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MODEL101A PRINTER

I:EnTROnll:S
. data computer corp.
MAY 1978
Centronics No. 37400020 Rev. K

HUDSON, NEW HAMPSHIRE 03051
TELEPHONE (603) 88_3 - 0111

MODEL 101A PRINTER
MAY 1978
REVJSION K

THE INFORMATION CONTAINEO HEREIN IS
PROPRIETARV AND IS NOT TO BE.RELEASED
OR REPRODUCED WITHOUT WRITTEN PERMiSSiON OF CENTRONICS data computer COJp.

I:EnTRDnl1:5
data computer corp.
HUDSON .. NEW HAMPSHIRE 03051
TELEPHONE (603) 883 - 0111

TABLE Of CONTENTS
Section
SECTION 1
INTRODUCTION
1.1
1.2
1.3

1.4
1.5

GENERAL DESCRIPTION (FIGURE 1-1).
lOGIC FLOW DIAGRAM (FIGURE 1-2) .
PRINTER OPERATION. . . . . . .
1.3.1 Character Printing (Figures 1-3, 1-4) .
1.3.2 Paper Movement (Figure 1-5). .
SPECIfICATIONS SUMMARY.
PHYSICAL DESCRIPTION

· 1-2
· 1-2
·

.
·

.

1-3
. 1-3

· 1-4
· 1-5
. 1-7

SECTIONS 2 AND 3
INSTALLATION AND OPERATION
·2.1
2.2
2.3

SITE PREPARATION (FIGURE 2-1). .
SHIPPING CRATE. . . • . . .
PAPER GUIDE AND STACKER ASSEMBLY.

· 2.. 1
· 2-2
•

• 2.. 3/2-4

SECTION 4
THEORY OF OPERATION
4.1
4.2
4.3

4.4

INTRODUCTION (FIGURES 4-1 AND 4-2) · · .
BASIC TIMING (SEE FIGURE 4-3). ·
INITIALIZING THE PRINTER · ·
· · ·
4.3.1 Prime Circuit (Figure 4-4, Timing; Figure 4-5,
Circuit). . . . . • .
· · ·
4.3.2 Select Circuit (Figure 4-6). ·

·

· 4-1
· 4-3
· 4-3

·

·

·
LOADING DATA . . . . · · ·
· · · ·
4.4.1 . General (Figure 4-7/4-8). ·
· · ·
·
4.4.2 Data Strobe . . · · · · ·
·
·
4.4.3 Acknowledge (Figure 4-9).
. · · ·
·
-i-

· 4-4
· 4-6
· 4-9
· 4-9
4-9
· 4-12

--REV. J

TABLE OF CONTENTS (cont'd)
Section
4.4.4
4.4.5
4.4.6
4.5

. 4-12
. 4-14
. 4-16

CHARACTER PRINTING (FIGURE 4-13) .
4.5.1
4.5.2
4.5.3
4.5.4
4.5.5
4.5.6
4.5.7

4.6

Busy Timing (Figure 4-10, Timing; Figure 4-11,
Circuit) • . . . . . . . . . .
Clocking Input Data into the Buffer (Figure
4-7, 4-12). . . . . . .
Function Decoder (Figure 4-12) .

·

4-17

Initiating the'Printing Operation (Figure 4-14)"".
Print Head Motion (Figure 4~14; Schemattc Section 7). . . . . . . . . . . . . .
Character Registration and Timing (Figure 4-15,
Timing; Figure 4-16, Circuit) . ' . .'
Character Generator (ROM - Figure.4-16)
.
Print Head Operation (Figures 4-18, 4-19).
.
Power Driver Circuits (Schematic, 'Section 7) . .
Terminating the Printing Operation.
.

4-17
4-19
4-19
4-23
4-24
4-26
4-27

PAPER MOVEMENT .
· 4-28
4.6.1 tine Feed (Figure 4-21, Circuit; Figure 4-22,
Timing) .
·
· Figure
· · 4-24,·
· 4-28
· . 4-2~r, Circuit;
4.6.2 Form Feed ·(Figure
.
Timi ng) . · ·
4-30
· . · · Figure
· · 4-24;
· .
4.6.3 Vertical Tab (Figure 4-23, Circuit;
Timi ng) . · · . . .
. .- . 4-32
Unit . · . · · · ·,;.'
4.6.4 Vertical Format
4-33
',,4-34
4.6.5 Paper Time Out Circuit. (Figure 4-21) '. ." ··
4.6.6 Line Feed Solenoid Driver (Schematic - Section 7). 4-34
~

.
4.7

4.8

REV. J

SPECIAL
4.7.1
4.7.2
4.7.3
4.7.4
4.7.5

FUNCTIONS.
Bell (Figure 4-.25) .
Delete
. . . . ". .
Paper Empty (Figure 4-26).
Motor Control (Optiopal). .
Fault Circuit (Figure 4-30)

· 4-34
· 4-34
4-34
· 4-36
· 4-36
· 4-40

·

,

POWER SUPPLIES (FIGURE 4-31, SCHEMATICS -.SECTION. 7)

.

. 4-40

4.8.1 +5V Regulator (Schematic #63011143) . . . .
4.8.2+12V and.-12V Regulptors (Schematic #63002308).
4.8.3 +35V Power Supply, Unregulated.
..

· 4-43
· 4-44
· 4-44

-ii-

TABLE OF CONTENTS (cont'd)
Section
SECTION 5
REMOVAL, REPLACEM~NT AND ADJUSTMENT PROCEDURES
5.1
5.2

INTRODUCTION.
MECHANICAL ASSEMBLIES.
5.2.1 Cover (Figure A). . . . . .
5.2.2 Carriage Mechanism (Figure HA). . . . . .
5.2.3 Driving Mechanism (Figure 8-4 and Figure 8-5).
5.2.4 Spring Drum (Figure HC) .
5.2.5 Damper (Figure HD) .
5.2.6 Frame (Figure HE) . . .
5.2.7 Paper Feed Mechanism (Figure HF) .
5.2.8 Pin Feed Unit (Figure 8-8) HG .
5.2.9 Form Feed Mechanism (Figure HH).
5.2.10 Ribbon Feed Mechanism (Figure HI) .
5.2.11 Electrical Hardware (HJ) .
5.2.12 Paper Stacker and Guide . .
5:2.13 Print Head and Associated Assemblies.

·
.
.
.
.
.
.
.
.
.
.
.
.
.

5-1
5-1
5-1
5-2
5-6
5-16
5-17
5-18
5-24
5-26
5-31
5-35
5-44
5-45
5-45

SECTION 6
MAINTENANCE
6.1

6.2
6.3
6.4
6.5

ELECTRICAL ADJUSTMENTS (MODEL 101/101A).

· 6-1

6.1.1

· 6-1

Video Amplifier Adjustment (Series 100)

MECHANICAL ADJUSTMENTS .
PREVENTIVE MAINTENANCE (P.M.) .
TROUBLESHOOTING GUIDE
RECOMMENDED TOOLS.

·
·
·
·

6-2
6-2
6-4
6-6

SECTION 7
ELECTRICAL DRAWINGS lAND LISTS OF MATERIALS

· 7-1

SECTION 8
DRAWINGS AND PARTS LISTS, MECHANICAL .

· 8-1

-iii-

REV. J

LIST OF ILLUSTRATIONS
Figure
1-1
1-2

1-3
1-4
1-5
1-6
1-7
1-8
1-9
2-1

4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-8

4-9
4-10
4-11
4-12

4-13
4-14
4-15
4-16
4-17
4-18
4-19
4-20
4-21

REV. J

Page
Model lOlA Printer (Front Cover Removed).
Basic Block Diagram.
Printing the Letter (H)
Print Head Components .
Paper Movement Mechanism.
Left Front View of lOlA Printer.
Right Front View of lOlA Printer .
Rear View of lOlA Printer.
Rear View (lOlA Electronics Cavity Removed).
Printer Dimensions .
Model lOlA Functional Block Diagram .
Functional Flow Chart .
Basic Timing Circuit .
Prime Timing .
Prime Circuit.
Select Circuit .
Input Data Timing - No Busy Condition.
Data Input Circuit .
Acknowledge Circuit.
Input Data Causing Busy .
Busy Circuit.
Function Decoder.
Character Printing Block Diagram .
Forward and Reverse Clutch Drive Circuits
Character Timing.
Character Registration and Timing Circuit .
Normal and Elongated Characters.
Solenoid Positions, 1 through 7.
Print Head Timing
Power Driver Waveform .
Line Feed Circuit .
-iv-

· 1-2

·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·

1-3
1-4
1-4
1-4
1-8
1-8
1-9/1-10
1-9/1-10
2-1
4-1
4-2
4-3
4-4
4-5
4-7
4-9
4-10
4-11
4-12
4-13
4-15
4-17

· 4-18

·
·
·
·
·
·
·

4-20
4-21
4-24
4-25
4-25
4-26
4-29

LIST OF ILLUSTRATIONS (cont'd)
Figure
4-22 .
4-23
4-24
4-25
4-26
4-27
4-28
4-29
4-30
4-31
5-1
5-2

5-3
5-4
5-5

5-6
5-7
5-8
5-9
5-10
5-11
5-12
5-13
5-14
5-15
5-16
5-17
5-18
7-1

Page
Line Feed Timing.
Form Feed and Vertical Tab Circuit.
..
Form Feed and Vertical Tab Timing
Bell Circuit.
Paper Empty .
Motor Control Mounting.
Motor Control Board Interconnection Diagram.
Motor Control Timing
Fault Circuit.
Power Distribution Diagram .
Series 101 Drive Train.
Main Motor Drive and Drive Belt Arrangements
Determining Backlash Adjustments, Shaft (HB-27)
Use of Feeler Gauge for Backlash Adjustment, (HB-30,22)
Bushing End-Play Adjustment for Preload Clutch Shaft
(HB-50) .
Flexible Timing Fence Mounting, Series 101 .
Fence Adjustment 'and Optic Housing.
Vertical and Horizontal Alinement of Single Channel
Optics Housing
Location of Left Reed Switch (Top View) .
Removal of Belt (32) Idler Slide (28), and Drive
Pulley (26)
Adjustment for Paper Holder Gate .
Maintaining 5/8-in. (15.9 mm) Nominal Print Margin .
Two Adjustments, Gear with Stop Cam (HH-23) and
Inside CAM (HH-14) .
Ribbon Feed Mechanism (Rear of Printer, Left Side)
Backlash Adjustment, Bevel Gear (HI-43, 59) .
Driving Slide Shaft A - Adjustment.
Ribbon Reversing Rod Adjustment
Ribbon Reverse Timing .
Schematic Diagram, Electronic' Card #1 (Sheet 1 of 2).

-v-

4-30
4-31
4-32
4-35
4-37
4-38
4-38
4-40
4-41
4-42
5-6
5-8
5-14
5-14
5-16
5-20
5-21
5-22
5-23
5-28
5-29
5-30
5-345-40
5-41
5-41
5-42
5-43
7-1

REV. J

LIST OF ILLUSTRATIONS (cont'd)
Page

Figure
7-2
7-3
7-4
7-5
7-6
7-7
7-8
7-9
7-10
7-11
7-12
7-13
7-14
7-15
7-16
7-17
7-18
7-19
7-20
7-21
7-22
7-23
7-24
7-25
7-26
7-27
7-28
7-29
8-1
8-2
8-3

REV. J

Schematic Diagram, Electronic Card #1 (Sheet 2 of 3).
Schematic Diagram, Electronic Card #1 (Sheet 3 of 3).
Schematic Diagram, Electronic Card #2 (Sheet 1 of 3).
Schematic Diagram, Electronic Card #2 (Sheet 2 of 3).
Schematic Diagram, Electronic Card #2 (Sheet 3 of 3).
Schematic Diagram, Power Driver Board (Sheet 1 of 2).
Schematic Diagram, Power Driver Board (Sheet 2 of 2).
Schematic Diagram, Video Amplifier.
Schematic Diagram, +5V Volt Regulator.
Schematic Diagram, !12 V~lt Regulator.
Multitap 50/60 Hz Transformer .
Wiring Diagram, Printer Mechanism .
Interconnection Diagram, Connector Board.
Schematic Diagram, Motor Control (Optional).
Schematic Diagram, LED Tape Reader (Optional) .
Component Board Assembly, Electronic Card ,#1
Component Board Assembly, Electronic Card #2 .
Component Board Assembly, Power Driver Board .
Component Board Assembly, Video Amplifier .
Component Board Assembly, +5 Volt Regulator.
Component Board Assembly, ~12V Regulator
Component Board Assembly, Connector Card
Component Board Assembly, Motor Control (Optional)
"
Harness Assembly, Motor Control.
Electronic C~vity Assembly
WI Harness Assembly
W2 Cable Assembly, Computer Input
W3 Power Cable Assembly
Mechanical Subassemblies Series 101
Cover Assembly - A .
Carriage Mechanism - HA

-vi-

7-3
7-4
7-5
7-6
7-7
7-8
7-9
7-10
7-11
7-12
7~13

7-14
7-15
7-16
7-17/7-18
7-19
7-21
7-23
7-25
7-27
7-29
7-31
7-33
7-35
7-37
7-39
7-41
7-43
8-3
8-5
8-7

LIST OF ILLUSTRATIONS {cont'd}
Figure
8-4
8-5
8-6

8-7
8-8
8-9
8-10
8-11
8-12
8-13
8-14

Page
Drive Mechanism - HB (Part 1), Series 101.
. . 8-9
Drive Mechanism (Preload Clutches)(Part 2), Series 101 . 8-11
Spring Drum - HC
8-13
Damper - HD.
· . 8-15
Frame - HE .
· . 8-17
Paper Feed Mechanism ..
· . 8-19
Pin Feed Mechanism (Left and Right) - HG .
· . 8-21
Form Feed Mechanism - HH
8-23
Ribbon Feed Mechanism - HI.
· . 8-25
Electrical Hardware - HJ
· . 8-27
Print Head and Associated Assemblies
· . 8-28

Note
Refer to the Engineering Change Notice
(ECN) sheets shipped with the printer
for changes made to the printer which
have not yet been incorporated into the
drawings in this technical manual. Always keep these Engineering Change
Notice sheets with the manual.

-vii-

REV. J

SECTION 1
INTRODUCTION
This manual describes-the Model lOlA printer, manufactured by
Centronics Data Computer Corporation. It provides general information,
detailed theory qf operation and maintenance information enabling field
service personnel to service the printer. For serial input or other detailed interface infonmation, a separate document for each interface is
published for your reference.
The manual is subdivided into eight sections, each with its
specific purpose.
Section 1

INTRODUCTION, introduces the reader to the scope
and content of the manual, and provides the reader
with a general description of the printer.

Section 2

INSTALLATION, contains unpacking and installation
instructions for the printer.

Section 3

OPERATION, describes the use of all operator controls and indicators.

Section 4

THEORY OF OPERATION, contains a detailed description of each major operation performed by the
printer electronics, including flow charts, timing
diagrams and circuit diagrams.

Section 5

REMOVAL, REPLACEMENT AND ADJUSTMENT PROCEDURES,
includes step-by-step removal and replacement procedures for all major assemblies and sub-assemblies
in the printer.

Section 6

MAINTENANCE, includes electrical adjustments, preventive maintenance procedures, and a troubleshooting guide.

Section 7

ELECTRICAL DRAWINGS AND LIST OF MATERIALS, contains
a complete set of schematic, wiring and component
board layout diagrams and their associated list of
materials for the electrical portion of the printer.

Section 8

MECHANICAL DRAWINGS AND PARTS LISTS, includes all
printer assembly drawings and their associated parts
lists for the mechanical portion of the printer.

Appendices

-

(A) Signal Glossary
Parallel Interface Specifications

(8)

1-1

REV. J

1.1 GENERAL DESCRIPTION (FIGURE 1-1)
The Model lOlA printer is a medium speed impact printer which
uses a 9 x 7 dot matrix for character generation.

Figure 1-1.

MODEL lOlA PRINTER (FRONT COVER REMOVED)

The unit prints at a rate of 165 characters per second, which is
approximately one full 132-character line per second (including carriage
return time). Paper is sprocket-fed, and paper widths from 4 inches to
14-7/8 inches can be accommodated. The printer can produce one original
and four copies. Standard print format consists of 10 characters per inch
horizontally and 6 lines per inch vertically.
1.2 LOGIC FLOW DIAGRAM (FIGURE 1-2)

I

The standard printer contains a 132-character buffer. For serial
data inputs, optional serial interfaces allow data to be rece~ved at rates
from 100 to 9600 baud. Several other optional interfaces are available as
requ i red by the user'.
Once a line of printable characters is stored in the buffer, head
motion is initiated by activating the forward clutch, causing the print head
to move from left to right across the paper. With the head in motion, data
is transmitted from the buffer to the character generator. From there,
character write pulses are sent to the driver circuits, which energize the
print head solenoids causing the print wires to form the characters on the
paper.

REV. J

1-2

CONTROL
1.
DATA
INPUT

2.
3.

PRINT COMMAND
(CR OR LAST CHAR.)
PAPER MOVEMENT
(LF, VT, FF)
SPECIAL FUNCTIONS
(BELL, DELETE, EXP.
CHAR)

HEAD MOTION
CONTROL

CLUTCH

PAPER MOTION
CONTROL

PAPER
MOVEMENT
SOLENOID

TIMING

WRITE
PULSES

MEMORY

PRINT
HEAD

Figure 1-2 BASIC BLOCK DIAGRAM
Paper movement is initiated by a line feed, vertical tab and form
feed function. Vertical forms movement is hardware-controlled by a vertical
format unit (VFU) which controls vertical spacing by monitoring two
channels in a punched paper tape.
In addition, the printer recognizes the following special control
codes: bell, delete and elongated character, as described in Section 1.3.3.
1.3 PRINTER OPERATION
Basically, all printer' functions can be grouped into one of the
following three categories: 1) character printing, 2) paper movement, and
3) other auxiliary functions such as bell, delete, etc.
1.3.1 CHARACTER PRINTING (FIGURES 1-3, 1-4)
A small aluminum carriage supports the print head assembly. During
printing operation, the carriage travels along the print line from left to
right. Printing is accomplished by selectively firing the print wires as
the print head moves from left to right across the print line. Printing impulses energize the print solenoids and drive the print wires against the
ribbon, paper and platen to form the characters in a dot matrix pattern.
When the solenoids are de-energized, the wires are withdrawn so they are
flush with the surface of the jewel. Each solenoid can fire independently
up to fives times for anyone character. Figure 1-3 shows an example of the
dot matrix forming the letter H. Character formations for the standard 64
ASCII set are shown in the Series 100 Operators Manual. Other available character sets are shown in Printer Character Sets brochure (No. C332-20).

1-3

REV. J

JEWEL
PRINT WIRES
A~

A

PRINT
HEAD
JEWEL

Figure 1-3. PRINTING THE LETTER (H)

Figure 1-4.

PRINT HEAD COMPONENTS

The print head (Figure 1-4) consists of the jewel, casting and
seven solenoids with attached print wires. The seven print solenoids and
their attached print wires are arranged radially around the print head. The
free ends of the print wires pass through a wire guide at the front of the
print head, which properly spaces the wires so that the correct wires pass
through the correct hole in the print jewel.
Printing action is initiated when the input buffer has been filled
or a carriage return (CR) code has been received. The print head then sweeps
across the page until a CR command is decoded at the buffer output or the
head reaches the 132-column limit switch. At this time, the print head returns
to the left margin and an automatic line feed is performed. As an option, the
automatic line feed can be disabled.
1.3.2 PAPER MOVEMENT (FIGURE 1-5)
Paper can be moved manually by rotating the platen knob or automatically by any of three paper movement commands: line feed, vertical tab
and form feed.
PAPER
ADVANCE

,--

/

FORM FEED
HOLE

Figure 1-5.
REV~

J

PAPER MOVEMENT MECHANISM
1-4

1.4 SPECIFICATIONS SUMMARY
Data Input
Data Format

7-bit parallel interface
8 bits (optional)
64-character ASCII
Up to 75,000 characters/second
One-line character buffer
Data Strobe is normally gated with
acknowledge of previous character.
Non-gated strobe available as an
option.

Input Code
Data Rate
Buffer
Input Gating

Printing
Printing Method
Dot Matrix
Elongated Characters

Impact, character-by-character
9 x 7 (std.), 5 x 7 (opt.)
By line, via octal 016
By character, via bit 8 (opt.)
10 characters/inch (horizontal)
132 characters/line (max.)
165 characters per second
Prints original and up to four carbon
copies.
Standard 64-character ASCII, lower case
prints as upper case. Optional sets up
to 128 characters, available.

Character Density
Print Format
Print Rate
Number of Copies
Character Set

Paper Advance
4 inches/second
6 lines/inch (Std.)
8 or 10 lines/inch (Opt.)
2-channel VFU paper tape
Rear Paper Feed
Paper Runaway Inhibit
Sprocket feed, adjustable to 14-7/8
inch paper
Automatic line feed on carriage return.
Disabled by option.
Controlled by VFU tape, causes paper
to advance to top of form.

Slew Rate
Vertical Format
Vertical Format Control
Paper Entry
Paper Timeout
Paper Feed
Auto Line Feed
Bottom of Form (Opt.)

1-5

REV. J

Controls/Indicators.
Switches

ON/OFF, SELECT, FORMS OVERRIDE,
TOP OF FORM, MANUAL LF
ON/OFF, SELECT, PAPER OUT
Forms Thickness, Paper Advance Knob
Drive motor automatically turns off
and on as required by the incoming data.
Momentarily sounds a buzzer in response
to a Bell code or paper empty condition.

Indicators
Manual Controls
Auto Motor Control (Opt.)
Audio Alarm

Physical/Environmental/Electrical
inches
20 inches
27-3/4 inches
118 pounds
40~ to 100~F (operating)
-40 to 160 F (storage)
115 VAC!10%, 60 Hz (Std.)
230 VAC±10%, 50 Hz (Opt.)

Height
Depth
Wide
Weight
Temperature

11~

Input Voltage

Other Options
Serial Communications Interface
Popular Parallel Computer Interfaces
Ribbons
spools.

The printer uses a I-inch nylon ribbon mounted on 3-inch diameter
The following four colors are available:
Black
Red
Green
Blue

REV. J

-

Part
Part
Part
Part

No.
No.
No.
No.

63002293-5001
63002293-5002
63002293-5003
63002293-5004

1-6

Ribbons (cont'd)
Note
centronics' nylon ribbons are designed.
specifically for use in Centronics' matrix
printers. The fabric design and proprietary
ink formulation ensures optimum print quality,
as well as long print head and ribbon life.
Centronics reserves the right to void the
warranty with regard to any parts damaged
through the use of non-qualified ribbons.

Paper
The printer uses continuous form paper with standard feed holes on
each edge. Paper widths from 4 to 14-7/8 inches can be accommodated by the
printer. Using multiple-part form, one original and up to 4 copies can be
printed, all very legible. Paper weight specifications are as follows:
Single-Part Forms:
Multiple-Part Forms:
Carbon Paper:

15 to·12 lb
Original - 12 to 15 lb
Copies - 9 to 12 lb, last copy 15 lb
(Maximum of five parts)
7~ lb with medium hardness

1.5 PHYSICAL DESCRIPTION
The printer is approximately 11~" high by 20" deep by 27-3/4/1
wide, and weighs approximately 118 pounds.
Figures 1-6 to 1-9 show various photographic views of the
printer taken with the covers removed. All major assemblies and components
are identified in the table below the photo.

1-7

REV. J

1. Print Head Assembly
2. Carriage .
3. Form Feed Mechanism

4. VFU Tape Reader
5. Pin Feed Mechanism
6. Ribbon Feed Mechanism

7. Spring Drum
8. Platen Knob
9. Damper

10.
11.

Timing Fence
Main Drive Belt

Figure 1-6. LEFT FRONT VIEW OF 101A PRINTER

1.
2.
3.
4.

Operator Control Panel
Form Feed Motor
Video Amplifier & Cable Ass'y
Optic Block

5.
6.
7.
8.

Ribbon Cable
Power Driver Board
Penetration Control Knob
Forward Clutch

9.
10.
11.
12.
13.

Main Pulley & Drive Belt
Reverse Clutch
Cooling Ran
Ribbon Feed Mechanism
Line Feed Switch

Figure 1-7. RIGHT FRONT VIEW OF 101A PRINTER

REV. J

. 1-8

3

/;

I,'.
,

.
i.

1. Electronics Cavity
2. Electronic Card 1
3. Electronic Card 2

4. +5VDC Power Supply
5. +12VDC Power Supply
6. +30 Volt Power Supply

Figure 1-8.

1. Main Motor
2. Motor Starting Capacitor
3. AC Power Connector

7. Input Connector
8. Speaker
9. AC Power Input

10.
11.

'~~I

Fuses
In-Line Fuse

REAR VIEW OF 101A PRINTER

4. Electronics Connector
5. Power Transformer
6. Power Distribution

7. Ribbon Reversing Rod
8. Ribbon Drive Rod

Figure 1-9. REAR VIEW (101A ELECTRONICS CAVITY REMOVED)

1-9/1-10

REV. J

SECTIONS 2 AND 3
INSTALLATION AND OPERATION
A separate operators manual contains most of the installation, setup and operating procedures for the Model lOlA printer. This operators manual should be referred to during normal printer installation and operation.
Included on the following pages is additional information not contained in the operators manual.
2.1 SITE PREPARATION (FIGURE 2-1)
A line drawing of the printer dimensions is shown in Figure 2-1.
As shown in this drawing, the width of the installation site must take
into account the side covers in an opened ppsition.

WEIGHT:

Figure 2-1.

1lS POUNDS

PRINTER DIMENSIONS

2-1

REV. J

Environmental and electrical requirements at the installation
site are as follows:
Temperature:

40~ to 100~F (Operating)
-40 to 160 F (Storage)

Humidity:

5% to 90% (no condensation) - Operating
0% to 95% - Storage

Electrical:

117 VAC~10% 60 Hz
117/234 VAC!10%, 50 Hz

2.2 SHIPPING CRATE
The printer is shipped in a crate approximately 20 inches high, 27
inches deep and 32 inches wide. The crate is made of weatherized, triplewalled cardboard. When properly strapped, the packing crate and printer is
capable of fork lift operation with a seven-high stacking capability.
Shipped with the printer are the following items:
(1)

If a special interface is used, the interface card is included
with the printer. For certain interfaces such as the RS232,
a special cable is also shipped. Cabling requirements for the
standard parallel interface are defined in Appendix B.

(2)

A standard vertical format paper tape providing six line feeds
(one inch) for each vertical tab and 66 line feeds (11 inches)
for each form feed code. This tape is a part of the Vertical
Format Unit. Refer to the Operators Manual for duplicating the
existing tape, or if a different format is desired, for generating a new tape.

(3)

Documentation - All documentation describing that particular
printer is included in a plastic bag under the printer. This
documentation includes a technical manual for the printer and
any optional interface, and a notice of all approved changes
incorporated in the printer but not documented in the manual.
Please keep this documentation with the printer at all times so
that accurate information will be available for troubleshooting
purposes.

(4)

Pin Feed Knobs - This knobs are contained in a small plastic
bag stapled to the guide bar for the pin feed unit.

(5)

Print Sample - A sample printout from that particular printer is
included in the upper paper pan.

(6)

Unpacking/Repacking and Set-Up Instruction Sheet.

Shipped in a separate container is the paper guide and stacker assembly.
Installation instructions for this assembly are included with the assembly and
also in Section 2.3.
REV. J

2-2

2.3 PAPER GUIDE AND STACKER ASSEMBLY
The Series 100 paper guide and stacker assembly (Part No. 5270010015001) can be used with all Centronics
Series 100 printers except the Model
104. It is designed for use in both
table top or printer stand applications, as shown in the diagram.

To attach the unit to a printer, first
remove the two screws from the left
and right sides as indicated. Then, install the paper guide and stacker to
the back, top of the printer using
these four screws.

Make sure the rounded paper guides
rest on top of the printer, in front of
the paper feed opening.

/

/~
PRINTER STAND
APPLICATION

(

TABLE TOP
APPLICATION

2-3/2-4

REV. J

SECTION 4
THEORY OF OPERATION
4.1

INTRODUCTION (FIGURES 4-1 AND 4-2)

This section on the theory of operation contains a detailed description
of each major function performed by the Model lOlA printer electronics.
Throughout this section, reference is made to the schematic diagrams contained in Section 7. The section is organized as follows:
Paragraph 4.2
4.3
4.4
4.5
4.6
4.7
4.8

Basic Timing
Initializing the Printer
Loading Data
Character Printing
Paper Movement
Special Functions
Power Supplies

A basic block diagram of the lOlA printer and a flow chart of the
overall printer operation are contained in Figures 4-1 and 4-2.

-,I

I

~

", r---------1

r-----·

',I

OPTIONAL
INTERFACE

i-!!!!'~~~~,,"
II
~...
I

L___

T'" ....
I

~J

I

I
I

_:"'_I

TO PRINT HEAD
SOL~NOIDS

I
L

\

INTERFACE' I - - - - - - - W - - - - - - I
CONNECTOR

DRIVER
CIRCUITS

TO FWD. CLUTCH

FWD. & REV. CLUTCH
COIf1ANDS

TO LH.E F[E~
SOLENOID

ACKNOWLEDGE.

iii
H

CARD

TO REV. CLuleH

~2

CARD '1

Figure 4-1.

MODEL lOlA FUNCTIONAL BLOCK·DIAGRAM

4-1

REV. J

INITIALIZE

NO

LOAD
DATA

PAPER
MOVEMENT

PRINT
CHARACTERS

SPECIAL
fU~CTIONS

Figure 4-2.

REV. J

FUNCTIONAL FLOW CHART

4-2

The blcd~ diagi~ali1 is arranged to Jhow signal flow between major electrical
assemblies within the printer. The flow chart briefly describes all major
operations performed by the printer, such as initializing, loading data,
printing characters, paper movement and special functions.
4.2 BASIC TIMING (SEE FIGURE 4-3)
The basic timing clock (OSC) for the printer electronics is derived
from a 100 KHz oscillator MElD. Capacitor C4 controls the frequency. Signal
OSC is inverted to generate OSCXT for the interface connector and the
optional interface board. Signal OSC is used on Card #1, signal asci is used
on Card #1 and #2.

r-~~--------------l

I
I

I

I

~~IME

+5V

I
I

C4
0.005

I

CKT.

uf
5

I

1

I

2

4

MEIO

OSCXT

6

6

(100 KHz)

I

TO
INTERFACE
CONNECTOR

3

I

P5

I
I
I

3

OSC

4

TO
CARD #2

L _____-________ .:::~· __& __1I
TO BUSY, F F

Figure 4-3.
4.3

BASIC TIMING CIRCUIT

INITIALIZING THE PRINTER

Before the printer can accept input data, it must first be PRIME'd
and SELECT'ed. The prime operation initializes the printer logic to a ready
state. The select operation after causing a prime condition, resets the busy
line to the interface connect and makes the printer ready to receive data.

4-3

REV. J

4.3.1

PRIME CIRCUIT (FIGURE 4-4, TIMING; FIGURE 4-5, CIRCUIT)

The prime circuit which is used to initialize the printer electronics,
can be activated by anyone of the following conditions:
a.
b.
c.
d.
e.

Power-up,
Selecting the printer,
End of a line of print,
Input delete code,
INPUT PRIME signal at the interface connector.

The prime circuit resets the printer logic, clears the buffer, and
places a dummy character in the first character position in the buffer. A
timing diagram of the prime timing is shown in Figure 4-4.

PRIME - - - - .___- - - - t1-~--~ll-~__~_3m_s__________~·1-

_

OSC

-1

1~10 pS

r--

DMC----

~--~t~~------------------~I
CLKTB

D S 8 - - - - - - -000i\''-\- - - - - - - - - _.....

Figure 4-4.

L

PRIME TIMING

During a prime condition, signal P.RIME goes low, resetting the DMC
flip-flop. The low DMC then allows the OSC~ck to generate CLKTB pulses
for the buffer. At the same time, the low PRIME signal generates a high SCRL
signal which disables the buffer input and allows the CLKTB pulses to clock
ZEROS into the buffer.
Since the PRIME and DMC flip-flops are both activated on the low-going
edge of OSC, the DMC flip-flop remains set for one clock time after PRIME is
reset. During the clock interval in which PRIME and DMC are both active, DS8
goes high and a ONE is clocked into bit 8 of the buffer forming the "dummy"
character.

REV. J

4-4

r---------------------------------------I
I
.

I
FRCI1
FWD •• REV. DRIVE

CARD II.

.

P5

I
I
I

CLUTCH CKT.
CAAD oZ

.SV

rc::;:lI

I

JS

SOARD

r--------------------------,I

I

CARD 'Z

I

J7

Illr----------,

I

R57
FRCI1
SEUCT CtT.
CARD IZ

1

J4

iNPUT PRIME
FRCI1 INT£RFACE
CONNEcTOR

r:""I

BOARD

I
~~~nT I
.CKT.
TO

OSC'

CKT.

r;E~-'

J
MEg
(7473)

TO
DATA

INPUT

I

illi'B

• 1iR!:

I

J5

r.:'I

AI

-t..!:.J---i.!.----

I

I
I
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I' - _ _ --.JI

MEl7
ONE
SHOT
",3 msec

'-------iK

(lR

5RCL

74123
CLR

~---t~TO

ql1

DATA
INPUT

~

CtY.
R20

PRIME
---

T

16

16

I

+SV

I __________________________
L
P'iiRmI---~ ~;::.o.:,:"

I

I

OJ
2 : 1 - - - ' - - - - - -....

I

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r-t--..;,OR..;,8f_-ilC

~c

j7

.-!

-1£

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,

'!

JS

;!!

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I

18/-;;;;;-----------Q

I
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I

'---t-_ _.......------1l-m~-_I ..

"---m--.;.;,1.>0cCIMEl7r:~;"",:S,:"C"_--I18

I
I

FROM
rUNtTiOM

DECODER
(CARD II)

r7

-1,,>J--------=-t

-

~f-

-:;I

~r-

..... :-

T ---

.-1;

__

IT
I
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I
~
I
p'-'----~
.. ~-...J

~

I
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I
StR

:~

~
IL ____________
:;.,>.....

Figure 4-11. BUSY CI RCUIT

~

I
I
I
I
I
I
I
I
_____________________ I
~

A busy condition is developed by the B-input gate ME15 pin 8. The
output of this gate is normally low when the printer is not busy, and goes
high when any of the following conditions occurs:
1.

The printer has been deselected (SEL is low);

2.

A prime condition is in progress (OMC is high);

3.

A printing operation is in progress (CIP is low);

4.

A Carriage Return code has been received prior to the 132nd character in a line (ZBCR is low);

5.

The dummy character appears at the Shift Register output (TB8
is low);

6.

A paper movement operation such as line feed, form feed., or vertical tab is in progress (PM is low);

7.

A line feed operation has just been completed (OLYLF is low);

B. A'malfunction in the video circuit (LO is low), a Bell condition
(BSP is low) or a Carriage Return code has been received (SCR is
low). This causes ORBZ to go low.
As soon as a busy condition is detected, the BUSY signal to the external connector goes high. The low-going OSC signal clocks~the output of
gate ME15 into flip-flop ME22. As a result, flip-flop ME22 delays the
trailing edge of the BUSY signal to the interface connector by one clock interval after the busy state is terminated.
Also, whenever a Form Feed (LFF) or Vertical Tab (LVT) code is received, signal SVFD goes high, immediately resets flip-flop ME22, causing a
BUSY signal.
~~~ The trailing edge of BUSY generates a 4Msec Acknowledge pulse
(ACKNLG) to the interface connector, indicating that the operation is complete.

4.4.5 CLOCKIN~ INPUT DATA INTO THE BUFFER (FIGURE 4-7, 4-12)
If the received dat~ has a ONE in bit 6 or 7 (indicating a printable
CLGT goes high allowing t~e gated data strobe OSTB to generate a CLKTB pulse. This clocks the received character (OSI-0S8) into the
shift register .
characte~ignal

.

If the received character is a control code (ZERO in bits 6 and 7)
other than a carriage return, then CLGT goes low inhibiting CLKTB, and the
character is not clocked into the shift register.
If a carriage return code (octal 015) is received and at least one
printable character has been received for that line (i.e., First Character
Clock fCCLK is set), then the CR code is stored in the shift register.
REV. J

4-14

r------------------------------------------------- 1

I

CAR• • 1

.

rR(IIDAU
I,.PUTCItT

DSTa - - - - - . - - - - - - - - - - - - - - - - - - - ,
DSI
DSI
DSl
I!Sl

O(COOEOBCLl

==:>

TC BELL CKT.

rn
rn
(

LClIir"JrCAfESPf((s(rl'(Or(O"HIOZ~

CHARACaR OTHER THAN (R 0"1 DATA LT';i~

)

: ------------.---'-,'-1 HfZI ~.~tL~'T--------.::::============~I, -·u
L - - - - - - - - - - - -___--!.::t---"
I t;;~ ::,.-

~

~"'R.GEN~

~a

fl

J

II

IL ___________________
.
_____________________________ JI
~

Figure 4-12.

FUNCTION DECODER

4-15

REV. J

4.4.6 FUNCTION DECODER (FIGURE 4-12)
Data inputs from the interface connector are first buffered and then
applied to decoder gates. If a control code is detected, the decoder output
causes the following action in the printer.
Printer Control Functions (Card 2)
Function
1. Carriage
Return

Mnemonic
~

Octal
Code
015

Printer Action
Shift the buffer until dummy character
appears at the output and print the line
of characters.

2. Form Feed

FF

014

Move the paper until the next Top of Form
hole in Channel 1 of the tape reader is
detected.

3. Vertical Tab

VT

013

Move the paper until the next Vertical
Tab hole in Channel 2 of the tape reader
is reached.

4. line Feed

DClF

012

Advance the paper one line.

5. Delete

DEL

177

Prime the printer electronics.

6. Bell

DCBl

007

Generate an audible tone, about two
seconds in duration, in the speaker
at the rear of the printer.

7. Elongated
Characters

UPSC

016

Print the line of characters as elongated
characters (double width).

B. Select

REMSEl

Select the printer.

9. Deselect

REMSEl

021
or
023

REV. J

Deselect the printer.

4-16

4.5 CHARACTER PRINTING (FIGURE 4-13)
When the dummy character appears at the shift register output (TB8),
the logic activates an electromechanical clutch which causes the print head
to move from left to right across the page.

I

PRINT

TO

VIDEO

CLUTCH~

PRINT SOLENOID DRIVE SIGNALS

Figure 4-13.

CHARACTER PRINTING BLOCK DIAGRAM

As the print head carriage moves across the page, the timing fence
(and light source) generate timing inputs to the video amplifier board. These
timing signals are used by the logic to register the five full columns of dots
in the printed·character.
set.
other
These
print

The logic uses two ROM (Read-Only Memory) elements for each character
One ROM defines the dot pattern for the five full-step columns, the
defines the dot pattern for the four half-step columns in a 9 x 7 matrix.
ROM outputs control seven driver circuits which activate the seven
head solenoids.
This section describes the character printing operation as follows:
Paragraph 4.5.1
4.5.2
4.5.3
4.5.4
4.5.5
4.5.6

4.5.1

Initiating the Printing Operation
Print Head Motion
Character Registration and Timing
Character Generator (ROM)
Print Head Operation
Termin~ting the Printing Operation

INITIATING THE PRINTING OPERATION (FIGURE 4-14)

As data is received by the printer, the dummy character is shifted
through the shift register. As the 132nd character is received, the dummy
character appears at the shift register output. If a carriage return code
(octal 015) is received before the 132nd character, this code generates ZBCR.
This allows the OSC clock to generate CLKTB pulses, shifting the register
until the dummy character appears a.t the output. A high TB8 indicates dummy
character.

4-17

REV. J

c...

r-------------------------------------------~-----------.--------------.--~•1
~U

.,
••
••,•
1

1

·• ,,_tTOll,
P-----.
,

'SV_-.NII'--+...J

rtf

,IOMO,

~--HITO

·· .,
•
•
•
·•• .•••
· : :

}""-_ _ _ _ _ _ _ _ _..-:t::.:"~D_--~
~

.. -----..:.r-"""
'sv
III

.!;.
,.----,

I·T;II
I
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~'.15

·

. .

:BCA"
m

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.;· ,... --_ ..
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ss

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rco~:;-rcrO:t1
Mil 7

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,

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,

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to'I

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C.lAO'1

,I, _________________________ ........ __________________________________ __________

~

Figure 4-14. FORWARD AND REVERSE CLUTCH DRIVE CIRCUITS

.• .
L _______ ••

When TB8 goes high and the left limit switch is activated (RTPSW is
high), a low CIP signal is generated. The low CIP signal gated by Delayed
Clutch (DClT) and the -12V supply, controls a driver circuit (via the optional
Motor Control circuit) on the power driver board, the output of which activates
the forward clutch.
Limit switches arc-]ocated at the right and left end of the ~rinter.
These switches (RTP switch on the left, EOP switch on the right) are activated
by a magnet mounted on,the underside of the carriage mechanism. Actuation
of the RTP switch indicates the carriage is at its leftmost position. Actuation of the EOP switch indicates the carriage is at its rightmost position.
The output of these two switches are used to control the forward clutch lQgic
(CIP) and to detect failures in the video signal from the timing fence (lD).
4.5.2 PRINT HEAD MOTION (FIGURE 4-14; SCHEMATIC - SECTION 7)
Power for moving the print head from left to right across the page is
transmitted from the main drive motor to an electromechanical clutch mechanism.
The clutch is controlled by the CIP signal. CIP is gated with: (1) Delayed
Clutch signal (DelT) to ensure that the print head rests at the left margin for
at least 40 milliseconds before being reactivated; a~d (2) the -12V supply, to
ensure that the -12V supply ison before activating the forward clutch. This
gated CIP signal controls the forward clutch driver.
The input to the power driver is normally low thereby causing the
current flowing through R42 to be shunted through CR31 to ground. Diode CR30
offsets the diode drop of CR31. When the input signal goes active high, CR31
becomes back bidsed, causing current to flow through CR30, R49, and transistor
Q29 and Q28 to saturate, and current to flow through Q29 and R41. The current
flowing through Q2B 'also flows through and activates the forward clutch. The
clutch current is limited by R40.
When the clutch signal goes low, Q29 and .Q28 turn off. Diode CR29
provides a current path until the magnetic field of the forward clutch is
dissipated.
4.5.3 CHARACTER REGISTRATION AND TIMING (FIGURE 4-15, TIMING; FIGURE 4-16, CIRCUIT)
As the print head assembly moves across the timing fence, the vertical
slots on the timing fence interrupt light to the optical pick-up head, generating a video signal. The VIDEO AMP output then triggers the STROBE one-shot
ME18 on the logic card, initiating the print timing shown in Figure 4-15.
The STROBE one-shot is adjusted for 450 ~sec. The leading edge of
STROBE also triggers a delay one-shot (ME32-4) adjusted for a 500 ~sec output
pulse. The trailing edge of this pulse triggers the Delayed Strobe (DElSTB)
one-shot which is adjusted to the same pulse width as STROBE. In normal character printing, STROBE is used for full-step timing and DElSTB for the
half-step timing.

4-19

REV. J

VIDEO

~

I--

1mS

VIDEO AMP

-t
STROBE

t--4S0JJS

-t r-

SOOpS

ME32-13

--f

~450pS.

DElSTB

iiCWo---'

0CWi--...

L
1 ____I,

DCW2 - - . . . ; . . - - -.......

D~3----~--------~

I.

~-----~--------------DcW5 ---~----------......
DCWol---"":"'_
DC~2-------------

DCW03---~---------~

~---------------------~
CGl

PRINT TIMING FOR
9 x 7 CHARACTER (AI

CGS

CG6

CG7

Figure 4-15. CHARACTER TIMING
REV. J

4-20

r---------------------------------------------------------------------------------------------------------------------------n

I CARD
I
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~.!.'5'

+12V

1m
I

12

IzseR

(NON-INVERTING)

.m.4.i~~.l. i,

~-iH~~~~~--------_1_+_+_+~~
~
E81
tOY

'5V

TO
POWER
ORlVER

+SV

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"i~O~UFrrR~-----------1
I ·

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6 I

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:!
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P9

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J9 W52 JI2

P1Z

J8

&.----.1

T

r

----

~~~T10N
DECODER

E4

R6

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Jl1 VIDEO

: BOARD

6 --~--.~--.m.--m.--

: m~~N

I

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PH

:,\i-

Ir-----'

I

.. - - - - ,
I CONNECTOR I
:

I DRIVER II
R 7 : : BOARD I

E3

:

II EZ

r----'
I POWER
I

I

R5

CI

'---4~-'-'-""'- :OV

FROM
PRIME
eKT

h61-.:.::.:.:.:::...--.....~I~E8~..:-.:.;.:.:;:;..~L~

I

I

~---------------------.

L _______________________________

~-------------------_-

_____________________________ •• _______________________ - - - - - - - - - - - - - - - - -

Figure 4-16. CHARACTER REGISTRATION
AND TIMING CIRCUIT
4-21

REV. J

4.5.3.1 Video Amplifier (Figure 4-16)
The circuit used to generate and amplify the video signal is located on the video amplifier board attached to the print head carriage.
The video amplifier is comprised of a dual slit sensor and
operational amplifier MEl. Refer to the schematic drawing number 63002669
in Section 7. The dual slit sensor converts light energy monitored through
the timing fence into electrical energy. As the carriage moves, the light
source is interrupted by opaque bars on the timing fence and generates a
pulsating output. The positive output generated on each light signal is
applied to the positive input of MEl. The signal is amplified by MEl and
provides a high output for each light signal. The duty cycle of VIDEO output is set by adjusting R4.
4.5.3.2 Timing Signals (Figure 4-15, Timing; Figure 4-16, Circuit)
For nonnal character printing, five consecutive STROBE pulses are
counted down by the divide-by-six counter ME27. The counter outputs PWCl,
2 and 4 are then decoded to generate timing outputs DCWO-DCW5. These timing
intervals correspond to the five full-step columns in the character matrix.
The quiescent state of this strobe counter is DCWO which corresponds to
the space interval between characters. During DCWO, the STROBE input generates a CLKTB pulse which clocks the next character to the output "of the
shift register. The DCW1-DCW5 timing outputs are used to address the
appropriate column in the IIfull-step ll ROM (character generator).
During each video interval both a STROBE pulse and a DELSTB pulse
of the same width is generated as shown in Figure 4-15. During normal character printing (when UCC is high), four consecutive DELSTB inputs to counter
ME24 generate timing outputs DCWOI-DCW04. These four timing intervals
correspond to the four additional C'half-step") columns in the 9 x 7 matrix.
Timing signals (DCWOl-DCW04) are used to address the appropriate column in
the "half-step" ROM (character generator).
c

During elongated character printing, the UCC latch is set allowing
alternate STROBE pulses to clock the strobe counter and alternate ECSTB~ses
to clock the delayed strobe counter. As a result, timing outputs DeWI-DCW5
and DCWOI-DCW04 are twice as long during elongated character mode than
during normal character mode.
During the space interval between characters (DCWO), the delayed
strobe counter is reset.

REV. J

4-22

4.5.4 CHARACTER GENERATOR (ROM - FIGURE 4-16)
The logic board can contain up to four ROM elements, depending on
the selected character generating capabilities of that printer. The ROM's
in element locations ME33 and ME35 each provide full-step outputs (i.e.,
columns 1, 3, 5, 7, 9) for up to 64 characters. The ROM's in locations
ME34 and ME36 each provide half-step outputs (i.e., columns 2, 4, 6, 8)
for up to 64 characters. ME33 and 34 are used for the standard 64 character set, ME34 and 36 are used for the optional character sets.
Each ROM (Character Generator) element has three inputs (in addition
to the input voltages):
(1)

The character address - The standard 64 character ROM's~E33
and ME34) are addressed by TB1-TB5 (CHADD1-CHADD5) and TB7
(CHADD7). By using TB7 inverted as character address bit 6,
lower case character codes are automatically printed as upper
case characters (e.g., as upper case A - 100001, and a lower
case a - 1100001, both apply the same character address to the
ROM). In the optional ROM's (ME35 and ME36), character address
bit 6 is controlled by TB6.

(2)

Column Address - Timing outputs DCW1-DCW5 specify the five "fullstep" columns in each~7 character matrix in ROM's ME33 and
ME35. Timing output DCW01-DCW04 specify the four "half-step"
columns in each 9 x 7 matrix in ROM's ME34 and ME36.

(3)

Timing - A low input to pin 28 of each ROM gates the 7-bit dot
configuration of the addressed character and column to the output of that ROM. For the full-step ROM's (ME33 and ME35), this
timing input is STROBE ANDed with ROMTB8 or ROMTB8. For a standard 64-character configuration, ROMTB8 is always high allowing
each STROBE pulse to gate the standard ROM output. The STROBE
pulse provides the timing input for gating the 7-bit dot pattern
to the print head solenoids.
For the half-step ROM's (ME34 and ME36), the timing input is
ROME2 ANDed with ROMTB8 or ROMTB8. For normal character printing,
ROME2, is coincident with Delayed Strobe signal DELSTB. This
effectively interleaves the dot pattern from the half-step ROM's
with the dot pattern from the full-step ROM's.
For elongated character printing, ROME2 is coincident with each
STROBE signal. This combined with the fact that the DCW timing
signals are twice as long during elongated character mode, causes
the printed character to be twice as wide as a normal character.
An example of the character (V), both in normal and elongated
style, is shown in Figure 4-17.

4-23

REV. J

7

I

11. 1 c!"J,,~,

-ONOC"')Oo:tOIn

~ ~ ~ ~ ~ ~ ~ ~ ~

UUUUUUUUU

o

0

0

000 000

iu
0

1
0

~
U

X

I

I

C"')

N
0

~

I

C"')
0

~

- - - -,.,

0

0

0

U

9

I

N

~

7 NORMAL

U

0

~
U

u

N

N
0

U

U

0

0

0

~

~

U

~

0

9

X

0

~

u
0

~

U

0

~
~

u

I

o:t
0

~

I

an
~

~

-

-

0

0

0

e.

C"')
0

U

u
0

o:t

~
U

u
0

I

an
~
U

0

o:t
0

~
U

7 ELONGATED

Figure 4-17. NORMAL AND ELONGATED CHARACTERS
The seven outputs from all four ROM's are wire ORed together and
applied to the Power Driver board as signals CG1-CG7.
4.5.5 PRINT HEAD OPERATION (FIGURES 4-18, 4-19)
The print head is the device used to print the characters. The head
contains seven solenoids that move seven wires against the ribbon to form the
column of dots on the paper. The position of these solenoids and the location
of the wires in the ~head are shown in Figure 4-18. Solenoid #1 controls the
top dot and solenoid #7 controls the bottom dot in a column. The wires come
from each solenoid and are positioned at a jewel located at the end of the head.
The length of these wires is approximately 3.5 inches and each wire requires
about one ounce of force to begin" its movement. The amount of force needed to
move the wires 0.015 inch (i.e., the distance necessary to make a dot on the
paper) is about 12 ounces.
The total distance travelled by the wires is approximately 0.015-inch,
but under normal operation, the end of the head is about 0.006 inch from the
ribbon and paper. The reason for locating the wires closer than 0.015 inch from
the paper, is to account for the amount of force absorbed by the ribbon and
paper upon impact.

REV. J

4-24

JEWEL ASSEMBLY
WIRE OUTLETS
(FACE OF HEAD)

SOLENOIDS (1-7)
(BACK OF HEAD)

Figure 4-18.

SOLENOID POSITIONS, 1 THROUGH 7

The electrical timing and mechanical movement of the wires is shown
in Figure 4-19. As shown, a 450 microsecond pulse is used to complete the impact. The voltage used to drive the solenoids is +35 volts unregulated. This
voltage is about +35 to +38 volts when the pins are in an idle state, but drops
to about +30 volts when all pins are engaged at the same time. From the beginning of the 450 microsecond drive pulse, about 200 microseconds is required
before the wire starts to move in each solenoid. Once the wire starts moving,
an additional 300 microseconds is required before the wires make an impact on
the paper. Approximately 500 microseconds more are required for the wire to
retract to its normal position ..

l

SOLENOID
DRIVE PULSES

MOTION OF
WIRE

1-..----450~S

ImS

----~I

I

I

L

T

.015"

-*--~
~275~Sr­

DISCHARGE
OF CURRENT

--~II~------~II_----Figure 4-19. PRINT HEAD TIMING

4-25

REV. J

4.5.6 POWER DRIVER CIRCUITS (SCHEMATICS, SECTION 7)
4~5.6.1

Solenoid Drivers (Figure 4-20)

The wire ORed outputs from the character generator CGI-CG7 are
applied to the solenoid power driver circuits where they are inverted,
amplified and used to generate current pulses for firing the solenoid in
each head.
Since all solenoid driver circuits are identical· and operate in
the same manner, only the first one, controlled by CGl will be described.
Referring to Power Driver schematic #63002275, when CGl goes
high indicating an active condition for solenoid #1, current flows through
R4. This current flows into the base of Q3, turning it on. The current
through Q3 then develops a positive level across R5. This level causes Q2
and Ql to act as em; tter fo 11 owers, deve 1opi ng a voltage of approxima te·ly
3.8 volts across Rl. Resistor R2 limits power dissipation in Q2.
The 3.8V across Rl allows approximately a 2.5 amp current flow
through solenoid #1 and transistor Ql. When Ql is first turned bn, the
inductance of the solenoid prevents current flow through Ql. Transistor
Ql is saturated at this time. When current flow through the solenoid
reaches approximately 2.5 amps, Ql goes into the active region and limits
the current to this value.
When CGl goes inactive low, Q3 turns off, turning off Q2 and Ql.
When Ql turns off, the solenoid current flows through CR2 and Cl. The value
of C1 is chosen to act as a parallel reasonant circuit with the inductance of
the solenoid. Diode CR2 allows only a quarter-wave of the reasonant frequency. A waveform diagram is shown in Figure 4-20.
+60V--~

VOLTAGE
+30V----.

I~

i
CURRENT

0

REV. J

/'

\.

Figure 4-20.

POWER DRIVER WAVEFORM

2.5 AMPS

f

350 IlS

4-26

4.5.6.2 Sapacitor Discharge

Circu~ ~S

After Cl, C2, C3, C4, C6, C7 and C8 have charged to approximately
60 volts because of the dischar~ing solenoid current, resistors R61, R62,
R64, R66 and R67 serve to bleed off this charge so that the capacitors will
be at a 30 volt bias at the time of the next discharge. The value of the
resistor is chosen so that a time constant of about 275 microseconds results.
4.5.6.3 Shut-Off Circuit
Diodes CR39 through CR45 have their cathodes tied together and
connected to the collector of Q33 and cathode of zener diode CR48. When
the printer is turned on, the +5 volt supply prevents Q34 from conducting.
This prohibits ,current from flowing through the voltage divider comprised
of resistors R79 and R80. This prevents Q33 from conducting and applies
the voltage developed across zener diode CR48 to the cathode of diodes CR39
through CR45. In this condition, diodes CR39 through CR45 cannot shunt
current away from the solenoid drivers.
When the printer is shut off, it is characteristic that the 5 volt
supply output drops before the 30 volt supply output. When this happens
Q34 turns on and current flows through the voltage divider comprised of
resistors R79 and R80. Q33 is turned on and shunts the zener diode CR48.
This clamps the base of the first emitter follower of each solenoid driver
to ground through diodes CR39 through CR45, preventing any of the solenoids
from firing during power turn off. The Clutch and line Feed Drivers are
also attached to the collector of Q33 through diodes CR36, CR37 and CR38.
Therefore, during power turn off, the clutches are released and paper movement is inhibited.
4.5.7 TERMINATING THE PRINTING OPERATION
4.5.7.1 General
When the print head carriage reaches the right limit switch (EOP goes
low) or when a CR character is detected at the shift register output, (RDCR
goes low), CIP goes bi[h, turning off the forward clutch. The high CIP:
(1) generates a low CIR which activates the reverse clutch returning the print
head to the left margin, (2) triggers the PRMOS one-shot generating prime
condition, and (3) triggers the line Feed one-shot (if the automatic line
feed is not disabled) causing the paper to advance one line. During the line
Feed (IF) and Delayed line Feed (DlYlF) interval, the printer remains busy
and cannot accept data. At the end of the DLYlF interval, however, the printer
goes unbusy and data can be received during the carriage return.
When the print head reaches the left margin, the low-going RTP signal
triggers one-shot ME22-6 generating a 40 millisecond Delayed Clutch interval
(DClT). During this time both clutches are prevented from turning on.

4-27

REV. J

4.5.7.2 Reverse Clutch Driver
Power for moving the print head from right to left ;s transmitted
from the main drive motor to a reverse clutch m'echanism. Signal eIR from,
the logic board directly controls the reverse clutch driver on the Power
Qriver board, unaffected by the optional motor control circuit.
The reverse clutch driver operation is identical to that of the
forward clutch driver described in Section 4.5.2, except that it is controlled by a signal CIR instead of CIP.
4.6 PAPER MOVEMENT
Three separate printer functions can cause a paper movement operation:
line feed, form feed, and vertical tab. Each of these functions cause the
paper to move by activating the Paper ~1ovement Solenoid (Pr1S0L), which in turn
activates a clutch that mechanically links the form feed motor to the paper
feed tractors.
For each line feed operation, the solenoid is energized 15 milliseconds.
At the end of this interval a 60-90 millisecond line feed delay is generated to
allow the clutch pawl and clutch mechanism to return home before another paper
movement operation is allowed.
In response to a form feed or vertical tab command, a dc level is
applied to the solenoid, allowing continuous movement of the paper. This
paper movement is terminated when a hole is detected in the appropriate channel
of the vertical format paper tape. The operation of the VFU is described in
Section 4.6.4.
4.6.1

LINE FEED (FIGURE 4-21, CIRCUIT; FIGURE 4-22, TIMING)

The line feed operation can be generated by any of the following three
conditions:

REV. J

(1)

After printing a line of characters (if the automatic line feed
is not disabled, E10 to Ell is connected) then the low-going
forward clutch signal CIP, triggers the LF one-shot.

(2)

Receiving a line feed code (octal 012) - The function decoder
generates a low DCLF pulse during data strobe, the trailing edge
of which triggers the LF one-shot.

(3)

Pressing the LINE FEED switch on the operator panel - Pressing
this switch causes REMLFSW to go low. When the switch is re,leased, the high-going REMLFSW triggers the LF one-shot.

4-28

:;;ir-----1

~~~«ro~
I ICARD
I
:
:

: FROM FWO •• lEV. I
I OIIIYE CLUTCH ClY
CIP P7

!

r~~7i--·----------·----------------~---------------------------------------------------------~
:
I
P5

#.t _ __P.,

AUTCllATlC
LINE fEED O/ITJDII
ElO Ell

~--~--~-,-9----------.

I

: (FOlWAKD OIIIYE
I
I SiGNAl - CAUIAGE I
~
I, _________
IN PlINT)
:

OlITA
TO
OATA

I
:

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:_

tOY

J IZ

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P6 CATA l_

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FROMT 'AlltL

II

I
I
I
I

A

a

T~~

!

II

P~~~Y~E~T~EOOTCKT---------------------,

E9 ~

:
I

l~

LINE FEED

SWITCH

I
:

·sf

__

Piz

I
I
I
I
I
J"s

,..

'T'

~

JO

cae

CRl

~---~

ICOIINECTOIII

C21

FRO!!

pRIIIE-~;.;.;..;.;.;.;.;.;;;.,

ClY

__

WUsW

: BOARO
J6

ISO
.--_~

147

I
I
I
I

ua

I----....;;:=.::...-----~.J\I',""'-~.sy

: :

~----~

.35

!OY

tOY

____ PIISOlI

I
I
I
I

I
L----____________________________~II
"E6~..,;;....----------'

~
'12

Jil

J9

---qJ----£p---- ~
I
I

I
I

L ____ ~

I

~

r-~-'

IPQI(IDlIYU I

:IOUD

:

I
Pia
I
L_~_J
I
I

I

~

JIO

..

TO
IUSY
elY

400.
3501

LIN[ fEED
SOWIOID

.lOY

:;:0

fT1

c:::

Figure 4-21. LINE FEED CIRCUIT

The width of the LF pulse generated by any of these three conditions
is normally set to 15 milliseconds by adjusting R54.

LF------~h;=15 ms~~---------------------------­

,
I
I
I

PMSOL----~

-OL-YL-F

...
' ·---60-90 mS---+i-'

------------------~I

Pl-------1
.....- - - I

BUSY

I

ACKNLG----------------------------------------~'p-------

::0::4 p.S

Figure 4-22. LINE FEED TIMING
The low LF generates PM, and if no paper time-out condition has
occurred (PMTO is low), PM generates PMSOL. The high PMSOL signal activates the line feed solenoid via the Power Driver board. The trailing
edge of PM triggers a 60-90 millisecond Delay Line Feed interval DLYLF.
During both the LF and DLYLF intervals, the printer remains busy.
4.6.2 FORM FEED (FIGURE 4-23, CIRCUIT; FIGURE 4-24, TIMING)
A form feed operation can be generated by either' of the following,
two conditions:

REV. J

(1)

Receivifl[ a form feed code (octal 014) signal FF sets latch LFF which generates
SVFD allows the next OSC' to set the VFD
sulting low VFD signal then activates PM
vates the line feed solenoid.

(2)

Pressing the TOP~ FORM switch on the operator panel - This
generates a low TOF signal which sets the LFF latch and generates
PMSOL as described in (1) above.

4-30

The decoded form feed
a high SVFD signal.
flip-flop. The reand PMSOL which acti-

r----------------------------------------------------------------------------------------------------------- ---~
CARD II

CHAHIIEL 5

AMPLIFIER

CHANNEL

"0.

r----+JVI,.,....~--::i14.

2

PI" 1

R27

Q4
R28

!ovo-......------<~--......I

rec;.£cTci 1
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I

J4

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•

J6

DATA l . . . r l - . f l

~~TA 8 ~~1,111111111
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P!----....

~:~~is:

I fRONT PAAElI
COHhECTOR I
I
I
/
I
57
I
I
10f~lf .27 1 _ . / 1\128 JI2
PiZ

!

~,

:

:

:

;
I
1

rTAP[ READER1
I

I

I
:

I

AMP

\ 1161 0

I
I

I

..

!

wn

tllZ

~~

I
I
I
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TO

LINE FEED
,rT

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:
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PI2

I
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:
P6

I

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I

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:

A--~----

~~~DF

1
1.. -SIIITCH!
o
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I
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P~2

C-- C

4----

AMPuFilPs--------,

'ijPr;D- - - - - - - - - - -.....,

:5£cT JIl':

I

qj

I

I
IL

~~LJ 18

"'Ella

'I

tOt

Cl.

Improper main drive motor
friction clutch adjustment.
Defecti_e drive motor.
Dirty guide bars.
Improper belt tension.
Improper bushing seating in
,lutch end brac~ets.

8.
f·2

1.
2.

BI~DS

2.
3.
4.
6.
C·l

:J.

RIBBON FEED FAILURE

).[

NO
1.
2.

NOIS~

2.

3.
4.
5.

6.
C·4

Optics block touching ti"llng
fence.
Drive belt too tiQ~t.
Clutc~ assembly and brackets
too tight.
Spring drum too tight.
Reverse clutch not releasing.
Restricted ribbon drive.

3.

Belts too tight.
Belt idler worn ur rubbing
against casting.
Improperly adjusted intermediate
pulley.
Worn intermediate shaft or
bushings.
Corroded clutch rotors or
armature.
Poorly lubri~ated spring drum.

4.

5.
J-2

I.
4.

Defective
Defecti.e
Defect! ve
Defective

2.
3.
!>.

Tu..r~~

EOP s"itc~.
Driver ooard.
Log' c ooard (LSI).
Electronic Card No.

5.

ribbon feed clutch
;pnngs.
Improper ribbon drive ~haft
qear mesh.
Loose ribbon drive slip tlutch
setting.
Improperly seated ribbon spool.
Improperly engaged bevel gears .•

E-3

E-4

~·3A

Scrolling or

4.

5.
5.
7.
8.
3.
10,

1.

Defective [Iectronic Card No.2
(TTl; ,
No video s'qoe!.
a. Defect"" V,~eo Amplifler.
b. Defecti.e cptics block.
c. Defective rib~on cable.
d. !mpro~erly adjusted opt'c blo: ..
Jlrty t 1ming fence

2.

F"!~

IMproperlj adjusted guide
roller.
Improperly adjusted rod
linkage.

1.

~orn

ter.:-·lon a,.,.. padS

1
2.

4.

Defective ·12V supply.
Defective Driver board.
Defective logic board (LSI).
Defective Electronic Card No.
(nL).
Dirty or loose beard connec·
tors

2.
3,
~·4

C-4C Botn Clutches Locked When Printer
Powered Ue

1.
2.
3.

4.

Improperly seated electron;c
boards.
Defective driver board.
Defective logic board (lSI).
Defective Clectronic Caro No.2
(TTl) .

C-4D Reverse ClutCh Does Not Turn Cff
1.
J.

Defective RTP switch (check
cont i nu HI to cavity).
Defective driver board.
Defective logic board (LSI).

...

rnechan;sm play.
Imp"'o~'er upper aile 10wer r~ddt?r

~

7.
3.
q.
10.

RIBBON FEEe DURING CARRIAGE
RETURN

1.

Broken clutch control on
ribbon feed clutch gear.

II.
12.
~-7

E.

PAPER MOVEMENT FAILURE

E-I

FORMS RUNAWAY

1.
2.
~.

Defecti.e
Defective
Excessive
upper and

or miSSing VFU tape.
VfU LEO's.
gap between VFU
lower reader ~racket.

cack stop pawl and cam

brackH qap.
Looser. set Old:;. t paper drive
s1ide shaft.

'10 LINE FEED

oj.

l~proDerly adjusted orive
l,"kage.
Sticking solenoid wires
Defective driver board

LINE SPACiW;

E~cesslve

D·3C T..ear i !!9.
I.

Gear mesh too tight.
Fo,," feed motor ~lutch roller/s
binding (FF Clutch Inside Cam:.
Defective driver board.
Defective logic board (lSIi
Defective [lectronic Card !lo. I
(TTL).
Defective form feej resi5tor.
Defective solenoid.
Defective ~12V supply.
Defective 30V unreg"lat~ suppl}.
uefective TOP or FORM switch.

I.

•.

(earl i pr un; t s ~ .

Improperly adjusted platen knob.
See Erratic Line S~acing (E-S).

ERR~Tlc

j.

~-E

SKEW

Non-aligned pin feed sproc~ets.
Paper pan friction against forms.
Pin feed holder. paper thickness
setting too small.
Pri nt head too close to paper.
Incorrect paper feed (mostly In
uni ts wi tho"t paper rack).

NO FORM FEED
I.
2.

(-5
ERRATIC MOVE"'ENT

a:

INTERMITTENT OPERATION
I.
2.

Improper ribbon drive shaft
gear mesh.
loose ri~bcn drive s1ip-cl~tch
setting.
Bro'e~ tlutch spring.
Frczen ribbon revers ing rod
(earlier design).
Improper I v adj u$led r i bboll
rever~ i ng rOd.

)·3

(TTL)

6.

Bro~en

j.

I.

CLUTCH

2.
3.

5.

NO RIBBON REVERSE

4.

C·4A Forward Clutch Does Ilot

4.

FEEC

RIB&O~

Improper aligoYTler;t of reader
bracket LE~· s to tape he 1es.
Defective loqic b~ard 'LSIj.
Defective Electronic Gard tlO.
(TTL).
ContlnuouslJ energized s01enoi1.
Defective driver board.
b. Driver resistor shorted to
bracket.
c. Defective Electronic Card
No.1 (iTl).
Clutch slide I>awl movement
restricted.

PAPE~

3.

1.

MISSING DOTS, POOR OR INTERMITTENT PIN
REGISTRATION ALL CHARACTERS

1.

B-3

Dirty or defective timing fence.
Optic block out of adjustment.
Improper head position.
Defective Video amplifier.
Defect;ve ribbon cable.
Defective LlD's.
Olrty board or cavity connectors.
Improper ali gnment of tim i ng
fence to optic slit.
IlIIproper alignment of optiCS
block.
Improper "'ain belt tension.
Defective logic board(TIl).
Defective Driver board.
Defective t12V or +SV re,ulator (TTL).
Defective Electronic Card No. 2 (nl~.

C-2

Improperly 3djuste~ main drive
belt.
Spring drum unwound or brok~n.
Main drive belt toucning dri,er
board cables.
Defective bushings.
Worn or missing teeth on main
timing belt.
Defective RTP switch.
Defective motor pul1ey ..
Improperly adjusted motor clutch
plate.
Defective drive pulleys or gears.
Dirty carriaqe gu'de bar.

:"prcperly adjuHed 'orm feee
ragnet.
Solenoid loose on po'- P'ust
be sea ted in bracket).
Gap between s I ide and paper
feed clutch ca'" tab.
Defective Driver board.
Oefective lC9i~ toard (lSI).
uefective Electron;c Card -1
(Til).
improper Logic b0ard jumpers
(LSI).
Defective platen knOb ~ssenbly.
Defecthe solenoid.
Defective fo,.", feed resistor or
bad solder connection.
VFl; belt worn or slippinq.
Clutc~ slide pawl Dinding.

MUl TlPLE LINE
I.
)
,
4.
,

FE£~

l:nprope-li adjuste,j solenoid.
LJefective solenOid arro:dture
spring.
Defective Dr;\ler board.
~efective logic board (lS[}.
Defec~iye Electror.i, Card ~o.
(TTL) .

6.
5.

Excessive line feed pulse width.
Clutch slide pawl binding.
Gap between slide and paper feeo
clutch inner cam tab.

6.5 RECOMMENDED TOOLS
c...

cenTRDnlCS

CENTRONICS TOOL KIT

data computer corp
HUMOH, "IW MA."."I".

(83002389-8001)

u.a.A.

nEM

~

DESCRIPTION

PART
NUMBER

l.

Universal Handle

30600002-3001

Z.

Extension 4-Inch

30600002-3002

3.
4.
5.
6.
7.

4 mn Nut Driver
5.5 mn Nut Driver
7 mn Nut Driver
8 mn Nut Driver
10 "'" Nut Driver

30600002-3003
30600002-3004
30600002-3005
30600002-3006
30600002-3007

8.

Ph1llips Head Screwdriver

30600002-3009

9.

Slotted Head Screwdriver

30600002 - 3003

(1)

~
(2)

0\
I

0\

A
~
/'
~
~2)1

10.

11.
12.

Needle Nose Pl fer

5 x 5.5 mn Open End Wrench
6 x 7 mn Open End Wrench

ITEM

DESCRIPTION

PART
NtNER

13.
14.
15.
16.

8 mn Combination Open End. Box Wrench
10 mn Combination Open End. Box Wrench
17 mn Combination Open End. 80x Wrench
19 mn Combination Open End. Box Wrench

30600002-3012
30600002-3013
30600002-3014
30600002-3015

17.
18.

l/l2-Inch "Til Handle Hex Key
S/32-lnch "r" Handle Hex Key

30600002-3016
lO600002-3017

19.
20.
21.
22.
23.
24.

1/16-Inch Hex Key
.050- Inch Hex Key
1.5 II1II Hex Key
2.0 111ft Hex Key
2.5 mn Hex Key
3.0 111ft Hex Key

30600002-3025
30600002-3024
30600002-3020
30600002-3019
30600002-3021
30600002-3022

25.

Spanner Wrench

63003105-3001

26.
27.

4 m Snap Ringer Holder
5 ... Snap Ring Holder

63002399-3018
63002399-3019

28.

Spring Hook

63002399-3020

29.

Tool Pouch

30600002-3018

30600002-3010

30600002-3023
30600002-3011

SECTION 7
ELECTRICAL DRAWINGS AND LISTS OF MATERIALS
This section contains the schematic, wiring and assembly diagrams,
and lists of materials for all the electronic assemblies in the Model lOlA.
The following is a list of the drawings appearing in this section.
Figure No.
7-1
7-2
7-3
7-4
7-5
7-6
7-7
7-8
7-9
7-10
7-11
7-12
7-13
7-14
7-15
7-16
7-17
7-18
7-19
7-20
7-21
7-22
7-23
7-24
7-25
7-26
7-27
7-28
7-29

Description

Drawing No.

Schematic Dia~ram, Electronic Card #1 (Sheet 1 of 2).
Schematic Diagram, Electronic Card #1 (Sheet 2 of 3).
Schematic Diagram, Electronic Card #1 (Sheet 3 of 3).
Schematic Diagram, Electronic Card #2 (Sheet 1 of 3).
Schematic Diagram, Electronic Card #2 (Sheet 2 of 3).
Schematic Diagram- Electronic Card #2 (Sheet 3 of 3).
Schematic Diagram, Power Driver Board (Sheet 1 of 2).
Schematic Diagram, Power Driver Board (Sheet 2 of 2).
. Schematic Diagram, Video Amplifier.
Schematic Diagram, +5V Volt Regulator.
Schematic Diagram, ~12 Volt Regulator.
Multitap 50/60 Hz Transformer
Wiring Diagram, Printer Mechanism.
Interconnection Diagram, Connector Board.
Schematic Diagram, Motor Control (Optional).
Schematic Diagram, LED Tape Reader (Optional)
Component Board Assembly, Electronic Card #1
Component Board Assembly, Electronic Card #2 .
Component Board Assembly, Power Driver Board
Component Board Assembly, Video Amplifier
Component Board Assembly, +5 Volt Regulator.
Component Board Assembly, ~12V Regulator
Component Board Assembly, Connector Card
Component Board Assembly, Motor Control (Optional)
Harness Assembly, Motor Control~
Electronic Cavity Assembly .
WI Harness Assembly
W2 Cable Assembly, Computer Input
W3 Power Cable Assembly .
7-1

7-1
7-3
7-4
7-5
7-6
7-7
7-8
7-9
7-10
7-11
7-12
7-13
7-14
7-15
7-16
7-17/7-18
7-19
7-21
7':'23
7':'25
7-27
7-29
7-31
7-33
7-35
7-37
7-39
7-41
7-43

REV. J

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'n" SCHEMATIC DIAGRAM,

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BOARD.

-::. C -63002308
Figure 7-11.

SCHEMATIC DIAGRAM ~12 VOLT REGULATOR

-F

THE INFORMATION CONTAINED HEREIN IS
PROPRIETARY AfiD IS PlOT TO BE RELEASED
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MISSION OF CENTRONICS .... _ _ awp.

220 V

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IEVISIONS

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INTERCONNECTION DIAGRAM, CONNECTOR BOARD

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LIST OF MATERIALS
ELECTRONIC CARD #1
(Ref: Ass'y No. 63002302, Rev. E4)
ITEM
1

2
3
4
5
6

6A
7
8
9

10
11

12
14
17
18
19
20
21
22
23
24
25
26
27
29
30
31
32
33

34
35
36
31
38
39
41
42
43
44
45
46
47
48'
49
50'
50A
51
52
53
54
55

REF
REF
Rev. J

OTY PER

PART NO.

NOMENCLATURE

63001051-2001
21330001-1001
21102000-1001
21502001-1001
22107002-1001
21103003-1001
21103004-1001
22105002-1001
22206002-1001
21473000-1001
22506002-1001
21224000-1001
22505002-1001
3h100904-1001
15474040-1001
354747.30-1001
35474000-1001
35474060-1001

PC BO AW ELECTRONIC CD#1 lOlA
CAP CERAMIC OI.SC 33PF 1KV
CAP CERAMIC DISC .001UF
1KV
CAP CERAMIC DISC .005UF 1KV
CAP ELECTROLYTIC
100UF 25V
CAP CERAMIC DISC
.01UF
lKV

1
1
8
4
3
3

CAP CERAM GLASS SEAL .01UF 50V
CAP ELECfROLYTIC 1UF 25V
. CAP ELECTROLYTIC
20UF 25V
CAP CERAMIC DISC .047UF 12V
CAP ELECfROLYTIC
50UF 25V

AIR

CAP CERAMIC DISC
CAP ELECTROLYTIC
o lODE
INTEGRATED CIRCUIT
INTEGKATED CIKCUIT
. INTEGRATED CIRCUIT
I~TEGRAT~D CIRCUIT

~22UF

5UF
WG904
1404
7413
7400'
1406
7402
1410

35474020~1001

INTEGRATED CIRCUIT

35474100-1001
35440241-1001
35474123-1001
35474200-1001
35474500-1001
-35474300-1001
41102Y26-1001
41471926-1001
41472926-1001
41123926-1001
41221926-1001
41101926-1001
41223926-1001
41682926-1001
41103926-1001
41105926-1001
41222926-1001
41473926-1001
41391926-1001
41271926-1001
41220016-1001
41393926-1001
41752926-1001
46203980-1001
38239040-1001
38239060-1001
38300050-1001
38200311-1001
39648505-0004-9
30070000-0001
39610000-0005
39690200-002U
11410001-2006
63001052-9001
63002315-9001

INfEGRATED CIRCUIT
INTEGRAT~O CIRCUIT MC4024P
INTEGRATED CIRCUIT 74123
INTEGRATED CIRCUIT 7420
INfEGRATED CIRCUIT 7450
(~rEGRATtD CIRCUIT
1430

12V
(bV

KcS CARBON
1 K
1/4W 10%
RES CARBON 470 OHM 1/4W 10%
KES CARBON 4.7 K
1/4W 10%
~ES CARBUN l2K 1/4W 10%
~~s CARBON 220 OHM 1/4W 10%
RES CARBGN 100 OHM 1/4W 10%
~ES CAKBUN
22 K
1/4W 10%
KCS CARBQN 6.8 K
1/4W 10%
RES CARBON 10 K
1/4W 10%
KES CARBON 1 MEG 1/4 W 10%
~[S CARBUN 2.2 K
1/4W 10%
~ES CARBON
47 K
1/4W lot
RES CAHBON 390 OHM 1/4W 10%
RES CARBON 270 OHM 1/4W 10~
~ES CARBUN
22 OHM
lW 10%
t{fS Ci\RBdN 39 K 1/4W 10%
;{ES CARBON 7.5 K
1/4W 10%
POTENTIOMETER 20K 3/4W 10%

TRANSISTOR NPN 'GEN PUR2N3904
TRA~SISTOR PNP GEN PUR 2N3906
TRANSISTOK .NPN HI VOLT MPS V05
TRANSISTOR TIP 31A

WIRE TYPt B 26AWG WHITE
SOLDER
WIRE BUSS #22AWG
rURING TEFLON TFT 200 #20 NAT
SOCKET
16 CONTACTS
PC BO DO ELECTRONIC CDtl lOlA
SCHEM PC AD ASSY ELECT CO#1

7-20

2
1
1
2

1
1
6
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2
5
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3
4
1
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12
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1
3

3
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2
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1
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IDENTIFICATION

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APD .JUMPF·K, L.EA.C FRO~ '~E:.:;7 J.-"IN I "'0 ME:Z. PIN II.
AC:: J.JMPEW' L.E~;: ~k':;.1 IloAE·S PiN:O - 0 ,..~~ZZ PINI.
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TABLE I

~) 311 '31- 1001
35512800-1001
35474710-1001

3IJl.74000-1{J01
3~474(14·0-1001

25

35474300-1001
3')474020-1001
3'3474200-1001
"1 5 to ., 4 1 2 1 - 1 00 1
3'5474100-1001
J1)474070-1001

26

35474920-1001

27

3:5',74145-1001
j5474060-1001
"i Sit 74123- 1 ('0 1
3 !jl. 74260- 1001

,,1

.........

c._t:.

23
24

?U
29
'32

I~OMENCLA

'lTV PER

lURE

PC BO AW

CAr ELEcr~OLYT[C
100UF 25V
CAP ~LECIKOLYTIC
lOUF
2~V
CAP CERA0IC DISC 470PF lKV 20%
CAP CEKAMIC UISC .001UF
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20UF
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CAP C [ R Ai;· I C L J S C • OO? UF 1 t< V

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16 CU;JTACTS
I N rEG k .1\ T ~ [) C LR ClJ I T r ~1 S 3 1 1 3

CIRCUIT C2040
I i'J TEGRAT:~ [) C IRe UI T 7473
[ .-J TEGKAT ._. D C I I{ CUI T
7400
INTEGRAT_D CiRCUIT 7404
I~rEGkAT~O ClkCUIT
7430
I i'J Tc GK!l T1-.0 C IRe UI T 740 2
INTE~kAT~O CIRCUI·r
1420

INTEG~AT~D

INrEGKAT~O

CIRCUIT 74121

CIRCUIT 7410
I \J TEG ~ A L- U C 1 '-{ CUI T 740 J
L\J T E (j RAT •. D C IRe U ITS ;'1 7 4'1?
1 ~~ T t: (~ R A r i_ 0 C I RCUI T 7 41 4 5
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41103Y26-1GOl

r~ ESC A k B ' .' N

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3h~2qO"I-1()Ol

7406

CI~CUIT

CIRCUIT
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li". rEG I{ l\ T.: 0 C I'K ClJ 1 T Si'l7 4 2 £>
INTE~~AT.:O

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1 1-,8 2 ~) 2 6 - 1 00 1

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CERA~IC VISC
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CAP CER ,1\;\: I C IJ 1 SC
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CAP CE~A0 GLASS SEAL .0IUF SOV

34

4

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REF
REF

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IKE BlJ S :; #2 2 AwG
CHA;{ c,l'J; RATUk LOCATION Ct-\t'\RT
PC RD Dn ELECTRONIC CARD '2

63002".i16-9001

~ C HEM

I~

Rev. J

~bAWG

WHITE

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7-22

2
4
4

AIR
2
9

3
1
1
1
2
2
1
2
2

1

1
1
1
4
8

1
31
1

3f.i??9070-1001

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1
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------------------------

.1

. . VISIONS
nl [lASH NO.

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ALL

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REVISED PER fCO 7JOO-,o29(tURICAL) INT-'"

ECO 1300312~A\
(ECO 737002,.,5
DElETED PEQ [CO 73003181

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ALL
4002

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4"144

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I

NOTES:
I. L.OC: ...TE C:HARAC"TERS APPROXIMATELY Ao:.
SHO"""'N. ANO RU6SE.R S,..,tlMt=' IN RLACK. .IZ HIGH.

Z.
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FOR .LlST OF MATERIAL
SEE LM 63002242

50

"

REVISION UVEL OF DASH NO'S
4001

~6~~/'-~\,.~~~N/fe~,;~\.W!.~'T~~)e~TH~O~e%~&'T~~;RU~e.~,.

T... •. APPLY A

THIN

INSTALLATION

COAT 01' ITE"'"

OF

MICA

~, -TO HEAT

I~SI,)LATORS.

$INK

(ITEM'

..... .,_ ...
~i

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j

a. ~.."'~~~ij.;"1,g~ ~~~~ ~ ~~.. /~~(~~I~I... 18.21.2~.Z8 .. ~O

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DRIVER: BOARD
THE 1"'~1'IC*I(!OMT.lllmNllnIN.
~IITAfI" NeIll MOTTO ... "ELEASlD
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II ""T

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- d...:....

Figure 7-190 COMPONENT BOARD ASSEMBLY,
POWER DRIVER BOARD
7-23

Rev. K

LIST OF MATERIALS
PC BD ASSY DRIVER BOARD

DESCRIPTION

1
2
3
4
5
6
7
8
9
14
15
17
18
19
20
21
23
24
26
26
28
29
33
35
35A

PC BD AW POWER DRIVER BOARD
BRKT HEAT SINK DRIVER BOARD

63001018-2001
63002200-2001
63002233-5001
63002234-2001
63011159-5001
31230011-1001
22405002-1001
39610000-0005
39690200-0022
38040020-1001
38100904-1001
43158105-1001
43820055-1001
41471926-1001
41472926-1001
41102926-1001
41120026-1001
41471026-1001
34912087-2001
41103926-1001
41101016-1001
40680325-1001
38202648-1001
38200312-1001
38200311-1001

3b 38300050-1001

37
39
41
42
44
45
46
47
49
54
56
57
58
59
60
61
62
63
64
999
999

Rev.K

QTY

ITEM PART NO

38239040-1001
30050000-0001
34815005-2001
34712005-2001
30000000-0001
30070000-0001
34517105-2001
34517125-2001
34517165-2001
63002300-2001
35000004-2005
21104000-1001
22256000-1001
41222926-1001
41102026-1001
41221926-1001
38000004-1001
38239060-1001
34912087-2001
63001019-9001
63002275-9001

SHIELD 101/101A
CABLE TRAY 101/101A
CLAMP ASSY

CONN EDGE 10POSN 2-ROW tIDM
CAP ELCTLT 4UF 150V -10+5OY.
WIRE UN-INSUl SOLID 22AWG
TUBING PLSTC 22AWGID NAT
SEMICOND DIODE TBAX
IN4002
SEMlCOND DIODE TBAX
IN4148
RES WW 1.5 OHM lOW 5Y.
RES WW 82 OHM 5W 5Y.
RES CARBON 470 OHM 114101 lOX
RES CARBON 4. 7K OHM 1/4W lOY.
RES CARBON lK OHM 1/4101 lOY.
RES CARBON 12 OHM 2W lOX
RES CARBON 470 OHM 2W lOX
WSHR FLAT 14X.25 .032THK
RES CARBON 10K OHM 1/4W lOY.
RES CARBON 100 OHM 1101 lOX
RES WW 6S OHM 3. 25W 5X
SEtlICOND XSTR PWR (33B) EP2648
SEMICOND XSTR
WII1ICA TIP31B

SEMICOND XSTR WIKICA TIP31A
·SEMlCOND XSTR NPN HV AMPl
SEt1ICOND XSTR GP
- 2N3904
COMPOUND THRK CNDCT SILICONE
WSHR lOCK INIl TOOTH 14 SST

NUT HEX 4-40 XMOM THK SST
VARNISH INSULATING RED
SOLDER 60/40 .0320 WIRE
SCR PNH REC 4-40X. 3ll SST
SCR PNH REC 4-40X. 38L SST
SCR PNH REC 4-4OX. 50L SST
CLIP, P.C. BOARD ,

WSHR SHOULDER 14X. 1871 NVL
CAP CER DISC . lUF 25V 201.
CAP ElCTLT 25UF 12V -10+75Y.
RES CARBON 2. 2K OHM 1I4W lOX

RES CARBON lK OHM 2W lOY.
RES CARBON 220 OHM 1/4W lOY.
S~MlCOND DIODE TBAX 4. 7V
SEMICOND XSTR PNP GP
2N39Ob
WSHR FLAT 14X.25 .032TH1(
PC BD DD POWER DRIVER BOARD
SCHEM DIAG PWR DRIVER BOARD

7-24

1. 0000

1.0000
1. 0000
1. 0000
1. 0000
1. 0000

7.0000
AIR
AIR

10.0000
16.0000
7.0000
7.0000
15.0000
17.0000
5.0000
2. 0000
3.0000

10.0000
7.0000
3.0000

7.0000
7.0000
12. 0000
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8.0000
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21. 0000

18.0000
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6.0000
3.0000
12. 0000
2. 0000 .

10.0000
1. 0000
1. 0000
3.0000.
1. 0000
1. 0000

2. 0000
1.0000
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AIR
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5. CONFOfi,MAL CO,A.TIN& SHOUl.D BE APPLIED TO
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SCREW HEADS HOLDIN~ OPTIC BLOCK IN PL.ACE

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e~.
THE E.MITTER
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"TO E.~.

-'.

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OF OPTICS BLOCK) BL..ACk;: OOT (CATHODtE). CASE

_

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I

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I

DRAWINGS:

SC~EMATIC DIAGRAM C ~0A1oAoCI' QI.I\.Y'

o

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Figure 7-21.

COMPONENT BOARD ASSEMBLY, +5 VOLT REGULATOR

~

0

----

1 . - " ,_ _

..,_AN:>K

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c;.,JOIII~2

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SELECT ONE ONLY,

A

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COMro'-iENT BQ.l.R) ASSEMBL "
+~,\

::>CWER SUPPl)

I:>') SER:ES

A

LIST OF MATERIALS
PC BOARD ASSEMBLY
+5V POWER SUPPLY
(Ref: Ass·y #63011142-4001, Rev. A2)
ITEM
1
2
1

4

5
h

7
7A
8
9

10
11

12
13
14
15
16
17
18
19
20
23
24
25
26
27
28
29
30
31
32
35
36

REF
REF

Rev. J

PA~T

NO.

63011036-2001
63011144-2001
21104001-1001
21'502001-1001
21102000-1001
22107002-1001
38130901-1001
38130905-1001
38052350-1001
3520}233-1001
41751926-1001
46102000-1001
41222926-1001
1.. 1220926-1001
40127000-1001
41101926-1001
41102926-1001
41411926-1001
38244420-1001
38200311-1001
38200332-1001
34517127-2001
34:>17167-2001
3481~007-2001

NOMENCLArURE
PCB J) A~J

'j V

QTY PER
P WR SUP 1 00 S ER

l1RACKET liS 51/ PWR SUP 100 SEt{
CAP CERAMIC DISC
.1UF 16V
CAP CERAMIC uISC .OOSUF 1KV
CAP CERAMIC DISC .00lUF
1KV
CAP ELEC1ROLYTIC
100UF 25V
UIODE Sl KECTIFIER 30S1
DIUDE RECTIFlER 3 AMP
01 ODE

I N5235

ZE,~EK

I C REGULATOR UA723CN
RES CARBON 750 OHM 1/4W 10%
pnrENTIOMETE~ lK 1/2W 10%
RES CARBON 2.2 K
1/4W 10%
RES CARBON 22 OHM 1/4W 10%
RES CARBON .125 OHM 5W 5%
KES CARB0N 100 OHM 1/4W lOt
RES CARBON
1 K
1/4W 10%
RES CARBUN 470 OHM 1/4W 10%
TRANSISTOR
2N4442
fRANSISTUR TIP 31A
TRANSISTOR TIP 33B
SCREW 4/40X3/8 PAN HO PHIL
SCREW 4/40Xl/2 PAN HD PHIL
. wASHEk

#4

INf TOOTH LOCK

34712007-2001
30050000-0001
30000000-0001
30070000-0001
39690200-0009

NUT HEX 4/40
SILICONE COMPOUNu
INSULATING VARNISH

35000004-2CJ05

W~SHER-NYLON

34912007-2001
35010003-2002
35070003-2001
63011037-900l
630l1143-9001

SOLDER

fUBING

TFT 200 #9 NAT
INSULATOR #4X3/16
WASHER #4 fLAT
rRl~NSIST;jR MOUNTING PAD
TRANSISTOR MOUNTING PAD
PC BO 00 5V PWR SUP 100 SER
SCHEM

7-28

T~FLON

DI~G

5V PWR SUP 100 SER

1

1
2
1
1
1

4
AIR
1

1
1

1
1
1
1

1
1
1

1
1

1
2
2
4
4
AIR
AIR
AIR
AIR
1
2

1
1

AIR

AIR

- - - - - - - - - .. - - - - - - - - - - -... -.-..-----.---.--------------.-------::.:":I:-::y:-:.-=S:-:.O:":N::-:S;---------,.r
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REF-EP.ENCE
: ·... :f.'·!I\TI· :
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00110-'

---------------------.----------Figure 7-22.

COMPONENT BOARD ASSEMBLY, ~12V REGULATOR

3 \I
000

.nt-

..... t -

LIST OF MATERIALS
BOARD ASSEMBLY
-12V REG. uA273C
(Ref: Ass'y #63002304-4001, Rev. E2)
~C

ITEM
1
2

3
4

5
6

7
8
11
12
12A
12B
13
16
17
18
19
20
21
23 .
24
25
26
28
29
3D
31
35
36

37
39
40
41
42
43

44
45
46

REF
REF

Rev. J

PART NO.

NOMENCLATURE

63001048-2001
63002205-2001
22108000-1001
21104000-1001
21104001-1001
21471003-1001
22106002-1001
21101001-1001
38040020-1001
38052460-1001
38052461-1001
38052462-1001
35207233-1001
41220926-1001
41158945-1001
41202925-1001
461020DO-I001
41302925-1001
41101926-1001
41242925-1001
41122926-1001
41331026-1001
41410926-1001
38244420-1001
38200312-1001
38200321-1001
38239060-1001
34511105-2001
34517145-2001
34815005-2001
34112005-2001
30050000-0001
30000000-0001

PC BD AN 12V POWER SUPPLY
BRACKET HEAT SINK
CAP ELCTlT 1000UF 50V -10+751
CAP CER DISC .• 1UF 25V 20~
CAP CER DISC .IUF 16V -20+801
CAP CER DISC 470PF lKV 201
CAP ELCTLT lOUF 25V -10+751
CAP CER DISC 100PF lKV 201
SEMICOND DIODE TB~X
IN4002
SEMICOND DIODE TBAX
IN5246
SEMICOND DIODE TBAX
1N5246A
SEMICOND DIODE TBAX
IN5246B
IC VOLTAGE REGULATOR
723
RES CARBON 22 OHM 1/4W 101
RES CARBON 1.5 OHM 1/2W 51
RES CARBON 2K OHM 1/4W 51
POT PC MTG lK OHM 1/2W 101
RES CARBON 3K OHM l/4W 51
RES CARBON laO OHM 1/4W 101
RES CARBON 2.4K OHM 1/4W 51
RES CARBON 1.2K OHM 1/4W 101
RES CARBON 330 OHM 2W 101
RES CARBON 41 OHM 1/~W 10%
SEMICOND THYR PWR
2N4442
SEMICO~D XSTR
W/MICA TIP31B
SEMICOND XSTR PNP
TIP32A
SEMICOND XSTR PNP GP
2N3906
SCR PNH REC 4-40X.31l SST
SCR PNH REC 4-40X.44L SST
WSHR LOCK (NTL TOOTH
SST
NUT HEX 4-40 X MOM THK SST
COMPOU~D THRH CNOCT SILICONE
VARNISH INSULATI~G RED
SOLDER 60/40 .032D WIRE
STRAP CABLE ADJ lKG 2.0BDL
CAP CER DISC 5000PF 1KV 201
WSHR FLAT '4X.25 00
WSHR SHOULDER .4X.031L NYl
PC BD DO 12V POWER SUPPLY
SCHEM DIAG 12V RE~ UA723C

3007DOOO-0001
39690010-2005
21502001-1001
34900001-2001

35000004-2001
63001049-9001

63002308-9001

QTY PER

.4

7-30

1
1

2
2

2
1
2
1
6
2
AIR
AIR
2
2
2
1
2
3
3
1

1
1
1

2
1

1
2

2
2
4
4
AIR
AIR
AIR
1
2
2
2
AIR
AIR

-_

_ _n. _ _ _

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---....

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NO. 63002332

REV -

\

NOTES~

I.
~.

THE CHARACTER"E"'5 F··.;.k REF(,PfNCk: Clf~L'r
ANI: Does NOT APPEAR eN B;JAkl,;,
ADD 1<£'( TO C:ONN',C,.·.
oJl T.I~·~'JS ---'::I'~cD
AS SHOWN.

.,F-'::

I-+-......-+--+----~-+----......~~-~--TJ
1 ~-J-J - - J

I
R£FERI!NCE'

ORA\~

IN

,=.,:

HAF-lOMENCLA ~ URE

63001066-2001
63002253-4001
31230008-1001
31230037-1001
30070000-0001
3'-:1610000-0007
3Q6Q0200-001d
6300l067-9001
63002330-QOOl

PC BO AW CON'IJEC TUR CD 101llOlA
HAR-NfSS .t~SS Y WI
CO!>JNEC TOK EDGE l2 PIN
CllN0JECTOI{ EDGE 44 PIN
SOLDER
~~ IKE 8US~ #l8AwG
TLJHlNG Tr-FLON TFT ZOO #18 NAT
PC 80 DO CO!'JNEC TOR CO lOll lOlA
1'\~TERCON1'4EC

7-32

TI ON DIAGRAM'

QTv PER
1

1
2
6

AIR
AIR
AIR
AIR
AIR

7

8

6

2

3

5

IIVIIIONI
~W$CD

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G

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•

3

Figure 7--24. COMPD.NENTBOARD ASSEMBLY, MOTOR CONTROL (OPTIONAL)

2

LIST OF MATERIALS
PC BOARD ASSEMBLY
MOTOR CONTROL OPTION

(Ref: Ass'y #63011130-4001, Rev. G)

ITEM
1
2
3

5
6

7
8

10
11
13
13A

14
15
16
17
19
19A

20
22
23
24
25
26
27
28
29

30
31
32
- 34
315

40
45
46
47
48

REF
REF

Rev. J

PART NO.

NOMENCLAIURE

63011021-2001
63002380-2001
-36600004- 2004
22106002-1001
21104001-1001
22107002-1001
21104002-1001
38100904-1001
3H040020-1001
37220015-1001
37220016-1001
35474121-1001
35205550-1001
.J5474040-1001
35474100-1001
38200002-1001
38200146-1001
38200001-1001
41221926-1001
41102926-1001
43153055-1001
4139.3926-1001
41684926-1001
4110102S-1001
41510015-1001
41101946-1001

PC BO AW MTR CTRL
BRACKET MOUNTING
STANDOFF LCBS-8 PLASTIC
CAP ELEC'KOlYTIC
10UF 25V
CAP CERAMIC DISC
.1UF 16V
CAP ELECfROLYTIC
100UF 25V
CAP CERAMIC VISC .1UF 500V
D lODE
wG904
OIOD~ SI RECTIFIER IN4002
PHOTOTRANSlSTOR CA2-55
PHOTOTRANSISTOR MCA2-55
INTEGRAT~O CIRCUIT 74121
INTEGRATlD CIRCUIT NE55~
INTEGRATlU CIRCUIT 7404
INTEGRAT~D CIRCUIT
1410

4110~926-1001

43502035-1001
30070000-0001
6301114Q-4001
63002590-4001
63011137-2001
34517101-2001
34~12004-2001

30000000-0001
-34712007- 200 1
63011022-9001
63011131-9001

TRANSISTtJR SCR
TRANSISTOR SC146
TRANSISTUR SCR
KE.S CARBuN 220 OHM 1/4W 10%
RES CAR B~} N
1 K
1/4 W 10 ~
RES WW l~K 5W 5%
RES CARBON 39 K 1/4W 10%
RES CARBUN 680 K
1/4W 10*
RES CARBUN 100 OHM 2W 5%
RES 51 OI1M lW 5%
RES CARBON 100 OHM 1/2W 10%
RES CARBON 1 MEG 1/4 W 10%
R~S ww 5~ 3W 5%
SOLDER
HARNESS ASSEMBLY
hARNESS ASSY RETROFIT 101 LONG
COVER MT~ CTRl
SCREW 4/40X5/16 PAN HO PHIL
WASHER #4 FLAT NYLON
INSULATING VARNISH
NUT HEX 4/40
PC ~U DO MTR CTRL
SCHEM DIAGRAM MTR CTRl

7-34

OTY PER

1
1
4
2
3
1

1
1

4
1

AIR
1
1
1

1
1

AIR
1

1
3
1
1
1
1
1
1
1

1
AIR
1
1
1
1
1
AIR
1
AIR

AIR

6
~

5

3

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7

6

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Figure 7-25. HARNESS ASSEMBLY, MOTOR CONTROL

A
l.U

""_

2

9:

~.

HARNESS
~'OTVR

ASSEMBLY,

OONTROL

LIST OF MATERIALS
HARNESS ASSEMBLY

(Ref: Ass'y #63011149-4001, Rev. C)
ITEM
1
2
3
6
7
8
9

10
11
12
13
14

15
16
17
18
19
20
REF

Rev.,

J

PAR'r NO.
.31300007-1001
31240020-2004
39648505-0008-2
30070000-0001
39695231-2001
39648505-0006-1
396"8505-0006-8
39648505-0006-3
39648505-0006-4
39648505-0006-5
39648505-0006-6
39648505-0006-7
39648505-0006-91
39648505-0006-92
39648505-0006-93
39648505-0006-9
39648505-0006-97
39648505-0006-0
63011149-9001

NOMENCLATURE
CONN PLUG W/EAR 15PDSN .093
CONTACT CRP SKT .093 22-18AWG
WIRE TYPE B 18AWG RED
SOLDER 60/40 .032D WIRE
STRAP CABLE ADJ lKG .625BDL
WIRE TYPE B 22AWG BROWN
WIRE TYPE B 22AWG GRAY
WIRE TYPE B 22AWG ORANGE
WIRE TYPE B 22AWG YEllOW
WIRE TYPE B 22AWG GREEN
WIRE TYPE 8 22AWG BLUE
WIRE TYPE B 22AWGVIOLET
WIRE TYPE B 22AWG WHT/BRN
WIRE TYPE B 22AWG WHT/RED
WIRE TYPE B 22AWG WHT/ORN
WIRE TYPE B 22AWG WHITE
WIRE TYPE B 22AWG WHT/VIO
WIRE TYPE 8 22AWG BLACK
WIRE LIST MOTOR CONTROL STD

7-36

QTY PER
1
15
1

AIR
3

.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.'5
.5
.5

."F'~RI. ... CIE

C."WINC;.

wllt'''.01''6RAM-",,002l.7
WIRINe

1'101

E~:

I.

Z.

(rn ... ~\ It>~ cmQ tucT1UCH. ~T'_.
ATT,..C. ... WHITE, WIAI! (WITH .5PLI"a)OF POWER C"eL~
"..:Io ...... aL.y 'TO ......~l'MIl"'')WI . . ~I'\III.~''' 'TLIi':A),........,.(.'t .......)
..... 0 CJltIMP FIRMLY ~O~ c;;ocJO ELJlCTRIC:AL. CONNEC.TION.

4.

WNERE I .. SULATINCi VARNISH CITEM 4S) 15 USeD, A"'Pl.'!
To NuT. :-=UVNUT OR ....... ) SICS OF F~ST"N.R ••

5,
IS.

:::0
fT1

<

c...

~ '.S? CI' MA'ree .... "

5J:E TABLE ~OR A~~IOM8LY VARIATION.

see'

!'fi~~HT~~~~n~:';'r2~ "!b£L~~~ATIII'" ~~~~ ;;~;..'tZ'(L~~~.

.

~.

OIAc;."~".f~"500.I01

LM rJIOOliOS

_DOl WIno

.

'"=-~

:5:':"
~---4----I_.. ::..t- l~ii1:~t~':~SP~,~v,!i:

1---+---1

CH"'RAC:TEk, JI THJltU I . ARE FOR "&FliRe:Nce ONLY'
A .... O DO ..... 0 ' ArF'"E ........ ~H :...,ASS,'$.

Figure 7-26 .. ELECTRONIC CAVITY ASSEMBLY

(Ref:
ITEM
1
2
3
It

6
7

9
9A
11
12
13
14
15
16
17
18
19
2D
22
23
27
28
30
32
34
37
39
40
42
43

49
54
57
58
59
6D

REF
REF

Rev. J

LIST OF MATERIALS
ELECTRONIC CAVITY ASS'Y
Ass'y No. 63001105-4001, Rev. Y)
QTY PER

PART NO.

NOMENCLATURE

63002227-5001
63002332-4001
63002237-5001
63002353-2001
30470000-1001
33400000-2001
63002252-4001
63()02494-4001
39030012-1001
22229000-1001
22828000-1001
43471056-1001
38125021-1001
38040020-1001
39030002-1001
39()30011-1001
39030004-1001
31350000-2001
36150001-2004
31460014-2003
34517127-2001
34517287-2001
34517207-2001
34527087-2001
34712007-2001
34912007-2001
34815007-2001
34517101-2001
30010000-0001
30000000-0001
63tl11146-5001
63J11151-5002
31460013-2001
34517087-2001
39620006-2003
39690011-2002
63002267-9001

CHASSIS ASSY ElEC CAVITY
COMP BD ASSY CONNECTOR BO lOlA
CLAMP CAPACITOR 101/101A
SPEAKER BRKT IOI/IDlA
SPEAKER 8 OHM .5W 3.0SQ
RIVET DOME HD MDRl .1250 X.Z5L
POWER CABLE ASSY W3
POWER CABLE ASSY W3 1IDY
FUSE GL .25DIA 8A SLOW 1.25L
CAP CYl 22000UF 50V -10+15%
CAP CYl 8200UF 50V -10+751
RES WW 470 OHM 5W ID~
DIODE BRIDGE
SEMICOND DIODE TBAX
1 N4002
1.25L
FUSE GL .2501A 2A
FUSE GL .25DIA 3A 250Y 1.25L
FUSE GL .25DIA 5A SLOW 1.25L
FUSEHOlDER PNl MTG 250V 15A
CLAMP CABLE .3120 PlSTC
TERM RING INSUl .10 22-18AWG
SCR PNH REC 4-40X.38l
SCR PNH REC 4-40X.81l
SCR PNH REC 4-40X.62L
SCR PNH REC 6-32X.25l
NUT HEX 4-40 X MOM THK
WSHR FLAT t4X.OO 00
WSHR LOCK INTl TOOTH '4
SCR PNH REC 4-4DX.31l
SOLDER 60/40 .032~ WIRE
VARNISH INSULATING RED
STRAP BRKT ASSY 10l/101A 102A
FUSE BRKT & FlTR ASSY 101 SER
TERM RING INSUl
16-14AWG
SCR PNH REC 4-40X.25L
WRAP HARNESS .18-l.50IA PLSTC
STRAP CABLE SELF MTG 1.15BDL
WIRI~G OIAS ELECTRONICS CAVITY
WIRING DIAG ELECTRONICS CAVITY

63004104~9001

.6

7-38

1
1
1
1

1
2
1

AIR
1

1
1
1
1
1
2
1
1

5
1
2
4

1
16
1
25
2

25
2
AIR
A/R
2
1

1
4
.7
1
A/R
A/R

-------·-.------. .--V-~I-IO...,.N--I------.,..-- --_.---._- - - - - .

REVISIONS
ADDI.D ITEMS 10 """U ,. "0 LIM
""MI:. P,C.'":'"UR\::.. AOCE.l; FU5E HO\.t)E~t

I!V'
A

Ai0.60 2.00' ..... OIf'twl.TO PIC"TURIIL..
'PER ECO .... 0.73002 III
$f· ....... Z·?

~--------------------------zo.~c~.

-----------------~--

_______________________________ I

~--~T--------~~----------------~--~~----------------------·2aO~~.

WIRE

LE.~£ ...

WIRE.

I.J

TO
LEAD
<-......
,) LENSTU

PI3'P'NI
+ CAP (ItO.,)

es..sO
".00

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Ie.
18

tltV AC

If!

+30'1

",e14

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:;i'~' i"l_

ITOot NO

I'!>

+~

+!O\ klHJ\oo ....
!Cv ::.~ ...:I'I.:=I ..

,10..: -.......~ ... -;:;t.

II.
17
18

NOTES
~W1~NOr~_7IIP Ar_~

"._1CJI

VIEW

7r:I_oSnfl""'I!iD
.47SIW. A007W\iWla.~~.,S...- ..

. - - ST""~ .160~ Cll4C.Y.J
JlSTRIP ALL LEADS _ _

.ZSO.w.
.!/. USG I~

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.,:)N,.y

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~ FOR

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I

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C5.L-'"-c.

I

CA~I""'f

,,~...,

A.'"::ts,....

fi300et!sz

- /i5

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w~CII12~

_. ".

•••• , lUll'.'.'

Figure 7-27.

MA~IAL

LIST OF
L.. ..... C<>30022S~

IN~::::

CAP .... !:. AScy-

........c. CA.".TV

WI HARNESS ASSEMBl Y .

_

i:

:~~~I ~~~~~~--~R:.~~~~.~~~:O~.ot,·,j ~ ~ t·.~

16:~00225 3

·;;''It·.~-4-~''·

1

W

i

(Ref:

ITEM
1
2
3
4
5

6
7
8

9
10
11
15
16
17
18
19
20

21
22
23
24
25
26
27
28
29
30
31
32
33

Rev .. J

LIST OF MATERIALS
HARNESS ASSEMBLY WI

Ass'y #63002253-4001, Rev. l)

PART NO.

NOMENCLATURE

31300007-1001
31240020-2004
39640000-0008-2
39640000-0009-9
39640000-0009-0
39690000-0002
31460014-2003
30070000-0001
36550002-3001
36550002-3012
36550002-3070
36550002-3002
36550002-3003
36550002-3004
36550002-3005
36550002-3006
36550002-3007
36550002-3008
36550002-3009
36550002-3010
36550002-3071
36550002-3072
36550002-3073
36550002-3014
36550002-3075
36550002-3016
36550002-3077
36550002-3078
36550002-3019
3124002D-2001

CONN PLUG W/EAR 15PDSN .093
CONTACT CRP SKT .093 22-1BAWG
WIRE TYPE E leAWG RED
WIRE TYPE E 16AWG WHITE
WIRE TYPE E 16AWG BLACK
TAPE LACING .06W X.OITHK BLK
TERM RING INSUl .10 22-18AWG
SOLDER 60/40 .0320 WIRE
MARKER WIRE WRAP-~ROUNO
1
MARKER WIRE WRAP
12
70
MARKER WIRE WRAP
MARKER WIRE WRAP-AROUND
2
3
MARKER WIRE WRAP
4
MARKER WIRE WRAP
5
MARKER WIRE WRAP
6
MARKER WlRE WRAP
7
MARKER WIRE WRAP
8
MARKER WIRE WRAP
9
MARKER WIRE WRAP
MARKER WIRE WRAP
10
MARKER WIRE WRAP
71
72
MARKER WIRE WRAP
73
MARKER WIRE WRAP
74
MARKER WIRE WRAP
75
MARKER WIRE WRAP
76
MARKER WIRE WRAP
77
MARKER WIRE WRAP
78
MARKER WIRE WRAP
79
MARKER WIRE WRAP
CONTACT CRP SKT .093 20-14~WG

7-40

QTY PER
1
9
AIR
AIR
AIR
AIR
6
AIR
1
1

1
2
1
1
1
1
1
1
1
1

1
1
1
1
1
1
1

1
1
2

-~__~8____~I~

___
' __7______~I_______6 ______J~_____5______~+_______A______J~______
3 ______1~_r---2----~~1~----1--~'IIVISIONS

u.

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(I~ A'

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.... RU

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TABLE I
~5H ~'~: ~~j ~'rlf ~ln4o

oJ 14-35
J 14-3(;'

P-IO

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a

14-35

P-4

p-o

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c

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J 14-3!5
J 14-3!\

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...

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T

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BOARD F'0i< !>TRAJU FI£.L..IEF.
4.
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I t

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Figure 7-28._

I

'm

uSE

3

W2 CABLE ASSEMBLY, COMPUTER INPUT

l;;r"

I

2

--

Ne»7£j D
-- I

I

r

63002258"

.. ~IDO--'-J

1

LIST OF MATERIALS
CABLE ASSEMBLY W2
(Ref: Ass'y #63002258-4001, Rev. K)

ITEM
1
2
3
It

5

6
9
14
15
REF

Rev. J

QTY PER

PART NO.

NOMENCLATURE

63001024-2001
31310019-1016
311t60015-20D3
39648505-0004-0
39648505-0004-9
3961t8505-0004-4
30070000-D001
39660015-0001
39695231-20D1
63001025-9001

PC 80 AW PARALLEL TIMER FIN Bo
CONN RCPT PNL 36POSN NON-PlI
26-22AWG
TERM RING INSUL
WIRE TYPE B 26AWG BLACK
WIRE TYPE 8 26AWGWHITE
WIRE TYPE B 26AWG YELLOW
SOLDER 60/40 .0320 WIRE
CABLE 1TW PR 26AWG
STRAP CABLE AOJ LKG .625BDL
PC BD DO PARAllEL TIMER FIN BO

.8

7-42

1

1
1

2.1
2
11

AIR
10.1
6

....- - - - - - - - - 8 ' · 0"

--------------1

REVISIONS
na

r~';~l
PI

DUC . . 'flON

C

~VI~

p~

o

~"''!>eD

--___

SE.E.~TE."2

.

1."",17

E.

RE.VI!.EO

F

RENIcz,EO

'PER ECC

.-

1 '-I;

.__

-n....H 31c::x:rl

730,'50:i ...........'>

''';~::h

HE-IUREFI



I
W

DESCRIPTION

SOURCE

DESTINATION(S}

SIGNAL
NAME

DESCR I PTl ON

SOURCE

DESTINATION(S}

ECSTB

Inverse of ECSTB.

25-6/16-3

29-4/16-3, 12-4/16-2

rvr

Inverse of LVT.

3-6/15-2

3-12/15-2, 3-2/15-2

ElW

End of Print - Indicates that the
right-hand 1 imit switch has been
activated by the carriage.

19-6/16-1

15-4/16-1

ORBZ

OR function of busy condition.

12-8/16-2

6-1/15-2

OR8Z

Inverse of ORBZ.

6-2/15-2

15-6/15-2

EOPSW

End of print switch.

EOP Switch

21-1/16-1,
6-1, 2/16-2

OSC

10-6/15-1

6-3/15-1, 6-5/15-1,
22-1/15-3

FCCLK

First Character Clock - Indicates
that at least one printable character has been received for that
line.

11-11/16-2

19-11/16-2

Oscillator timing - 100 KHz clock
signal provides timing for printer
operations.

OSC'

I nverse of

6-4/15-1

9-1/16-2, 6-10/16-2,
2-5/15-2, 22-5/15-2,
2-1/15-2

IT

Decoded form feed code.

25-6/15-1

8-9/15-2

OSC'

Inverse of OSC'.

17-2/16-2

9-5/16-2

FWD

Forward mode.

14-4/16-1

25-12. 13/16-3

OSCXT

Punched hole indication "from
paper tape reader.

16-6/15-2

7 -3/15-2
via E7 to E8

Timing signal for printer's interface boards.

6-6/15-1

HL

PE

Paper empty (out) signal indicating
a paper out condition.

30-4/15-3

P6-K/15-3
Interface ConMctor

He

Inverse of HL.

14-6/15-2

16-5/15-2,
7-11/15-2

PI

Inverse of PE-

1-10/15-3

30-3/15-3, 8-5/15-3

7-12/15-2

PM

Paper movement signal.

5-6/15-3

11-9/15-3, 6-9/15-3,
6-11/15-3

15M

Inverse of PM.

6-8/15-3

11-10/15-3,
11-11/15-3,
7 -6/15-3,
15-1/15-2

PMSOL

Paper movement solenoid - Used
to activate line feed solenoid
during a line feed, form feed or
vertical tab operation.

7-4/15-3

P6-8/15-3

liS"

OSC.

P6-7/15-1,
I Interface
Connecter

Signal generated to assure that a
hole sensed by the tape reader
for the last paper movel'1ent
corrrnand will not be interpreted
as a hole condition by the next
paper movement cOlTllland.

2-8/15-2

INPUT

Input Prime line from the interface connector.

P5-B/15-3

4-3/15-3

TP

Input Prime signal causing the
printer electronics to be primed.

4-6/15-3

5-12/15-3,
13-12/15-2

LD

Light detect.

10-3/16-2

Interface connector

PMTO

Paper movement time-out.

Q8/15-3

7-5/15-3

[0

Inverse of light detect.

5-8/16-2

12-11/16-2,
13-4/15-3

PRIME

22-13/15-3

9-2/15-2, 8-9/16-1,
27-6, 7/16-3,
9-3/16-2

LF

Line feed 15-mill isecond pulse.

17-4/15-3

5-4/15-3

A 3-millisecond pulse used to
prime or reset the printer
e 1ectroni cs •

22-12/15-3

8-8/15-2

6-13/15-2, 14-4/15-2

Inverse of PRIME on Card *1.

Li ne feed function.

PiITMr

LFF

(Card U)

26-2, 12/15-3,
2-6/15-2, 2-2/15-2

TIt

Inverse of LFF.

8-12/15-2

8-11/15-2, 3-1/15-2

PRIME
(Card Il)

Inverse of PRIME on Card 112.

8-8/16-1

LVT

Vertical tab function.

3-11/15-2

3-4/15-2, 14-2/15-2

20-9/16-1, 22-4/16-1,
15-1/16-1. 11-4/16-2,
11-10/16-2,
9-6, 7/16-2

PRIME

SIGNAL
NAME

DESCRIPTION

SOURCE

DESTINATION(S)

l5lrnOS

Prime pulse.

17-12/15-2

22-2/15-3

PWCl,
PWC2.
PWC4

Pulse Width Counts 1. 2. 4 counter outputs used to gel"erate
timing for "full-step" character
generator.

MEZ7/16-3

ME3D/16-3

PWC01.
PWC02.
PWCfl4

Pulse Width Counts 1. 2.4counter outputs used to generate
timing for "half-step" character
generatoJ:.

MEZ4/16-3

PWR PRIME

A 100-millisecond pulse generated
by turning on power to the printer
and used to initialize the printer
electronics.

4-12/15-Z

PWR PRIME

I nverse of PWR PRIME.

ME28/16-3

14-11/16-1

.

,

5-3/15-Z

17-10/15-Z.
4-13/15-2.
5-13/15-3.
11-3/15-3.
17-3/15-3.
19-4/16-1

SIGNAL
NAME

-,'SOURCE

DESTINATION(S)

Ri'P

I nverse of RTP.

21-8/16-1

21-12/16-1. 15-1,.
13/16-1. 22-3/59-1

SCR

Decoded CR preceded by printable
character.

9-4/15-1

17-11/16-2.
9-14/16-2.

SCR

Inverse of SCR.

7-10/16-2

12-9/15-2

SEL

Select function.

5-12/16-1

15-12/15':'2.
5-6/16-2

SEL

Inverse of SEL.

5-13/16-1

5-9. 10/69-3
13-13/60-2

SELCLK

Select function.

10-11/16-2

5-1/15-1

SELECT
LAMP

Signal used to turn on select indicator lamp on front panel.

Ql/59-1

Select lamp on
opera tor control
panel.

SLCT

Select status 1ine to interface
connector.

5-8/15-3

Interface
connector

SRCL

Signal used to clear shift registers
by placing zeros in their input
during a prime condition.

11-6/16-2

4-4.
3-4.
2-4.
1-4.

15-2/16-1

DESCRIPTION

13/16-2.
13/16-1.
13/16-1.
13/16-1

Ready carri age return.

13-8/16-2

REMSEL

Remote select/deselect.

31-8/15-1

10-13/16-2

ROMTB8

Enable signal used to select
optional character sets by use
of TSS.

E7/16-3

37-4. 1/16-3

SS

Safety switch.

1-4/15-1

Interface
connector

irnRlB8

31-10/16-3

37-12. 9/16-3

(+5V)

55

Inverse of SS.

Inverse of ROMTS8.

1-6/15-1

1-3/15-1. 1-l/15 rl
8-4/15-3

ROME2

Gated strobe

Z6-11/16-3

37-2. 10/16-3

Inverse of SS.

1-2/15-1

14-12116-1

RPTSW

Ready to print swi tch - output
from 1eft-hand limit swi tch s ignifying that carriage is at leftmost position.

17-4/16-1

20-2/16-1

S5
(tOV)

Ready to print switch.

RTP Switch

RDCR

RTPSW

RSVFD

Signal used to terminate paper
movement during a form feed or
vertical tab function.

7-13/15-2

RTP

R~ady

21-11/16-1

to print - indicates that the
left-hand switch has been activated
by the carriage.

21-13/16-1.
17-3/16-1.
19-3/16-1
2-3/15-2

21-10/15-1. 5-7/16-2
5-7/16-2

I

STROBE

Print strobe (approximately 460
-18-6/16-1
usec) - triggered by output of video
ampl ifier and used to generate character address signals.

12-5/16-2. 13-6/16-2.
37-13/16-3.
29-1/16-3. 27-14/16-3
32-2116-3. 26-4/16-3

STROBE

I nverse of STROBE.

21-9/16-1

18-1/16-1

SVFD

Signal used to set VFD flip-flop.

3-3/15-2

2-14/15-2. 16-11/15-2

m

Memory output bit 1.

8-4/16-1

23-11/16-3.
14-2/16-~

SIGNAL
NAME

»I
U1

........

»I

0\

c...

DESCRIPTION

SOURCE

DESTINATION (5)

m

Memory output bft 2.

7-8/16-1

23-9/16-3. 13-12/16-2

TB3

Memory output bft 3.

7-10/16-1

23-13/16-3.
14-3/16-2

TB4

Memory output bft 4.

7-12/16-1

23-1/16-3. 8-5/16-2

TB5

Memory output bft 5.

7-6/16-1

23-3/16-3. 13-1/16-2

m

Memory output bit 6.

7-2/16-1

23-5/16-3. 13-2/16-2

TB7

Memory output bft 7.

8-10/16-2

13-3/16-2.
31-13/16-3

TB8

Memory output bf t 8.

8-2/16-2

20-1/16-1. £4/16-2

m

Inverse of T88.

8-12/16-2

8-1/16-2. 15-2/15-2.
19-10/16-2.
16-12/16-2.
9-2/16-2. £3/16-2
31-3/16-3

TO FWD
CLUTCH
DRIVER

Sfgnal used to energfze forward
clutch •

31-8/16-3

Clutch ,drfver

TOFRLF

Sfgnal used to actfvate top of
fonn functfon'.

OV,
R33/60-2

8-10/60-2, vfa
TOP OF FORM SW
(57), 12-9/15-3,
vfa LINE FEED SW
(58)

TRACK

Track pulse.

21-11/15-2

27-9/15-2

UCC

Upper case character mode
selectfon sfgnal.

16-3/16-1

20-10/16-1, 29-5/16-2.
26-5/16-3. 25-2/16-3

m-

Inverse of UCC.

20-8/16-1

16-2/16-1. 29-2/16-2,
26-2/16-3. 32-11. 3/
16-3

UPSC

Expanded character mode - conmand
to prfnt elongated characters.

23-8/16-1

16-1/16-1

VFO

Vertfcal fonnat decode.

2-13/15-2

7-2/15-2, 2-10/15-2.
5-5/15-3

VIDEO AMP

Vfdeo
ampliffer
24-6/15-1

18-5/16-1

vr

Vfdeo amplfffer sfgnal from vfdeo
amplfffer.
Vertfcal tab decode.

ZBCR

Decoded carriage return.

9-12/16-2

16-13/16-2

ZBCR

Inverse of ZBCR.

9-13/16-2

15-5/15-2

3-13/15-2

APPENDIX B
PARALLEL INTERFACE SPECIFICATIONS

All standard Centronics printers contain a common 7-bit parallel interface. An
optional eighth bit is available, as required by the user. Detailed information describing
the standard interface timing, signal descriptions, connectors and other specifications
are contained in this appendix. The .intent is to provide the user with the technical in ..
formation required to interface directly to a standard Centronics printer, or if necessary to design a special interface to adapt the printer to a particular terminal. Note that
specifications and descriptions within this appendix apply to Centronics standard RO
printer models and do not necessarily apply to Centronics teleprinter models 308, 330,
508, 530 and 761.

8-1

REV. J

,-------".- ----------

INTERFACE TIMING

PARALLEL DATA
DATA

~J'J%I~

r-

STROB~:~I~s) .,l~~i J.-

L-J~-----------------------

----1
'-- 1.0 us (MIN)
~
r 500 us (MAX)
ACKNOWLEDGE ___________________________________
--,

!~I-ACK--r-

i - - A C K DELAY--------......
(For Normal Data)

I

BUSY

Wffffl#$t1
~USY----.j

ACK DELAY
(For Busy Condition)

! - I_ _ _ _ _ _ _ __

y--..J

,

BUSY DE LA

-..j

NORMAL DATA INPUT TIMING
101/10IA/10IS 10lAL

102A

102AL

103

104

301

306

306C

306SC

ACK DELAY

7 usec.

2.5·10 usee.

7 usec.

2.5·10 usec.

2.5-10 usec.

2,5-10 usee. "

2.5-10 usee.

2.5-10 usee.

2.5-10 usee.

2.5-10 usee.

ACK

4 usec.

2.5·5.0 usec.

4 usec_

2.5·5.0 usec.

2.5-5.0 usec.

2.5-5.0 usec.

2.5-5.0 usec.

2.5-5.0 usee.

2.5-5.0 usec.

2_5-5.0 usec_

BUSY CONDITION TIMING
r-------.------r----------~~----_,

BUSY DELAY

0-1.5 usee.

0-1.5 usee.

0-1.5 usee_

0-1.5 usee.

0-1_5 usec.

0-1.5 usec.

0-1.5 usee_

0-1.5 usec_

ACK DELAY

0-10 usee.

0-10 usee.

0-10 usec.

0-10 uset.

0-10 usec.

0-10 usee.

0-10 usec.

0-10 usec.

2.5-5.0 u,ec.

2.5-5.0 usec.

~.5-5.0

2.5-5.0 usee.

2_5·5_0 usee.

2.5-5.0 usee.

2.5-5.0 usee.

10 msee.
(Single LF)
25 msee.
(double LF)
70-77 msee.
(mult.ple LF)

70-100 msee.

75-IOS msec.

75-105 msec
(SI"9 Ie L f)

35-50 msec_

4 usec.

ACK

2.5-5.0 usee.

4 usee.

75·105 rnsec.

75-105 msee.

16 msee.
(slOg Ie LF)
75-105 msee.
(multople Lf)

16 msee.
(smgle LF)
51 msec.
(double LF)
25·75 msee.
(mult.ple LF)

BUSY DURATION:
Line Feed

15-IOS ITlsee.

usee.

Verlical Tab (I·inch)

300-31001see.

300·310rnsec.

300-310msec.

300·310msee.

125nlSee.

125 msec.

160-200 msee.

300-310 msec.

300-310 msee.

15'>-1 70

Form Feed (11·inches)

3-3.5 see.

3-3 5 see.

3-3.!> sec.

3-3.5 see.

1.4 see.

1.4 sec.

1.!>-2.0 see.

3·3.5 see.

3-3.5 s.c.

1.40-1.42 sec.

Del.le

3 msec.

100·400 u,ec.

3 msee.

100-400 usee.

160·400 usee. 100-400 usee.

100-400 usee.

100-400 usec..

100-400 us.c.

100-400 usec.

Bell

2 see.

S.lec·

2 ,pc.
100-400 u,ee.

3 rnsec.

100·400 usec.

100·400 usee. 100·400 usec..

100-400 usee.

100-400 usee.

100-400 usec.

I 00-400

Unt.1 pronter
.s selected

Untol pronter
.s selected

Unt.1 pronter
.s selecled

Untt! pronter
IS selecled

Until printer

Unit! pronter.
.s selected

Unt.1 pronter
IS selected

Unt.1 prontN
.s selected

6 msee./eha·
plus 70-100
msee. Lf

8.4 mc:,e( /char

IO{84/6.6/6.0
8.4 msec./ehar
",sec/char
plus 35-50
(10/12/15/16.5 ep.)

(270 msee.
max)

(270 msec.
max)

.s selecterl

Prinl Command

6 msee./cnar
plus 75-105
msec. LF

6 mSec./chdr
plus 15-105
m~ec. LF

470-500 msee.
(total)

410-415 msec.
(total)

6 .mec/char
plus 16
msec. LF

300 msec.

(Relurn time·no busy)

(240 m,ec.
max)

(240 msee.
max)

(0)

(0)

(0)

(0)

500

501

503

I

.s selected

plus 7~·1 O~
msee. LF

I

(270 tnsec.
mox)

NORMAL DATA INPUT TIMING
588

5000

5010

5880

700

701

ACK DELAY

2.5-10 usee.

2.5-10 Usec.

2.5-10 usee.

2.5-10 u'ee.

2.5-10 usee.

2.5-10 usee

2.5-10 usee

ACK

2.5-5.0 usee.

2.!>-5.0 usee.

2.5-5.0 usee.

2.5-5.0 usec.

2.5·5.0 usee.

2.5·5.0 usee.

2.5-5.0

BUSY DELAY

0-1.5 usee.

0-1.5 usee.

0·1.5 usee.

O·I.!> usec.

0-1.!> usee.

0-1.5 usee

0·1.5 u,ee.

0-1.5 usee.

0-1.!> usee.

ACK DELAY

0-10 usee.

0-10 usec.

0-10 usee.

0-10 usec.

O· 10 usee.

0- 10 usee.

0·10 usee.

0-10 usec.

0·10 usec.

AC.K

2.5-5.0 usee.

2.5-5.0 usee.

2.5-5:tl usee.

2.5·5.0 usee.

2.5-5.0 "see.

2.!>-!>.0 u,ee.

2.5·~.0

2.~-5.0

usec.

2.5-5.0 usee.

Line Feed

75-105 Insec.

70-100 msec.

16 msee.
75-105 msee.
(single LF)
51 msec.
(double LF)
25-75 msec.
(mult.ple LF)

20 ",sec.

20 msec.

20 msec.

75-105 msee.

75-105 msee.

u~ec.

2.5-10 usee.

2.5-10 usee.

2.5-~.0

2.5-5.0 usee.

usee.

BUSY CONDITION TIMING

usec.

BUSY DURATION:

Vertical Tab (I·inch)

300-310 msee.

160-200 msee.

125 msec.

.100.310 msec.

20 msec.

20 msec

;>0 msee.

240-270 msee. 240·270

Form Feed (l1·inches)

3-3.5 sec.

1.5-2.0 see_

1.4 see.

3.3.5 sec.

20 msec.

20 m,ee.

2001sec.

2_07·2_11 sec 2.07-2_11 sec

Delete

100-400 usee.

100-400 usee_

160-400 usee_ IOU 400 usee.

:00-400 usee. 100-400 usec. 100-400 usee.

m~ee_

100-400 usee. 100-400 usee.

Bell

S.lect"

100-400 "sec.

100-400 usee.

100-400 usec. 100-400 usee.

100-400 usee. 100-400 u'ec. 100-400 u,ee.

100-400 usee_ 100-400 usec.

Deselect

Unt.1 pronler
is selected

Unl.1 pronter
.s selected

IS

Unltl pronter
selected

Unt.1 printer
is selected

Unltl printer
.s selected

Unt.1 prtnter
.s sflected

8.4 msee./char
pillS 75-105
msee_ LF

6 mse(./ehar
plus 70-100
msec. LF

6 msee.lehar
plus 16
msec_ U'

11.3 msec./char
plus 1~·I05
msec. U-

8.4/7

6 m~ec./enar 11.3/9.4/6.9
.20 m,ee. LF rmH./ehar
(10;1;:/16.5 cp.)
+20 msec. LF

16.7 msee/Char 1~_ 7 msee/char

(10/12 cp.)
+20 m~ec LF

(400 msel.
max)

(400 msec.
max)

(0)

(400 m,ec.
max)

(400 msec
max)

(400 msee.
max)

2.2

Print Command

(Return time·no·busy)

m~ec./(har

Unt.1 pronte.
selected

IS

*No busy, " Inhibit prime on select option IS used.

REV. J

u~ee_

3 msec.
Until prlllter

Unt.1 pronter
'S ,elected

Des.1

m~ee_

B-2

Unltl pronter
.s selected

(400 msec.
max)

~ec

Until printer
is selected

(max) (0)

(270 msee.
max)

STANDARD INTERFACE SIGNALS
The following table describes the standard interface signals available at both the interface slot connector and
the external interface connector of all Centronics Printers.

J6·"N CONNECTOR
AMPHENOl NO. ~7·.0360
(CENTRONIC~ PART NO. 11l100I9· 10161

'--=;;;;;Y::;:';;;";=~J f;:N:FNA~l[
CONNECTOR

SIGNAL
NAME

INTER·
FACE
CONN.

INTER·
FACE
SLOT

SOURCE

(DATA
STROBE)

Pin I, 19

Pins 21, Y

Input Device

DATA 1
DATA 2
DATA 3
DATA4
DATA 5
DATA 6
DATA 7
DATAB

2,20
3, 21
4,22
5,23
6,24
7, 25

1B, V

9,27

16, T
17, U
20,X
15,5
11, N
19, W
12, P

Input
Input
Input
Input
Input
Input
Input
Input

ACKNLG

10, 2B

22, T

Printer

Acknowledge pulse indicates the input of a character into
memory or the end of a functional operation.

BUSY

11,29

3,C

Printer

A level indicating that the printer cannot receive data. For
conditions causing BUSY, refer to Busy Condition Timing
Table.

B, 26

DESCRIPTION
A 1.0 usec pulse (min.) used to clock data from the processor
to the printer logic.

Device Input data levels. A high represents a binary ONE, a low reDevice presents a ZERO. All printable characters (i.e., codes having
Device a ONE in DATA 6 or DATA 7) are stored in the printer
Device buffer. Control characters (i.e., codes having a ZERO in both
Device DATA 6 and DATA 7), are used to specify special control
Device functions. These codes are not stored in the buffer except
Device when they specify a print command and are preceded by at
Device least one printable character in that line.

PE

12

9

Printer

A level indicating that the printer is out of paper.

SLCT

13

F

Printer

A level indicating that the printer is selected.

± OV

14

7

Printer

Signal ground (Formerly SS signal, older version)

OSCXT

15

H

Printer

A 100 KHz signal (Models 101, lOlA, 102A, lOIS) or 100200 KHz signal (All other models).

±OV

16

A

Signal ground

Chassis Gnd

17

Printer

Frame ground

+5V

1B

13

Printer

+5 Volt power buss

(iNP'OT

31,30

L, 10

Input Device

A level which clears the printer buffer and initializes the
logic. (Not in 101).

FAULT

32

M

Printer

A level that indicates a printer fault condition such as paper
empty, light detect, or a deselect condit:on. (Not in 101).

Line Count
Pulse

34,35

2, D

PRIME)

Both sides of the line~ount switch appear at the interface
connector. This switch is opened and closed during each line
feed operation. A level delivered to the switch would be
pulsed off and on each time a line feed operation is performed.
(Series 300 and 500 except 306SC, 503).

Not Used

36

NOTES:
1. Second pin number indicates twisted pair return (± OV).

8-3

REV. J

INTERFACE SPECIFICATIONS
INTERFACE ADAPTER:

All Centronics prin~ers are designed to accept a special interface board. In some
models, this interf~ce slot is a standard feature. Other models must have an optional interface adapter to accommodate the interface card. Models which require
this optional adapter are the 301, 306, 306C, 500, 501, 588, 700 and 701.

INTERFACE SLOTS:

Models 102AL, 103, 104, 306SC and 503 have two interface slots. All other
models have one slot.

TOTAL AVAILABLE
INTERFACE POWER:

+5 Volts ± 5% at 800 mao
+12 Volts ± 10% at 200 mao
-12 Volts ± 10% at 200 mao

INTERFACE CIRCUIT
SPECI FICATIONS:
Voltage Levels:

OV and +5V (nominal), TTL logic (SN7400 series)

Logic Levels:

A logic ONE (or high) signal is defined as a voltage in the range of +2.,+ Volts to +5
Volts, not to exceed a peak positive voltage of +5.5 Volts.
A logic ZERO (or low) signal is defined as a voltage in the range of 0.0 Volt to +0.4
Volt, not to exceed a peak negative voltage of -.5 Volt.

Current Requirements:

The printer interface can source up to 0.320 ma at +2.4 Volts for a high signal output, and sink up to 14 ma for a low output.
Similarly, the sending device interface must be able to source 0.320 ma at +2.4
Volts for a high signal output and sink up to 14 ma for a low output.

Line Termination:

The printer interface terminates input data lines DATAl - DATA8 with 1000 ohms
to +5 Volts, and control lines DATA STROBE and INPUT PRIME with 470 ohms
to +5 Volts.

MAXIMUM DISTANCE:

A local interface should be located no more than 10 feet from the printer, when
using the standard printer interface circuits.

P~YSICAL

The diagram below shows the maximum envelope of a pc board which can be
accommodated by the interface slot in all current Centronics printers. The Series
102 printers may, however, require a slight modification to accept this board.
Depending on its depth, if the card is used in the 102A or in the second interface slot (nearest the speaker) of a 102AL, the speaker may have to be relocated to
the fan housing.

DIMENSIONS:

More detailed information on allowable dimensions for the interface board is contained on Centronics drawing 62000215.

SUNOHl
ll'lAClS

3.

ALL DIMENSIONS IN INCHES.

2.

,50 x.50 AREA FREE OF COMPONENTS
ANO ETCH BOTH SIDES. 2 PLACES.

1.

LOCATE KEYSLOTS AS FOLLOWS:
CONNECTOR Pl01 BETWEEN PINS 7 AND 8.
CONNECTOR Pt02 BETWEEN PINS 13 AND 14.

NOTES:

,EV. J

"""

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THE INFORMATION CONTAINED HEREIN IS
PROPRIETARY AND IS NOT TO BE RELEASED
OR REPRODUCED WITHOUT WRITTEN PERMISSION OF CENTRONICS data computer corp.

(617) 272-8545 (mass.)
(513) 294-0070 (ohio)
(714) 979-6650 (calif.)

centronics data computer (canada) ltd.
mississauga, ontario (416) 625-0770
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cheam, surrey (01) 643-0821/7
centronics data computer (germany) gmbh
6 frankfurt/main 663321/2

©Copyright 1976 Centronics Data Computer Corp.
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Specifications subject to change without notice.



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