Set MAX PEAK VOLTS to 25 and SERIES RESISTORS to 1.9.

®

Fig. 5-3. Typical displays of Step Generator current at maximum
voltage. (A) Illustrating step k and (B) illustrating step m.

5-15

Performance Check-577-01 or 02 Service
n. Reset the controls as follows:
MAX PEAK VOLTS
SERIES RESISTORS
VARIABLE COLLECTOR %
STEP/OFF POLARITY
NORM
STEP FAMILY
SINGLE
OFFSET
ZERO
LEFT-RIGHT

6.5
.12

21. Check Current at 100 mA (Step/Offset Amplitude) and Maximum Voltage
a. Set the controls as follows :

out

MAX PEAK VOLTS
SERIES RESISTORS
Horizontal POSITION

press

All Dark Gray Buttons and Knobs in except:

a

out
LEFT

o . Adjust the OFFSET MULT for 1.94 volts on the
DVM .

STEP FAMILY
STEP RATE
OFFSET
ZERO
AID (light
gray button)
HORIZ VOL TS/
DIV
STEP/OFFSET
AMPL

6.5
.12
centered

SINGLE
SLOW
out
in
2 V, COLLECTOR
100 mA

p. Position the spot vertically near graticule center and
note the vertical position of the spot (reference). Do NOT
reset horizontally.

q. Set MAX PEAK VOLTS to 25 and SERIES RE·
SISTORS to 1.9.

r. Switch LEFT ·RIGHT switch to RIGHT .

s. Reset OFFSET MUL T dial to 10.00.

t. Adjust VAR IABLE COLLECTOR % to produce a
horizontal deflection that passes through 5 volts (5th
division to the left center. See Fig . 5-4A).

u. CHECK-At 5 volts on the graticule, the trace should
be displaced vertically not more than 2.2 divisions upward
from the vertical reference set in part p, and not below ·the
vertical reference.
CURRENT
AT 5 VOLTS
V. Push the OFFSET ZERO and STEP FAMILY REP
buttons.

w. CHECK-At the left graticule line the trace should be
displaced not more than 2.2 divisions upward from the
vertical reference set in part p, and not below the vertical
reference. See Fig. 5-4B .

5-16

Fig. 5·4. Typical displays of Step Generator current at maximum
voltage. (A) Illustrating step t and (B) illustrating step w.

REV . B, FEB . 1975

Performance Check-577-Dl or D2 Service
b . Horizontally position the spot to graticule center.
Switch LEFT -RIGHT switch to LEFT. Adjust the OFFSET
MUL T for a DVM reading of 0.97 volts.

h. CHECK- At 7 volts, the trace should be displaced not
more than 1.2 divisions downward from the reference
noted in part c, and not above the vertical reference.

c. Release X10 VERT MAG and vertically position the
spot to approximately graticule center. Note the vertical
spot position for reference.

i. Push OFFSET ZERO
buttons in.

d. Switch LEFT-RIGHT to RIGHT .

and

STEP

FAMILY REP

j. CHECK-At 7 volts, the trace should not be greater
than 1.2 divisions below the reference noted in part c, and
should not be above the vertical reference . See Fig. 5-5B.

e. Switch SERIES RESISTORS to 7.5 .
f . Reset OFFSET MULT dial to 10.00.
g. Set VAR IABLE COLLECTOR % to produce a trace
that passes through 7 volts (3.5 divisions to the right of
graticule center . See Fig . 5-5Al.

k. Reset the controls as follows :
MAX PEAK VOLTS
SERIES RESISTORS
VARIABLE COLLECTOR %

6.5
.12

o

All Dark Gray Buttons and Knobs in except :
STEP FAMILY
SINGLE
OFFSET
ZERO
STEP/OFFSET
POLARITY
NORM
LEFT-RIGHT

press
out

out
LEFT

I. Set the OFFSET MUL T for a DVM reading of
0.97 volts. Vertically position the spot to graticule center.
Do NOT change horizontal position . Leave Ve rtical magnified.
m . Switch LEFT-RIGHT to RIGHT.

n. Reset SERIES RESISTORS to 7.5 .

o. Set the OFFSET MUL T dial to 10.00.

p. Set VARIABLE COLLECTOR % to produce a
horizontal trace that passes through 7 volts (3.5 divisions to
the left of graticule center. See Fig . 5-6Al .

q . CHECK-The trace, at 7 volts, should be displaced
vertically not more than 1.2 divisions above the reference
set in part I, and not below the reference.

Fig. 5-5. Typical displays of Step Generator current at maximum
voltage. (A) Illustrating step g and (B) illustrating step j.

REV SEP 1981

r. Push the OFFSET ZERO and STEP FAMILY REP
buttons in .

5-17

Performance Check-577-01 or 02 Service
s. CHECK-The trace, at 7 volts should be displaced
vertically not more than 1.2 divisions above the reference
set in part I, and not below the vertical reference. See
Fig.5-6B.

22. Check Step/Offset Amplitude Absolute Accu racy, Step Xl
a. Set the controls as follows:
MAX PEAK VOLTS
SERIES RESISTORS
VARIABLE COLLECTOR %
COLLECTOR SUPPLY
POLARITY

6.5
.12
0

All Dark Gray Buttons and Knobs in except:
STEP FAMILY
SINGLE
STEP RATE
OFFSET
ZERO
X10 VERT MAG
STEP/OFFSET AMPL
HORIZ VOL TS/DIV
VERTICAL CURRENT/DIV (MAG On)
LEFT-RIGHT
NUMBER OF STEPS

press
SLOW
out
out
50mA
200 V, COLLECTOR
10mA
Off
fully clockwise

b. Connect a 1 n, 1/4%, 10-watt resistor between Band
C, left side and connect the DVM across the 1 n resistor.

AC
c. Set the LEFT·RIGHT switch to LEFT.

d . Adjust the OFFSET MUL T for a DVM reading as
shown in Table 5-8 for the appropriate STEP/OFFSET
AMPL setting.

",","-+---+--i-

CUR RENT AT - t - - - f - o - - t - -.......
7 VOLTS

e. Position the spot vertically and horizontally
approximately to graticule center. Note the spot position.

f. Set the OFFSET MUL T dial to 10.00.

g. CHECK-The spot should be within the limits shown
in column 5 in Table 5-8 (<30 rnA = 3 divisions, or less,
vertically, from the reference point noted in part e) .

h. Reset the following controls:
OFFSET
ZERO
STEP FAMILY
REP
CURRENT AT
7 VOLTS

in
in

i. CHECK-The spot should be within the limits shown
in column 5 in Table 5-8 (~30 rnA = 3 divisions, or less,
vertically, from the reference point noted in part e).

j. Reset the controls as follows:

Fig: 5-6. Typical displays of Step Generator current at maximum
voltage. (A) Illustrating step p and (B) illustrating step s ..

5-18

STEP FAMILY
SINGLE
OFFSET
ZERO
STEP-OFFSET POLARITY
NORM

press
out
o~

®

Performance Check-571-Dl or 02 Service
k. Set the OFFSET MU LT for a DVM reading as shown
in Table 5-8 for the appropriate STEP/OFFSET AMPL
setting.

I. Position the spot vertically to approximately graticule
center and note the spot position.

m. Set the OFFSET MULT dial to 10.00.

o. Press OFFSET ZERO and STEP FAMILY REP
buttons in.

p. CHECK-The top spot should be within the limits
shown in column 5, Table 5-8.

q. Push the STEP FAMILY SINGLE and STEP/
OFFSET POLARITY NORM buttons in and push to release
OFFSET ZERO to the out position.

r. Using the next entry in Table 5-8, repeat parts d
through q, using the setting, limits, and resistors shown in
Table 5-8. Repeat for each entry.

STEP
VERTICAL
Limit in
OFFSET B-C
DVM CURRENT/DIV divisions from
(MAG On)
AMPL Resistor Reading
reference
10mA

x. CHECK-The spot should be within the limits shown
in column 5, Table 5-9.

y. Set the OFFSET ZERO and STEP FAMILY REP
buttons in.

z. CHECK-The bottom spot should be within the limits
shown in the table, with respect to the reference noted in
part u.

aa. Push STEP FAMILY SINGLE and push to release
ZERO, AID, and STEP/OFFSET POLARITY NORM buttons to the out position.

abo CHECK-The spot should be within the limits
shown in column 5, Table 5-9.

TABLE 5-8

lQ 0.485 V

v. Switch LEFT-RIGHT switch to RIGHT.

w. Set the OFFSET MULT dial to 10.00.

n. CHECK-The spot should be within the limits shown
in column 5, Table 5-8.

50mA

u. Set the OFFSET MULT for a DVM reading as shown
in Table 5-9 for the appropriate STEP/OFFSET AMPL
setting. Vertically position the spot to a point near graticule
center and note the spot position.

ac. Switch
button in.

LEFT-RIGHT to LEFT and press AID

3

20 mA

10 Q

1.940 V

5mA

2.4

10 mA

10 Q

0.970 V

2mA

5 mA

10 Q

0.485 V

1 mA

3
3

2 mA

100 Q

1.940 V

.5mA

2.4

ad. Reset OFFSET MULT for the DVM reading indicated for the STEP/OFFSET AMPL setting in Table 5-9.
Vertically position the spot to near graticule center. Note
the spot position.

ae. Switch LEFT-RIGHT switch to RIGHT.
s. Reset the controls as follows:
MAX PEAK VOLTS
SERIES RESISTORS
STEP/OFFSET AMPL
VERTICAL CU RRENT/DIV

100

30
1 mA
.2 mA

t. Connect a shorting patch cord between C and B, right
side.

®

af. Set OFFSET MULT dial to 10.00.

ago CHECK-The spot should be within the limits shown
in the table, with respect to the reference noted in part ad.

ah. Push STEP FAMILY REP and ZERO buttons in.

5-19

Performance Check-577-D1 or 02 Service
ai. CHECK-The top spot should be within the limits
shown in the table, with respect to the reference noted in
part ad.

aj. Press STEP FAMILY SINGLE and POLARITY
NORM buttons and push to release ZERO and AID buttons
to the out position.

ak. CHECK-The spot should be within the limits
shown in column 5, Table 5-9.

al. Switch LEFT-RIGHT switch to LEFT. Press AID
button in.
am. Proceed to the next settings in the table and repeat
parts u th rough am.

NOTE
Observe the footnotes to Table 5-9 when the 10 kD,
100 kD, and 1 MD resistors are used.

23. Check Maximum Current and Voltage Limits
with Opposing Offset
TABLE 5-9
STEP
CoB
OFFSET
AMPL
Resistor

1 rnA

100 D

.5 rnA
.2 rnA

1 kD

.1 rnA
50 J.lA
20 J.lA

10 kD 3

10J.lA

5 J.lA
2 J.lA
1 J.lA
.5 J.lA
.2 J.lA

100 kD4

1 MD4

.1 J.lA
50 nA

DVM
Reading

a. Set the controls as follows:

VERTICAL
Limit in
CURRENT/ divisions to
DIV
reference

0.970 V

.2 rnA

0.485 V
1.940 V
0.970 V

.1 rnA

0.485 V
1.940 V
0.970 V
0.485 V
1.940 V
0.970 V
0.485 V
1.940 V
0.970 V
0.485 V

50 J.lA
20 J.lA
10 J.lA
5 J.lA
2 J.lA
1 J.lA
.5 J.lA
.2 J.lA

.1 J.lA
50 nA
20 nA
10 nA

3
3
2.4
3
3
2.4
3
3
2.4
3
3
2.4
3
3

the C to B resistor is 10 kn and greater, the DISPLAY
FIL TER may have to be used to decrease the Vertical noise on DC
measurements. Switch the DISPLAY FILTER out of the circuit
(NORM button in) when checking STEP FAMIL Y (REP button in).

3 When

If objectionable vertical noise is present, read the center of the
display to set the reference point, then disconnect the voltmeter.
41f a DC voltmeter having an input impedance of 500 Mil or less is
used, calculate the correct voltage using the formula:

MAX PEAK VOLTS
SERIES RESISTORS
VARIABLE COLLECTOR %
COLLECTOR SUPPLY
POLAR ITY

6.5

.12
0

+DC

All Dark Gray Buttons and Knobs in except:
STEP FAMILY
SINGLE
STEP/OFFSET AMPL
HORIZ VOL TS/DIV
VERTICAL CURRENT/
DIV

press
10 rnA
1 V, COLLECTOR
5 rnA

b. Vertically and horizontally position the spot to
graticule center, or near center and note the spot position.

c. Switch LEFT-RIGHT to RIGHT (C to B patch).

d. Push to release ZERO and AID buttons.

e. CH ECK-The vertical deflection from the center
reference should be> lOrnA, but 20 rnA ( > 2 divisions,
but 4 divisions).

<

<

f. Switch SERIES RESISTORS to 8 k.

Where:
V2

= correct voltage,

g. CHECK-The horizontal deflection from the center
reference should be > 1 volt, but 5 volts ( > 1 division,
but> 5 divisions).

<

V 1 = indicated voltage, DVM reading in the table,
Rm = meter impedance,
Rs

= current sensing resistor in the table.

5-20

h. Switch COLLECTOR SUPPLY POLARITY to -DC
and push DISPLAY INVERT NORM button to release to
the out position.

REV. B, MAY, 1977

Performance Check-577-01 or 02 Service
i. CHECK-The horizontal deflection from the center reference should be > 1 volt, but < 5 volts (> 1 division, but
< 5 divisions).

o. Push the STEP RATE SLOW button.
p. CHECK-That the base line is also a pulse (see Fig.
5-9).

j. Switch SERIES RESISTORS to .12.
q. See the COLLECTOR SUPPLY POLARITY to AC.
k. CHECK-The vertical deflection from the center reference should be > 10 rnA, but < 20 rnA (> 2 divisions, but
< 4 divisions).

r. CHECK-The display should resemble Fig. 5-10 or inverted from top to bottom .
s. Push the STEP RATE NORM button.

24. Check Pulsed 300 ,."s and Step Rates
a. Set the controls as follows :
COLLECTOR SUPPLY
POLARITY
MAX PEAK VOLTS
SERIES RESISTORS
VARIABLE COLLECTOR %
PULSED 300 ILS

t. CHECK-The display should resemble that of Fig. 511 A or B (pulses at both the peaks and zero pOints).
u. Turn 577 POWER OFF.

+
6.5

2k

o

25. Check Collector Series Resistors
a. Set controls as follows :

out

All Dark Gray Buttons and Knobs in except:
STEP FAMILY
SINGLE
STEP RATE
STEP/OFFSET AMPL
HORIZ VOLTS/DIV
VERTICAL CURRENT/DIV
LEFT-RIGHT

press
SLOW
.5 V

.5 V, BASE

2 rnA

3

STEPS

Off

b. Patch from C to B, right side.
c. Position the spot horizontally and vertically to lowerleft corner of graticule.
d. Push the STEP FAMILY REP button in and adjust
NUMBER OF STEPS for 3 steps (4 spots).
e. Switch LEFT-RIGHT to RIGHT.

Fig. 5·7. Typical display illustrating step g.

f. Increase VARIABLE COLLECTOR % to 100.
g. CHECK-The display should resemble that of Fig. 57.
h. Push to release the STEP X.1 button and note the
step rate.
i. Press the STEP RATE NORM button.
j. CHECK-The step rate increased.
k. Press the STEP RATE FAST button.
I. CHECK-The step rate increased .

m. Push the PULSED 300 ILS button and the STEP X.1
button in.
n. CHECK-Note that the sweeps have been replaced
with a short-duration pulse, except for the zero line. The
pulse appears at what would have been the peaks of the
sweep. See Fig . 5-8.
REV JUN 1984

Fig. 5-8, Typical display illustrating step n.

5-21

Performance Check-577-D1 or D2 Service

COllECTOR SUPPLY POlARITY
AC
SERIES RESISTORS
.12
HORIZ V/DIV
200 V COll
VERT I/DIV
2A
RIGHT
SELECTOR
b. Measure resistance from c to e RIGHT SIDE as in
Table 5-10. For series resistance settings above 8 k, Max
peak volts will need to be set to 400. (It may be necessary
to use sense leads to make the lowest resistance
measurements).
TABLE 5-10
SERIES RES

METER READING

.12

0- .238 n

.5

.325 - .675 n

1.9

1.52 - 2.29 n

7.5

6.275 - 8.72 n

30

25.4 - 34.6 n

120

101.9 - 138.1 n

500

415 - 575 n

2k

1.7 k - 2.3 kn

8k

6.8 k - 9.2 kn

30 k

25.5 k - 34.5 kn

120 k

102 k - 138 kn

500 k

425 k - 575 kn

2m

1.7 m - 2.3 mn

8m

6.8 m - 9.2 mn

Fig. 5-9. Typical display illustrating step p.

5-22

Fig. 5-10. Typical display illustrating step r.

.

Fig. 5-11 . Typical displays illustrating step t.

REV JUN 1984

Adjustment Procedure-577-01 or 02 Service

SHORT-FORM ADJUSTMENT PROCEDURE
1. Adjust -30-Volt Supply

Page 5-24

NON STORE
Adjust R1395, to erase the screen within 1 second when
placed in the non-store mode.

Adjust R775, -30-V Adj, for -30 volts, ±0.075 volt.
9. Adjust Vertical Gain
2. Adjust +30-Volt Supply

Page 5-25

Page 5-28

Adjust R1116 for 8 divisions of vertical display.

Adjust R765, +30-V Adi, for +30 volts, ±0.075 volt.
10. Adjust Horizontal Amplifier Balance
3. Adjust -3400·Volt Supply

Page 5-25

Adjust R1275, H V Adj, for -3400volts,±170volts.
4. Adjust Intensity Range

Page 5-25

Adjust R1245, Intensity Range, as detailed in step 4.
5. Adjust Astigmatism

Adjust R530, Horiz Amp Bal, for no spot movement
while 9Nitching HORIZ VOL TS/OIV from 20 V/OIV,
COLLECTOR to 2 V/OIV, COLLECTOR.
11. Adjust Horizontal Amplifier Gain

Page 5-29

Adjust R1136, Horiz Gain Adj, for 10divisions of
horizontal deflection.

Page 5·25

Adjust R 1286, Astig, for a circular spot.
6. Adjust Trace Rotation

Page 5-28

12. Adjust Sensitivity Correction
Page 5-25

Page 5-29

Adjust R 1385, Sens Corr, for the same deflection
sensitivity in store and nonstore.

Adjust R1291, TRACE ROTATION, to align the trace
parallel to the center graticu Ie line.

13. Adjust Horizontal Compensation

7. Adjust Geometry

Adjust C503, the yellow wire, for the smallest spot size.
Adjust C511 for the least slash.

Page 5-26

Adjust R1285, Geom, for not more than 0.1 division of
bowing.

8. Adjust Storage Operation (01 only)

Page 5-26

+370-VOLT SUPPLY

14. Adjust Step Generator Polarity Balance,
Pulse Zero, and Step Zero

Page 5-30

Page 5-30

Adjust R365, Polarity Bal, for equal deflection of the
brighter spot while pushing STEP/OFFSET POLARITY
button in and out.

Adjust R1387, +370 V Adj, for +370 volts, ±7 volts.
Adjust R355, Pulse Zero, to position the brighter spot to
graticule center.
OPERATING LEVEL
Adjust R1350, Store Level, for best stored display with
Erase Selector pushed in.

Adjust R300, Step Zero, to position the dim spot to
graticule center.
Adjust R455, Amp Bal, to center the spot horizontally.

STORE BALANCE
Adjust R 1370, Store Bal, for best stored display with
Erase Selector in the out position. Operating level and store
balance level must match.

15. Adjust Polarity Positioning

Page 5-31
Adjust R528, Horiz Pos Adj, and R570, Vert Pos Adj, to
position the spot to lower-left corner of the graticule.

COLLIMATION
Adjust R1390, CE1, to the point at which the bright
area is pulled in from the graticule line by one-half major
division.

®

16. Adjust Step and Offset Amplitude

Page 5-31

Adjust R278, X 1 Step Amplitude, R352, Offset Ampl,
and R281, X.l Step Ampl, as detailed in the procedure.

5-23

Adjustment Procedure-577-01 or 02 Service
17. Adjust Step Generator Output Impedance

Page 5-32

1. Adjust -30-Volt Supply

Adjust R456, Output Z, for no spot shift as the 1 kn
and 15 kn resistors are switched.

a. Connect the DVM between GND and the -30-volt
test point on the Power Supply circuit board. See Fig. 7· 1A
for location.

ADJUSTMENT PROCEDURE

NOTE

Initial Control Settings

INTENSITY

01 or 02
counterclockwise
577

MAX PEAK VOLTS
MAX PEAK POWERWATTS
VARIABLE COL LECTOR %

6.5
.15
0

For all references to figures calling out locations of
adjustments and test points, see the pullout pages
preceding the Schematic Diagrams near the rear of the
manual.

I

WARNING

I

Turn the instrument power off while connecting and
disconnecting the DVM, since lethal voltages exist in
areas adjacent to the test points. These danger areas
are shown in Fig. 5-12.

Fig. 5-12. Location of the danger areas adjacent to the Power Supply test points.

5-24

®

Adjustment Procedure-577-D1 or D2 Service
b. ADJUST -R775 (through the back panel of the 577)
for -30 volts, ±0.075 volts (-29.925 V to -30.075 V).

c. INTERACTION-The -30-volt supply affects the
entire instrument. Adjust this supply only if the voltage is
out of tolerance or if a complete calibration is being
performed. + and -30-volt supplies must be within 1/2% of
30 volts and must be within 1/2% of each other.

NOTE
Table 4-1 (Maintenance section of this manual) lists
the voltage tolerance and regulation characteristics of
each of the supplies in the 577.

4. Adjust Intensity Range
a. Set the controls as follows:
VARIABLE COL20
LECTOR %
6.5
MAX PEAK VOLTS
.12
SERIES RESISTORS
COLLECTOR SUPPLY
AC
POLARITY
200 V, COLLECTOR
HORIZ VOL TS/DIV
centered
Horizontal POSITION
VERTICAL CUR2A
RENT/DIV
centered
Vertical POSITION
All Light Gray Buttons out
All Dark Gray Buttons and Knobs in except:
STEP RATE

SLOW

2. Adjust +30-Volt Supply
a. Connect the DVM between GN D and the +30-volt
test point on the Power Supply circuit board. See Fig. 7-1A
for location.

b. ADJUST-R765, +30 V Adj (see Fig. 7-1B for location) for a reading of +30 volts, ±0.075 V (+29.925 V to
+30.075 V). For serial numbers B050000 and up, R765 is
adjusted through the rear panel.
c. I NTERACTION-The +30-volt supply affects the
entire instrument. Adjust the supply only if the voltage is
out of tolerance or if a complete calibration is being
performed. + and -30-volt supplies must be within 112% of
30 volts, and within 1/2% of each other.

b. Turn the INTENSITY control clockwise and check
that a spot can be obtained. Turn the INTENSITY control
fully counterclockwise.

c. ADJUST -R 1245, Intensity Range, (see Fig.7-2B)
using an insulated screwdriver (hazardous voltages adjacent
to R 1245) until a" faint spot is visible. Slowly turn the
INTENSITY control clockwise 300 beyond the point at
which the trace starts to brighten (300 equals 1 panel
mark)' To make final adjustment, turn R 1245 counterclockwise until the spot just disappears.

5. Adjust Astigmatism

3. Adjust -3400-Volt Supply
a. Set the DC voltmeter to measure approximately
3400 volts.

a. Set the FOCUS control fully counterclockwise and
the INTENSITY control fully clockwise.

b. ADJUST -R 1286, Astig, for a circular spot. See
Fig. 7 -3 for location of R 1286.

b. Remove the CRT base cover from the display unit
back panel. See Fig. 7-2A.

6. Adjust Trace Rotation
c. Read the voltage between pin 2 of the CRT socket
(through a hole in the CRT socket) and GND on the Power
Supply circuit board. See Fig. 7-2A.

d. ADJUST -R 1275, H V Adi, for -3400 volts,
±170 volts (3230 volts to 3570 volts). See Fig. 7-2B.

e. INTERACTION-Adjust this voltage only if out of
tolerance or if performing a complete calibration.

REV. C, FEB. 1975

a. Turn the INTENSITY control counterclockwise to
reduce the spot intensity.

b. Adjust the FOCUS control for the smallest possible
spot.

c. Set the HOR IZ VOL TS/D IV switch to .5 V,
COLLECTOR and adjust VARIABLE COLLECTOR % for
a 10 division horizontal trace.

5-25

Adjustment Procedure-577-01 or 02 Service

d. Vertically position the trace to the center graticule
line.

8. Adjust Storage Operation (D1 only)
Set the controls as follows:

e. ADJUST-R1291, TRACE ROTATION (on rear
panel), to align the trace parallel with the center graticule
line.

7. Adjust Geometry

STORE (UPPER
and LOWER)
Erase Selector (UPPER
and LOWER)

in
in

+370-VOL T SUPPLY

a. Vertically position the trace to the bottom graticule
line.

a. Connect a DC voltmeter (20 kn/volt or greater), set
to measure at least +400 volts, between ground and the
+370-volt test point (TP2 in Fig. 7-4).

b. ADJUST -R 1285, Geom (see Fig. 7-3 for location)
for 0.1 division, or less, of bowing.

b. ADJUST -R 1387, +370-Volt Adi, for +370 volts,
±7 volts.

c. Vertically position the trace to the top graticule line.

d. Check for bowing of the trace, 0.1 division or less.

e. Vertically position the trace to the graticule centerline.

f. Connect a banana-banana patch cord between C and
E on the right set of jacks on the 177.

g. Set the HOR IZ VOL TS/DIV to STEP GEN.

h. Switch the LEFT-RIGHT switch to RIGHT.

i. Check for trace parallel with the center vertical
graticu Ie lines. See Fig. 5-13A and B for correct and
incorrect adjustment of R 1285.

j. READJUST-R1285, if necessary, for the best compromise between vertical and horizontal bowing.

k. If R 1285, Geom, has been readjusted, recheck trace
, alignment by switching LEFT-RIGHT to center, remove
C-E short and set HORIZ VOL TS/DIV to .1 V,
COLLECTOR.

5-26

Fig. 5·13. Typical displays of (A) correct, and (8) incorrect adjustment of Rl285.

®

Adjustment Procedure-577-01 or 02 Service
OPERATING LEVEL

NOTE

a. Connect the DC voltmeter (20 kQ/volt or greater)
between the flood-gun cathodes (pin 3 of P389, Fig. 7-4
and the Store Level test point, TP1. Record the voltmeter
read ing, so that if necessary, the operating level can be
returned to the original setting.

NOTE
If CRT performance has been satisfactory, adjustment of the Store Level control is not necessary.
Proceed to the Store Bal adjustment. For replacement
CRTs, an information card is provided to show the
optimum levels established by the factory for the
individual CRT. All voltage levels associated with
storage operation are made with respect to the
flood-gun cathodes.

c. Locate the Upper Writing Limit (maximum store
level) as follows:
(1) Again write about 3 lines per division.
check the stored lines and background for trace
or background fadeup. If no trace spreading or
evident after 10 seconds, adjust R 1250, Store
increase the operating level by 5 volts.

Carefully
spreading
fadeup is
Level, to

(2) Erase twice, wait 10 seconds, then write again and
check for spreading or fadeup.

(3) Repeat this procedure until spreading of about
0.025-inch, or background fadeup occurs. This is the Upper
Writing Limit. Note the voltage.

Reset the controls as follows:
HORIZ VOL TS/DIV
STEP FAMILY
REP
VARIABLE COLLECTOR %

Do not change the INTENSITY or FOCUS control
settings.

1 V, COLLECTOR
in
10 div of
horiz display

b. Locate the writing threshold (minimum store level) as
follows:
(1) Turn the INTENSITY control clockwise until the
trace starts to defocus rapidly. Press the ERASE button to
prepare the target for storage.

(2) Write about 3 lines per division across both targets
by slewing the free-running trace vertically using the
vertical POSITION control.

(3) Carefully check the written lines for breaks or gaps
of 0.025-inch or more. If no breaks or gaps are evident after
10 seconds, adjust R1350, Store Level, to reduce the
operating level by 5 volts.

(4) Erase twice, wait 10 seconds, then write again and
check for breaks or gaps.

(5) Repeat this procedure, decreasing the operating
voltage in 5-volt increments until breaks or gaps of about
0.025-inch occur. This is the writing threshold. Note the
voltage and rotate the Store Level control clockwise until
the original level, noted in part a, is reached.

d. ADJUST -R 1350 for an operating point midway
between the upper writing limit and writing threshold.

e. INTERACTION-Collimation and gain are affected if
the change in operating level is significant.

STORE BALANCE
a. Move the positive DC voltmeter lead from TP 1 to the
Store Bal Test Point, TP4.

b. ADJUST -R 1370, Store Bal, to set the store level to
the same voltage level as that recorded at TP 1.

COLLIMATION
a. Move the positive DC voltmeter lead from TP4 to the
CE 1 test point, TP3.

b. Write the entire screen by slowly positioning
trace vertically. If the screen fails to write, adjust
INTENSITY control slightly clockwise and repeat
process until the screen is fully written. Then turn
INTENSITY control fully counterclockwise.

the
the
the
the

c. Record the voltage at TP3.

d. With the screen fully written, turn R 1390, CE 1, fully
counterclockwise, noting that the bright area is Dulled in.

5-27

Adjustment Procedure-577-01 or 02 Service
e. ADJUST -CE 1 slowly clockwise until the bright area
is pulled in from the top and bottom graticule lines by
one-half major division at the top (see Fig. 5-14).

f. Erase the screen and disconnect the DC voltmeter.

g. INTERACTION-Display geometry (step 7) and storage capability (step 8) should be rechecked if a significant
change was made in the collimation voltage.

NON STORE
a. Fully write the entire screen by slowly positioning
the trace vertically.

b. ADJUST-R1395 , Non Store, so that the screen
erases in approximately 1 second when placed in the
non-store mode (STORE buttons out) . Repeat the step as
necessary to achieve correct adjustment of R 1395 .

STEP FAMILY
STEP/OFF
POLARITY
NORM
OFFSET
ZERO
AID (light
gray button)
DISPLAY FILTER
NORM
HORIZ VOL TS/DIV
Horizontal POSITION
VERTICAL CUR RENT/DIV
LEFT-RIGHT

SINGLE

out
out
in
out
200 V, COLLECTOR
centered
50 nA
Off (center)

b. Connect a patch cord from the base (B) to the
collector (C). right side jacks on the 177. Connect the DVM
between pin 4 of P129 (see Fig. 7-5) and the white-green
wire on the back of the MAX PEAK VOLTS switch .

If the VARIABLE COLLECTOR % control is not at
zero, lethal voltages may be present on the MAX
PEAK VOL TS switch.

9. Adjust Vertical Gain
a. Set the controls as follows:
MAX PEAK VOLTS
SERIES RESISTORS
COLLECTOR SUPPLY
POLARITY
VARIABLE COLLECTOR %
STEP/OF FSET AMPL

All Dark Gray Buttons and Knobs in except:

6.5
8k
+DC

c. Position the spot to the bottom-center graticule. Set
the LEFT-RIGHT switch to RIGHT and adjust the OFF SET MUL T control for a DVM reading of 4.00 volts.

o
0.5J.1A

d . ADJUST-R1116, Vertical Gain (on the display
unit). to move the spot one-half the remaining distance to
the top graticule line.

e. Switch the LEFT-RIGHT switch to center. Vertically
reposition the spot to the bottom graticule line. Set the
LEFT-RIGHT switch to RIGHT and repeat parts d and e.

10. Adjust Horizontal Amplifier Balance
a. Set the controls as follows:

Fig. 5·14. Illustration of Collimation adjustment.

5-28

MAX PEAK VOLTS
SERIES RESISTORS
VARIABLE COLLECTOR %
COLLECTOR SUPPLY
POLARITY

25
30 k

o
AC

REV C MAY 1980

Adjustment Procedure-577-01 or 02 Service
All Dark Gray Buttons and Knobs in except:
STEP FAMILY
SINGLE
STEP RATE
HORIZ VOL TS/DIV
VERTICAL CURRENT/DIV
Vertical POSITION
Horizontal POSITION
LEFT-RIGHT

press
SLOW
200 V, COLLECTOR

2A
centered
centered
RIGHT

VERTICAL CURRENT/DIV
HORIZ VOL TS/OIV
STEP/OFFSET AMPL
COLLECTOR SUPPY
POLARITY
LEFT-RIGHT

2A
50 mV, BASE
.1 VOLT
AC
RIGHT

b. Connect the DVM between the emitter (E) and base
(B) jacks, right side on the 177 Test Fixture.

b. Patch the base (B) and collector (C) to the emitter
(E) of the right-hand set of jacks on the 177.

c. Adjust the OFFSET MULT dial to 0.00. Position the
spot to left-center graticule. Note the DVM reading.

c. Position the spot to graticule center, using the
Horizontal POSITION control.

d. Adjust the OFFSET MUL T for 0.500 volt greater
than the DVM read ing in part c, and check the spot
position. The spot should be within ±0.05 division of the
right ( 10th) graticu Ie line.

d. Pull the Horizontal POSITION control to the out
position.

e. Reposition the spot to about graticule center, using
the Horizontal POSITION control.

f. Set the HORIZ VOL TS/DIV switch to 2 V, COLLECTOR.

e. ADJUST-R1136, Horiz Gain Adj (see Fig. 7-15 or
7-17 for location l. if the spot is not at the 10th graticule
line. Adjust R 1136 to bri ng the spot one-half the distance to
the 10th graticule line and repeat parts c through e until the
spot is at the 10th line at part d.

12. ADJUST Sensitivity Correction (D1 Only)
a. Set the controls as follows:

g. If the spot shifts: ADJUST -R530, Horiz Amp Bal, to
minimize spot shift while switching HORIZ VOL TS/DIV
from 20 V, COLLECTOR through 2 V, COLLECTOR. See
Fig. 7-6 for control location.

h. Check all other HOR IZ VOL TS/DIV, COLLECTOR,
positions for not more than 0.5 major division of horizontal
shift from the graticule centerline.

i. Push the Horizontal POSITION control to the in
position (magnifier off). Remove the patch cord to the
emitter, but leave the one between base and collector.

11. Adjust Horizontal Amplifier Gain

MAX PEAK VOLTS
SERIES RESISTORS
VARIABLE COLLECTOR %
COLLECTOR SUPPLY
POLARITY

6.5
.12
0

+

All Dark Gray Buttons and Knobs in except:
STEP FAMILY
HORIZ VOL TS/DIV
VERTICAL CURRENT/DIV

SINGLE
1 V, COLLECTOR
5mA

b. Vertically and horizontally position the spot to the
lower-left corner of the graticule.

a. Set the controls as follows:
All Dark Gray Buttons and Knobs in except:
STEP FAMILY
SINGLE
OFFSET
ZERO
AID (light
gray button)

REV.C.APR.1978

press

c. Push both STORE buttons and both Erase Selector
buttons in.
d. Push the ERASE button to erase the screen.

out
in

e. Set INTENSITY and FOCUS controls for a small,
focused spot.

5-29

Adjustment Procedure-571-01 or 02 Service
f. ADJUST -R 1385, Sens Corr, for minimum spot shift
while switching from store to non store (press and release
the UPPER and LOWER STORE buttons).

g. Horizontally position both spots on screen.

h. Decrease INTENSITY until the left spot disappears.

13. Adjust Horizontal Compensaton (do not
adjust unless out of tolerance)
a. Connect a 1 MD resistor (using clip leads) between
the right end of C306 and any terminal of R455, Amp Bal.
See Fig. 7 -6.

6.5
8k

o
AC

All Dark Gray Buttons and Knobs in except:
STEP RATE
STEP/OFFSET AMPL
NUMBER OF STEPS
OFFSET MULT
PULSED,300,us
Horizontal POSITION
Vertical POSITION
HORIZ VOL TS/DIV
VERTICAL CURRENT/DIV
LOOPING
COMPENSATION
Terminal Selector
LEFT-RIGHT

SLOW and FAST
2 VOLTS
10
0.00
in
centered
centered
50 V, COLLECTOR
2A
as is
EMITTER GROUNDED
BASE TERM,STEP GEN
Off

For 01 Only
BRIGHTNESS
VARIABLE COLLECTOR %

ccw
cw just far enough
to brighten the trace.
Adjust INTENSITY
as required

c. Short circuit B to C, right side.

d. Switch LEFT-RIGHT to RIGHT.

e. Reset INTENSITY as necessary to obtain two spots.

f. Pull X10 HORIZ MAG.

5-30

wire,

C503

(see

j. Reset STEP/OFFSET AMPL to .2 V and HORIZ
VOL TS/D IV to 50 mV.

k. Horizontally position the spot back on screen.

b. Set the controls as follows:
MAX PEAK VOLTS
SERIES RESISTORS
VARIABLE COLLECTOR %
COLLECTOR SUPPLY
POLARITY

i. ADJUST-Position the yellow
Fig. 7-6) for the smallest spot size.

I. ADJUST -C511 (see Fig. 7-6) for least slash, using an
insulated adjusting tool. Turn up INTENSITY as necessary
to see the slash.

m. Reset HORIZ VOLTS/DIV to .5V, COLLECTOR,
and STEP/OFFSET AMPL to 2 V.

n. CHECK-Slash should be less than 1 major division
(compromise the preceding adjustment, if necessary).

o. Reset HORIZ VOL TS/DIV to 20 mV, COLLECTOR,
and STEP/OFFSET AMPL to .1 V.

p. Horizontally position the spot back on screen.

q. CHECK-Slash should be less than 1 major division
(compromise the preceding adjustments, if necessary).

r. Shut off the ac power and remove the 1 MD resistor
and clip leads.

14. Adjust Step Generator Polarity Balance, Pulse
Zero, and Step Zero (see Fig. 7-6 for location of
controls and for remainder of tests)
a. Set the controls as follows:
MAX PEAK VOLTS
SERIES RESISTORS
VARIABLE COLLECTOR %
COLLECTOR SUPPLY
POLARITY
All Dark Gray Buttons
and Knobs

6.5
.12
0
AC
in

Adjustment Procedure-577-01 or 02 Service

PULSED, 300~s
NUMBER OF STEPS
STEP/OFFSET AMPL
HORIZ VOL TS/DIV
Horizontal POSITION
Vertical POSITION
VERTICAL CURRENT/DIV
LEFT-RIGHT
BRIGHTNESS (Dl)

in

ccw
2V
200 V, COLLECTOR
centered
centered
20mA
Off
clockwise

15. Adjust Polarity Positioning
a. Set the controls as follows:
MAX PEAK VOLTS
SERIES RESISTORS
VARIABLE COLLECTOR %
COLLECTOR SUPPLY
POLARITY

6.5
.12
0
AC

All Dark Gray Buttons and Knobs in except:
b. Horizontally position the spot to graticule center.

c. Pull the X10 HORIZ MAG and horizontally and
vertically reposition the spot to about graticule center.

d. Switch the HORIZ VOL TS/DIV switch to STEP
GEN X 10 and observe that one of the two spots displayed
(two spots are displayed only if the circuit is out of
calibration. One spot is much brighter than the other). If
the spot is small and well-defined with normal viewing
intensity, omit the Polarity Bal (R365), Pulse Zero (R355),
and Step Zero (R300) adjustments and proceed to part i.

If two spots are displayed, increase the INTENSITY to
determine which spot is the brighter.

e. ADJUST -R365, Polarity Bal, for equal deflection of
the brighter spot from the graticule center line while
pressing the STEP/OFFSET POLARITY button alternately
to the in and out positions.

STEP FAMILY
PULSED, 300~s
NUMBER OF STEPS
STEP/OFFSET AMPL
HORIZ VOL TS/OIV
Horizontal POSITION
Vertical POSITION
VERTICAL CURRENT/DIV

SINGLE
out

ccw
1 VOLT
200 V, COLLECTOR
centered
centered
2A

b. Horizontally and vertically position the spot to
graticule center.
c. Switch the COLLECTOR SUPPLY POLARITY to +.

d. ADJUST -R528, Horiz Pos Adj, and R570, Vert Pos
Adj, to position the spot to the lower-left corner of the
graticule.

e. Switch the COLLECTOR SUPPLY POLARITY to -.
The spot should Shift to the upper-right corner of the
graticule, within ±0.1 division.

f. ADJUST -R355, Pulse Zero, to position the brighter
spot to graticule center.

g. READJUST -R365, if necessary, and then repeat part

f. Switch the DISPLAY INVERT NORM button to
release the button to the out position. The spot should shift
to the lower-left graticule corner, within ±0.1 division.

f.

h. ADJUST -R300, Step Zero, to position the di~ spot
to graticule center.

i. Press STEP/OFFSET POLARITY NORM button in
and set the HORIZ VOL TS/DIV to .2 V, BASE.

j. ADJUST -R455, Amp Bal, to center the spot horizontally. Set HORIZ VOL TS/DIV to 5 mV, BASE.

k. READJUST -R455 to center the spot horizontally.

®

16. Adjust Step and Offset Amplitude
a. Set the controls as follows:
COLLECTOR SUPPLY
POLARITY
HORIZ VOL TS/DIV
Horizontal POSITION
Vertical POSITION

AC
1 V, BASE
centered
centered

All Dark Gray Buttons and Knobs in except:
STEP RATE
STEP/OFFSET AMPL
NUMBER OF STEPS

FAST
lV
10

5·31

Adjustment Procedure-577-01 or 02 Service

b. Observe a series of spots displayed horizontally.
Position the first spot to the left graticule line.

c. ADJUST-R278, Xl Step Amplitude, for approximately one spot per major division.

OFFSET MULT
STEP FAMILY
REP

1.00
in

n. Observe a series of spots displayed horizontally.
Position the first spot to the left graticule line.

d. Reset the controls as follows:
STEP FAMILY
SINGLE
OFFSET
ZERO
OFFSE, MULT
COLLECTOR SUPPLY
POLARITY

press
out
10.00

+
Remove Shorting Strap from C to B
e. Connect the DVM between Band E on the 177 Test
Fixture, right side. Switch the LEFT-RIGHT switch to
RIGHT.

f. ADJUST -R352, Offset Amplitude, for +10.00 volts,
±3 mV on the DVM.

g. Push the OFFSET AID button to release the button
to the out position.

h. Check for -10.00 volts, ±50 mV, on the DVM. If out
of specs, check that the + and - supplies are within 1/2% of
each other.

o. ADJUST -R281, X.l Step Amplitude; for approximately one spot per graticule division.

p. Reset the controls as follows:
STEP FAMILY
SINGLE
OFFSET
ZERO
COLLECTOR SUPPLY
POLARITY

press
out
+

q. Adjust OFFSET MUL T fora DVM reading ·of
1.00 volts, ±1 mV.

r. Pull the Xl0 HORIZ MAG and horizontally position
the spot to graticule center, or note the spot position.

s. Push the OFFSET ZERO button in and the STEP
FAMILY REP in.

t. READJUST-R281, to position the spot to graticule
center, or to the position noted in part r.
i. Push the AID button to the in position.

j. Pull the Xl0 HORIZ MAG and position the spot to
graticule center, or note the spot postion.

k. Push the OFFSET ZERO button in and the STEP
FAMILY REP button in.

I. READJUST-R278 to position the spot to graticule
center, or to the position noted in part j.

m. Reset the following controls:
STEP X.l
Xl0 HORIZ MAG
HORIZ VOL TS/DIV
COLLECTOR SUPPLY
POLARITY

5-32

out
in
.1V, BASE
AC

17. Adjust Step Generator Output Z
a. Set the controls as follows:
All Dark Gray Buttons and Knobs in except:
Xl0 VERT MAG
VERTICAL CURRENT/DIV
Vertical POSITION
NUMBER OF STEPS
STEP/OFFSET AMPL
VARIABLE COLLECTOR %
HORIZ VOL TS/DIV

out
50llA
centered

o
200 V, COLLECTOR

b. Connect a 1 kQ resistor between Band C terminals,
left side.

REV. B. FEB. 1975

Adjustment Procedure-577-Dl or D2 Service
c. Connect a 15 kS1 resistor between Band C terminals,
right side. Switch LEFT-RIGHT to LEFT.

e. Switch the LEFT-RIGHT switch alternately between
LEFT and RIGHT.

d. Adjust NUMBER OF STEPS for five displayed spots.
Note the vertical position of the fifth spot.

f. ADJUST -R456, Output Z, for no spot shift (fifth
spot) while switching between the 1 kS1 and 15 kS1
resistors.

REV. B, APR. 1978

5-33

Section 6-577-01 or 02 Service

REPLACEABLE
ELECTRICAL PARTS

PARTS ORDERING INFORMATION

Replacement parts are available from or through your local Tektronix. Inc. Field Office
or representative.
Changes to Tektronix instruments are sometimes made to accommodate Improved
components as they become available. and to give you the benefit of the latest circuit
improvements developed in our engineering department. It is therefore important. when
ordering parts. to include the following information in your order: Part number. instrument
type or number, serial number, and modification number if applicable.
If a part you have ordered has been replaced with a new or improved part. your local
Tektronix. Inc. Field Office or representative will contact you concerning any change in part
number.
Change information. if any. is located at the rear of this manual.

SPECIAL NOTES AND SYMBOLS
XOOO

Part first added at this serial number

OOX

Part removed after this serial number

ITEM NAME
In the Parts List. an Item Name is separated from the description by a colon (:).
Because of space limitations. an item Name may sometimes appear as incomplete. For
further Item Name identification. the U.S. Federal Cataloging Handbook H6-1 can be
utilized where possible.

ABBREVIATIONS
ACTR
ASSY
CAP
CER
CKT
COMP
CONN
ElCTlT
ElEC
INCAND
LED
NONWIR

REV 0, JAN 1979

ACTUATOR
ASSEMBLY
CAPACITOR
CERAMIC
CIRCUIT
COMPOSITION
CONNECTOR
ElECTROL YTiC
ELECTRICAL
INCANDESCENT
LIGHT EMITTmG DIODE
NON WIREWOUND

PlSTC
QTZ
RECP
RES
RF
SEl
SEMICOND
SENS
VAR
WW

XFMR
XTAl

PLASTIC
QUARTZ
RECEPTACLE
RESISTOR
RADIO FREQUENCY
SELECTED
SEMICONDUCTOR
SENSITIVE
VARIABLE
W1REWOUND
TRANSFORMER
CRYSTAL

6- 1

Replaceable Electrical Parts
577-01 or D2 Service

CROSS INDEX - MFA. CODE NUMBER TO MANUFACTURER
Mfr.
Code
00213

04099

Manufacturer
NYTRONICS C()Ip()NENTS GROUP INC
SUBSIDIARY OF NYTRONICS INC
SANfW.I) WESTON INC
COMPONENTS DIV
ALLEN-8RADLEY CO
TEXAS INSTRlJolENTS INC
SEMICONDLCTOR GROUP
CHERRY ELECTRICAL PRODUCTS CORP
IW4ILTON STANDARD CONTROLS INC
SPECTROL DIV
RCA CORP
SOLID STATE DIVISION
GENERAL ELECTRIC CO
SEMI -CONDUCTOR PROOOCTS DEPT
CAPCO INC

04222

AVX CERAMICS DIV OF AVX CORP

04713

MOTOROLA INC
SEMICONDUCTOR PRODUCTS SECTOR
ULTRONIX INC

00853
01121
01295
01963
02111
02735
03508

05347
05397

09353
10582
12697
12954

UNION CARBIDE CORP
MATERIALS SYSTEMS DIV
GENERAL INSTRUMENT CORP
GOVERNMENT SYSTEMS DIV
E-T-A CIRCUIT BREAKERS
FAIRCHILD SEMICONDUCTOR CORP
NORTH AMERICAN SAlES
SUB OF SCHLl.M3ERGER LTD MS 118
TRW INC
TRW IRC FIXED RESISTORS/BURLINGTON
BOURNS INSTRLMENTS INC
MAGNETICS DIV
GENERAL ELECTRIC CO
MINIATURE LAMP PRODUCTS DEPT
C AND K COMPONENTS INC
CTS OF ASHEVILLE INC
CLARDSTAT MFG CO INC
MICROSEMI CORP - SCOnSDALE

12969
14099
14193

UNITROOE CORP
SEMTECH CORP
CAL-R INC

14552
14752
14936

MICROSEMI CROP
ELECTRO CUBE INC
GENERAL INSTRUMENT CORP
DISCRETE SEMI CONDUCTOR DIV
SIGNETICS CORP
MILITARY PRODUCTS DIV
ILLINOIS TOOL WORKS INC
PAKTRON DIVISION
MEPCO/CENTRALAB
A NORTH N-1ERICAN PHILIPS CO
CORNING GLASS WORKS
STACKPOLE COMPONENTS CO
SUB OF THE STACKPOLE CORP
UNION CARBIDE CORP
ELECTRONICS DIV
ITT SCHAOOW INC
INTERSIL INC
SUB OF GENERAL ELECTRIC CO
BOURNS INC
TRIMPOT OIV

05828
06402
07263
07716
08116
08806

18324
19396
19701
24546
29604
31433
31918
32293
32997

6-2

Ad:fress

City. State. Zip Code

ORANGE ST

DARLINGTON SC 29532

SAI«3AMO RD
PO BOX 128
1201 SOUTH 2ND ST
13500 N CENTRAL EXP
PO BOX 655012
3600 SlfiSET AVE
17070 E GALE AVE
POBOX 1220
ROUTE 202

PICKENS SC 29671-9716
MILWAUKEE WI 53204-2410
DALLAS TX 75265

WAUKEGAN IL 60087-3214
CITY OF INDUSTRY CA 91749
SOMERVILLE NJ 08876

WGENESEE ST

AUBURN NY 13021

1326 WINTERS AVE
PO BOX 1028
19TH AVE SOUTH
POBOX 867
5005 E MCOOWELL RO

GRAND JUNCTION CO 81502
MYRTLE BEACH SC 29577
PHOENIX AZ 85008-4229
GRAND JUNCTION CO 81502

461 N 22ND ST
PO BOX 1090
11901 MADISON AVE

CLEVELAND OH 44101

600 W.IlHN ST

HICKSVILLE NY 11802

7400 N CRONJIIttE RD
10400 RIDGEVIEW CT

CHICAGO IL 60648-3902
CUPERTINO CA 95014

2850 MT PLEASANT AVE

BURLINGTON IA 52601

28151 I-WY 74
POBOX 139B
NELA PK

ROMOLAND CA 92380
CLEVELAND OH 44112

15 RIVERDALE AVE
MILLS GAP ROAD
LOWER WASHINGTON ST
8700 E TtlJMAS RD
POBOX 1390
5 FORBES RD
652 MITCHELL ROAD
1601 OLYMPIC BLVD
PO BOX 1397
2830 S FAIRVIEW ST
1710 S DEL MAR AVE
600 W.IlHN ST

NEWTON MA 02158-1057
SKYLAND NC 28776
OOVER NH 03820
SCOnSDALE AZ 85252

4130 S MARKET COURT

SACRAMENTO CA 95834-1222

1205 MCCONVILLE RD
PO BOX 4539
POBOX 760

LYNCHBURG VA 24502-4535
MINERAL WELLS TX 76067-0760

550 HIGH ST
PO BOX 14466

BRADFORO PA 16701-3737
RALEIGH NC 27610

HWY

276 SE
PO BOX 5928
8081 WAlLACE RD
10600 RIDGEVIEW COURT

GREENVILLE SC 29606

1200 COlLMBIA AVE

RIVERSIDE CA 92507-2114

LEXINGTON MA 02173-7305
NEWBURY PARK CA 91320-2211
SANTA I()NICA CA 90406
SANTA ANA CA 92704-5948
SAN GABRIEL CA 91776-3825
HICKSVILLE NY 11802

EDEN PRAIRIE MN 55344-2224
CUPERTINO CA 95014-0704

REV FEB .1988

Replaceable Electrical Parts
577-01 or D2 Service

CROSS INDEX - MFR. CODE NUMBER TO MANUFACTURER
Mfr.
Code
51406
51642
52763

MIIrufacturer
f4.RATA ERIE NORTH AMERICA INC
GElmIA OPERATIONS
CENTRE Ef6INEERING INC
STETINER ELECTRONICS INC

Id:tess
2200 IJ\KE PARK IRIVE

Ci!x.

2820 E COLLEGE AVE
6135 AIRWAYS BLVD
PO BOX 21947
12 HAR8lR PARK IR
12920 HE 125TH WAY
240 E PlATO BLVD

STATE COLLEGE PA 16801-7515
CHATTANOOGA TN 37421-:2970
PORT WASHINGTON NY 11550
KIRKLAND WA 98034-n16
ST PAUl. MN 55107-1609

92 HAYDEN AVE

LEXINGTON MA 02173-7929

6071 ST ANDREWS RD

COLUMBIA SC 29210-3319

16931 MILLIKEN AVE
11 DUNBARTON RD
PO BOX 4401
1142 WBEARDSLEY AVE
7741 N BUSINESS PARK DR
PO BOX 37144
7158 MERCHANT AVE

IRVINE CA 92713
OiERRY HILL NJ 08003-2107

57668
58224

TOK ELECTRONICS aRP
DEYOONG f!WIJFAC1lJRING INC
WILBRECHT ELECTRONICS INC
LEDCO DIV
SPRIGJE aECTRIC CO
BLD H£AIlQlJMTERS
MEPCO/CENTRALAB
A tmTH NolERICAN PHILIPS CO
R-

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1

2

3

4

5

6

7

8

9

10

A
B

c
o
E
F
1414-288

Fig _ 7-9. A 1 Main circuit board .

" 5ee Parts List for
serial number ranges_

CKT
NO

GRID
LOC

C201
C206
C215
C218
C231
C242
C264 "
C265
C268
C270 "
C273
C276
C279
C291
C293
C294
C29S
C297
C299
C306
C321 "
C332
C380
C382"
C383'
C384
C386
C391
C393
C396
C503
CSOS
CS07
C509
C511
CS13
C530
CS37
CS6B
CS69
CS70
CS77
CS91
C596

7E
7E
8E
8E
8B
9A
70
8E
7E
70
80
9C
8C
8B
7E
70
9B
10F
80
8B
7B
78
7C
5C
60
9C
9C
9E
9E
4C
2E
30
30
4E
4E
3E
5E
SE
4E
4E
SF
SF
9A
lOB

CR209
CR221
CR230"
CR234
CR241

8E
8C
88
88
8A

'Relocated to horizontal position switch _
'Relocated to vertical position switch.
tLocated on back of board_

REV JAN 1985

CKT
NO
CR259
CR277
CR278
CR322
CR326
CR330
CR384
CR386
CR391
CR393
CR429
CR436
CR438
CR439
CR440
CR441
CR441
CR4S2
CRS12
CRS13
CRS38
CRS40
CR568
CR569
CRS91
F391 "
K436
L579
0210
0212
0224
0234
0260
0262
0276
0276
0306
0310
0324
0330
0384
0436
0440
0450
0514
0594

GRID
LOC
8E
80
7B
8B
88
8C
9F
9E
90
90
8C
7E
7E
6E
6E
90
90
50
4E
4E
SE
SE
4F
4E
lOB

CKT
NO

R201
R202
R203
R204
R206
R208
R209
R211
R212
R213
R214
R215
R216
R218
R221
R222
R224
R22S
R227
R228
R230"
R231
R232
R234
R235
R237
F5
R241
R242
100 R244
R2S8
6E
R259
R261
8E
R262
8E
R263
9B
R264
BA R265
BE
R266
BE
R268
8C R269
8C R273
8C R274
9B R276
8B R278
8B R279
10C R281
100 R300
60 R303
50 R304
50 R30St ·
9B R308

GRID
LOC
7E
7E
7E
7E
7E
8E
8E
8E
8E
8E
8E
7E
70
7E
8E
7C
70
70
7C
7C
8B
88
8A
8B
8A
8A
8A
9A
9B
8E
8E
8E
8E
8E
8E
7E
70
7E
8E
8E
8C
8C
80
8C
7A
lOB
9B
9C
8B
98

CKT
NO
R310
R312
R313
R318
R319
R321
R322t
R323
R324
R326
R327 "
R329
R331
R332
R351
R352
R3S3
R3S4
R3S5
R356
R357
R3S8
R361
R362
R363
R364
R36S
R371
R372
R374
R375
R380
R381
R382 '
R387
R3B8
R389
R391
R393
R396
R397
R404
R405
R407
R408
R411
R412
R414
R41S
R417

GRID
LOC

CKT
NO

GRID
LOC

7C
78
8C
5B
5B
8B
7C
8B
9B
7A
8C
9B
78
78
SA
SA
78
6B
6C
68
6C
6C
7C
5B
60
5B
SC
SA
4A
3A
3A
6C
9C
9C
9C
6A
6A
48
SC
4B
4B
4C
4C
4C
4C
3C
3C
3C
3C
3C

R418
R421
R422
R424
R425
R426
R427
R430
R431
R432
R433
R434
R435
R438
R439
R440
R450
R451
R452
R453
R45S
R456
R457
R459
R501
R502
R511
RS12
R513
R514
R515
R517
R518
R519
R521
RS23
RS24
R526
R527
RS28
RS30
R531
R532
R534
RS36
RS37
RS38
R539
RS40
RS4S

3B
2C
2C
2B
2C
2C
2C
70
70
70
60
70
90
60
6E
7E
5C
4C
4C
SC
SC
60
60
6E
3E
3E
50
5C
40
50
5E
50
50
50
50
4E
4E
SE
SE
4E
6E
SE
SE
4E
4E
4E
SF
4E
SF
98

CKT
NO
R567
R568
R569
R570
R574'
R576
R577
R591
R592
R596
R597

GRID
LOC
5E
5E
5E
4C
3E
3E
3E
9A
9A
9B
9B

NOTE
LEAD CONFIGURATIONS AND CASE STYLES ARE TYPICAL, BUT MAY
VARY DUE TO VENDOR CHANGES OR INSTRUMENT MODIFICATIONS.

B
B

5310
5329t
5330t
5404
5426t
5428t
5429t
5430
5502
5S12t
5568t

6B
7B
78
3B
7C
7C
7A
SC
20
50
40

U206
U220
U230
U268
U270
U305
U350
U360
U380
U430
US20
U530
US70

7E
88
8B
70
80
9C
9C
6B
6C
70
SE
SE
SE

VR380" 9C
VR383 " 9C
WS34 "
WS74"

4E
3E

E
PL ASTI C·CASED TRANSISTORS

M ETA L ·CASEO TRANSISTORS

Index

1414-2 9
INTEG RATED CIRCUITS

Fig . 7-10. Sem iconductor l ead configurat ion for Main c i r cuit board .

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2

3

4

5

6

7

8

9

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A
B
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C1212
Cl224
C1227
C1236
C1241
C1242
C1248
C1249
C1251
C1252
C1253
C1254
C1258
C1259
C1272
C1273
C1274
C1279
C1281

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76
78
70
80
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7E
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90
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6C
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01104
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01264
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58
40
40
60
60
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6E
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Rll01
Rll02
Rl103
Rll04
Rll06

4C
2B
2C
26
26

·See Parts List for

serial number ranges.
Fig. 7-11. A5 Deflection Amplifier/ High Voltage ci rcuit board.

Id;u.II'I¥n~

REV JAN 1985

R1108
Rll12
Rll13
Rll14
Rll16
Rll17
Rll18
Rl122
R1123
R1124
R1125
R1126
R1127
R1128
Rl132
Rl133
Rl134
R1136
R1137
R1138
R1202
R1203
R1207
R1208
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R1222
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R1232
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R1236
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R1243
R1245
R1248
R1251
R1252
R1254
R1262
R1263
R1266
R1267
R1268
R1269
R1270
R1273
R1274
R1275
R1276
R1278
R1279
R1281
R1282
R1285
R1286
R1287

GRID CKT
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26
36
3C
38
2A
2A
3C
46
4C
36
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46
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GRID
LOC

T1240

96

VR1237
VRl258
VR1281
VR1282

50
90
56
5C

NOTE
LEAD CONFIGURATIONS AND CASE STYLES ARE TYPICAL, BUT MAY
VARY DUE TO VENDOR CHANGES OR /NSTRUMENT MODIFICATIONS.

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B

4C
5C
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4A
4A
4C
4C
3E
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3D
3D
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3E
40
40
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40
50
5C
60
6C
50
6C
6C
6A
7A
76
70
80
80
70
6E
70
6E
7C
6C
66
7B
6C
9A
7C
60
7C
7C
5C
5C
5B
5C

m
0

PLA ST1C·CASED TRAN SISTOR S

B
1 4 14-3 1
META L·CAS ED TR AN SISTORS

Fig. 7-12. Semiconductor lead configuration for Deflection Amplifier/ High Voltage circuit board.

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1

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NOTE
LEAD CONFIGURATIONS AND CASE STYLES ARE TYPICAL, BUT MAY
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A
B

B

B
PLASTIC·CASED TRANSISTORS

c
o

B

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1414-32
1414-33

Fig. 7-13. A4 Storage circuit board.

*See Parts List for
serial number ranges.

E

*See Parts List for
serial number ranges.
tRelocated at 5N 8050000

Fig. 7-14. Semiconductor lead configuration for Storage circuit board.
CKT
NO

GRID CKT
LOC NO

GRID CKT
LOC NO

GRID CKT
LOC NO

C1303
C1307
C1321
C1325
C1330
C1331
C1337
C1342
C1381
C1385
C1387
C1389
C1391
C1394
C1398
C1399

8C
68
4A
3A
3A
3A
4A
4B
5B
7B
6C
60
40
70
88
4C

CR1329
CR1332
CR1343
CR1351
CR1358
CR1386
CR1392

8A
4A
38
48
58
50
7A

01302
01304
01308
01310
01320
01334
01336
01356
01358

8C
68
68
4A
5A
4A
4A
58
58

01362
01364
01372
01384
01386
01388
01392
01396

68
6C
7B
7B
6C
5C
7A
6A

R1302
R1304
R1305
R1307
R1308
R1310
R1311

8C
7C
8C
5A
6B
6B
4B

R1312
R1313
R1321
R1322
R1324
R1329
R1330
R1332
R1334
R1336
R1337
R1339
R1341
R1342
R1343
R1346
R1347
R1350

GRID CKT
LOC NO

GRID CKT
LOC NO

GRID
LOC

5A
38
48
5A
3A
78
3A
5A
3A
4B
38
3A
48
38
38
48
4C
4C

5C
48
5B
4C
7C
7B
6C
6C
6A
6A
88
7C
7C
5C
50
60

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R1395
R1396
R1397

8C
7A
7C
7A
6A

51 3 30
51372
51 375

3A
3C
2B

VR1370
VR1387
VR1388
VR1396

7C
6C
50
78

R1351
R1354
R1355
R1359
R1364
R1365
R1370
R1371
R1381
R1382
R1384
R1385
R1386
R1387
R1388
R1389

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7

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9

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NOTE
LEAD CONFIGURATIONS AND CASE STYLES ARE TYPICAL, BUT MAY
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A

,m.

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B

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G

D

S

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C

o
B

E

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1414-34

*See Parts List for
serial number ranges.

Fig. 7-15. A6 Deflection Amplifier/High Voltage circuit board.

CKT
NO

GRID CKT
LOC NO

C1224
C1227
C1236
C1241
C1242
C1248
C1249
C1251
C1252
C1253
C1254
C1258
C1259
C1272
C1273
C1274

5D
4D
5E
68
68
78
78
70
80
8E
7E
BO
90
68
7C
6C

GRID CKT
LOC NO

GRID CKT
LaC NO

C1279
C1281

7C
5C

L1259

90

CR1204
CR1224
CR1239
CR1241
CR 1247
CR1255
CR1256
CR1256
CR1262
CR1264
CR1269

50
5C
88
88
90
8E
80
7E
60
60

01104
01106
01107
01114
01116
01117
01124
01126
01127
01134
01136
01137
01222
01226
01234
01252
01262

lA
2C
lA
3A
3C
38
3A
4C
38
5A

4D

DS1271 6A
DS1272 68
DS1273 78

4C

58
40
50
50
9E
6E

GRID CKT
LaC NO

01264
01278

60

Rll01
Rl102
Rll03
Rl104
R1106
R1108
R1112
R1113
R1114
R1116
Rll17
Rl118
Rl122
R1123
R1124

4C
28
2C
lA
28
2C
38
3C
3A
2A
2A
2C
48
48
38

6D

R1125
Rll26
Rl127
Rl128
R1 132
Rll33
R1134
R1136
R1137
Rl138
R1202
R1203
R1206
R1207
R1220
R1222
R1223

GRID CKT
LaC NO

GRID CKT
LaC NO

lC
48
3A

6C
50
5C
6D
5D
6C
6C
6C
6A
7A
70
70
70
6D
6E
70
60
6C

4C

5C
4A
4A
4A
4C

4C
3E
30
30
30
68
4E
40

R1226
Rl227
R1231
R1232
R1234
R1236
R1239
R1242
R1243
R1245
R1251
R1252
R1254
R1262
R1263
R1266
R1267
R1268

GRID CK'r
LaC NO

R1269
R1271
R1272
R1273
R1274
R1275
R1276
R1278
R1279
R1282
R12a5
R1286
R1287

6C
7C
7C
6A
6C
9A
7C
60
7C
5C
5C
48
5C

T1240

98

VR1237 50
VR1258 90

Fig. 7-16. Semiconductor lead configuration for Deflection Amplifier/ High Voltage circuit board.

GRID
LaC

VR12Bl 58
VR1282 5C

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$ II<.

vRI;$1 ~L*'
B2V ~

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5.1 \<

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.... SEE APRON
'
, ..,

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12

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P.1242
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T I2.40

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f? .00" e

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'2M

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+4 011

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14 1 - -- - - - - - - -•
1

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- 40V

1-"

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,_Go

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C- 12'51

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~

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+ sv

~

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1M

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AT aN &O&tA+o.vP

+~ V

R I'lIS
s," ~

( .. "1.- " )

QI278
G:D

~
05127

~m2.c.
w-QV

1'-n-~5

1

I
t-------i--+.::.w-v~~ ~
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1. . 2 M
<\OV

~I

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FOGU S
w- r

~ RI251
~ lOO k

CR-T C I R-CUIT ~

L I :t'l1

577-01 or 02 Service

1

2

4

3

6

5

7

8

1

A

A

B

B

c

c

o

o

E

E

2

3

4

6

5

7

8

C771

MALLORY

F

F
1414·36

Fig. 7·17 A. A3 Regulator circuit board SN B050000·up.

CKT
NO

GRID

C711
C716
C721
C724
C731
C733
C744
C757
C763
C767

3C
7A
lA
8E
3A
lC
58
5E
6F
lF

LOC

CKT
NO

GRID

C771
C772
C775
C781
C788

3E
40
6E
lE
BC

CR711
CR712
CR716
CR721

2C
7C
6C
3C

LOe

CKT
NO

GRID

CR722
CR724
CR731
CR732
CR741
CR742
CR743
CR744
CR751
CR754

18
80
4C
10
5A
5A
5A
6A
3C
5E

LOC

CKT
NO

GRID

cln

GRID

LOe

NO

LOe

CR755
CR767
CR773
CR781
CR785

5E
2E
50
20
6E

F711
F744

70
lC

R744

5A

R754
R755
R757
R761
R762
R763
R764
R765
R766
R772

lE
5E
5E
5E
5E
6F
6E
60
lF
6E

Fig. 7·178. A3 Regulator circuit board below SN B050000.

CKT
NO

GRID

R775
R776
R777
R781
R784
R785
R786
R787
R788

50
5E
6E
6E
60
40
4E
40
6C

LOe

CKT
NO

GRID

0754
0760
0772
0786

5F
5F
5C
60

VR772

CKT
NO

LOe

C711
C716
C721
C731
C733
C744
C751
C757
C763
C767
C771

50

REV JAN 1985

GRID

LOe
4C
88
2B
4B
2C
68
4E
6E
7E
2F
4F

eKT GRID
NO
LOC
C772
C773
C775
C781
C788

60
60
70
2E
80

CR711
CR712
CR716
CR721
CR722

3C
8C
7C
3C
28

eKT
NO
CR724
CR731
CR732
CR741
CR742
CR743
CR744
CR751
CR754
CR755
CR767

GRID

LOe
90
5C
20
6A
6A
6A
6A
4C
6E
6E
2E

CKT
NO

GRID

LOe

CR773
CR781
CR785

60
20
70

F714
F744

9C
2C

0754
0760
0766
0772

6F
6F
lE
6C

CKT
NO

GRID

LOe

0786
0788

70
10

R744
R754
R755
R757
R761
R762
R763
R764

6A
2E
6E
6E
5E
6E
7E
7E

CKT
NO
R765
R766
R772
R773
R774
R775
R776
R777
R781
R784
R785

GRID

LOe
7E
2F
70
70
7C
60
6E
70
7E
80
80

CKT
NO

GRID

lOe

R786
R787
R788

5E
50
70

U722
U732

lA
lC

VR772

60

9

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VOLT

HIt;H~
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)4+STEP AMP LOW /§,

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V OL T

I

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CR71&

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+52:"
NOTE:
+1 C71l:.

.. PENon:. ..

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~USIBLE RUN

~"

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COMMON

F721

bu.



P722-'jl

GND

R781
100

200

1ce2)1Q7 B8

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CR7~1

I

P7550 - 7

- 30 Y

P 7 30-9

-30v

)P7n-,

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VAC

--- ---

I
JI

P15iS - 9

L---------~----

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__~~______~--------------~~)P7 .0- S

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CRT HEATER
ELEVAT E b T O

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FOR

------

P75S- 4
P75S-5

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SELECTOR

1

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I
VOLTAGE

,

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)P722-~ +Sov

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SE L E.CTOR

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VALUES AND SERIAL NUMBER

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<§>

Section 8-577-01 or 02 Service

REPLACEABLE
MECHANICAL PARTS
PARTS ORDERING INFORMATION

INDENTATION SYSTEM

Replacement parts are available from or through your local
Tektronix, Inc. Field Office or representative.

This mechanical parts list is indented to indicate item
relationships. Following is an example of the indentation system
used in the description column.

Changes to Tektronix instruments are sometimes made to
accommodate improved components as they become available,
and to give you the benefit of the latest circuit improvements
developed in our engineering department. It is therefore
important, when ordering parts, to include the following
information in your order: Part number, instrument type or
number. serial number, and modification number if applicable.

12345

Detail Part of Assembly and/or Component
Attaching parts for Detail Part

If a part you have ordered has been replaced with a new or
improved part, your local Tektronix, Inc. Field Office or
representative will contact you concerning any change in part
number.
Change information, if any. is located at the rear of this
manual.

SPECIAL NOTES AND SYMBOLS
XOOO

Part first added at this serial number

OOX

Part removed after this serial number

Parts of Detail Part
Attaching parts for Parts of Detail Part

Attaching Parts always appear in the same indentation as
the item it mounts, while the detail parts are indented to the right.
Indented items are part of. and included with. the next higher
indentation. The separation symbol- - - • - - - indicates the end of
attach ing parts.
Attaching parts must be purchased separately. unles. otherwise
specified.

FIGURE AND INDEX NUMBERS
Items in this section are referenced by figure and index
numbers to the illustrations.

Name & Description

Assembly and/or Component
Attaching parts for Assembly and/or Component

ITEM NAME
In the Parts List, an Item Name is separated from the
description by a colon (:). Because of space limitations. an Item
Name may sometimes appear as incomplete. For further Item
Name identification. the U.S. Federal Cataloging Handbook H6-1
can be utilized where possible.

ABBREVIATIONS

•ACTR
ADPTR
ALIGN
AL
ASSEM
ASSY
ATTEN
AWG
BD
BRKT
BRS
BRZ
BSHG
CAB
CAP
CER
CHAS
CKT
COMP
CONN
COY
CPLG
CRT
OEG
DWR

INCH
NUMBER SIZE
ACTUATOR
ADAPTER
ALIGNMENT
ALUMINUM
ASSEMBLED
ASSEMBLY
ATTENUATOR
AMERICAN WIRE GAGE
BOARD
BRACKET
BRASS
BRONZE
BUSHING
CABINET
CAPACITOR
CERAMIC
CHASSIS
CIRCUIT
COMPOSITION
CONNECTOR
COVER
COUPLING
CATHODE RAY TUBE
DEGREE
DRAWER

REV C. JAN 1979

ELCTRN
ELEC
ELCTLT
ELEM
EPL
EOPT
EXT
FIL
FLEX
FLH
FLTR
FR
FSTNR
FT
FXD
GSKT
HDL
HEX
HEX HD
HEX SOC
HLCPS
HLEXT
HV
IC

10
IDE NT
IMPLR

ELECTRON
ELECTRICAL
ELECTROL VTIC
ELEMENT
ELECTRICAL PARTS LIST
EOUIPMENT
EXTERNAL
FILLISTER HEAD
FLEXIBLE
FLAT HEAD
FILTER
FRAME or FRONT
FASTENER
FOOT
FIXED
GASKET
HANDLE
HEXAGON
HEXAGONAL HEAD
HEXAGONAL SOCKET
HELICAL COMPRESSION
HELICAL EXTENSION
HIGH VOLTAGE
INTEGRATED CIRCUIT
INSIDE DIAMETER
IDENTIFICATION
IMPELLER

IN
INCAND
INSUL
INTL
LPHLDR
MACH
MECH
MTG
NIP
NON WIRE
OBD

00
OVH
PH BRZ
PL
PLSTC
PN
PNH
PWR
RCPT
RES
RGD
RLF
RTNR
SCH
SCOPE
SCR

INCH
INCANDESCENT
INSULATOR
INTERNAL
LAMPHOLDER
MACHINE
MECHANICAL
MOUNTING
NIPPLE
NOT WIRE WOUND
ORDER BY DESCRIPTION
OUTSIDE DIAMETER
OVAL HEAD
PHOSPHOR BRONZE
PLAIN or PLATE
PLASTIC
PART NUMBER
PAN HEAD
POWER
RECEPTACLE
RESI!>~OR

RIGID
RELIEF
RETAINER
SOCKET HEAD
OSCILLOSCOPE
SCREW

SE
SECT
SEMICOND
SHLD
SHLDR
SKT
SL
SLFLKG
SLVG
SPR
SO
SST
STL
SW
T
TERM
THD
THK
TNSN
TPG
TRH
V
VAR
WI
WSHR
XFMR
XSTR

SINGLE END
SECTION
SEMICONDUCTOR
SHIELD
SHOULDERED
SOCKET
SLIDE
SELF-LOCKING
SLEEVING
SPRING
SOUARE
STAINLESS STEEL
STEEL
SWITCH
TUBE
TERMINAL
THREAD
THICK
TENSION
TAPPING
TRUSS HEAD
VOLTAGE
VARIABLE
WITH
WASHER
TRANSFORMER
TRANSISTOR

8-1

Replaceable Mechanical Parts
577-Dl or D2 Service

CROSS INDEX - MFR. CODE NUMBER TO MANUFACTURER
Mfr.
Cede
00779
02735
05129
05469
05820
06383
07416
08261
09772
09922
11897
12136
12300
12327
12697
16428
22526
22670
24546
24931
63743
70318
70485
71590
71785
73743
75915
76854
77342
77900
78189
79136
80009
81350

83309
83385
83486
85471
86928
88797
93907
95238

8-2

Marufacturer
AMP INC
RCA CORP
SOLID STATE DIVISION
KILO ENGINEERING CO
BEARINGS INC

Pdress
2800 FULLING MILL
PO BOX 3608
ROUTE 202

21180 ST
3634 ELtLlD
POBOX 6925
EG AND G WAKEFIELD ENGINEERING
60 AUDlBON RD
PANIlJIT CORP
17301 RIDGELAND
NELSON NAME PLATE CO
3191 CASITAS
SPECTRA-STRIP AN arRA CO
7100 IJIoIPSON AVE
WEST COAST LOCKWASHER CO INC
16730 E JOHNSON DRIVE
POBOX 3588
BURNDY CORP
RICHARDS AVE
PLASTIGLIDE MFG CORP
2701 WEL SEGUNDO BLVD
P H C INDUSTRIES INC
1643 HADOON AVE
POTTER AND BRUMFIELD DIV
52 ROYAL RD
AMF CANADA LTO
POBOX 698
FREEYlAY CORP
9301 ALLEN DR
CLAROSTAT MFG CO INC
LOWER WASHINGTON ST
COOPER BELDEN ELECTRONIC WIRE AND CA NW N ST
SUB OF COOPER INDUSTRIES INC
DU PONT E I DE NEMOURS AND CO INC
515 FISHING CREEK RD
DU PONT CONNECTOR SYSTEMS
DIV MILITARY PROOUCTS GROUP
G M NAMEPLATE INC
2040 15TH AVE WEST
CORNING GLASS WORKS
550 HIGH ST
SPECIALTY CONNECTOR CO INC
2100 EARLYWOOD DR
PO BOX 547
WARD LEONARD ELECTRIC CO INC
31 SOUTH ST
ALLMETAL SCREW PRODUCTS CO INC
821 STEWART AVE
ATLANTIC INDIA RUBBER WORKS INC
571 WPOLK ST
MEPCO/CENTRALAB INC
HWY 20 W
A NORTH AMERICAN PHILIPS CO
POBOX 858
TRW INC
1501 MORSE AVE
TRW CINCH CONNECTORS DIV
FISCHER SPECIAL MFG CO
111 I NllJSTRIAL RD
LITTELFUSE TRACTOR INC
800 E NORTMST HWY
SUB TRACTOR INC
OAK SWITCH SYSTEMS INC
100 S ~IN ST
SUB OF OAK TECHNOLOGY INC
PO BOX 517
AMF INC
200 RICHLAND CREEK DR
POTTER AND BRUMFIELD DIV
SHAKEPRooF
SAINT CHARLES RD
DIV OF ILLINOIS TDOL WORKS
ILLINOIS TOOL WORKS INC
ST CHARLES ROAD
SHAKEPROOF DIV
WALDES KOHlNOR IN
47-16 AUSTEL PLACE
TEKTRONIX INC
14150 SW KARL BRAUN DR
PO BOX SOO MS 53-111
JOINT ARMY-NAVY SPECIFICATIONS,
PROMULGATED BY MILITARY DEPARTMENTS
UNDER AU'OORITY OF DEFENSE STANDARDIZATION ~UAL 4120 3-M
ELECTRICAL SPECIALITY CO
345 SWIFT AVE
SUBSIDIARY OF BELDEN CORP
MICRODOT MFG INC
3221 WBIG BEAVER RD
GREER-CENTRAL DIV
ELCO INDUSTRIES INC
1101 SAMUELSON RD
BOYD CORP
13885 R/lMJMA AVE
SEASTROM MFG CO INC
701 SOOORA AVE
ROBINTECH, INC., ELECTRO MECHANICAL 3421 VESTAL RD.
DIV.
TEXTRON INC
600 18TH AVE
CAMCAR DIV
CONTINENTAL CONNECTOR CORP
34-63 56TH ST

City. State. Zip Cede
HARRISBURG PA 17105
SOMERVILLE NJ 08876
LA VERNE CA 91750-5422
CLEVELAND OH 44101
WAKEFIELD MA 01880-1203
TINLEY PARK IL 07094-2917
LOS ANGELES CA 90039-2410
GARDEN GROVE CA 92642
CITY OF INDUSTRY CA 91744
NORWALK CT 06852
HAWTHORNE CA 90250-3318
CAMDEN NJ 08103-3109
GUELPH ONT CAN
CLEVELAND OH 44125-4632
OOVER NH 03820
RICHMOND IN 47374
NEW CUMBERLAND PA 17070-3007
SEATTLE WA 98119-2728
BRADFORD PA 16701-3737
FRANKLIN IN 46131
MOUNT VERNON NY 10550-1714
GARDEN CITY NY 11530-4810
CHICAOO IL 60607
FORT OOIlGE IA 50501
ELK GROVE VILLAGE IL 60007-5723
COLD SPRING KY 41076-9749
DES PLAINES IL 60016-3049
CRYSTAL LAKE IL 60014-6201
PRINCETON IN 47670-4771
ELGIN IL 60120
ELGIN IL 60120
LONG ISLAND CITY NY 11101-4402
BEAVERTON OR 97707-0001

SOUTH SAN FRANCISCO CA 94080-6206
TROY MI 48098
ROCKFORD IL 61101
CHINO CA 91710
GLENDALE CA 91201-2431
VESTAL. NY 13850
ROCKFORD IL 61101
WOODSIDE NY 11377-2121

REV FEB 1988

Replaceable Mechanical Parts
577-01 or 02 Service

CROSS INDEX - MFR. CODE NUMBER TO MANUFACTURER
Mfr.
Code
95987
53629
TK0392

TK0433
TK0435
TK0588

TK0858
TK0861
TK1582

WECKESSER CO INC
SCHLRTER N3 H
C/O PANEL IDIPONENTS CORP
NORl'tftST FASTENER SALES INC
PORTLAND SCREW CO
LEWIS SCREW CO
UNIVERSAL PRECISI~ PROOOCTS
STAUFFER SUPPLY CO
H SCHURTER N3 DIST PANEL C()\PONENTS
DELTA WEST CO

4444 WEST IRVING PARK RD
2015 SECOND STREET
7923 SW CIRRUS !RIVE
6520 N BASIN
4300 S RACINE AVE
1775 NW 216TH
105 SE TAYLIR
2015 SECOND STREET
7185 SW SANIEURG ST

City, State. Zip Code
OUctal IL 60641
BERKELEY lA 94170

BEAVERTON OR 97005-6448
PORTlAND OR 97217-3920

OiICAal IL 606m-3320
HILLSBORO OR 97123
PORTLAND OR 97214
BERKELEY CA 94170
TIGARD OR 97223

SUITE C

REV FEB 1988

8-3

Replaceable Mechanical Parts
577-01 or D2 Service
Fig. a
IndeK
Tektrurlx
No.
Part No.
H

Serlal/Assamly No.
Effecthe Ilsco1t

390-0322-00

1
3
3
3
3
3

214-~12-OO

-2
-3
-4
-5
-6

214-0603-01
214-0604-00
386-0227-00
386-0226-00
390-0321-00

-7
-8
-10
-11

214-0603-01
214-0604-00
386-0227-00
386-0226-00
361-0507-00

-12

212-0084-00 8010100

1

2
2
2
2
2
2

214-~12-OO

-9

Qty

8107089

2

212-0103-00 8107090

2

210-0004-00 8107090

2

212-0084-00 8010100

8107189

2

212-0103-00 8107190

2

8107190

2

210-~04-00

-13

361-0508-00

2

-14

212-OOOS-00

2

8-4

12345

Nane

a Description

COVER,SCOPE:LEFT SIDE
•FASTENER, PAWL:
.• PIN,SECURING:0.45 OIA X O.21,ZAMAK co PL
.• WASHER,SPR TNSN:0.26 10 X 0.47 OD,SST
.• STOP,CLP,RIM CL:
.• CLAMP,RIM CLENC:
COVER,SCOPE:RIGfT SIDE
. FASTENER, PAWL:
.• PIN,SECURING:0.45 OIA X O.21,ZAMAK co PL
.. WASHER,SPR TNSN:0.26 10 X 0.47 OD,SST
.• STOP,CLP,RIM CL:
.• CLAMP,RIM CLENC:
SPACER,CHASSIS:0.125 X 2.0 X0.5,AL
(ATIACHING PARTS)
SCREW,MACHINE:8-32 X 0.312,LGE HEX HD,STL
(01 ONLY)
SCREW,MACHINE:8-32 X 0.375,HEX HO,STL
(01 ONLY)
WASHER,FLAT:0.17 10 X 0.375 DO X0.032
(D1 ONLY)
SCREW,MACHINE:8-32 X 0.312,LGE HEX HD,STL
(02 ONLY)
SCREW,MACHINE:8-32 X 0.375,HEX HO,STL
(D2 ONLY)
WASHER,FLAT:0.17 ID X 0.375 00 X0.032
(02 ONLY)
(END ATIACHING PARTS)
SPACER,CHASSIS:0.25 X 1.5 X O.S,Al
(ATIACHING PARTS)
SCREW,MACHlNE:8-32 X 0.5,PNH,STL
(END ATIACHING PARTS)

Mfr.

B!de

MIT. Part No.

80009
80009
80009
80009

390-0322-00
214-an2-OO
214-c603-o1
214-0604-00
386-0227-00
386-0226-00
390-0321-00
214-0012-00
214-0603-01
214-0604-00
386-0227-00
386-0226-00
361-0507-00

80009
80009
80009
80009

80009

80009
80009

80009
80009

83385 ORDER 8Y OESCR
TK0858 ORDER BY OESCR
86928 76430-000
83385 ORDER BY OESCR

TK0858 ORDER 8Y OESCR
86928 76430-000
80009 361-0508-00
83385 ORDER 8Y DESCR

REV FEB 1988

SEE FIG.3
.REV DEC 1984

577·D1 or D2 CUR VE TRACER

577-D1 or D2 CURV E TRACER

REV DEC 1984

Replaceable Mechanical Parts

577-01 or 02 Service
Fig. ,.
Index
No.
2-1
-2

Part No.
200-0728-00
367-0116-00

-3
-4
-5

212-0597-00
386-1283-00
386-1624-00

4
2
2

-6
-7
-8
-9

-12
-13
-14
-15
-16
-17

200-1218-00
211-0188-00
354-0233-00
337-1440-00
337-1440-01
3S6-1946-00
348-0279-00
348-0070-01
348-0145-00
334-1379-00
337-1419-05
337-1420-00
354-0409-00

1
2
2
1
1
1
2
4
2
1
1
1
1

-IS
-19
-20
-21
-22

211-0632-00
343-0123-01
220-0444-00
211-0507-00
407-0922-00

1
2
1
2
1

-23

344-0226-00

1

-24

211-0587-00

-25
-26
-27

384-1064-00
358-0216-OQ
366-0494-00
213-0153-00
366-1023-01
213-0153-00
426-0681-00

----- ------ ----

1
1
2
2
1
1
5
I
I

210-0583-00
210-0046-00

2
1

200-0935-00 8070000
352-0157-00 8070000
378-0602-00 8070000

-34

----- -----

1
1
1
2

-35
-36
-37

210-0583-00
210-0940-00
210-0046-00

2
2
2

-38
-39

200-0608-00
333-1707-00 8010100
333-1707-01 8070000

8069999

-40

333-1706-00 8010100
333-1706-01 8070000

B069999

-10

-11

-28
-29
-30
-31
-32
-33

Tektronix

---- ---

SeriallAssadJly No.
Effect:he Dscant

~
2
1

1
1
1
1
1

-41
-42
-43

358-037S-OO
337-1421-00

I
1
1

-44

211-0504-00

3

-45

348-0115-00
348-0115-00

4
3

REV FEB 1988

12345 Nine ,. Descril!!:ion
COVER,HDL ENO:1.91 X 0.91 X 0.36 BLUE
HANDLE,CARRYING:16.54 L,BLUE VINYL
(ATTACHING PARTS)
SCREW,SHOULDER:10-32 X 0.55,0.5 RDH,STL
PLATE,It>L MTG:FRONT
PLATE,HDL RTNG:STAINLESS STEEL
(END ATTACHING PARTS)
RTNR,CRT SCAlE:6.814 X 5.125,NYLON
.SCREW,MACHINE:4-4O X 0.6,PNH,SST
.RING,RETAINING:TYPE E,EXT,U/O 0.14 DIA SFT
SHLD,IMPLOSION:
SHLD,IMPLOSION:GREEN
SUPPORT, CRT: FRONT
PAD,CUSHIONING:3.5 X 0.67 X O.l88,RUBBER
PAD,CUSHIONING:2.03 X 0.69 X O.lS SI RBR
GROt4ET ,PLASTIC:GRAY ,U SHAPE,O.48 ID
MARKER, I DENT :MI
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