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PREliMINARY
Maintenance Manual
for
MEMOREX MODEL 630
DISC DRIVE
PREFACE
The purpose of this manual is to instruct customer engineers in the proper
field maintenance of Memorex Model 630 disc pack drives.
Procedures for
installing one or more Model 630 drives are also included.
This manual contains a detailed description of the machine to aid in troubleshooting as well as in performing periodic maintenance routines. Necessary tools
for performing tests and making adjustments are also described.
If it becomes necessary to replace an assembly or part, refer to the spare
parts list for the part number and instructions for ordering a replacement.
Publication No. 68-01-03
July 1970
Requests for additional copies of this manual should be sent to the attention of
Technical Publications, MEMOREX Equipment Group, San Tomas at Central
Expressway, Santa Clara, California 95052
CONTENTS
Section
1.0
INTRODUCTION
1-1
1.1
General
1-1
1.2
Storage Media
1-3
1.3
Basic Drive Operations
1-3
1. 3.1
1. 3. 2
1. 3. 3
Seek
Write Operation
Read Operation
1-6
1-6
2.0
MACHINE DESCRIPTION
2-1
2.1
Machine Parameters
2-1
2.2
Machine Assemblies and Parts
2-1
2.3
Functional Areas
2-10
2.3.1
2.3.2
2.3.3
2.3.4
2.3.5
2-10
2-13
2-33
2-36
2-56
1-3
Cabinet and Cooling System
1/0 Interface
Operator Control Panel
Positioning and Spindle Drive Mechanisms
Logic Standards and Symbols
3.0
THEORY OF OPERATION
3-1
4.0
ADJUSTMENT PROCEDURES
4-1
4.1
Servo Adjustments
4-1
4.1.1
4.1.2
4.1. 3
4.1. 4
4.1. 5
4-1
4-1
4-1
4-1
4-2
4.2
General
Machine Preparation
Oscilloscope Preparation
Preliminary Servo Calibration
Final Servo Calibration
Voltage Adjustments
4-6
4.2.1
4.2.2
4.2.3
4-6
4-6
4-6
Minus 18 vdc
Plus 18 vdc
Plus 5 vdc - Over voltage Sense
ii
CONTENTS (continued)
Section
4.3
4.4
4.5
4.6
Page
Off- Line Head Replacement and Alignment
4-7
4.3.1
4.3.2
4.3.3
4.3.4
4-7
4-7
4-10
4-14
Equipment
Head-Arm Assembly Replacement
Head Alignment Check
Head Alignment
Index Transducer Block Alignment
4-17
4.4.1
4.4.2
4.4.3
4-17
4-18
4-19
Transducer Output Amplitude
Index Transducer Block Alignment Check
Index Transducer Block Adjustment
Cylinder Transducer
4-20
4.5.1
4.5.2
4.5.3
4.5.4
4.5.5
4.5.6
4.5.7
4.5.8
4.5.9
4-20
4-21
4-21
4-21
4-24
4-25
4-26
4-26
4-27
Transducer Installation
Prepare Oscilloscope
Drive Preparation
Preliminary Adjustment
Final Transducer Alignment
Amplitude Adjustment
Unusual Conditions
General Transducer Characteristics
Returning the Drive to Service
Spindle Drive Motor Replacement
4-28
4.6.1
4.6.2
4-28
4-28
Motor Plate Assembly Removal
Motor Plate Assembly Installation
4.7
Spindle Drive Belt Replacement
4-31
4.8
Spindle Assembly Replacement
4-32
4.9
Torsion Rod Replacement
4-34
4.10
Door StabiH ty Adjustment
4-36
4.11
Linkage Lever - Index Paddle Adjustment
4-37
4.12
Detent Pawl Replacement
4-38
4.12.1
4.12.2
4-38
4-38
Detent Assembly Removal
Detent Assembly Installation
4.13
Carriage Replacement
4-40
4.14
Preventi ve Maintenance
4-41
LOGIC DESCRIPTIONS AND DIAGRAMS
SCHEMATICS
WIRE TABULATIONS
iii
ILLUSTRATIONS
Figure
Title
Page
1-1
System Configuration
1-2
1-2
Memorex Mark I Disc Pack
1-4
2-1
Summary of Basic Machine Parameters
2-3
2-2
Machine Assemblies and Parts (4 sheets)
2-6
2-3
Cabinet Dimensions
2-11
2-4
Logic File and DC Power Supply
2-12
2-5
Air Flow Diagram (3 sheets)
2-14
2-6
Two-Level Interface Concept
2-13
2-7
Model 630 Communications Lines
2-19
2-8
Operator Control Panel
2-34
2-9
Linear Positioning Motor
2-37
2-10
Head Mounting Concept
2-38
2-11
Read/Write and Erase Poles
2-39
2-12
Double Detent Pawl and Cylinder Transducer
2-42
2-13
Spring Loaded Detent Pawls and Detent Actuator
2-14
Cylinder Transducer Primary and Secondary Pairs
2-45
2-15
Cylinder Transducer Circuit Schematic
2-46
2-16
Cylinder Transducer Output When Counting
2-47
2-17
Heads Retracted/Extended Switch
2-48
2-18
Index Transducer
2-4,9
2-19
Coil and Slot Relationship
2-50
2-20
Index/Sector Disc
2-51
2-21
Index Detection Output
2-51
2-22
Up-Speed Detection
2-52
2-23
Spindle Drive System
2-54
2-24
Simple Belt Drive
2-55
2-25
Mechanical Spindle Lock
2-55
2-26
Pack-On Switch
2-55
iv
·2-43
ILLUSTRA TIONS (continued)
Title
Figure
2-27
Miscellaneous Logic Rules
2-69
3-1
Power Up, Power Sequencing
3-2
3-2
First Seek
3-3
3-3
Programmed Seek (3 sheets)
3-4
3-4
Restore Retract
3-7
3-5
Write Operation
3-8
3-6
Read Operation
3-9
3-7
Normal Stop
3-10
3-8
Controlled Power Down
3-11
3-9
Abnormal Stop
3-12
3-10
Power Sequence
3-13
3-11
Seek
3-14
3-12
Restore/Recalibrate
3-15
4-1
Alternate One Track Seek (Forward Trace)
4-3
4-2
Alternate One Track Seeks (Reverse Trace)
4-3
4-3
200 Track Seek (Reverse)
4-4
4-4
200 Track Seek (Forward)
4-5
4-5
Head-Arm Mounting Clips and Alignment Slots
4-8
4-6
Handling the Head-Arm Assembly
4-9
4-7
Head Alignment Read Signal at One Revolution
4-13
4-8
Index Transducer
4-17
4-9
Index Transducer Alignment Output
4-19
4-10
Cylinder Transducer
4-20
4-11
Servo Amplifier Terminal Board
4-22
4-12
Rack and Pwals at Cylinder 000
4-23
4-13
Rack and Cylinder Transducer at Cy:linder 202
4-23
4-14
Reference Points for Final Transducer Alignment
4-24
4-15
Cylinder Transducer Output
4-27
4-16
Dri ve Motor and Mount Assembly
4-29
4-17
Brake Pawl-to-Spindle Pulley Clearance
4-33
4-18
Pack On Switch to Spindle Clearance
4-33
v
SECTION 1. 0
INTRODUCTION
1.1
GENERAL
Peripheral Systems Corporation's Model 630 Series Disc Drive is a direct
access disc pack storage unit. It reads and writes information on Memorex Mark I,
IBM 1316 or equivalent disc packs.
These disc packs serve as permanent or temporary information storage media
which can be written on by one drive, removed and stored, and then installed on
another drive with no loss of compatibility.
To record (write) and recover (read) information, a disc pack is installed on
a Model 630 disc pack drive.
The drive is responsible for performing the three basic
operations: seek, read and write.
To do this it must rotate the disc pack at the
required speed (2400 rpm ~ 2%), select one of 10 read/write heads for an operation
and position it to the prescribed track on the disc surface (all 10 heads position to
the same cylinder simultaneously, but only one head is selected to read or write at
a time).
The drive allows the controller to synchrOnize read/write operations by
referencing to an index on the disc pack.
Model 630 drives receive commands and data from the central proceSSing unit
through a controller.
Up to eight drives can communicate with the same controller.
Figure 1-1 is a simple block diagram showing the sysi:em configuration when more
than one drive is connected to a single controller.
AC power is supplied externally and, in the typical installation, also comes
from the controller (as shown in Figure 1-1).
There are two configurations of the
Model 630 drive (A and B) to accommodate either 60- or 50-Hz power supplies.
Details of ac power requirements are given in Section 2.3.2.
Standard Model 630 drives are completely compatible with the IBM 2841 controller.
These drives employ the second level of a two-level interface concept which
has been incorporated into the Model 630 interface design.
All cables and connectors
necessary to communicate with an IBM 2841 are available in second-level drives.
1-1
---
A
A
-
To
Central
Processor
-
Control
Unit
--
A
t
-- -
B
C
630
--
B
Drive
..-
-
I
630
..- B .-
Drive
Drive
C_
-
630
C_
-
-- up to eight
in normal
application
A - DC, data and select lines
B - SIGNAL lines
C - AC and sequence lines
System Configuration
Figure 1-1
However, Model 630 drives include self-contained dc power supplies and do not depend
on the controller for dc power.
*
For this reason, certain pins are not used.
These
pins and the dc power supply are described in more detail in Sections 2.3.2 and 2.3.5.
First-level interfaces are custom designed to meet the special requirements
of non-2841 controllers. Standard voltage levels on first-level interface connectors
are +5 volts for logical one and 0 volts for logical zero.
Exceptions to this are
identified in the appropriate pin connection lists in Section 2.3.2.
*
Except for special terminator power which is supplied by the dc line from the
controller.
1-2
1. 2
STORAGE MEDIA
Memorex Mark I, IBM 1316 or equivalent disc packs serve as the storage
media for the Model 630.
Figure 1-2 shows the recording discs, slotted index/
sector disc on the bottom of the pack and top and bottom protective pack covers.
Each pack consists of six aluminum discs coated with a magnetic oxide and
mounted one-half inch apart on a common hub. Information is recorded on the 10
inner disc surfaces in the form of polarized magnetic particles called bits. The
bits are recorded on 203 concentric circles (track 000 to track 202) on each disc
surface. Corresponding tracks on all 10 surfaces are considered information cylinders; there are 203 cylinders per pack. Cylinders 200, 201 and 202 are ordinarily reserved as spares under the control of initialization routines.
A Memorex Mark I or IBM 1316 disc pack is installed on a Model 630 by
raising the cabinet cover and lowering the disc pack onto the spindle. The discs
are secured to the spindle with 206
~ 32
lb of force by twisting the disc pack handle
clockwise. Once the discs are secured, the disc pack cover can be removed, the
cabinet cover closed and the machine started by depressing the START switch on
the operator control panel. Interlocks prevent the drive motor from stanlDL; until
the pack cover has been removed and the cabinet cover closed.
1. 3
BASIC DRIVE OPERATIONS
1. 3. 1 Seek
1. 3. 1. 1
First Seek (to cylinder 000)
When the START switch on the operator control panel is depressed (assuming
that the drive is connected to a controller and that its main power switch is closed),
power is supplied to the spindle drive motor and the disc pack begins rotating.
Once the discs reach 70% of the rated speed, the 10 read/write heads are positioned
to cylinder 000 (home position) in a first seek sequence. This begins with a forced
forward seek which is not completed as in a normal seek.
Instead, the carriage
moves all the way out to the forward stop and waits there while the simulated seek
command continues for 800 ms. When the delay times out, a reverse seek of 204
cylinders is initiated which detents the carriage at cylinder 000.
1-3
At 2.5 ms after
Memorex Mark I Disc Pack
Figure 1-2
1-4
the detent engages, the drive signals the controller that it is ready for further
instructions, Ordinarily, this would mean a seek command to some cylinder where
one head would be selected to read or write information.
1. 3. 1. 2
Seeks Other Than First Seek
. The controller initiates a seek by sending the address of the cylinder scheduled
for the next seek to the drive where that address is compared with the address of
the cylinder at which the heads are presently positioned. The computed difference
between the two addresses represents the number of cylinders the heads must travel.
Comparison logic also determines which direction the heads must move .. Once the
cylinder scheduled for the next seek has been selected, the controller selects one
of the 10 heads by diode switching.
Meanwhile, the difference count is converted by the drive into an analog voltage which powers the linear positioning motor. Before the difference count voltage
.,
reaches the linear positioning motor, however, it is compared with a speed sense
voltage supplied by a tachometer located in the positioning motor. This comparison
is made by a servo amplifier to control the voltage supplied to the poSitioning motor
so that the access speed of the heads is controlled.
The detent is then pulled, a 300";ms delay is started, and the linear positioning
motor moves the heads to the new cylinder. The purpose of the delay is to provide
a time check on the positioning system. If the carriage does not reach the new cylinder and detent within the 300 ms, a seek incomplete signal is sent to the controller. See Sections 2.3.5 and 3.0 for details.
During a normal seek, access control circuitry monitors the position of the
heads constantly by a cylinder transducer which sends a pulse to the present address
register each time a new cylinder is reached by the heads. Each pulse increases or
decreases (depending on direction of travel) the present address by one which causes
the difference count to decrease. When the difference count reaches zero, the
detent engages and the heads stop at the prescribed cylinder.
After a 2-1/2-ms damping delay times out, the drive signals the controller that
it is ready for a read or write operation.
1-5
1. 3.2
Write Operation
Writing is performed by a magnetic recording head :whichflies· close toih~
surface of the disc while the disc rotates rapidly under it.
The controller sends data to the drive using the double-frequency nonreturnto-zero te.chnique. Clock pulses supplied by the controller synchronize recording
of the data pulses. Every >800 ns (called a bit cell time) a clock pulse is recorded.
If no other pulse is recorded between two clock pulses, that bit cell time represents
a logical zero. Two pulses recorded during a bit cell time (every 400 ns) represent
a logical one.
The pulses are recorded as magnetic flux reversals in a track
wide. An erase gap, which follows the write gap by
of the written track and narrows it to a width·of
o. 045 inch,
o. 005 inch.
o. 008-inch
erases the edges
This process, called
tunnel erasing, prevents track-to-track smearing;
The'data track will now remain on the disc surface until erased and can be •
read at any time.
1. 3. 3
Read Operation
The same head poles used to write the data track are used to read it. The
magnetic flux changes recorded on the disc surface cause current reversals in the
two center-tapped read coils. The current reversals are converted to an output
signal which is transmitted to the controller. The recorded clock pulses serve as
a built-:in clock for the transmitted data.
1-6:
SECTION 2.
°
MACHINE DESCRIPTION
This section is devoted to a description of the Model 630 disc pack drive from
three viewpoints.
2.1
A.
Machine parameters
B.
Machine assemblies and parts
C.
Functional areas
MACHINE PARAMETERS
TABLE 2-1
BASIC MACHINE PARAMETERS
Capacity
Maximum disc pack capacity, 8-bit bytes
7.25 million
Bits available to a single access
Over 288,000
Data Retrieval Times
Rotational time, ms
25 (2400 rpm ~ 2%)
Track-to-track position time, ms
20, maximum*
Average access time **, ms
50
Maximum access time, ms
80
Readback data cell time, ns
800, nominal
1060, maximum
550, minimum
Read data pulse width, ns
150, nominal
200, maximum
75, minimum
*
**
This figure does not include average latency time of 12.5 ms q.ue to rotation.
o
time to do all seeks
Average access tIme = numb er 0 f see k s POSSlobI e
.2-1
TABLE 2-1 (continued)
BASIC MACHINE PARAMETERS (continued)
Write Operation
Technique
Double-frequency,
nonreturn to zero
Density, track 000, bits/inch (zero's rate)
765 (nominal)
Density, track 202, bits/inch (zero's rate)
1114 (nominal)
Logical 1 (write pulse frequency regulated by
controller), MHz
2.5* '::0.3%
Logical 0 (clock pulse at beginning of bit cell
time only), MHz
1. 25
Data transfer rate, megabits/sec
1. 25 (nominal)
*
Read Operation
Double-frequency recording technique provides
self-clocking read data
Data is sent to controller as stream of binary bits
Disc Pack Characteristics
Number of recording discs
6
Number of recording surfaces
10
Tracks per surface
200 plus 3 spares
Recording discs' outside diameter, inches
14.030 +0.000 -0. n·)
Diameter of track 000, inches
13.012, nominal
Diameter of track 202, inches
8.928, nominal
Disc pack cover outside diameter, inches
14.55, maximum
Radial dimension of track 202 to reference, inches 4.464, nominal
Radial dimension of track 000 to reference, inches 6. 506, nominal
*
Disc pack weight, lb
10 (approximate)
Coating material
Magnetic oxide
See Figure 2-1
2-2
o
1
Controller Data-------------------Controller Clock------------------Write Data-----------------------1 - 1-
r---~
__
Write Current---------------------
t-.:I
I
Read Signal (at read coil)-----------
c..:>
400 ns
1 bit cell time
Read Signal to Controller-----------pl- - - f
(Note phase shift because
of peak detection)
Summary of Basic Machine Parameters
Figure 2-1
1
o
o
TABLE 2-1 (continued)
BASIC MACHINE PARAMETERS (continued)
Heads
Number of heads
10
Width of track as written, inches
0.008
Width of track when erased, inches
0.005
Track spacing center-to-center, inches
0.010
Operator Controls
ENABLE-DISABLE
READ/WRITE READ ONLY
START - STOP
Overall Dimensions
Width, inches
30
Depth, inches
24
Height, inche s
38
Weight, lb
295
Environment
T emperat ure range, of
*
60 to 90
Relative humidity range, %
8 to 80
Heat dissipation, BTU/hr
3500
Electrical Requirements (see Section 2.3.2)
*
Model A ac power, vac, Hz
208/230, 60
Model B ac power, vac, Hz
220/380, 50
Phase
Receive 3-phase,
use single-phase
DC power supply
Self-contained,
except for special
termination requirements
Maximum start current, amp
25
Maximum run current, amp
4.5
Temperature changes less than 15 0 per hour are acceptable.
2-4
2.2
MACHINE ASSEMBLIES AND PARTS
Figures 2-2A through 2-2D illustrate a Model 630 without covers. The circled
numbers call out assemblies and subassemblies which are cross referenced to the
following lists:
A.
1.
2.
3.
4.
5.
B.
6.
7.
8.
9.
10.
Interior control panel (connector side)
Spindle drive motor, pulley and motor mount
Running-time meter (or usage meter)
Pack-on switch
Cabinet blower
C.
11.
12.
13.
14.
15.
Interior control panel (access panel for maintenance)
Spindle pulley, belt and mechanical spindle lock
Logic card file (connector side)
Logic card file plenum (including pass-transistor regulator and
logic card file fan)
DC power supply
16.
17.
18.
19.
20.
Spindle (disc pack mounting surface)
Detent mechanism and cylinder transducer
Servo amplifier
Heads retracted/extended switch
Index transducer
D.
Operator control panel
Tachometer (in armature behind nylon cap)
Linear positioning motor (armature within permanent magnet)
Carriage, carriage way and head-arm assembly
Cam tower and read/write amplifier cards
2-5
A
Machine Assemblies and Parts
Figure 2-2 (sheet 1 of 4)
B
Machine Assemblies and Parts
Figure 2-2 (sheet 2 of 4)
l\.:)
I
00
C
Machine Assemblies and Parts
Figure 2-2 (sheet 3 of 4)
D
Machine Assemblies and Parts
Figure 2-2 (sheet 4 of 4)
2. 3
FUNCTIONAL AREAS
The various assemblies and parts identified in Section 2.2 can be classified
into five major functional areas of the Model 630.
A.
Cabinet and cooling system
B.
I/O interface
C.
Operator control panel
D.
Positioning and spindle drive mechanisms
E.
Control circuitry
The disc pack, which is not an integral part of the drive, was described in Section 1. 2.
2.3.1
Cabinet and Cooling System
2.3.1.1
Cabinet
The cabinet housing the unit is 30 inches wide, 24 inches deep and 38 inches
high.
Figure 2-3 is a diagram showing cabinet dimensions and floor space needed
for maintenance. A Model 630 weighs approximately 295 pounds.
Front and back coyers are attached to the mainframe by magnetic strips and
pull off for easy access to the cabinet's interior.
are also attached by magnetic strips.
The side panels and two top covers
The kick panel on the front of the cabinet and
the one on the back are each attached by two sheetmetal screws.
The logic card
file and dc power supply are housed in a door which swings out of the back of the
cabinet on two hinges (see Figure 2-4).
2.3.1.2
Cooling System
Two fans are used for cooling the cabinet. The main blower is located on the
floor of the cabinet just inside the front panel.
Driven by a 1/8-horsepower motor,
it pulls cool air into the cabinet through a filter at a rate of 200 cfm (static pressure at blower is 0.25 inches of water). The air is deflected by a piece of sheetmetal into two columns of air.
One column is forced through a duct up the side of
the cabinet and into the shroud area.
No air is forced into the disc pack itself.
Disc rotation generates its own air circulation.
From there, the air flows into the
positioning motor area, past the servo amplifier/heat sink and back down into the
2-10
!-------l~
I,
I
Rear
Clearance
Area
,•
•
I
I
Cable
EntranCE
Port
+
.-,
.....
l
I
I
~
I
36.00"
,
SCALE:
1"
~
= 20"
24. 00"
I.,
•
~
I
Clearance
36.00"
'I'Front
'~
~
L_____
Area
r- 30.00"-1
00
1-
G::::I
/
,f
A~
~.
....
I
•
0
:IIf
38.00"
I
I
,
Cabinet Dimensions
Figure 2-3
2-11
00015
Logic File and DC Power Supply
Figure 2-4
2-12
interior of the cabinet. This flow of air then leaves the cabinet through ports in
the back of the unit.
The other column moves into the box containing the interior control panel
and then out through a hood directly into the card file door.
A small fan assists
some of the air into the regulator section and down into the power supply area.
The rest of the air flows through slits in the card file, past the cards and out
holes in the back panel.
See Figure 2-5 for an air flow diagram.
2. 3. 2 I/O Interface
A two-level interface option has been incorporated in the Model 630.
Model
630 drives which are plug-compatible with IBM 2841 controllers employ the secondlevel interface.
Model 630 interfaces may also be designed to communicate with
non-2841 controllers.
These custom interfaces are at the first level.
The two
levels are illustrated in Figure 2-6.
BASIC DRIVE
(includes read/write
electronics power
supply, basic control
circuitry, drive deck
and cabinet)
First-
- Level Interface
ADAPTOR
INTERFACE
ON
LOGIC
CHASSIS
-
SecondLevel
Interface
Two-Level Interface Concept
Figure 2-6
2-13
-
CONTROLLER
Air Flow Diagram
Figure 2-5 (sheet 1 of 3)
2-14
M
S
4-<
H
N
C\i
0
bIl
....,
0
...c:
C\i
......
~
Q.)
Q.)
Ul
0
t.n
~
N
......
H
......
~
I
Q.)
H
51
......
~
2-15
Air Flow Diagram
Figure 2-5 (sheet :3 of ;>')
2-16
2.3.2.1 Power Requirements (AC apd DC)
AC power requirements are the same for drives using either interface level.
The following list defines these requirements for the two basic Model 630 configurations (Model 630 A and Mode1.630 B).
Current
{arnE}
Voltage
{vac}
Model
A
208/230 ~ 10%
B
220/380 ~ 10%
*
Frequency
~Hz~
25 (start); 4.5 (run)
60 + 1/2
25 (start); 4. 5 (run)
50 ~ 1/2
Both configurations receive power via six-wire cables. The sixth wire (neutral)
is not used except in areas where only 380-vac, 50-Hz Wye-connected power is
available. When neutral is used, a terminal board change is required so that power
is received from line-to-neutral (in a four-wire, 380 vac system, line-to-neutral
is 220 vac).
Neutral is normally not used in 60-Hz configurations.
AC power is supplied as three-phase, but the individual units draw current
from only one phase.
The phases are rotated (between in and out connectors) in a
multiunit system to provide a balanced load.
Either 208 or 230 vac is required but not both; a tap is available on the power
transformer to allow use of 208 vac instead of 230 vac.
DC power for the logic and control functions is provided by the unit itself. A
self-contained dc power supply is located in the card file door at the back of the
cabinet. The dc power supply and control and logic circuitry are discussed in
detail in Section 2.3.5.
*
Wire change in Model 630 required when 380 vac is used.
2-17
Cable lengths should conform to the following specifications (refer to
Figure 1-1).
Cable A -- Separate run for each drive
50 ft. (maximum)
Cable B -- Jumper connection from drive to drive
100 ft. (maximum
Cable C -- Jumper connection from drive to drive
100 ft. (maximum accumulated)
ac~mmulated)
To satisfy electrical requirements in most areas of the United States, a maximum ac power cable length of 14 ft. is recommended.
(UL and local codes must be
checked for each installation.)
2.3.2.2
Communication Lines
The communication lines illustrated in Figure 1-1 are identified in more detail
in Figure 2-7. These lines can be listed in two basic categories, input and output.
Input (to Model 630 from controller)
8 - Time-shared bus lines
4 - Tag lines
1 - Select unit line
1 - Write data coaxial line
1 - +36 vdc to controller (for first drive in chain sequence control)
1 - +36 vdc in
1 - Controlled ground
Output (from Model 630 to controller)
8 - Selected unit cylinder address lines
1 - Attention
1 - Unit selected
1 - Selected unit ready
1 - Selected unit on line
1 - Selected unit index pulse
1 - Selected file unsafe
1 - Selected unit seek incomplete
1 - Selected unit end of cylinder
1 - Read data coa:x:ial line
2-18
2.3.2.1 Power Requirements (AC apd DC)
AC power requirements are the same for drives using either interface level.
The following list defines these requirements for the two basic Model 630 configurations (Model 630 A and Model.630 B).
Voltage
{vac}
Model
A
208/230 ~ 10%
B
220/380 ~ 10%
*
Current
{am l2}
25 (start); 4.5 (run)
Frequency
25 (start); 4.5 (run)
50 ~ 1/2
(Hz~
60 + 1/2
Both configurations receive power via six-wire cables. The sixth wire (neutral)
is not used except in areas where only 3S0-vac, 50-Hz Wye-connected power is
available. When neutral is used, a terminal board change is required so that power
is received from line-to-neutral (in a four-wire, 380 vac system, line-to-neutral
is 220 vac).
Neutral is normally not used in 60-Hz configurations.
AC power is supplied as three-phase, but the individual units draw current
from only one phase. The phases are rotated (between in and out connectors) in a
multiunit system to provide a balanced load.
Either 208 or 230 vac is required but not both; a tap is available on the power
transformer to allow use of 208 vac instead of 230 vac.
DC power for the logic and control functions is provided by the unit itself. A
self-contained dc power supply is located in the card file door at the back of the
cabinet. The dc power supply and control and logic circuitry are discussed in
detail in Section 2. 3.5.
*
Wire change in Model 630 required when 380 vac is used.
2-17
Cable lengths should conform to the following specifications (refer to
Figure 1-1).
Cable A -- Separate run for each drive
50 ft. (maximum)
Cable B -- Jumper connection from drive to drive
100 ft. (maximum accumulated)
Cable C -- Jumper connection from drive to drive
100 ft. (maximum accumulated)
To satisfy electrical requirements in most areas of the United States, a maximum ac power cable length of 14 ft. is recommended.
(UL and local codes must be
checked for each installation. )
2.3.2.2
Communication Lines
The communication lines illustrated in Figure 1-1 are identified in more detail
in Figure 2-7. These lines can be listed in two basic categories, input and output.
Input (to Model 630 from controller)
8 - Time-shared bus lines
4 - Tag lines
1 - Select unit line
1 - Write data coaxial line
1 - +36 vdc to controller (for first drive in chain sequence control)
1 - +36 vdc in
1 - Controlled ground
Output (from Model 630 to controller)
8 - Selected unit cylinder address lines
1 - Attention
1 - Unit selected
1 - Selected unit ready
1 - Selected unit on line
1 - Selected unit index pulse
1 - Selected file unsafe
1 - Selected unit seek incomplete
1 - Selected unit end of cylinder
1 - Read data coaxial line
2-18
WRITE DATA ;OAX
.-
CONTROL LIN ES (3)
.-
UNIT BUS LIN ES (8)
~
~
SELECT
HEAD ADVANCE
/f---
I'.i
~
~
-
SELECT
RETURN TO 000
~
I---
v+---
HEAD SELECT
III----
SELECT ERASE
I
HEAD
ADDRESS
REGISTER
"-~
1
1
.-
I
t
L...-f
~
'--
Si
......
~I
~
;1
'":::ll
~I
81
r--
I'I-
1 \'..
1 r'-- II t....
I
1
1
I
CYLINDER AD JRESS (8)
i
L..--.
r-I
WRITE/READ
HEADS
I-- I -
I
1
I
I
I
I",
I~
SELECT
START SEEK
r-
I~
SELECT
SET CYLINDER
I~
18
I~
L...-.,...
I~
SELECT WRITE
I
I
I
1
SELECT
SET HEADS
SELECT
CONTROL
I
I
READ
PREAMPLIFIER
AND AMPLIFIER
SELECT
HEAD RESET
I-I--
r--
r1
~
SPEED
DECODE
CYLINDER
ADDRESS
REGISTER
I
}J
LINEAR
MOTOR
CONTROL
'"
INDEX / CYLINDER
TRANSDUCERS AND
SPEED DETECTION
)
0 0
0"
z'"
a:
f--
a:
f-
'"-'0.
:I;~
SELECTED U liT INDEX PULSE
.....'"
'"
z
'"
...
I-- ~ t:
'"'" z '"-'
en '"
~
Z
I~
...
0
I
I
I
I
I
I
I
I
z
'" ,I
0
0
1
ATTENTION
READ DATA
~
WRITE
AMPLIFIER
AND ERASE
CONTROL
SELECT READ
L--
ttl
t>:>
I
HEAD
SELECT
o THRU 9
SAFETY
CIRCUITS
~
1
~
I-I-I-- fI-- f-
~
r---.:.....
1
1
1
1
1
"
I
OAX
STATUS LINE 5(5)
Model 630 Communication Lines
Figure 2-7
1 - Selected unit read only
1 - Selected unit write current sense
1 - Heads extended line (common to all drives)
1 - Sequencing voltage out
INPUT LINES
A.
Write Data Coaxial
Information is received from the controller on this line in binary form.
A-L
level signal (nominal 0 vdc) represents a bit and +L level signal (nominal +3
vdc) represents absence of a bit. A bit is sent at the beginning of each 800 ns
bit cell time for a "zero" and a bit is sent at the beginning of each 800 ns bit
cell time plus a data bit in the center of the cell time (400 ns interval) for
"ones".
B.
Pulse width is 100 :±: 25 ns with fall time less than 30 ns.
Select Unit
A separate line exists for each unit in a multidrive system via dc cables. This
line must remain at -Q (nominal -3 vdc) during read, write and control operations. When the 630 drive is not selected, this line is at +Q (nominal +3 vdc).
C.
Tag Lines
There are four lines used to perform setup and control functions by acting as
strobe pulses (pulse duration 800 ns) for the time-shared bus lines. They are:'
1.
Control
When this line is pulsed (assuming select unit and file safe conditions)
with a -Q level, the 630 looks at the bus line selected by the control tag
line and performs the indicated control function.
2.
Set Cylinder
When this line is pulsed (assuming select unit and file safe conditions)
with a -Q level, the 630 looks at all eight bus lines for the new cylinder
address and sets the CAR (cylinder address register) with the new address.
2-20
3.
Set Head and Direction
*
When this line is pulsed with a -Q level, the 630 looks at unit bus lines
4, 5, 6 and 7 and sets the head address register with the new head address.
The head address register requires a "reset head register" control command prior to "set head" commands.
4.
Set Difference
This line is not used in the Model 630 drive. It is used by the IBM 2311
to set the difference count into difference counter. The 630 calculates
this difference itself, using one's complement arithmetic and does not
depend on the controller for a difference count.
D.
Controlled Ground
This line provides ground input to the K1 sequence relay.
The controller nor-
mally uses the line to power up and down a string of 630 drives.
E.
+ 36 vdc Sequencing Voltage In
This line receives +36 vdc from the previous drive or controller to pick
sequence control relay Kl.
F.
Unit Bus Lines (Eight)
These time-shared lines are used under control of the tag lines to perform control functions in the 630 drive.
These functions are listed below (Table 2-11).
The lines are pulsed (- Q leVel).
G.
CPU Halt
This line brings in a signal generated by the central processing unit which
notifies the controller when the CPU is in a wait state (e. g., a programmed
halt instruction). The active signal is at the -Q level and is used only in
conjunction with the revenue meter option on the 630 drive.
*
When a Model 630 communicates with an IBM 2841, it receives a direction of
travel bit on the 0 bus line.
This bit is ignored because direction is derived
as part of the difference count operation performed by the 630.
2-21
Table 2-II
UNIT BUS LINE FUNCTIONS
Function During Various Cycles
Line N{me
t-:l
I
1.
Control Cycle
IT. Set CoY linder
ITI. Set Head and Direction IV. Set Difference
*
Bus 0
Set Write
Cylinder 128
Bus 1
Set Read
Cylinder 64
64
Bus 2
Seek Start (0.8 usStS2 us)
Cylinder 32
32
Bus 3
Reset head register
Cylinder 16
16
Bus 4
Set erase
Cylinder 8
Head 8
8
Bus 5
Select head
Cylinder 4
Head 4
4
Bus 6
Restore (15 msS t <50 ms)
Cylinder 2
Head 2
2
Bus 7
Set head advance (0.8 us:)
I
c,.,
I:>:)
The voltage levels identified by the letters Q, Land W in the right-hand column are defined as follows:
-Q = -0.5 to -3.5 volts
-W
=
=
+W
= +38.9
-L
=
+L
= +6.28
+Q
+3.5 to +0.65 volts
+1. 3 to 0 volts
to +28.4 volts (+36 volts, nominal)
+0.3 to 0 volts
to +2.0 volts (+3 volts, nominal)
2.3.3
Operator Control Panel
Figure 2-8 shows how the keys and lights are displayed on the operator
controi panel. The functions of operator control switches and indicators are as
follows:
A.
ENABLE-DISABLE Switch
ENABLE Position - The switch enables the logical connection between the
controller and the Model 630 drive.
DISABLE Position - The switch disables the logical connection between the
controller and the Model 630 drive.
If the Model 630 drive is performing an operation under the command of the
controller, changing the state of the switch will give an off-line indication to
the controller.
B.
READ/WRITE - READ ONLY Switch
READ/WRITE Position - The switch enables read and write circuitry.
READ ONLY Position - The switch disables the write and erase circuitry to
allow a READ ONLY operation. A line is available in the I/O interface to
indicate that the READ ONLY mode has been selected. The controller designer must incorporate this signal in system status if the ceutral processor
is to recognize the condition (a standard IBM 2841 does not recognize this
condition) .
C.
UNIT NUMBER/READY Indicator (Green)
The number legend associated with this indicator can be cha,nged easily to
reflect the logical unit number of the drive in the system. This indicator
lights up when the drive has reached operational speed and the heads are
positioned to track 000 on the initial load operation. This green light signifies that the drive is ready for instructions. The indicator goes off when the
STOP switch is depressed or when system -power is dropped. The indicator
also goes off if the detent remains unseated for 300 ms or longer.
D.
File Monitor Indicators
This indicator cluster calls out the cylinder position (weighted, binary number
readout) and indicates a FILE UNSAFE condition (red light) and READ ONLY
mode (white light).
The access position indicator continuously identifies the cylinder to which the
heads have been positioned.
The FILE UNSAFE indicator lights when the safety circuits determine that
the file is unusable.
2-33
ENABLE
t\?
I
C.i:I
oj::..
~IM
DIEI 7J
12864 32 16 8 4 2 1
FILE UNSAFE
READ ONL ~
[MEM;REX-
START
&I
STOP
630]
Operator Control Panel
Figure 2-8
The READ ONLY indicator lights when the write and erase circuits are disabled by the READ ONLY switch.
E.
START-STOP Switch
START Position - This switch is operable when the main power switch to the
unit is on, a pack has been loaded and the cover closed. Depressing this
switch powers the drive motor and, when the disc pack speed is greater than
1700 rpm, and pack stabilization delay of 45 seconds has expired, loads the
heads and positions them to cylinder 000.
STOP Position - With the switch in this position, power to the motor cuts off
and the carriage is retracted, w:hich unloads the heads. Dynamic braking
stops the spindle within 10 seconds.
2-35
2.3.4
Positioning and Spindle Drive Mechanisms
2.3.4.1
Positioning Motor
The linear positioning motor consists of a stationary permanent magnet surrounding a moveable, bobbin-wound armature. The armature is free to slide in and
out of the permanent magnet through a hole in one of the magnet's faceplates.
See
Figure 2-9.
Fastened to the armature by three screws is a T-bar tower which holds the
10 head-arm assemblies. The T-bar is mounted on a carriage that moves freely
along a carriage way on three pair of opposed ball bearing rollers.
Move-
ment of the armature in and out of the permanent magnet moves the carriage forward
and back. This linear travel positions the heads over or under their respective
disc surfaces or pulls them out and away from the disc pack.
Power for this movement is provided by a direct current which is fed to the
armature over a current range of 0 to 6 amp. The magnetic field built up around
the armature by this current reacts with the permanent magnetic field. The reaction either forces the armature out away from the permanent magnet or pulls it into
the field. Direction depends on the polarity of current; speed depends on the current
level. Refer to Section 2.3.5 for a description of the source and control of this
power. Two beryllium strips serve as flexible connectors between the armature
coil and the dc power supply leads.
2.3.4.2
Head-Arm Assembly
The head-arm assembly consists of 10 read/write heads attached to the ends
of 10 support arms.
These arms are mounted on a moveable T-bar carriage in two
banks of five each; half of the head-arm assemblies face up and half face down.
See Figure 2-10.
The read/write heads contain the read/write and erase poles. As can be seen
in Figure 2-11, the read/write gap precedes the erase gap by 0.045 inch. The coils
2-36
A
B
Linear Positioning Motor
Figure 2-9
2-37
CARRIAGE
CAM TOWER
HEAD ARM
ASSEMBLIES
I\:)
I
c.o
(Xl
CAMS ARE REPRESENTED BY
THREE SOLID RECTANGLES;
HEADS ARE SHOWN LOADED
AND RIDING FREE OF CAMS
Head Mounting Concept
Figure 2-10
~
:s:
I
C.:I
~
~
.
rv~'l
~rv.
TUNNEL ERASE
GAP
Read/Write and Erase Poles
Figure 2-11
•i
READ/WRtTE
GAP
ROTAn€::]
which carry the read/write and erase currents are also illustrated in Figure 2- 11.
Two coils are connected in series (center tapped) on the read/write pole and a
single coil is used on the erase pole. Head selection (using diode switching) places
ground on the center tap of the selected head as shown in the sketch below.
FROM WRITE
DRIVER
OR
TO READ
AMPLIFIER
t
t
ERASE COIL
ERASE
READ/WRITE COILS L---4,..,.V"n.._--1~2SE:2ELECT
HEAD SELECTED
(OV - SELECTED
+36V - UNSE LECTED)
Each head shoe is gimbal-mounted to allow pivoting on any horizontal axis.
Vertical mobility is provided by a leaf spring built into the arm. This freedom of
movement allows the head to maintain the correct altitude over the disc surface.
The leads connected to the read/write and erase coils are encased in a stainless steel spring.
This spring supports and shields the leads and acts as a ground
connection between the head arm and read/write circuitry.
2-40
The leaf spring is designed to maintain a constant loading force on the heads
(350 grams, nominal). When the heads are in the retracted position, Delrin
* un-
load pins bear against a ramp surface (also an integral part of the head arm). They
counter the loading force and hold the heads in the unload position. The purpose of
the pins is to keep the heads separated enough to clear the discs during load and
unload operations. The pins are attached to an aluminum tower which arches over
the arms.
The load/unload ramp rides off its pin as the head moves into the pack. When
the ramp is clear of the pin, spring tension from the leaf spring forces the head
toward the disc surface. An air bearing between the head and disc surface created
by the rotating disc counters the spring loading force and keeps the head at the
required flying height (125 microinches, nominal).
As the arm is retracted, the ramp rides back onto its pin and the head is
lifted clear of the disc surface. Just as loading the heads is an inseparable part of
initial seek, unloading is integrated with the retract operation.
2.3.4.3
Detent Mechanism
A rack of teeth, called the detent rack, is mounted on the carriage directly
under the array of arms. As the carriage moves along the track during positioning,
the rack moves with it. Spacing of the rack teeth is 0.020 inch.
A double detent pawl is mounted on the carriage way opposite the rack. Each
pawl has a set of four teeth with the same pitch as the rack teeth. The two pawls
are offset from one another by half their pitch (0.010 inch). See Figure 2-12.
This
offset spacing allows the pawl to engage the rack in twice as many positions as there
are teeth. When one pawl is engaged, the other rests on top of the adjacent rack
tooth. This is commonly referred to as odd/even detenting. One detent pawl engages
at all odd cylinder positions while the other engages at all even cylinder poSitions.
The two pawls are spring loaded and held in the detent-out position by a
detent actuator. See Figure 2-13.
*
du Pont trade name for an acetyl resin
2-41
UPPEn
DETENT
SPRING
LOWER
DETENT
SPR I NG
(021-660)
Double Detent Pawl and CYlinder Transducer
Figure 2-12
2-42
DOUBLE SENSOR
CYLINDER
TRANSDUCER
Spring Loaded Detent Pawls and Detent Actuator
Figure 2-13
2-43
2.3.4.4
Motion and Position Detectors
There are two basic movements in the Model 630 which must be monitored:
(1) the linear travel of the carriage along its way and
(2) the rotary motion of the
disc pack on its spindle.
As the heads are positioned from one cylinder to another within the disc pack,
it is necessary to keep an accurate count of the number of cylinders passed. This
is accomplished by a variable reluctance transducer mounted on the carriage way
at one end of the detent pawls facing the detent rack. See Figures 2-12 and 2-13.
This cylinder transducer contains two sets of paired primary and secondary
coils. See Figure 2-14. The two sets are separated from one another so that while
one is opposite a rack tooth, the other is opposite a valley. The primaries are
wired in series and excited at 145 kc at about 5 volts. Each time a rack tooth passes
a primary-secondary pair, it couples them. The coupling indicates to an up-down
counter in the logic that another cylinder has been reached by the read/write heads.
The peak-to-valley spacing allows each rack tooth to be counted twice to give a
0.010-inch cylinder spacing indication.
Figure 2-15 is a schematic of the cylinder
transducer circuit and Figure 2-16 shows the sequence of pulse shapes as seen on
a scope when rack teeth pass the cylinder transducer.
Home position (cylinder 000) is detected using the forward carriage stop as
a starting point. Whenever the heads must be positioned to home from a location
without a known address, they are first sent to the forward stop, which is assigned
an address of 204. A reverse seek of 204 cylinders is initiated; when zero difference
count (compare) condition is reached, the carriage is detented. This is home
position.
Certain safety circuits need to know whether the heads are extended or retracted. A double microswitch mounted on the carriage way near the positioning
motor is switched off when the heads are retracted and on when they are extended.
See Figure 2-17.
2-44
PRIMARY
CONNECT
_-..0.- SERIES
~
SECONDARY
SERIES OPPOSING
j
I:;:>"j
.
I I ~
~
I
~
c:n
Cylinder Transducer
Primary and Secondary Pairs
Figure 2-14
[3
+18YOCI
C
@TPj
TP2@
,
1
RII,200
VVV'--,......
If?W
C4
.IUF
25v
R3
8
I I
13
R4
T
RI
E
TRANSOUCER{
10K
SECONDARY
IF
I
, III
StS"2
.. -...
1 __ .
~9
~C2
300PF
I
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TP31
IOOOY
I
i=1i3A
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•
IB
1+ UPPER
I 0 1+ ENABLE
l\!)
1
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OSCILLATOR
21~-~
0)
>9
TRANSDUCER
PRi MARY
-18yocl
A
3
I-I-~
R14.620
V\IV'.
•
+1 CI
GRO
GRO
1
C3
300PF
,OOOY
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+SVOC
~
•
•
4.7UF
10Y- __
Cy linder Transducer
Circuit Schematic
Figure 2-15
S3BY
14
1+ LOWER
COMPARATOR OUTPUTS
Sensor
B
Sensor
A
U
U
1
2
3
4
5
6
7
8
9
I
I
I
I
I
I
I
I,
1.
Sensor A is fully coupled by a tooth; sensor B is opposite a valley.
2.
Tooth moving away from A; another tooth approaching B; trigger point.
3.
Equal coupling of both sensors; null point.
4.
Coupling of A approaching minimum; coupling of B approaching maximum;
trigger point.
5.
Sensor A opposite a valley; sensor B fully coupled by a tooth.
6.
Tooth approaching sensor A; tooth mOving away from B; trigger point.
7.
Equal coupling of both sensors; null point.
8.
Tooth approaching sensor A; tooth moving away from B; trigger point.
9.
Sensor A fully coupled by a tooth; sensor B is opposite a valley.
Cy linder Transducer Output When Counting
Figure 2-16
2-47
(024-660)
Heads Retracted/Extended Switch
Figure 2-17
2-48
Rotational speed of the disc pack and location of index are monitored by the
index transducer (Figure 2-18), which is mounted facing the spindle.
When a disc
pack is installed, the edge of the slotted disc on the bottom of the pack separates
a permanent magnet from a single coil (Figure 2-19).
slots pass between the magnet and coil.
As the pack rotates, the
Since the dis'c is aluminum, there is
minimum coupling when the air gap between the magnet and coil is blocked by the
disc and maximum coupling when the slots appear
The edge of the disc contains 20 evenly spaced single slots (sector slots).
Close to one of the sector slots is another slot which marks index for the disc
pack.
See Figure 2-20.
As the disc pack rotates and each sector slot is detected,
a pulse from the index transducer comparator sets a flip-flop in the index/sector
logic.
The flip-flop resets itself following a delay.
The relationship between the
length of the delay and the sector slot spacing is such that the delay times out
before the next sector slot reaches an AND gate in the index/sector logic.
Out-
put of the reset flip-flop ANDs with the sector slot pulse to generate a sector
signal.
The pulse generated by the index pulse reaches another AND gate before
the flip-flop can time out so that the output of the set flip-flop ANDS with the index
slot pulse to generate an index signal.
The sector signals and index signals are
used by the controller to synchronize read/write operations.
trates coupling output during index detection.
Index Transducer
Figure 2-18
2-49
Figure 2-21 illus-
The logic that determines whether or not the disc pack has reached minimum operating speed relies on two delays. Each delay is initiated by the arrival
of alternate index pulses. As the disc pack accelerates from rest, the interval
between the arrival of index pulses at the logic decreases until one of the delays
does not have time to time out. This causes a flip-flop to set.
The next index
pulse arrives before the other delay times out, causing its flip-flop to set. The
output of the two set flip-flops is ANDed to' produce a signal which indicates that
the disc pack has reached minimum operating speed. Figure 2-22 illustrates the
timing relationships in the up speed detection logic.
Refer to the logic description
for logic diagram 200616 for a more detailed explanation of the timing diagram.
PERMANENT
MAGNET
SECONDARY COIL
~""."
Coil and Slot Relationship
Figure 2-19
2-50
Index/Sector Disc
Figure 2-20
Index/Sector Disc
Figure 2-20
A
A
A - Sector pulses
A and B - Index
Index Detection Output
Figure 2-21
2-51
B
n
INDEX
n
n
n
L
Ir'------------.--------U
U
3B
II
-
- - - JI _ _~~ ~35ms-l
---
5BQ
IB .
D/RD
I
I
II
I......-----U
u
3C
===__-+_________
-- I
U
I
u
u
I
I
I
u
I
I
I
SPEED
I
+ UP SPEED
Up-Speed Detection
Figure 2-22
I
I
.-
I
IBQ
-up
Ir
I
IAQ
t>:I
n rt..
n
U
D/RD
'"
n
~35ms~
IA
t>:I
I
n
I
____~-I
5BQ
n
UP SPEED
U
2.3.4.5
Spindle Drive System
Rotation of the disc packs is provided by the spindle drive system which includes the disc pack drive motor, spindle and drive belt. See Figure 2-23_
The disc pack drive system is powered by a one-half horsepower, 60- or 50Hz, single-phase ac motor.
As shown in Figure 2-24, the motor transfers torque
to the spindle drive pulley by a simple belt loop. Tension on the belt is maintained
by a special motor shock mounting; no idler pulley is used.
The drive motor also serves as a dynamic brake for the disc pack drive.
When the STOP switch is depressed, ac power to the motor is cut off and dc power
(36 volts) is applied to the motor coil for about 10 seconds.
AC power is also cut
off when the cabinet cover is lifted.
The disc pack spindle is bolted into a hole in the baseplate with the spindle
pulley below the baseplate and its disc pack mounting surface above.
A speed
ratio between the motor pulley and the spindle pulley reduces spindle rotation to
a maximum of 2400.::: 48 rpm.
A disc pack is secured to the spindle cone with 206 .:: 32 pounds of force by
a locking shaft within the spindle and Belleville washers below the spindle pulley.
The spindle assembly includes a mechanical lock which engages when the top
cover is raised to load or unload a disc pack. See Figure 2-25.
When the cabinet
cover is lifted, a nylon arm on the cover tilts the index transducer back.
This
movement causes a pawl under the baseplate to engage one of several notches in
the spindle pulley.
from turning.
As long as the cover is raised, the pawl will prevent the spindle
This lock can be bypassed by removing the cover from the machine.
The assembly also includes a pack-on switch which automatically closes
when a disc pack is installed (see Figure 2-26). The pack--on switch is a safety
feature and must be closed for the drive motor to operate.
2-53
Spindle Drive System
Figure 2-23
2-54
/
~-. MOTOR
~
I
\
(
)
\
'"
""--
/
DRIVE BELT
-------Simple Belt Drive
Figure 2-24
Mechanical Spindle Lock
Figure 2-25
Pack-On Switch
Figure 2-26
2-55
2.3.5 Logic Standards and Symbols
Output of the AND function, as it is used in Model 630 logic, is "active" when
all its inputs are "active" . Any "nonactive" AND inputs will cause a "nonactive"
output. Output of the OR function is "active" when anyone or more input(s) are.
"active".
All "nonactive" OR inputs will cause a "nonactive" output.
Note that the above activity definitions do not refer to
logic~l
one. logical
zero or electrical reference states.
The level required (high or low) for the active state of an input or output of
any particular logic element is indicated by an active state symbol attached to the
logic element symbol.
A small circle at the input(s) indicates that a relatively low input signal activates the function. Conversely, the absence of a small circle indicates that a relatively high input signal activates the function. A small circle at the output indicates
that the output of the activated function is relatively low. Absence of a small circle
at the output indicates that the output of the activated function is relatively high.
The presence of an indicated active output does not necessarily provide a
useful input to other elements. It may prevent the operation of some and enable
others.
Conversely, the absence of the indicated output signal state may pro-
vide a useful input to elements in the logical net and prevent the operation of
others.
2-56
Voltage levels for the two states are:
High
Logical 1
+5v
Low
Logical 0
Ov (ground)
The following logic symbols and definitions outline the rules governing symbology for the Model 630 logic diagrams.
AND Function (NAND Gate)
Output is low only if all inputs are high.
In
OR Function (NOR Gate)
In
Output is high if any input is low.
In
AND Function (with Expander Input)
In
Out
In
The expander input does not alter the
function of the gate. Its purpose is to
provide a greater number of inputs.
OR Function (with Expander Input)
In
In
Out
In
2-57
In
Collector OR * (DOT OR)
In
...-tC>--
Out The output is active (low) if either
or both inputs are low.
In
In
Collector AND* (DOT AND)
In
Out
.......- -
The output is active (high) only if
both inputs are high.
In
-_ .... _-..,
FLIP-FLOP (Latch)
Set in
Set in
)ooop"--
Set Out
I
I
If any SET input is low and all RESET
I
I
I
Clear in
Clear in
~""""""\.
This device stores a sirtglebit. It has
two sets of inputs: SET and RESET. It
has two possible outputs: SET and RESET.
inputs are high, SET out will be high.
If any RESET input is low and all SET
)-&~I_Clear
I
I
inputs are high, RESET out will be high.
Out
If all inputs are high (SET and RESET),
the latch will maintain its last state.
--- _....J
* Collector gates are tie pOints. The symbols represent a meeting of two logic
outputs.
2-58
JK FLIP FLOP
Direct
Set In
· If J input is high while all others (Direct
Set out
J
Set In
Q
Set, Direct Reset and Reset) are low, Q
will go high with the trailing edge of the
next clock pulse.
· If K input is high while all others are low,
Q will go high with the trailing edge of the
next clock pulse.
· If both J and K are high, the output will
alternate between Q and Q with the trail-
Clock In
ing edge of each clock pulse.
· If Direct Set is high, J and K are not both
Reset In
Reset out
Q
K
high, the clock is low and Direct Reset is
low, Q out will be high.
· If Direct Reset is high, J and K are not
Direct
Reset In
both high, the clock is low and Direct Set
is low, Q out will be high.
· If J, K, Direct Set and Direct Reset are
all low, the latch will ignore any clock
pulses and remain in its last state.
Preset
D-Type edge triggered F. F.
Data
D
Q
•
If D input is high, PRESET is high
and CLEAR high, Q will go high on
leading edge of clock.
•
Clock
C
Q
If D input is low, PRESET is high
and CLEAR is high, Q will go high
on leading edge of clock.
Clear
•
PRESET and CLEAR are independent
of D and C inputs.
2-59
I·n---....
--Out
Amplifier. The amplifier may have one or
more stages, and mayor may not produce
gain or inversion.
General Logic symbol, for functions not
In - - - I
I---Out
specified. Symbol must be labeled so as
to define the function performed.
The
Ie
components used in the Model 630 are defined below.
2-60
SIGNETICSLOGIC
II
10
9
616A
659A
670A
Q
Ro
K
620A
680A
2-61
SIGNETICS LOGIC (continued)
BASIC
GATE
CIRCUIT
41<
VIN
-.;,.
-A-
~
-+-
-.-
"r-
VIN
. 616A
Vo
670A
680A
-4£r'
~
",I
Eo-----'
Component values shown are typical.
620A
Component
values shown
are
typical
620A
TRUTH TABLE
So
J
K
Q
0
0
0
I
0
Q
0
I
Q
0
0
I
Ro
0
Q
Q
0
0
I
NO ChanQe
Synchronous Inputt
at clock tim.
2-62
SIGNETICS LOGIC (continued)
Vee
8826A PACKAGE
2
4pf
3
4pf
cp
TRUTH TABLE
0
I
0
RO
= 0
0
0
On
I
I
0
=>
8826A
I
an
0=0
n is time prior to clock
n+l is time following clock
V1.N
V1N
v lN
vlN
Buffer /Dri ver
Element - 659A
-A,,,
~
t-~
"*"......
¥
-A-
~.~
E
~
.".
Component values shown ore typical
2-63
4
5
6
7
TEXAS INSTRUMENTS LOGIC
ADDER
0000000
TRUTH TABLE (See Notes 1,2, and 3)
-
en
B
A
Cn+1
0
0
0
0
0
0
I
I
0
I
I
I
0
I
0
0
I
I
I
I
I
0
I
0
I
0
0
I
I
I
-
L
L
I
0
I
I
0
I
0
0
0
I
0
I
I
0
0
0
SN7480
0
I
NOTES: I. A = AlceA c , B= B.... Bc
Where A*= A,eA 2 ,B* = 8 1e 8 2
2. When A
* or B*
are used as inputs,A 1 and A2 0r BI and 8 2
respectively must be connected to GND.
3. When AI and A2 or BI and 8 2 ore u sed as inputs, A
* or B*
respectively must be open or used to perform Det- OR logic.
SUM
CARRY
IN
CARRY
OUT
----I
INPUT
INPUT
A
8
2-64
SN7480
TEXAS INSTRUMENTS LOGIC (continued)
SN7474N
DUAL D-TYPE EDGE-TRIGGERED FLIP-FLOP
vCC
Clear
0
Clock Preset
TRUTH TABLE (Each Flip-Flop)
Q
In + 1
In
OUTPUT
Q
-Q
0
0
1
1
1
0
HOTES: I. In = bit time before dock pulse.
2. tn + 1 = bit time after clock pulse.
Clear
0
Clock Preset
Q
<:i
GND
positive logic
o. Low input to cleor sets Q to logical O.
b. Low input to pre!let set. Q to logical I.
c. Clear or pre,et inputs dominale regardless of
clock and 0 inpuls
2-65
OUTPUT
INPUT 0
MOTOROLA LOGIC
v+
r-----
-----,I
2C>-~----..
....--------010
MC1429G
1---=--09
22.4K
8C>-~~~-1------~
11.2K
....- - - - - - - 0 4
t-----~-o5
5.6K
11.2K
7o--'--~~~~-~--------o6
v-
_ _ _ _ _ _ ...J
v+
I
MC1429G
3O-------f
~:-------02
OUTPUT
INPUT
~--------oIO
9
Gnd.
or
8
Bios
EQUIVALENT
CIRCUIT
2-66
MOTOROLA LOGIC (continued)
3
Vee
II
5
8
14
RI =450n
R2=640n
RI
RESISTOR
VALUES ARE TYPICAL
SERVO AMPLIFIER
MC724P
14
RI=450n
R2=640n
LINE RECEIVER
MC789P
2-67
6
t-:3
10K
@
HQINPUT LAG
V+OG
o
f;
10K
t'I
o
o
I-j
o
INPUT LAG
NON-INVERTING
INPUT
INVERTING
INPUT
A
•
A
UG" PacKGge I
F
0 OUTPUT
r-~------;-~~LAG
B
B
IIFIt Packoge
2
2 3
00
"pH Pockaoe
3
4
C 0 E
3 4 5
456
5 6* I
6
7
18K
G H
7 8
8
10 "
9
12
*Pin 7
conn.ct~d
electricallJ
ta
lubstratt and V-.
DcW-
MC1709C
INPUT
I
INPUT
2
4
5
I
I
o
o
ta
.....
g
.8-
3.6K
F
.-
CD
10K
3K
Cl)
r."
I
•
OUTPUT
C
PIN CONNECTIONS
Schematic
Vh
~
/
10
OUT
SECTION 3.0
THEORY OF OPERATION
The theory of operation for a Model 630 is defined by a set of operational
flow charts and pertinenttiming diagrams. These flow charts include:
A.
Power up, power sequencing
B.
First seek
C.
Programmed seek (three sheets)
D.
Restore-retract
E.
Write operation
F.
Read operation
G.
Normal stop
H.
Controlled power down
1.
Abnormal stop
3-1
IF HEADS ARE RETRACTED
lOoSEC OF DYNAMIC BRAK·
ING. THEN K5 PICKS; THIS
IS INHERENT TO THE SYS-
TEM AND SERVfS NO PUR·
-------
YES
POSE DURING POWER ON;
REFER TO NORMAL STOP
FLOWCHART
SPINDLE DRIVE MOTOR
STARTS IK21
Power Up, Power Sequencing
Figure 3-1
3-2
NO
NORMAL REVERSE SEEK TO
CYLINDER 000 IS INITIATED
,FORCE COUNT OF 204 IS
DIRECT SET IN PRESENT
ADDRESS REGISTERI
REVERSE DRIVE TD
SERVO EOUALS ZERO
DETENT PAWL TAKES AIOUT
3 MS FROM TIME COMPARE
IS REACHED TO ENGAGE
ZERO COUNT PICKS DETENT
ACTUATORS, COMPARE CON·
DITION PROVloes DETENT
VELOCITY POWER IN FOR·
WARD DIRECTION TO SERVO
THE DAMPING DELAY AL·
LOWS TIME FOR OSCILLA·
TIONS RESULTING FROM
THE POGO EFFECT OF
PAWL· RACK ENGAGEMENT
TO DISSIPATE BEFORE
READIWRITE OPERATION
BEGINS
First Seek
Figure 3-2
3-3
MOOEL 630 SELECTED
BY SELECT UNIT LINE
HEAD REGISTER RESET;
THIS AUTOMATICALLY
SE LECTS HEAD 0
YES
CONTROL TAG LINE
DROPPED; SET CYLINDER
TAG LINE RAISED
SET CYLINDER TAG
LINE DROPPED; SET
HEAD TAG LINE
RAISED
NEW CYLINDER
ADDRESS IS ON
BUS LINES 0 - 7
SET SEEK READY
AND GATED ATTENTION
START SEEK INCOMPLETE
SENSE DELAY; THIS IS TO
ALLOW AMPLE TIME FOR
COMPLETION OF THE SEEK
NEW HEAD ADDRESS
IS ON BUS LINES 4 - 7
BUS LINES 4 - 7
GATED TO
HEAD SELECT
REGISTER
SET HEAD TAG LINE
DROPPED; CONTROL
TAG LINE RAISED
SEEK
START
BUS LINE 2
IS RAISED
RESET
ATTENTION
AND SEEK
READY
Programmed Seek (Sheet 1 of 3)
Figure 3-3
3-4
FULL ADDER COMPARES
PRESENT ADDRESS AND
CONTENTS OF CAR; DIF·
FERENCE COUNT CON·
VERTEO TO ANALOG
VOLTAGE AND SENT TO
SERVO; SIGN OF DIFFER·
ENCE DETERMINES
DIRECTION
NOT ZERO DIFFERENCE
AND NO VELOCITY OUT·
PUT FROM TACHOMETER
ALLOW MAXIMUM DRIVE
TO MOTOR
TACHOMETER OUTPUT CAUSES
SERVO AMPLIFIER TO LIMIT
PEAK VELOCITY TO 80 IPS OR
LESS, DEPENDI NG ON THE
LENGTH OF THE SEEK.
-
-
-
-
--
MOTOR ACCE LE RATES
NO
OUTPUT FROM DECODER
OCCURS IN DISCRETE
STEPS > 64, 32, 16, B, 4, 2, 1
NO
YES
CURRENT DIRECTION IS
INITIALLY REVERSED TO
EFFECT DECELERATION.
RATE OF DECELERATION IS
DETERMINED BY TACHOMETER
OUTPUT AND DECODER OUTPUT.
RE~ERS TIJ VELOCITY
PRESCRIBED FOR EACH STEP
OF DECELERATION PROCESS
Programmed Seek (Sheet 2 of 3)
Figure 3-3
3-5
.-._--------- ,
......
YES
REVERSE DRIVE
TO SERVO
EQUALS 0
NO
COMPARE CONDITION
PROVIDES DETENT VELOCITY POWER TO SERVO
(FORWARD!
IF NO DETENT· IN SIG·
NAL GENERATED WITH·
IN DELAY PERIOD; SEEK
INCOMPLETE
GENERATED
DETENT ACTUATOR PICKS;
DETENT PAWL ENGAGES
RACK (OPERATION RE·
QUIRES ABOUT 3 MS!
THE DAMPING DELAY AL·
LOWS TIME FOR OSCILLA·
TIONS RESULTING FROM
THE POGO EFFECT OF
PAWL· RACK ENGAGEMENT
TO DISSIPATE BEFORE
READIWRITE OPERATION
CAN BEGIN
NO
Programmed Seek (Sheet 3 of 3)
I
Figure 3-3
CONOITION,
CYLINDER REFERENCE LOST
DURING SEEK; NO DETENT
IN WITHIN 300 MS; RESULTS
IN SEEK INCOMPLETE
- SELECTED RESTORE SETS
FIRST SEEK LATCH AND
RESETS ON LINE SEEK IN·
COMPLETE AND ATTENTION
SELECTED CONTROL AND
BUS LINE 6
CARRIAGE REVERSES
DIRECTION OF TRAVEL;
DETENT ENGAGES AT
CYLINDER 000
- FIRST SEEK RESETS CAR
AND PRESENT ADDRESS
REGISTER; INITIATES
FIRST SEEK DELAY
DIFFERENCE OF FOUR
FORCED INTO SPEED
DECODE; DETENT IS
PULLED
THE DAMPING DELAY AL·
LOWS TIME FOR OSCILLA·
TiONS RESULTiNG FROM
THE POGO EFFECT OF PAWLRACK ENGAGEMENT TO
DISSIPATE BEFORE READI
WRITE OPERATION CAN
BEGIN
CARRIAGE MOVES TO
FORWARD STOP AT
SPEED DECODE VELOCITY
OF FOUR
NO
NORMAL REVERSE SEEK TO
CYLINDER 000 IS INITIATED.
IfORCED ADDRESS Of 204
IS DIRECT SET IN PRESENT
ADDRESS REGISTERI
NO
REVERSE DRIVE TO SERVO
EOUALSZERD
DETENT PAWL TAKES ABOUT
3 MS FROM TIME COMPARE
IS REACHED TO ENGAGE
ZERO COUNT PICKS DEle NT
ACTUATOR; CO~,PARE CON
DiTtON PROVIDES DETENT
VELOCITY POV.ER IN FOR
WARD DIRECTION TO SERVO
Restore Retract
Figure 3-4
3-7
THIS OCCURS WHEN SUS
LINE 0 IS RAISED IN CON·
JUNCTION WITH CONTROL
TAG AND SELECT UNIT
LINE
SELECT WRITE
GATE IS RAISED
THIS OCCURS WHEN BUS
LINE 4 IS RAISED IN CONJUNCTION WITH CONTROL
TAG AND SELECT UNIT
SELECT ERASE
GATE IS RAISED
THIS OCCURS WHEN BUS
LINE 5 IS RAISED IN CONJUNCTION WITH CONTROL
TAG AND SELECT LINE
SELECT HEAD
IS RAISED
THIS OPERATION
IS PERFORMED BY
THE CONTROLLER
SELECTED FILE UNSAFE
IS SENT TO CONTROLLER
Write Operation
Figure 3-5
3-8
INITIAL CONDITIONS: START, UNIT READY
AND FILE SAFE
THIS OCCURS IIfHEN BUS
LINE 1 IS RAISEO IN CON·
JUNCTION WITH CONTROL
TAG AND SELECT UNIT
SELECT READ GATE
IS RAISED
YES
Y~S
NO
SELECTED FILE UNSAFE
IS SENT TO CONTROLLER
NO
Read Operation
Figure 3-6
3-9
CONTROL PANEL
SWITCH TO STOP
POSITIONER IS FORCED
INTO SLOW REVERSE
STOP/RETRACT
SIGNAL IS GENERATED
NO
YES
POWER REMOVED FROM
SPINDLE DRIVE MOTOR
(K2); POWER REMOVED
FROM LOGIC FILE (K4)
DYNAMIC BRAKING
APPLIED TO SPINDLE
MOTOR VIA TIME
DELAY K5
MOTOR STOPS; K5
PICKS AND REMOVES
POWER FROM DYNAMIC
BRAKING AND LINEAR
POSITIONER MOTOR
SPEED SENSOR RE LAY
K3 DROPS, BUT SERVES
NO PURPOSE DURING
ROUTINE STOP
Normal Stop
Figure ,3-7
3-10
CONTROLLER DROPS
CONTROLLED GROUND
LINE IN J3; K3 DROPS OUT
POSITIONER IS FORCED
INTO SLOW REVERSE
NO
1---
-,
Ir----~____.I
I
POWER REMOVED FROM
SPINDLE DRIVE MOTOR IK21
I
I
I
THESE EVENTS ARE
IDENTICAL TO THE
LAST THREE EVENTS
IN.A NORMAL STOF
t
---- - - - - - -1
I
OVNAMIC BJIAKING
APPLIED TO SFINDLE
MOTOR VIA TIME
DELAY K5
I
I
I
I
I
I
II
I
MOTOR STOPS; K5 PICKS
AND REMOVES POWER
FROM DYNAMIC BRAl(ING
AND LINEAR POSITIONER
MOTOR
I
II
I
L ______ -.J
Controlled Power Down
Figure 3-8
3-11
CONTROL SWITCH
IN START POSITION
LOSS OF AC POWER
K4 DROPS OUT, PROVIDING
EMERGENCY RETRACT SIGNAL,
RETRACTING HEADS IF HEADS
ARE EXTENDED. STORED EN·
ERGY IN 36 VDC SUPPLY
PROVIDES POWER
ALL OTHER RELAYS DROP
OUT; MOTORS COAST TO
STOP, DYNAMIC BRAKING
IS NOT APPLIED
)~
Abnormal. Stop
Figure 3-9
3-12
1I0ff I; "
_,IT H.f' I.
SWITCIt 'I AT 1'0" ••'T UIIT'L IWlTeN .. AT IT... T.
1I0Tl I' " '.,TeN 'S AT ,f.p, MOUE"CI VOL TAli TO IIIn
ottlYI " ItY," ,_oIAULT.
110"1 S: ...... LI¥IL . , LlIIf. t . . .caT,1 acTI'II: COII"'tOll.
"'" . ,....., " ....1'. . . LlV",.
FOIl '"OSI
caLUO OUT 1'1 1I0tt: J. OScn.LO.COPI
,.acE _0111,.0 I. lIlY': • • 0' L".
.....
ITOI' IWIT"
y
L'"'I
... TIUCTID
S~y"
,'r-..... ·_· .. 1 .. ·.....
ILOWf" 0., '-'1 VIC...
,=TC·O~;:~
K' nlUlltC1 W£L1It'
I • •' . ,
. , .Tott .. IL ....
'000••
IIOYOII 7.", SPUD
sr:'''MtI VOl. T&til Tin OIlIYt
...... UP , . "LAY
POw,II" aEtn
t.:l
I
1001.
10.'"
o
loOlot
.1.lot
. , IDOl ••
.'r--
~
,-" ..
~
.
'
-"r-'
-----J,\
---'Ii
UIi
)r-I
:I
I
"
I
\ \ "" ,:
"" ,
,, _______
,
i----+:-:i.--- .'L'....IC --.,
"onr~.~
I'
I
" ;\~
,
',I ______
I
~'~'--;_----"
I
10.4, TPI
'''IT IIU 'L. .... 'LOP
le.I.1
..oTIS
eeo ..
-----J,nCLI ... "".C••;MIU-UIIUU-)
joMI
t.:l
, . , .na
hAIU:
. , 10••••
+ Ilia
I""ILI
1001.S
'eMlCf II"'II'NCI
+ ..~
T. HIIVO
+ ••
DIIIWl
_..
FOliC. COWl' TO P_
'01tC1 nIT
lUI '4..-1"1,.0.
"0.,.
A.4, "P'
BVI• • TO
ME.OJ IIITIIACTID
IDIF;iWEIIC----r-.,-il
1110. . . . .0
10••• '
---!
a•••
....
'001"
---f . . I.
1001'1
"., ",.
YO'TO--PO-'TIQM; •
I
~IO.
~~,
11.1'1
" . , 'PI
IOMIS
qns
I
"Nt, ---'I,
.T.aCT dAD'
IDOl.,
-,,"OW 1tl'fIItH
AO••
1001'1
fIOti S
10.
It(YEltIl
Cn
....I.' '~:.......
,U4P 100llS
..,41
D"'F'HIICI Of' • •'11.1£
~~
~~
~tJ
I
~
....-.c ..... , .. loon
Power Sequence
Figure 3-10
NOTE
8US
II
eus
SE T CYLINDER I AG LINE
128~
a
:=
HEAD
CONTROL TAG
'~
"""
2006'0
TAG
S~
200610
200610
SEEr< START
2006'0
HEAD ADDRESS
~EGISTER CONTENT
l0061Q
vOOO~'4
CAR CONTENT
200611
c , O - - 69
200611
I
CO",PAAE
200613
O~~
SEEK RUDY
ATTENTION
200614
2006'5
20061~
~~
J
,
fr1'----------I
I
I
a ----,e
000
'r-'
I
1
I
I
t
I
I
I
!
t
I I I I
3t23? 1 I
f
I
I
I;: ;
I I '
I
I
1:
i':
1
':
I
,, ,
I
I
I
I
1
69
I
,.
,
,
I
I
S~I
IV
;;
,,"r~
,I
I
I
I I
Iii
:
'I
I
I
I
,
:,~
I
I"
I
I
,
I
I
I I!
I II
I I,
I
I
--....j
I
I
:dj,MS F
I
I
J
1
i
i
"--.J~s
TRACK VELOcny I
30M5
1
1
r~
II
I
DELAY TO
PULL DETENT
I
60
I
il: ~s~~
1
I I
, I'
I I
I
!
0--;--55---9
5132168
I
I
)1---~O
I
I
I
I
69~S
I
I I I
I
1r---r- 5
f
i I I
f
r
I:
I
I
,
•
'~L.._ _- - ' - _
~
I
'
5S
,
,
,
>32
32
16
*ry,J1 : ' n
II
I
200615
DETENT
\~L-_____________________
200612,.000--68----68-----161
~~~
DIRECTION
sr---il
~
LINE
PRESENT ADDRESS
REGISTER CONTENT
\r--n~-----------------
f-----Jl
~ n
SELECT UN!T
DIFFERENTIAL OUTPUT
OF ADDRESS
\~~----------------
I
1~
7
n
~~~------------------------------
2
I
W
I
?~
n
.~
2006'0
SET
i)
8------
5
SHEET 51 OF 59
TIME lI"'t~ 'NDICATE ACTiVE (HIGH) ANO
INACTIvE (LOW) CONDITIONS, IItOT RELATIVE
VOLTAGE LEVELS
I
--: 'MS~
,
,,
>--
"
II
II
:!
Ii
II
II
I'
CARRIAGE fIotonON
I.
>32
.. REAO GATE PULSED
TO RESET ATTENTION
IN DRIVE UNIT
Seek
Figure 3-11
SEEK
CYLINDER 0, HEAD 0 TO CYLINDER 69, HEAD 4
CYl.INDER 69, HEAD 4 TO CVUNDER 60, HEAD 5
aUI-I
....
.IS·ZI
CONTROL
20011~
~
.1'·21
SELECT UNIT
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F.
While holding the assembly clear of the cam with one hand, work the
other end free of the T-bar slot. Keep the leaf spring straight until
the head shoe is completely clear of the other head-arm assemblies.
*CAUTION*
Maintain a secure hold on both ends of the
assembly. As soon as the arm is out of the
T-bar slot and off the cam. the leaf spring
will suddenly attempt to unflex. If this is
allowed to happen. the head shoe will slap
against another head-arm assembly.
G.
To install a head-arm assembly, reverse steps A through F.
*NOTE*
The head must be mounted so that the bleed
holes relative to disc pack rotation are
located in the leading half of the head shoe.
The disc pack rotates counterclockwise.
Whenever a read/write head is replaced, an alignment check must be made on
it and the two adjacent heads (one adjacent head if the replaced head is at the top or
bottom of the T-bar) . This is advisable because the adjacent head-arm assemblies
may move slightly when the clips they share with the replaced head are rp.moved.
4.3.3
Head Alignment Check
4.3.3.1
Preliminary Steps
The following preparations must be made before head alignment can be
analyzed.
A.
See that the shroud is in place.
B.
Install a CE disc pack (yellow shield; IBM piN 2200018)
*CAUTION*
Be certain the carriage and heads are fully
retracted before installing or removing a
disc pack.
4-10
C.
Preparation of Off- Line Tester
To substitute a PSC off-line tester for the controller , perform the following
steps (ignore step C and move to step D if an off-line tester is not available).
D.
1.
Select DISABLE with the ENABLE-DISABLE switch on the
Model 630 operator control paneL This puts the drive off line.
2.
Check to be certain all switches on the off-line tester are in
the OFF position.
3.
Remove paddle boards C26, C27 and C28 from the card file.
This prevents communication with the controller on the Signal
in, signal out and dc lines.
4.
Insert the appropriate off-line tester paddle boards into card
file locations C26, C27 and C28.
Head and Pack Thermal Equilibrium
The temperature stabilization cycle, which assures standard operating temperature during head alignment, consists of two phases:
E.
1.
Run the drive, with a CE pack installed and all covers on for
1 hour and 15 minutes.
2.
Run the drive, with a CE pack installed and the two top covers
off, for 20 minutes.
Scope Connection
. Use a scope with direct probes (1:1 attenuation). Set its display to A+B so
the two test points are read differentially. Set the vertical scaleat 5 m v / cm
and the sweeprate to 3 ms/cm (or enough to observe one tevoltiticm). ;
Connect one probe to TP-1 on the read amplifier card (located in A/B16).
Connect the other probe to TP-2 on the same card. The scope should be
in an external sync mode with the sync point on -index (located at TP-6
on card; A23 in the logic file).
F.
Remove the transducer oscillator board from slot B26.
Once these preparations have been completed, the off-line head alignment
check can be performed.
4.3.3.2
Head Alignment Check
Perform steps A through H if an off-line tester is being used and bypass
step I. If an off-line tester is not available, substitute step I for A through H.
A.
Position the heads to cylinder 73 with the off-line tester.
1.
Rotate the SELECT OPEHATION dial to ALTERNATE CYLINDER.
2.
Throw toggle switches 1, 8 and 64 to ON and throw the LOAD
ADDRESS toggle (momentary switch). This loads the binary
equivalent of 73 into the cylinder address register.
4-11
3.
Throw the SINGLE CYCLE momentary switch. This positions
the heads to cylinder 73.
4.
Return all off-line tester switches to OFF.
*CAUTION*
Before going further, be certain that the
head about to be checked is deselected.
If the next step is performed while the head
is selected, the track will be erased.
B.
Disconnect the head plug from its board (select/read preamplifier or
select/write amplifier and coax receiver).
C.
Insert the head plug into a head alignment plug; insert the head alignment plug into /the socket from which the head plug has just been removed.
D.
Throw the RESET HEAD switch and SINGLE CYCLE momentary switch.
Return the RESET HEAD switch to OFF.
E.
Select the head by throwing the appropriate toggle switches and the SET
HEAD momentary switch to ON. Sum of switch values equals the head
number; e. g., head 3 is selected by switches 1 and 2. This loads the
numbers (e. g., 1 and 2) into the head register. Return switches to OFF.
The WRITE and READ switches (128 and 64) must be OFF.
*NOTE*
To select head 0, throw the RESET HEAD
switch and single cycle momentary switch;
this fills the head register with zeros.
F.
Throw toggle switch 4 to ON. Tpis brings up the enabling line called
head select. Return switch 4 to OFF.
G.
Rotate the SELECT OPERATION dial to READ.
H.
Throw toggle switch 64 to ON. This enables the selected head to read.
The read operation causes a signal to appear on the scope. When the
head is aligned, the trace will resemble the curve in Figure 4-7.
1.
The following steps must be performed if an off-line tester is not
available.
1.
Position the heads to cylinder 73 via the controller.
2.
Select DISABLE with the ENABLE-DISABLE switch.
4-12
*CAUTION*
Before going further, be certain that the
head about to be checked is deselected.
If the next step is performed while the head
is selected, the track will be erased.
3.
Disconnect the head plug from its board (select/read preamplifier or select/write amplifier and cbax receiver).
4.
Insert the head plug into a head alignment plug; insert the head
alignment plug into the socket from which the head plug has just
been removed.
5.
Select the head by jumpering it to ground.
*NOTE*
If other -heads in the same bank are to be aligned,
their head plugs can be inserted in the alignment
plug in its present location. This makes it unnecessary to move the alignment plug and jumper
lead from socket to socket.
6.
A read signal should appear on the scope. When the head is
aligned, the trace will resemble the curve in Figure 4-7 .
Vertical: 5 mv/div
Sweep Rate: 2 ms/div
Head Alignment Read Signal at One Revolution
Figure 4-7
4-13
4. 3. 4
Head Alignment
The following alignment procedure assumes that the conditions necessary
for performing a head alingment check (described in Section 4.3.3.1) are satisfied.
In addition, check to be certain that the DISABLE switch on the Model 630 is depressed, all switches on the off-line tester are OFF and the three off-line tester
paddle boards are plugged into slots C26, C27 and C28 in the logic file.
Finally,
position the heads to cylinder 73 of the CE disc pack if they are not already there.
*CAUTION*
Before going further, be certain the head about
to be aligned is deselected. If the next step is
performed while the head is selected, the track
will be erased.
A.
Remove the head plug of the head to be aligned from its socket in the
select/read preamplifier or select/write amplifier and coax receiver
card.
*NOTE*
If all the heads on the front side of the T-bar
(B and D type heads) are to be aligned, start
with the bottom assembly and work up.
If all the heads on the back side of the T-bar
(A and C type heads) are to be aligned, start
with the top assembly and work down.
B.
Insert the head plug into the head alignment plug and insert the head
alignment plug into the socket from which the head plug was just
removed.
C.
Throw the R.ESET HEAD switch and SINGLE CYC LE mcmentary switch.
Return the RESET HEAD switch to OFF.
D.
Select the head with the off-line tester by throwing the appropriate toggle switches and SET HEAD momentary switch to ON (the sum of the
switch values equals the head number; e. g., to select head 3, throw
switches 1 and 2). This sets the head number in the head register.
Return the switches to OFF. The WRITE and READ switches (128 and
64) must be OFF.
4-14
*NOTE*
To select head 0, throw the RESET HEAD
switch and SINGLE CYCLE momentary
sWitch; this fills the head register with
zeros. Return the RESET HEAD switch
to OFF.
E..
Throw toggle switch 4 to ON. This raises the enabling line called
head select. Return switch 4 to OFF.
F.
Rotate the SELECT OPERATION dial to READ.
G.
Throw toggle switch 64 to ON. This enables the head to read. The
read operation causes a signal to appear on the scope. When the head
is aligned, the scope trace will resemble the curve in Figure 4-7.
H.
Loosen the four screws of the two clamps which hold the head-arm
. assembly in place just enough to allow the assembly to move when
forced with a moderate pressure.
I.
Push lightly against the tab on the head-arm assembly with a head
alignment tool so that the assembly moves all the way back in its
slot against the T-bar.
J.
Tighten one of the clips (bottom clip for a B or D type head; top clip
for an A or C type head) with a torque wrench set at 6-8 inch-pounds.
Refer to Figure 4-5.
*NOTE*
The alignment tool should always push back
against the clip that is tightened down. Since
the tool twists clockwise, the bottom clip must
be tightened on the front side of the T-bar and
the top clip on the back side.
K.
While observing the trace on the scope, carefully twist the alignment
tool clockwise so the assembly moves forward (toward the spindle).
Stop twisting as soon as a trace resembling the curve in Figure 4-7
appears on the scope.
L.
If the head goes too far forward, return to step 1.
*N01'E*
Do not try to align the head while pushing
the assembly back. Always align the head
while adjusting it in the forward direction.
4-15
M.
Before tightening the other clip, check the alignment of the adjacent
head(s). To do this, it will be necessary to deselect the head just
aligned and select an adjacent head.
1.
See that all switches on the tester are OFF.
*CAUTION*
Before going further, be certain the head just
aligned and the head about to be checked are
both deselected.
N.
2.
Remove the head alignment plug from its present head plug and
install it on the head plug about to be checked. Return the head
plug of the head just aligned to its socket and insert the head
alignment plug in its socket.
3.
Throw the RESET HEAD switch and SINGLE CYCLE momentary
switch. Return the RESET HEAD switch to OFF.
4.
Select the head by throwing the appropriate toggle switches and
the SET HEAD momentary switch to ON. Return switches to
OFF.
5.
Observe the scope trace and align the head if necessary, using
the technique described in steps A through K.
When the adjacent heads are aligned, check to be certain all clips
are tight.
4-16
4.4
INDEX TRANSDUCER BLOCK ALIGNMENT
Accuracy of carriage tracking and alignment of the index transducer block
are checked using the burst track located at cylinder 003 of the CE disc pack (yellow shield; IBM PiN 2200018).
The following alignment check and adjustment
procedures assume that the preparations described in Section 4.3.3 have been
completed.
4.4.1
Transducer Output Amplitude
Amplitude of the index transducer output should be 0 between slots and 400 mv
at the slots.
put.
Refer back to Figure 2-21 for an illustration of index transducer out..,
If the trace observed on the scope does not meet these amplitude requirements.
the following adjustment should be made.
A.
Slowly turn the adjustment nut located on the back of the transducer
block (see Figure 4-8) counterclockwise until the trace on the scope
meets the 0 to 400 mv standards. If this does not happen after one
full turn. go on to step B.
B.
Slowly turn the adjustment nut clockwise until the trace is satisfactory.
Be prepared to reverse direction with the wrench. Clockwise adjustment moves the transducer toward the disc and the disc may begin to
rub against the back face of the channel in the index transducer. If
this happens. back the nut off 3/4 of a full turn. This will set the
transducer for optimum output.
Index Transducer
Figure 4-8
4-17
Index Transducer Block Alignment Check
4.4.2
A.
Position the heads to cylinder 003. *
1.
Rotate the SELECT OPERATION dial to ALTERNATE CYLINDER.
2.
Throw toggle switches 1 and 2 to ON and throw the LOAD ADDRESS
momentary switch. This loads the binary equivalent of 003 into
the cylinder address register.
3.
Throw the SINGLE CYCLE toggle SWitch.
heads to cylinder 003.
4.
Return all switches to OFF.
This positions the
*CAUTION*
Before going further, be certain that all heads
are deselected. Bit switch 8. SELECT HEAD
must be down (OFF).
B.
Throw the RESET HEAD switch and SINGLE CYCLE momentary SWitch.
This loads the head register with zeros. Return the RESET HEAD
switch to OFF.
C.
Select a head by throwing the appropriate bit switches and the SET HEAD
momentary switch to ON (head 0 was selected by step B). The sum of
the bit switch values equals the head number. This operation loads
the number into the head register.··
*NOTE*
Bit switches 16, 32, 64 and 128 must be
OFF during head selection.
*
D.
Throw bit switch 4 (SELECT HEAD) to ON.
select line.
This enables the head
E.
Rotate the SELECT OPERATION dial to READ.
F.
Throw bit switch 64 (READ) to ON. This enables the selected head to read.
G.
Check the burst pulse timing as read by each head. If all heads seem to
be off by approximately the same amount, the index transducer block
must be adjusted.
Refer to Section 4.3.3.2, Step I for head positioning and selection without
an off-line tester.
4-18
4.4.3
Index Transducer Block Adjustment
While observing the burst track display on the scope, tighten the adjustment
nut slightly (see Figure 4-8).
closer to the 20
~
If tightening the nut causes the read pulses to appear
4J..63 range after index, continue tightening until they fall within
that range. If not, loosen the nut until the read pulses occur after the optimum
interval.
See Figure 4- 9.
Vertical: 50 mv/div
Sweep Rate: 5/ls/div
Index Transduc\u- Alignment Output
Figure 4-9
4-19
4.5 CYLINDER TRANSDUCER
4.5.1 Drive Preparation
The cylinder transducer installation and adjustment procedures require the
following:
A.
Both top covers and the shroud removed from the Model 630.
B.
Turn power off at main power switch, Sl.
C.
Remove 36V from servo drive, sixth wire from left (red) on the
terminal board of the servo amplifier plate (as shown in Figure 4-10).
D.
Unplug the spindle drive motor to prevent continuous dynamic
braking, which would result in overheating.
E.
Remove the Actuator Logic Driver board, A26, from the logic file.
This allows manual operation of the detent pawls.
F.
Close the main power switch Sl (on).
G.
Select STOP on the START-STOP switch.
4.5.2 Transducer Installation
A.
Insert the leaf spring in the round hole in carriage way (A in
Figure 4-11).
B.
Place transducer on way so that the back of base is up against the leaf
spring and the right side of the base rests against the locating pin
(B in Figure 4-11).
C.
Turn the pivoting screw counterclockwise to draw it back away from
the transducer base (C in Figure 4-11).
D.
Push draw-back screw through the hole in its post and start its thread
in the threaded hole in the back of the transducer base (D in Figure 4-11).
Turning this screw clockwise will pull it into the transducer base until
the washer reaches the post. After that, more turning will pull the
transducer back away from the rack.
E.
Screw in hold-down screw until it is snug (E in Figure 4-11).
F.
Turn the draw-back screw (D) clockwise while moving the carriage
forward. Draw the transducer back just enough to allow the carriage
to slide past the transducer.
4-20
Servo Amplifier Terminal Board
Figure 4-10
4-21
Cylinder Transducer
Figure 4-11
4.5 . 3 Prepare Oscilloscope
A.
Set the amplitude scale at 100 mv/cm and the sweep speed at 5 ms/cm.
B.
Connect the scope probe to TPI on the Transducer Comparator board.
4. 5.4 Preliminary Alignment
A.
Move the carriage by hand to the home position (cylinder 000).
Although the scale on top of the T-bar identifies home position, its
accuracy should be checked by examining the position of the detent
pawls with respect to the rack (refer to Figure 4-12~. When the carriage is in the home position, the bottom pawl is engaged and there
are two rack teeth in back of the top pawl.
B.
Move the carriage to cylinder 200 as identified by the scale. From
200, the carriage can be moved to cylinder 202 by steps. Since the
bottom pawl is engaged at 200, disengaging the bottom pawl while
keeping a slight forward pressure against the carriage will cause the
top pawl to engage at 201. Next, disengage the top pawl and allow
the bottom pawl to engage at cylinder 202.
4-22
FORWARD
REVERSE
......
- - . - - - - - - - - CARRIAGE M O T l O N - - - - - - - -........
TOP DETENT
(ODD)
Rack and Pawls at Cylinder 000
Figure 4-12
REVERSE
........- - - - - - - - CARRIAGE MOTION
ADJUST FOR ,
CORRECT OUTPUT
Rack and Cylinder Transducer at Cylinder 202
Figure 4-13
4-23
FORWARD
---------il..-
C.
The left transducer coil (the slot closest to the linear motor) should be
just to the left of the last rack tooth. If it is directly in front of it or
to the right, the transducer must be pivoted counterclockwise. To do
this, turn the pivot screw clockwise until the coil is in the proper
position. See Figure 4-13.
4. 5. 5 Final Transducer Alignment
A.
Observe the scope trace while turning the pivot screw clockwise (this
operation pivots the transducer counterclockwise and'causes the left
transducer coil to line up with the last tooth on the rack). As the
transducer begins to pivot, the amplitude of the trace will either begin
to decrease or increase, depending on the initial position of the transducer coil with respect to the null. If it is at the position represented
by A in Figure 4-14, it will decrease until it reaches the null and then
begin to increase. If it is at the position represented by B, it will
increase first. Shortly after the coil passes position B, the trace will
reach its maximum amplitude and begin to decrease. As soon as the
amplitude decreases about 10% stop turning the pivot screw. The coil
will be in the position represented by C. As a final check, push
lightly back against the carriage. The amplitude should increase
slightly.
.
,
(approx. 10%)
1
I
,
Reference Points for Final Transducer Alignment
Figure 4-14
B.
Disengage the detent pawl and try to move the carriage. If there is
resistance to movement, it means the transducer is too close to the
rack. There are two methods for correcting this condition. Method 1
should be applied first. If it does not succeed, use method 2. If there
is no resistance, go on to section 4.5.6.
4-24
C.
1.
With a beryllium screwdriver, push the front end of the carriage
sideways across the carriage way. The best approach for this
is to push against the side of the carriage with the screwdriver
blade inserted under the detent pawls. This will open a gap
between the rack and transducer. Slip a piece of sandpaper
(#600 emery cloth) between the rack and transducer with the
abrasive side toward the transducer. Leave enough sandpaper
above the rack and transducer to hold with your fingers. Gently
allow the carriage to move back into position. Bend the sandpaper back over the rack and crease it so that the rack becomes,
in effect, a sanding block. Now roll the carriage back and forth
several times, sanding the face of the transducer. After the
first two or three passes, remove the sandpaper and check the
carriage's freedom of movement. If the first sanding did not
free the carriage, repeat the process one more time. If the
second attempt does not succeed, go on to method 2.
2.
Turn the pivot screw counterclockwise to relieve pressure on
that end of the transducer base. Then turn the draw-back screw
slowly clockwise. This will pull the transducer assembly back
away from the rack. Be sure to bring it back only far enough to
free the carriage. The larger the gap is between the transducer
and rack the lower the amplitude will be of the transducer comparator output.
Move the carriage back to cylinder 202 and reexamine the position of
the left transducer coil to be sure the transducer is still aligned.
4.5.6 Amplitude Adjustment
A.
Check the amplitude of the trace when detented at cylinder 000. It
should be at least 450 mv. It can be any value above that but should
not be less than 450 mv. Simulate forward holding current during
this check by pushing lightly against the T-bar. .
B.
Check the amplitude of the next few cylinder positions until you are
satisfied that the worst-case amplitude is not less than 450 mv. It is
probably not necessary to check amplitude at all cylinder positions
since the lowest amplitudes typically appear at or near cylinder 000.
However, it is best to test adjacent (odd and even) cylinder positions.
C.
If amplitudes less than 450 mv are found at one or more cylinder
positions, detent the carriage at the cylinder showing the lowest
amplitude. With the blade of a beryllium screwdriver set against the
back of the leaf spring, tap the handle of the screwdriver lightly until
the amplitude goes above 450 mv. This technique is capable of increasing the amplitude by about 50 mv. If the deficiency is greater
than that, turn .the draw-back screw counterclockwise a quarter turn.
If necessary, tap the leaf spring again. Check for clearance between·
the transducer and rack by pushing against the back of the transducer
(where the coils are, not at the base). If there is clearance,
comparator output amplitude will increase. If it stays the same or
4-25
decreases, the transducer is too close to the rack. In that case, the
sandpaper should be used again. Push the carriage back slightly;
the amplitude should increase about 10% indicating that the transducer
is still properly aligned (as described in section 4.5.5 A). If the
amplitude decreases or increases significantly more than 10%, repeat
the procedure described in section 4.5.5 A ..
D.
Return to the other cylinder positions which showed insufficient
amplitude and check the comparator output again as well as clearance
between the transducer and rack.
E.
As a final check, move the carriage back to cylinder 202. The left
coil of the transducer should be centered on the last tooth.
4. 5. 7 :Unusual Conditions
A.
Occasionally, you may find a transducer whose adjacent peak outputs
are unequal. This is most likely caused by an uneven surface on the
transducer face. In such a case, sand the transducer face using the
technique described in section 4.5.5 B. It may take more than the few
passes mentioned in that description to resurface the transducer face
and balance the coil outputs. However, if two dozen or so passes do
not solve the problem, replace the transducer.
B.
There should be no nulls along the rack higher than about 70 mv. High
nulls can be decreased by sanding the transducer face. Since this
process decreases both peak and null amplitude, check to see what
effect the sanding has on the peak amplitude. If that is below 450 mv
when the carriage is detented, the transducer must be moved closer
to the rack. See section 4.5.6. Figure 4-15 shows a correct cylinder
transducer output waveform.
4. 5. 8 General Transducer Characteristics
The following list defines the factory specifications used in checking
cylinder transducers.
A.
Minimum peak amplitude when the carriage is not detented is 580* mv.
B.
Minimum peak amplitude when the carriage is detented is 450 mv.
C.
Maximum null amplitude is 70 mv.
*Beginning with SiN 455 transducer oscillator
voltage may be set anywhere within
the range of 4 volts peak-to-peak to 7 volts peak-to-peak to raise the secondary
coil peak output above the required minimum of 580 mv. This adjustment can be
substituted for, or used in conjunction with, the physical adjustment of the cylinder
transducer. This new voltage level will not affect the 70 mv maximum null level.
4-26
Vertical: 100 mv/div
Sweep Rate: 2 ms/div
Cylinder Transducer Output
Figure 4-15
While these values specify maximum and minimum levels, levels above the minimum or below the maximum specifications are acceptable. Nor do output levels
need to be consistent for all cylinder positions. It is only required that no peak
fall below the minimum specifications and no null go about the maximum
specification.
4.5.9 Returning the Drive to Service
A.
Turn power off at Main Power switch, S1.
B.
Return the 36v to the servo drive, sixth wire from left (red) on the
terminal board of the servo amplifier plate (see Figure 4-10).
C.
Return the Actuator Logic Driver board, A26, to the logic file.
D.
Close the Main Power switch, Sl (on).
E.
Select START on the START-STOP switch.
4-27
4.6
SPINDLE DRIVE MOTOR REPLACEMENT
4. 6. 1 Motor Plate Assembly Removal
A.
Turn power off at the main power switch Sl and disconne.ct the drive
motor power plug from the interior control panel.
B.
Remove the spindle drive belt (see Section 4. 7 for removal procedure).
C.
Place a support block (approximately 2.38 inches high) on the cross
member of the interior control panel under the drive motor ..
D.
Break the lock-tite adhesive bond holding the three shoulder s.crews
(see Figure 4-16) and loosen the screws.
E.
Pivot the motor plate assembly slightly to extend the belt tension
spring. Remove the two shoulder screws and plastic washers in the
slotted area.
F.
Allow the motor plate assembly to pivot back, releasing tension on
the spring, and remove the remaining sho~lder screw and washer.
G.
Lift the motor plate assembly from the drive.
H.
Remove the four sets of nuts and lock washers, offset bracket,
vibration mount - hex standoff assembly and pulley.
4. 6. 2 Motor Plate Assembly Installation
A.
Install the vibration mount - hex standoff assembly, offset bracket
and four sets of nuts and lockwashers.
*NOTE*
Be certain the spring bracket orientation corresponds to Figure 4-16.
B.
Install the motor plate to the vibration mount studs and secure with
the four nuts and lock washers.
C.
Install the motor pulley and position it on the motor shaft so that the
distance from the top face of the pulley to the top surface of the motor
plate is 0.240 .:!: 0.015 inches.
D.
Apply lock-tite adhesive (PSC PiN 110877) to the shoulder screw
threads.
.
E.
With the motor supported by the 2.38 inch high block, insert the
shoulder screw and washer in the pivot hole located in the deck
plate. Snug down the screw (finger tight).
F.
Fit the free end of the belt tension spring into the groove on the post
and pivot the motor plate assembly slightly to extend the spring.
G.
Install the two shoulder screws and washers in the slotted holes.
H.
Allow the motor plate assembly to pivot back, releasing tension on
the spring.
BACK SHOULDER
BOLT
PIVOT
MOTOR
Drive Motor and Mount Assembly
Figure 4-16
4-29
I.
Tighten all three shoulder screws to approximately 10 inch-Ib of
torque. Excessive tightening will indenfthe aluminum base plate. /
J.
Install the drive belt (see Section 4.7 for installation procedure).
K.
Insert the drive motor power plug in its socket.
4-30
.!, 7
SPINDLE DRIVE BELT REPLACEMENT
A.
Remove front panel. turn off main power switch, Sl, on interior control
panel and unplug the spindle drive motor.
B.
Pivot the drive motor on its back shoulder bolt (see Figure 4-16): this
will allow enough slack in the belt for it to drop off the pulleys.
C.
Slip the belt between the pack-on switch and the bottom of the spindle;
nO\v the belt can be removed from the drive.
D.
If the pulleys are not clean, clean them with isopropyl alcohol,
PiN 110939.
E.
Install a new belt.
*NOTES*
F.
1.
Be sure the replacement belt is the right
length for the drive: 60 Hz drives use
PiN 200230: 50 Hz drives use PiN 20025:3.
2.
The smooth side of the belt should be
inside against the pulley faces.
3.
The belt should be centered on the flat of the
motor pulley.
Check pack-on switch clearance: see Section 4.8 for details.
4-31
4.8
SPINDLE ASSEMBLY REPLACEMENT
A.
With the main power switch, S1, off, remove' the shroud area top
cover, shroud, filter, filter mount and spindle drive belt (refer to
Section 4.7 for belt removal procedure). .
B.
Remove all four spindle flange bolts.
C.
Lift the spindle out of the baseplate.
D.
Install new spindle assembly, pIN 200003, and tighten the flange bolts
securely.
*NOTE*
Be sure the new spindle pulley is clean; if it
isn't, clean it with isopropyl alcohol (PIN 110939).
E.
Replace the spindle drive belt.
F.
Check brake pawl-to-pulley clearance. If necessary, deform the
linkage rod to provide the necessary clearance (0.100 +0.050 inches).
See Figure 4-17.
-
G.
Install a disc pack on the spindle and check clearance between the
bottom of the spindle and the lower contact arm of the pack-on switch
(see Figure 4-18). If necessary, deform the upper contact arm of the
switch to allow 0.025 +0.010 inches of clearance.
.
H.
Remove disc pack and replace the filter mount, filter and shroud.
1.
Check head alignment. See Section 4.3 for head alignment procedure.
4-32
'Brake Pawl-to-Spindle Pulley Clearance
Figure 4-17
0.025
! 0.010 Inches
Pack On Switch to Spindle ClearaQ.ce
;
Figure 4-18
4-33
4. 9
TORSION ROD REPLACEMENT (located in shroud area cover)
A.
Turn off the main power switch, which is located on the interior
control panel.
B.
Remove the disc pack, if one is installed.
C.
Remove the shroud area cover:
(1)
release the two latches located at the back of the machine
,where the top cover meets the main frame
(2)
tilt the rear of the cover assembly up to approximately 50
(3)
pull the assembly toward the front of the drive approximately
3/4 inch
(4)
lift the cover straight up and off the machine.
*CAUTION*
•
Do not hit the index transducer or the PC board
mounted on the cam tower.
•
Hold the cover with both hands in a way that will
keep the door closed no matter how the cover
assembly is tilted. This is important for the
next step.
D.
Stand the top cover assembly on a clean, flat surface in a vertical
position (900 from normal on its rear surface).
E.
Allow the door to lie back gently into a fully open position. This
releases tension on the torsion bars.
F.
Remove the two plastic clamps which bundle the four torsion bars
(each clamp holds three bars).
G.
Lift the torsion bars out of their respective slots in the two plastic
bearing blocks.
*NOTE*
Rods which miss contact with the hinge (when the
the door is fully open) by more than O. 03 inch
should be replaced.
H.
Install torsion rods by reversing steps A through G.
*NOTE*
The first two rods installed should always be
on the same side (i. e., install the upper rod
and the lower rod on one Side; then install the
upper and lower rods on the other side).
4-34
I.
Lubricate the rods sparingly at points of friction with a silicone
grease (PSC PiN 110875) or a similar nonbleeding grease.
4-35
4.10
DOOR STABILITY ADJUSTME'NT
The door normally requires 3 lb + 1 Ib of lifting force initially to open it.
The spring loaded roller arm, which is-responsible for maintaining stability in
the door in both closed and open positions, can be adjusted to vary the lifting
ease of the door.
A.
Remove the -roller arm torsion rod from its slots; remove the
stationary end first.
B.
Remove the three screws which hold the roller arm assembly to
release tension on the arm.
To increase hold-down force, move the roller forward in the slots
provided in the arm. To decrease the force, move the roller back.
C.
D.
Replace the roller arm assembly and torsion rod.
The initial opening should raise the door to 100 to 200 , where it should
stabilize itself. It should require 1 to 2 pounds of lifting force to raise the
door any further. All positions from 200 to fully open should also be stable.
If the door is unstable or if excessive force is required to open it beyond 200 ,
two friction washer screw nuts can be adjusted to correct the condition.
A.
Loosen the two screw nuts if the door resists opening.
B.
C.
Tighten the two screw nuts if the door is unstable.
If instability cannot be corrected by tightening the screw nuts, the
problem may be caused by a defective torsion rod or worn friction
washers. Replace either or both of these if such is the case.
4-36
4.11 LINKAGE LEVER - INDEX PADDLE ADJUSTMENT
The linkage lever forces the index paddle down whenever the door is opened.
This retracts the index transducer from the shroud and engages the mechanical
spindle lock. There should be a clearance of about 0.100 inch between the lever
and the paddle. This means that the index transducer assembly first begins to move
when the door is raised 1-1/4 to 3 inches. The transducer will be fully retracted
when the door reaches about 19-1/2 inches. Deform the index paddle to achieve
the correct clearance.
*CAUTION*
Support the transducer block when bending the
paddle upward to prevent indentation of the radial
adjustment ramp.
4-37
4.12 DETENT PAWL REPLACEMENT
Whenever either detent pawl requires replacement, all of the following items
must be replaced:
A.
Pivot block assembly (PiN 200330)
B.
Lower detent pawl (PiN 200243)
C.
Upper detent pawl (PiN 200242)
D.
Bowed detent washer (PiN 200331)
E.
Retaining clip (PiN 110814)
*NOTE*
These items are considered a single assembly and
must be replaced as an assembly.
4. 12. 1 Detent Assembly Removal
A.
Turn main power switch 81, located on interior control panel, off.
B.
Remove both top covers, disc pack (if any) and shroud.
C.
Remove both detent extension springs from the detent pawls.
D.
Press down on the center of the retaining clip and slip it off. Then
lift off the bowed washer, both detent pawls and the pivot block
assembly.
E.
Clean the rack and pivot block area with isopropyl alcohol (PiN 110939).
Be sure all magnetized particles are removed from the'rack teeth.
Relubricate the rack teeth sparingly with a light grease. ,
4. 12. 2 Detent Assembly Installation
A.
Install a new pivot block assemtrly; tighten cap screws securely.
B.
Lubricate sparingly the top surface of the block, the entire pivot pin,
and the sliding surfaces of both detent pawls (lower and upper) with a
light grease.
C.
Install the lower detent pawl on the pivot block first, then the upper
pawl.
*NOTE*
The lower pawl is distinguished by the two raised
surfaces near the pivot pin hole. This area is not
raised on the upper pawl.
D.
Insert the detent guide pin tool (PiN 200541) into the pivot block pin.
4-38
E.
Slide the bowed washer over the guide pin with the bowed center of
the washer up.
F.
Place the retaining ring over the guide pin.
G.
Secure the detent pawls by placing the detent cover tool (PiN 200542)
over the guide pin with the recessed side down. Then force the
retaining ring over the pivot pin.
H.
When the retaining ring is securely clipped to the pivot pin, remove
the cover tool and the guide pin tool.
I.
Wipe any excess grease from the detent pawl assembly.
J.
Attach the two extension springs to the two pawls.
*NOTE*
If there is not enough clearance between the groove
ends of the detent pawls for the springs, the upper
and lower pawls are reversed. See NOTE following
step 4.10.2 C.
K.
Check cylinder transducer alignment (section 4. 5) and head
alignment (section 4. 3).
4-39
-------_._--
4.13 CARRIAGE REPLACEMENT
A.
Disconnect the tachometer leads at the connector located behind the
operator control panel and the leads connected to the flex strips on the
bobbin.
B.
Remove the shroud and heads.
C.
Remove the three screws which hold the T-bar to the bobbin.
D.
Unscrew the tachometer rod from the back of the T-bar.
E.
Remove the cap from the rear of the linear motor and pull the
tachometer assembly (coil and rod) out of the motor by gently pulling
on the tachometer leads. Set the tachometer assembly away from the
linear motor.
F.
Remove the left side panel from the drive to expose one of the screws
which hold the linear motor in place.
G.
Remove that screw and the two other screws located under the base
plate and lift the motor off the dri ve.
H.
Slide the carriage and T-bar back off the carriage way. When the carriage leaves the way, the spring . .:1oaded bearing will drop off the spring.
I.
Hold the bearing in place on the new carriage and slide that carriage
onto the way.
J.
Set the linear motor back on the base plate and slide it up against the
back of the carriage way. See that the motor also fits firmly against
the side alignment bar fixed to the base plate.
K.
When the motor is securely positioned against the back of the way and
the side alignment bar, it is properly aligned with the spindle. Replace
the three screws which fasten the motor to the base plate. Use caution
so that the motor does not move out of alignment.
L.
Replace the tachometer assembly and cap.
M.
Slide the T-bar back against the bobbin to align the carriage and screw
the tachometer rod into the back of the T-bar.
N.
Insert your fingers into the motor and press against the side of the
bobbin in various places. The bobbin should give, indicating that it is
not up against the core.
O.
Check the alignment and clearance of the cylinder transducer and adjust
it if necessary.
4-40
-1. H
PREVENTIVE MAINTENANCE
The following maintenance operations should be performed at the indicated
intervals to assure reliable operation of the drive. Preventive maintenance should be limited to these routines as long as the drive is functioning
normally.
Procedure
Period
30 days
•
Clean the face of the detent rack with a soft
bristle brush dampened with 90 1ft isopropyl
alcohol.
30 days
•
Apply a small dab of grease on the flat surface of both detent pawls where the actuator
push rod makes contact.
30 days
•
Inspect head shoe and disc surfaces for
damage or contamination. These should
only be cleaned when contamination (such
as oxide deposit on the head shoe) is likely
to cause read or write errors or the headfl
to crash. The cleaning procedure is
described below.
30 days
•
Inspect pack filter and main blowel' filters
and'replace when dirty.
30 days
•
Apply a drop of No. 10 oil in the top of the
spindle to ensure easy removal of disc packs.
*-----*
60 day::;
•
Appl~' tW() drops of No. 10 oil between the
detent pawls.
60 days
•
Place a drop of No. 10 oi 1 hctwl'en the
washer and pawl of the mechanial spindle
brake. Compress the spring on the brake
spindle to separate the washer and pawl.
6 months
•
Clean the carriage way with a Kimwipe
dampened with 90':; isopropyl alcohol and
wipe dry. Then apply a light coat of No. 10
(PSC Part No. 200824) oil on the carriage
way (under the rolln·fl).
If head shoe and dise surfaces need cleaning, the following routine should
be performed.
4-41
A.
Remove the shroud area top cover, the disc pack, and the shroud. Turn
the main power switch (located on the Interior Control Panel) to the off
position.
B.
Move the carriage out by hand until the load/unload ramp is just at the
point of riding off the cam. Do not load the heads, or serious damage
will result to the bearing surfaces of the read/write elements.
C.
Wrap a Kimwipe tissue around a head paddle (a wooden tongue depressor
will do) and dampen (do not soak) ohe end of it with 91% isopropyl alcohol
(9% distilled water). Wipe the bearing surface of each head thoroughly
with the dampened end of the paddle, push the paddle further into the
assembly and use the dry portion of the Kimwipe to dry the surface of the
head.
Remove the paddle by pushing it toward the center of the carriage
until it is clear of the cleaned head and then pull it out.
This technique
will prevent the dampened portion of the Kimwipe from contacting the
cleaned surface of the head.
It is extremely important that the surface of the head be dried immediately
after cleaning with alcohol to prevent evaporation which will result in a
residue on the bearing surface.
D.
After all contaminated heads have been cleaned, check the flexures and
arm assemblies for loose pieces of Kimwipe tissue.
E.
Return the carriage to the retracted position and inspect the gimbal
flexures and arms for broken welds.
F.
Replace the shroud and disc pack.
4-42
Replace any defective assemblies.
SECTION 5.0
INSTALLATION PROCEDURES
5.1 GENERAL
The following information is provided as a guide to personnel responsible
for installing a Model 630 drive. It outlines some basic procedures which should
bring the drive on line in as short a time as is practical.
These procedures are
not intended as a substitute for whatever standard practice the customer may have
for equipment installation.
5.2 UNCRATING AND INSPECTION
A.
Examine the packing crate. If there is any damage to the crate, note
the damage on the freight bill before releasing the unit from the carrier.
B.
Remove the steel bands from around the top and bottom of the cardboard
packing crate.
*CAUTION*
Be careful when cutting these bands; they can spring
back and cause injury to anyone standing near the
crate.
C.
Remove the top and side cardboard covers.
D.
Cut the nylon bands around the machine.
E.
Remove the floater (cardboard box on top of the machine).
The instruc-
tion manuals and kick panels are inside this box.
F.
Remove the plastic cover and packing material from around the machine.
G.
Pull off the front and rear panels from the machine.
Pull each panel
toward you from the top; they are held by magnetic clips.
5-1
H.
Remove the machine from the bottom packing cover.
Exercise care,
as the weight of the equipment is between 295 and 325 pounds; depending
on the model.
I.
Install the two rear caster locks.
To do this, turn the rear casters so
that they face front to rear (rollers positioned nearest to the outside of
the cabinet), and use the screws provided to secure the locks to the
bottom of the main frame from inside the cabinet.
J.
Remove the cardboard supporting block from beneath the power supply
chassis (left-hand door in the back of the machine).
K.
Remove the two top covers.
Lift them from the front; the clips holding
the backs will automatically release.
L.
Remove the tape that straps the carriage to the linear motor.
M.
Remove the wooden blocks from around the deck plate.
N.
Remove the sheet metal cable entrance cover so that the cables can be
routed through the cable hole (in the bottom of the machine) to the cable
connectors.
O.
Examine the interior and top deck plate of the machine. If any damage
is discovered, notify the carrier.
P.
Check to be certain that all printed circuit boards are secure in their
connectors.
Q.
Check to be certain that the head plugs are connected to the connectors
on the Read/Write Amplifier boards.
R.
Clean the heads (some dirt might have accumulated during shipment).
Refer to Section 4. 14 of this manual for instructions on cleaning
heads.
5-2
5.3 ENVIRONMENT
The disc pack drive should be placed so that there is a 3 foot clearance at
both the front and rear of the machine.
rear panels for maintenance.
This allows room to remove the front and
Refer to Figure 2-3.
The room temperature range
should be between 60° F and 90° F with temperature changes less than 15° F per hour.
5.4 INSTALLATION
A Memorex Model 120 Off-Line Tester and a CE alignment pack (yellow
shield, IBM PiN 2200018) are needed to properly perform the necessary operational
checks on the drive.
A.
To prepare the drive for operation, proceed as follows:
Check to be certain the power switch, S1, on the interior control panel,
is in the OFF (down) position.
Then connect the primary ac power
cable (all cables are shipped in a separate carton) between the AC IN
connector, J1 on the interior control panel and the controller.
*NOTE*
Because the disc drive has ground currents in excess
of 5. 0 milliamperes, the controller, or control unit
to which these drives are connected, must have electrical grounding that contains the following:
a.
An insulated grounding conductor that is identical
to the grounded and ungrounded branch-circuit supply conductors except that it is finished to show a
green color or green with a yellow stripe is to be
installed as part of the branch circuit that supplies
the unit or system.
b.
The grounding conductor mentioned in item.!! is to
be grounded at the service equipment.
c.
The attachment-plug receptacles in the vicinity of
the unit or system are all to be of a grounding type,
and the grounding conductors serving these receptacles
are to be connected to the grounding conductor that
serves the uni t or system.
5-3
If the drive is part of a string of drives, the second and subsequent
drives in the string receive their power via the AC OUT connector,
J2, on the previous drive. All cables which are connected to the drive
must enter the machine through the cable hole in the bottom of the
machine.
*NOTE*
The maximum three phase current which may be
fed through the ac connections on any dri ve to
power it and succeeding drives in the string is
26.0 amps per phase.
B.
Check to be certain that the switches on the operator control panel ave
all down.
C.
Install the CE pack on the drive.
Move the carriage out by hand a short
distance to check that the heads will not hit the edges of the discs.
*NOTE*
This procedure is included as a precaution against
attempting to perform a first seek with heads which
might be out of line as a result of damage during
shipment.
D.
Connect the Model 120 Off- Line Tester to the dri ve as instructed in
the Model 120 instruction manual.
E.
Turn the main power switch, Sl, ON.
power supply cooling fan will come on.
The main blower and the
Examine the machine for
any signs of component overheating.
F.
Select START with the START-STOP switch on the operator control
panel. The disc pack will begin rotating.
Following a pack tem-
perature stabilization delay of 60 seconds, the heads will move
out to the forward stop and then perform a reverse seek to
cylinder 000.
If any head chattering (the sound the heads make
when they come in contact with the disc) occurs, power down
immediately by selecting STOP.
5-4
Head chattering means that
either a head(s) or disc pack is damaged. If no head chattering occurs,
proceed with the installation check out.
G.
Check head alignment as described in Section 4.3
H.
Check the index transducer circumferential alignment.
The procedure
for this check can be found in Section 4.4.
I.
Use the off-line tester to perform random seeks in the AUTOCYCLE
mode for 10 minutes.
Then seek to cylinder 000.
Verify that the car-
riage is at cylinder 000 by checking the cylinder scale on top of the
Tee-block.
J.
Select STOP with the START-STOP switch.
Make certain that the disc
pack comes to a complete stop in 10 to 15 seconds after STOP has been
selected.
K.
This verifies that dynamic braking is working properly.
Attach the kick panels to the bottom of the machine with the clips which
are already mounted.
Replace the two top covers.
pack cover (right hand) is closed while installing it.
Be sure the disc
Otherwise, the
door-open interlock arm may not properly engage the paddle on the
index transducer.
L.
Select START with the START-STOP switch.
When the disc pack motor
comes up to speed, open the disc pack cover door.
When it is open
about 1 inch, the heads should retract and the motor should shut off.
Dynamic braking is not applied in this case, so the disc pack will coast
slowly to a stop.
M.
Close the disc pack cover door.
Use the off-line tester to make a quick write/read check.
1.
Select READ/WRITE with the READ/WRITE- READ ONLY switch.
2.
Write all ONEs with any head on cylinders 000 and 128.
*CAUTION*
Use only these cylinders for this operation. Valuable infoI'mation
is permanently stored on other cylinders of the CE pack.
3.
Select the READ mode.
Monitor the output of the Read Amplifier,
A10, by connecting an oscilloscope to pin 4 of A10.
4.
The double frequency (2F) pulses observed on the oscilloscope
should be at a 2.5 MHz rate.
5-5
5.
Write all ZEROs with the same head on cylinders 000 and 128.
The single frequency pulses (IF) should be at a 1. 25 MHz rate.
6.
N.
Disconnect the oscilloscope.
Select STOP with the START-STOP switch, turn the main power switch,
SI, OFF and disconnect the Model 120 off-line tester.
0.
Connect the controller's Bus cable to the BUS IN connector J3 on the
interior control panel of the drive. If the drive is not the first drive in
a string of drives, connect the cable that comes from the BIs Out connector, J4, of the previous drive to the BIs In connector, J3.
P.
If the drive is the only drive or the last drive in a string of drives, plug
a line terminator assembly into the Bus Out connector, J4.
Q.
Connect the proper Unit cable from the controller to the Unit connector,
J5, on the interior control panel.
The controller has a separate Unit
cable for each drive.
R.
When all cables are connected, replace the sheet metal cable entrance cover.
S.
Turn the main power switch, SI, ON and then replace the front and
rear panel s.
T.
If the drive is part of a string of drives (but not the last drive) it
should be checked for proper power up sequencing. To do this, first
make certain a disc pack is on the drive and the disc pack cover is
closed.
Leave the drive's START-STOP switch in the STOP position.
Place the next drive's START-STOP switch in the START position. In
a power up sequence from the controller, the drive under test will not
come on; it will be bypassed and the next drive in the string will turn on.
U.
To make certain that the next drive turns on when the drive being
installed comes up to speed, place the START-STOP switch on both
drives in the START position.
Power up from the controller and
observe the first drive come up to speed (70% of spindle drive motor
speed). At this time, the spindle dri ve motor on the second dri ve
should begin rotating.
V.
As the last step in the installation check, select STOP with the STARTSTOP switch.
5-6
LOGIC DESCRIPTIONS
AND
DIAGRAMS
POWER UP SEQUENCE AND INTERLOCKS
POWER SEQUENCING
INTERLOCKS
The purpose of a power sequencing scheme is to prevent simultaneous starting of all the
drives in a multiple drive system. This could happen If all START-STOP switches on the
drives were in the START position and no sequencing control were provided. In starting, the
oontroller would attempt to power up all the drives at once and the lines would be overloaded.
(The drives draw approximately six times as much startup current as running current. ) Power
sequenciDg avoids overloading by requirlDg that a drive reach approximately 70% of full speed
before the next drive in line can receive Its power.
A safety interlock system Is incorporated in the drive which prevents the disc drive
motor from stsrting unless certain conditions are met.
A.
Kl must be energized.
In a normal startup of a string of drtves, each drive will have Its main power switch ~1)
on and its START-STOP switch in the START position. When the controller powers up, it supplies ac power to each drive, turning on the main cooling blower, logic card file fan and de
power supply vis a ferro-resonant transformer.
This de power supply provides +26 vde, -26 vdc, +24 vrac (volts rectified ae) and +36
vdc. Electronic regulators convert the +26 vdc to +18 and +5 vdc and the -26 vde to -18 and -3
vdc for US.J by the drive's logic. The +24 vrac is supplied by the same rectifier as the +26 vdc
but is isolated from it and bas very little filtering; it contains a high degree of ripple. Theunregulated +36 vdc is used for powering the positioning motor, providing dynamic braking power
to the drive motor, energizing the detent actuator and energizing Kl, the sequencing relay.
In a typical power-up operation, the +36 vde In the first drive in the chain will leave the
drive on J3, pin 78, go through a jumper In the controller and reenter the drive on J3, pin 77.
From there It passes through an isolation diode (CR8) and a resistor (RS) and enters the coil of
Kl. If a ground return is available through the controller via J3, pin 76, KI will energize and
the +36 vdc contributed by the dc power supply through contacts 9-6 will hold Kl energized.
This self-holding feature of Kl makes each drive independent of the previOUS drives once Kl
bas picked.
As soon as Kl in the first drive has picked, contacts 8-5 provide a ground return for the
motor relay K2. Then, If the door switch is closed, if the heads are retracted and If the
START-STOP switch is in the START position, the spindle drive motor will start (the
interlock system is described in detail in the INTERLOCKS section below). When the disc
pack reaches approximately 70% of full speed, a speed sensing system provides a ground
retnrn for the speed relay (K3), causing It to energize. This sends +36 vdc to the next
unit vis K3 contacts 8-5, Kl contacts 7-4 and the signal out cmmector J4, pin 77. This
sequencing voltage causes Kl in that· drive to pick.
If the START-STOP switch Is in the STOP position, the drive's inter~ock system
will be .bypassed. Since the spindle drive motor does not start, sequencing to the next
drive does not wait for the speed sense relay (which woold never pick). Instead, as soon
as Kl picks, +36 vdc is sent 'to the next drive through the STOP contacts of switch S2-A
and Kl contacts 7-4.
B.
The door switch must be closed; i. e., the drive's top cover is closed.
C.
The START-STOP switch must be in the START position.
D.
The heads extended-retractsd switch must be in the retracted positton.
If these five condit1ons are satisfied, a ground return is provided for motor relay K2 and
the warmup delay relay K7, which are connected in parallel. Tbe motor starts. At 70%of
foil speed, speed relay K3 energizes and removes a ground from the -retract heads circuit
by breaking contacts 7-1. The -retract heads line is also interlocked with the open contacts of
door switch S5, the STOP contacts of S2-B, and the deenergized contacts 8-2 of Kl. However.
if the interlock condit1ons listed above are met, K3 removes the last ground from the -retract
heads line.
The warmup delay relay K7 requires approximately 45 seconds of voltage to its coil before it energizes. During this interval, contacts 7-1 provide a ground for the -power up reset
line, which resets all system logic. After the warmup period, K7 energizes, and contacts 7-4
make, prOViding a ground for the -first seek enable line. This initiates a first seek. +36 vde
are supplied to the servo power amplifier via servo power relay K6, contacts 7-4 to launch the
heads. K6 will be provided a ground return via a relay driver on card C07 when the electronic
logic is complete (see below~
Once the heads are launched, one of the original interlock requirements (-heads retracted) is lost; however, S3-B is shunted in parallel by the energized contacts of K3. AB
long as K3 is energized, it is presumed to be safe to launch heads; however, if the speed
relay deenergizes during routine operation, contacts 7-1 of K3 would provide a·-retract
heads signsl, causing the heads to retract at a slow speed. This situation could be caused
by a broken drive belt, a faulty spindle drive motor or some Similar circumstance. Shoold
any of the other interlocks fail while the heads are extended, (START-STOP switch, door
switch, or sequence relay) the same -heads extended line woold be provided with a ground.
Each of these interlock failures woold cause the heads to retract and, as soon as the heads
were retracted, woold remove ground from K6, deenergizing the servo power relay. This
keeps the heads in the retracted position until the interlock sequence has been reinstated. In
addition, If the door switch or START-STOP switch are involved, motor relay K2 and warmup
relay K7 deenergize, causing the whole system to come to a halt. If the interruption in the interlock is restored (such as opening and closing the cover door) the system will go through a
normal start-up, including the warmup delay, will launch the heads again and will initiate a
first seek.
POWER UP SEQUENCE AND INTERLOCKS (coatinuedl
The clllltro11er 1Jdt1atee a power-down sequencie by dropplDg the cODtroUed grouDd for all
the K1 relays. Thta apeIIII the bu1c lDterlock, bat the by-pua arouud the orfgInal system via
the energized coatllct8 9-6 of K7 keeps the d18c motor turuJDr UDt1l the heads have been retracted. Once the clllltro11er coaflrmll that the -beads exteDded Une la clear (lndicatlug that all
driv_ have retracted their bead8) It shute off ac power.
POWER FAILURE
Power failure In tbe drive, which may he caused by loss of ac power from the coatroller,
a blown maID fuse In the drive or defective wlrIDg, requires that the heads be retracted from the
disc pack as repIdly as possible. Power failure relay K4 Is reepouelble for thIe lafety feature.
WIthSD a f_ mI1l18ecCDda after power Ie first available at the maID power switch, K4 Ie _r, ped by the +24 vrac.' The relay remaIDa energized UDtIl there Is a power failure, or power Ie
tumed off at the maID BWItoh.
When K4 deenergiZes and contacts 8-3 make, a -emergency retract slgDalle applied to
the servo power ampUfter, overrldlag any,normal command algDa18 present at the servo power
amplifier Inputs. In effect, It CJlla for full speed retract of the positioner motor. However,
slDee the lervo power relay, D, Is also beIDg d_rglzed by the 10&8 of +24 vrac, the breaklag of contacts 7-4 removes the +36 We to the power amplifier. K4 contacts 7-1 make In the
deeaerglzed position, 8\IpJIJyIDg the power amplifier with the stored _rgy In the +36 vdc system. This c _ _ the beads to retract at JII8ldmI1m speed.
Power fa1Jure ,Ie lbe 0DIy reason for head retraction at maximum speed; any other power down or Interlock lDterrapUon c_es the beads to retract at a relatively slow speed. When
t1U'IIIag a drive off, It Ie advisable to select STOP on the ST ART-8TOP swltoh before switchlDg,
off the maID power BWItoh.
DYNAMIC BRAKING
Dynam1c braId:ag of the aplDdle drive motor Ie ueed to brIDg the disc pack to a quick,
slllOCltb atop. It 1. accompl1lhed by apply1Dg +36 VIle to the ftelcl wIDdIDge of the motor; this
induces heavy current flow In the llborted armature windings In a direction and magnitude which
opposes the de field. The opposlDC fields brake the motor to a halt In about 7 seconds. The
+36 vde is applied to the motor only when the START-STOP switch Is in the STOP position; UDder any other condition, there Is DO dynamic brakiDg available.
When STOP is selected. +36 vdc is supplied to the motor VIa the back contacts of 52-A,
the deeaerglzed contacts 8-3 of time delay relay K5 and the deeDergized contacts of motor relay K2. A ground return Is -provided by the second set of deenerglzed contacts on K2. Ten
8econds after the heads have retracted, K5 energizes and cuts off dynamic braking. If the
beads are already retracted when STOP Is selected, the lO-second del8¥ begiJls immediately.
SlDee the disc drive motor represents a highly Inductive load, openIDg of contacts 8-3 of
K5 woald caue a voltap surge that woald tend to arc over these contacts. Capacitor Cl, wbfch
Is cOllllllCted acros8 the motor, dampens this voltage surge to an acceptable value (refer to scbematIQ 008027). Jf K6 ever fa1Ja to de-rrtze for some reason, lbe dynamic braIdDg current
(about 8 amp at 38 We) will not overload the power suPPly. ElItended appUcatiOll of the current
would probably create enough heat In the motor wlndfaga to activate the thermal-overload cntout
In the motor. ThIs would Interrupt the current now (refer to schematic ,008022).
SIGNAL CONDlTIONER (refer to schematic 001567)
Four of tbe 81gDalllDes orIglDatIDg In the relay switching and COIJtroi system share a commOIl problem. They Indicate some degree of llOfse, even when groundIag the circuit; the slgDal
llDes are often open (1. e •• not grounded). In order to provide soUd switching of the associated
10llc circuits, the stgual CODdItfoner _
that some of the noise Ie SUWreBsed, and that both
the I1"'JIIIIICIed and 1IDgI'000000ed Une conditions reault In soUd output logic sipla. ThIs is 1ICCODlplfahed by a poeftlve de voltage 011 the gate IDputa when the llDe is not grounded, and negative
voltage OIl the gate inputs when the llDes are grounded. Small by-pae8 capacitors render the
8ystem 1Ds_ltlve to lIhort-duntton noise palaes.
a
CONTROL TRANSLATION
The controller selects one unit out of a series by activating the select unit line to a particular unit. This line," which enters on J5, pin 23, is combined with a file safe condition to
partially enable the control translation network of a selected unit.
The control translation network input consists of eight unit hus ·lines, which all come in
on J3, and three tag lines (a fourth tag line,set differeoce, comes into J3, pin 15 but is not
used by the unit). Functions of the three tag lines, set cylinder, J3, pin 17; set head and direction, J3, pin 18 and control, J3 pin 21, are defined in detail in Section 2.3.2.2, Communication Lines. The unit bus lines are also defined in Section 2.3.2.2. Depending on which tag line
is activated, one or more bus lines will be used.
The control tag line is used to partially enable the eight unit hus lines; one of these eighi
is selected by the controller to initiate a particular function (i. e., select write, select read,
seek start, select reset head register, select erase, head select, select restore/retract and
select head advance).
The set cylinder tag line gates all eight bus lines, which contain the address of the cylinder about to be selected, into the cylinder address register (CAR).
The set head and direction tag line gates bus lines 4 through 7, which contain the address
of the head about to be selected, into the head address register. Before the head address can
be gated into the head address register, however, the register must be reset. This is done by
selecting the control tag line and bus line 3, select reset head register or as part of a first seek
or restore operation.
"
Inputs from the bus lines go only to the direct set side of the register flip-flops; this provides for a transfer of one's only rather than a forced transfer. Output of the head address
register flip-flopa goes through the head switch decoder to the head switch drivers. These are
shown in the Read/Write logic diagram.
CAR AND PRESENT ADDRESS REGISTER
CYLINDER ADDRESS REGISTER
The set outputs of this eight-bit register go to the controller through the CAR line
drivers. The reset outputs go to the adder. Input to the CAR is by forced transfer directly
from the unit bus lines.
PRESENT ADDRESS'REGISTER/COt:NTER
The eight-bit present address register/counter consists of eight ,JK flip-flops. four
of which have their direct set inputs tied down. The four not tied down allow the register
to be force set to 204. Other inputs to the register are: preset to zero. cylinder count
pulses from the cylinder transducer amplifier, and either a forward up count enable or a
reverse down count enable. The register may be reset as part of a power-up sequence or
a restore operation.
When the forward direction gating is enabled. the reverse down count enable line into
inverter B06-2B is high. The low output from 2B goes into OR gates A/BIO-2D, 4D. 6D and
8D and A/Bll-2D, 4D, 6D and SD. This clamps the output of each OR gate trying to go high.
At the same time, the forward up count enable line is low Into AND gate B06-1B and OR
gate B{)6-3A. A high out of B06-3A enables the J and K inputs to the first counter flipflop and partially enables AND gate A/BIO-2B on the set output line. The first cylinder
pulse coming to the block input of that flip-flop will set it. All other flip-flops In the counter
have low inputs. With the first flip-flop set, -the AND gate A!BIO-2B from the set output '
is satisfied. providing a low into OR gate A/BI0-2A. Since each of the two OR gates feeding
the second flip-flop has a low input. the collector AND on their outputs Is enabled; its high
output sets the J and K inputs to the second flip-flop. The next cylinder pulse into the clock
inputs will reset the first flip-flop and set the second one. Resetting the first flip-flop
disables the AND gate on its set output. This disables J and K inputs to the second flip- .
flop so that the next cylinder pulse will set the first flip-flop. Again the AND gate on its
set output is completed. The OR gates and collector AND for the J and K inputs to the
second flip-flop are high. This flip-flop is set and the AND gate on its set output provides
a low to OR gate A/BIQ-2A. High outputs from OR gates 2A and 2D satisfy the collector AND
which sets the next flip-flop (No.4). The fourth cylinder pulse resets the first two flipflops and sets the third. This process continues. increasing the present address register's
contents; a reverse direction enable causes a similar sequence.
Power up and restore sequences first preset the present address register/counter
to zero. This is maintained during theSOO ms forward travel. Following this delay, a
count of 204 is loaded into the register., A power down sequence clears the counter • Reier
to the Access Control logic diagram (200615) description for power up and restore details.
ADDER
The adder is made up of eight full-add Ie modules. Each module combines two bits
and a carry and gives an inverted carry out and sum out. The inverted carry is supplied
by the adder module. To get a complete sum, inputs to every other adder module must be
inverted. Since each module sends out an inverted carry. different pins are used on each
module for inverting signals. For clarification, refer to the adder schematic (001197).
This shows the pin configuration on each adder module.
Forward and reverse gate outputs are brought to an OR gate. The output of the OR
gate goes to an output pin on the adder board and through an inverter to another output pin.
In each case, the two outputs are labeled true and not. The true outputs (I, 2, 4, 8, etc.)
are not used. The not outputs (T, 2, 4. 8, etc.) go to the speed decode network. With a
forward gate enable, the true output of each adder module goes to the speed decode; with
a reverse gate enable, the inverted output of the adder modules goes to the speed decode.
All inputs, with the exception of -force difference
+forward (sent from seek forward/reverse logic), come
ter and present address register/counter. In a compare
module has for one input a logical zero and for the other
The input +forward is high during controller-instructed seeks as dictated by the
logic in the carry line in A24. This input is low at all other times (except during the
reverse portion of the power up or restore sequences).
(sent from home seek logic) and
from the cylinder address regis(detent condition), each adder
a logical one.
The carry line is called an end around carry; it is connected back from bit 128 to
the carry input of bit L It also goes out to seek gating as the direction carry. When the
carry line is high. a reverse seek is indicated.
The output of each adder is sent to two AND gates; it goes to one directly and to the
other through an inverter. The one set of AND gates is enabled by the +reverse line which
comes from the carry output of bit 128 adder module. The other set of AND gates is enabled
by +forward which comes from seek gating.
During forward travel in a power up or restore sequence and during reverse travel
in power down, a collector OR tied to A/BI2- EE forces'4 of the adder low, while all other
outputs are high. This low output forces a difference count of 4 into the speed decode
network, At this time, +reverse into A/BI2-KK is high.
FORWARD/REVERSE SPEED DECODE AND SERVO
SPEED DECODE NETWORK
The Speed Decode Network is responsible for converting the output of the adder (i. e. ,
the number of cylinders required for positioning the heads during a seek) into a drive current
input to the servo -amplifier. Input lines from the adder to the speed decode network are gated
by a forward or reverse enable. Refer to the Adder logic diagram, 200612.
Forward and reverse operations are performed by separate decode sections. This
is necessary because the motor has more force in the reverse direction. The same eight
input lines from the adder feed both sections. Forward and reverse speed decode enable
fines (one each) select which section will use the input. The eight inputs from the adder
also go to an OR gate with expander inputs. Its output is labeled--compare.
At the beginning of a seek, when the detent is engaged and when the contents of the CAR
and the present address register/counter agree (no output from the adder), the following two
conditions exist:
A.
The forward and reverse gating lines to the adder output are both low.
B.
Inputs to the speed decode network are all high.
With all inputs to the speed decode OR gates high, these OR gates will supply low inputs to
their AND gates. The AND gates, in turn, will produce a high output (+5 volts) which provides
zero drive to the servo amplifier. The high condition of the eight adder output lines does satisfy the requirements of the compare OR gate. however. Its output is low and is labeled
-compare. The -compare line is connected to pin P on the speed decode board and enables
inverter A/B 15-4B. The high output of 4B partially enables AND gate 3A. The output of 3A
does not go low when the detent is engaged. however. because the other input line. labeled
+detent speed enable is not high. If AND gate 3A were enabled and its output did go low it
would provide detent velocity to the servo amplifier.
/
When a seek is initiated by gating a new address into the CAH. some of the adder output
lines will go low. indicating the number of cylinders required for positioning. Assuming that
the positioning requires a forward seek of greater than 64 cylinders. the true output of the
adder is gated to the speed decode network. A +forward speed decode enable is generated by
the detent logic and partially enables the AND gates of the forward section of the speed decode
network (9D through 3C). Because the seek is greater than 64 cylinders. at least one input
from the adder to the first two OR gates. 9C and 2A. is low. This low input forces the output
of the gates to go high. The high outputs complete AND gates 9D and ID so that their outputs go
low. The low outputs of gates 9D and ID turn on their diodes. supplying current to the servo
amplifier. This low out of ID also serves as the input to OR gate 2C. The low input to 2C
forces a high output. satisfying the third AND gate. IC. Its low output forces the output of
OR gate 2B to go high. satisfying AND gate lB. This continues down the line until all seven
pairs of OR gates and AND gates in the forward section of the speed decode logic are activated.
In each case, the active outputs of the AND gates cause the diodes on their output lines to be
biased on and conducting. The current on all seven output lines is summed and provides maximum current to the servo amplifier.
As soon as the output from the adder indicates that there are fewer than 64 cylinders left
for positioning, all inputs to gates 9C and 2A go high. causing their outputs to go low. The lows
into AND gates 9D and ID detent speed enable signal 80 that enough
forward current is supplied to the motor to maintatn a 1. 5 ips forward velocity. This is the
carriage velocity at which the detent pawl engages with the detent rack. Detent velocity current lasts for approximately 3 ms. When the detent drops in, 'Ielocity drops on a straight line
to zero.
When the speed decode network determines that there are fewer than 6{ cylinders to go.
the desired velocity becomes less than the actual velocity. Excess negative feedback provides
the amplifier with reverse voltage input. Motor current builds up in the reverse direction at
a sharper rate than in the forward direction because back emf is now assisting the power supply (see B on the current level curve in the following sketch). As the current increases, the
armature and carriage decelerate sharply; negative feedback drops off.
COAST
><
!::
80 ips
u
I I II
I I II
I I II
II I I
I 1\ I
I I I
0
~
f,l
>
fool
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II
I I
I
I II
I I II
,I
f--.....
EMERGENCY RETRACT
Al8o{, (pADDLE BOARD)
K6
P/JII-3 C2 DRED
7
SERVO
PWR
+3(, VDC
C03-N
lOUF
330VAC
r
I
":'O~ROLLER
CONTROL LED
GROUND
1651
I· I
,
t!J
Til
+ UP
SPEED
FROM A23-N 20061&
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~.
I
LA'>-o I
R 5-1
K:3
RED B TI
.:'HEADS:=J
EXTENDED'
J... I
L ___=.-J
P/J3
SIGNAL IN
FIRST
SEEK
--iie..Jl
OR .........T·"""·
I", I____
.. ~~-HEA OS
.. ___ .' .. EX TENDED
~
I
RETRACT+ -SLOW REVERSE
o
HEADS
2
CI0-6,CI4-L
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200615
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I. 1 +3V
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"'0
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TO NEXT DRIVE
7
...-_ _ _+1...
- POWER UP
I1ESE T C09-M, CIO-L
:.o
-
200615
1
I
.-+____+16;;.:4>+ HEADS EXTENDED
1
177 I
z:
GROUND FROM
NEXT DRIVE
P/J4 SIG. OUT
200609
SEQUENCE
TO NEXT
UNIT
POWER UP SEQUENCE AND INTERLOCKS
PADDlE BOARD
r
~3
TP3
cn
811~C_~~ _ _ _ _
r-------------,
128
o
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A06-0,CI3-D tOOl18
TP4
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+SELECTED READ GATE
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K - SELECTE 0 RESTORE
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BZ4-N,COB-C,CII-E,CIZ-M
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R -RESET ATTENTION
TO CIO-D 200615
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II
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C - SEL ECTEn SET
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------
C06 - Q
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L_,
IL ___________
HEA D SWITCH DECODER .JI
2.q)(;.,9
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A06
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~ - SET CYLINDER TO CII-B
Z00619
~A06~
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~
24
+ SELECTED
r-.£~--'
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~
BUS 3
CI8-L 200610
......---t--.... ~ci6I~
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C28 L ______ ...l
- ~
200615
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OPTIONAL
REVENUE METER
co
l
bK....K•I_ _.BI8_H
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:
I
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22 UNIT
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10
TP4
IE
21
~3 SET
15 otFFERE
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~
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----
+ SELECTED CONTROL
I
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12 P
14 BB
I
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....~
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-- ---- -
B
IB
18 AND DIRECTION
'I!
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17
....
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I
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:z:
u
i
=:.J
CONTROL . -__
TP3
+SELECT UNIT
.. CII-R
200619
FOR IIFORMATIOI
OILY
200610
CONTROL TRANSLATION
TO CYLINOER
AOORESS REGISTER'
-lLINE OR IVERS
1200619
+UNIT BUS 7
C20-N
200610
I
I
I
I
I
I
I
1
I
-SELECTEO SET
CYLINDER
FRO" CI6-C
.! _________t.!_JI
200610
+RESET CYLINDER REGISTER
FAOM CIO-K 200615
2"
TO ADDER AI2-C
TO
TO
AI2-L
ii
BI2- ....
TO
TO
AI5-C
iii
813-6G
TO 815- ....
INPUTS TO ADDER
200612
PAOOLE 80ARD
B27-A
821-8
8 TO AI2-Q
827-0
827-C
821-E
TPI
LAMP
DRIVER
DRIVER
8Z7-F
B27-6
121 TO 813-Q
821-H
Q
N
TP2
LAMP
64 TO 1113-F
32 TO AI3-.
16 TO A13-8
,E
C
A08
4 TO AI2-F
2 TO AI2-.
I TO A12-8
TP3
LAMP
ORIVER
AOI
A08
D
TP4
TP$
L .... P
DRIVER
TPI
LAMP
DRIVER
AOI
LAMP
DRIVER
AOI
G
E
-J
.68V
=
T
0;
IUF
s>11K
I
i
(A2';-0)
200616
TACHOMETER
i-I
DO
1113
1
L __ __
.. "'".J
FORWARD/REVERSE SPEED
!
DE~
IL_.J
~lh
(LOCATED INSIDE
t.tDTOR ON TOP
DECK PlATE)
(-COMPARE)
(A24- E)
200615
470
FOR IIFORMATIOI
OILY
#'1476
9O.9K
I
-
A2l
t
-6BV
-IBV
TACHOMETER AMPlIFI ER
~K
-IBV
13.7K
TP3
(001436_1_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ I l l L
I
---l1
FORWARD/ REVERSE SPEED DECODE AND SERVO
(B24EH-FORCE COUNT~ A05H
200615
200616
1----------------,
T~2
:
6vL
0
2B
IUF
h
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.
I
CARD FILE
SIDE PAMEL
,--,
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I
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. -__~~2~Af
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A04-M
(+SEEK
ENABLE)
200615
~~~~~5RSEl.
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A22-H 200613 IK
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VELOCITY
A04-N
(+K6 DRIVE
200615
r---------------,
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,
'A26
ACTUATOR
LOGIC AND
DRIVER
~001546)
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200614
•
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IN4756'
48V
5
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200613
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DETENT LOGIC n _
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•
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r-l
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1
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(+FORWARD
TO SERVO) •
200615
I I
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200613
I I
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FOR INFORMATlON
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-,
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15e736
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NOTES: UNLESS OTHERWISE SPECIFIED
D
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UNLESS
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REFLECT THE LATEST ENGINEERING CHANGE
NUMBER
2. COMPONENT HEIGHT NOT TO EXCEED .350
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2
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3 PLACE DEC ±-
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DOCUMENTS
SCH. DIAG.
ARTMASTER
001132
001133
FABRICATION
001134
EC
LEVEL
34
580
580
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•
subsidhr, of MEMOREX CORPORATION
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DATE
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SEE BIM INO. 001/91 I
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5CH. DIAG.
DOCUMENTS
1001192
ARTMASTER
FABRICATION
1001193
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LEVEL
~:1
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58':
Peripheral Systems Corporation
subsidiary of MEMOREX CORPORATIOtt
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+IBV
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NO·1
DATE
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TECHNICAL APPROVAL
(BALANCE)
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I '"
[f;';{]~[f;';{]®ffiHE~ EQUIPMENT
NAME
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REF
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PART NO.
I nOl439
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CI
CAMCllOR T 4.7UF 10V + 10'10
T 2_2UF.35V
10'10
·C~.3
C •. OIUF 2SV,+20%
C6.B.9 -,10.11.,3 J
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P, .0IUF; 50V,+10'1o
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CR3
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151600
151507
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100 OHMS II'3W + I '10
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MF, 5.IIK, IIBW, + 1'10
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153040
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B.2K,1/4W, +5'10
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OJ
2.
ENGINEERING CHANGE TAG (200304) MUST REFLECT
THE LATEST ENGINEERING CHANGE NUMBER
COMPONENT HEIGHT NOT TO EXCEED .350
3·
GI, AI THRU A3 HEIGHT NOT TO EXCEED. 330.
REFEREiNCE DOCUMENTS
'."'f''''
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CAPACITOR T 4.7UF 10V :':10%
CI
, C2.3
T 2.2UF.35V±IO%
C, .01 UF 25V ±20%
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M 33PF 500V.+5%
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C4
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151124
151127
150971
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AI 2'3
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RI. 2
IOK,II4 W. ±Ii %
R31316
23
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R21
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R6
4.7K 1/4W +5%
R22
5.6K 114W + 5%
R29
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R5
IK,II4W + 5%
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19.1 K,II8W ± 1"/0
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R25,27
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R8
150645
151600
151507
153207
152963
153086
153105
153223
153409
153040
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150374
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PART NO.
1001439
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DATE iCHANGE NOi DATE CHANGE NO
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c
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II]
ENGINEERING CHANGE TAG (200304) MUST REFLECT
THE LATEST ENGINEERING CHANGE NUMBER
'2.' O·OMPONENT HEIGHT' NOT TO-EXCEED .350
3.
REFERENCE DOCUMENTS
SCH.DIAG,
ART MASTER
FABRICATION
TEST SPEC .
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