List of Illustrations
Model 4145A
LIST OF ILLUSTRATIONS
Number
5-14.
5-15.
5-16.
5-17.
5-18.
5-19.
5-20.
5-21.
5-22.
5-23.
5-24.
5-25.
5-26.
5-27.
5-28.
5-29.
5-30.
5-31.
5-32.
5-33.
5-34.
5-35.
5-36.
5-37.
5-38.
5-39.
5-40.
6-l.
Title
Page Number
D-A Converter Gain Adjustment
Setup . . . . . . . . . . . . . . . . . . . . . . . 5-16
Check/Adjustment Point
Locations . . . . . . . . . . . . . . . . . . . 5-17
Results from LED Annunciators . . 5-18
Check/Adjustment Point
Locations
l
. . . . . . . . . . . . . . . . . . 5-19
Vm Range Adjustment Setup . . . . . . 5-20
Test Point Locations . . . . . . . . . . . 5-22
Flexible-disc Drive Access .,... 5-23
Component Locations for MSU
DIAGNOSTICS Mode Setting . . . . 5-25
CRT Display of MSU DIAGNOSTICS
Page . . . . . . . . . . . . . . . . . . . . . . . .
5-25
CRT Display of MSU Read Test . . . 5-26
CRT Display of MSU Write Test . . 5-28
CRT Display fo MSU EXERCISER
Page . . . . . . . . . . . . . . . . . . . . . . . . 5-30
Drive Belt Tension Check and
Adjustment Setup . . . . . . . . . . . .
5-32
Index Timing Checks and
Adjustment . . . . . . . . . . . . . . . . . . 5-33
R47 Location . . . . . . . . . . . . . . . . . . . 5-33
Track Alignment Check and
Adjustment . . . . . . . . . . . . . . . . . . 5-34
Scope Display of Bursts ^l....... 5-35
Check/Adjustment Point Locations 5-37
Track Zero Switch and Adjustment
Setup . . . . . . . . . . . . . . . . . . . . . . . 5-38
Scope Display of Track Zero
Switch Switching
. . . . . . . . . . . . 5-39
Check/Adjustment Point Locations 5-40
Jitter Check and Adjustment
Setup . . . . . . . . . . . . . . . . . . . . . . . 5-41
Scope Display of Jitter . . . . . . . . 5-42
Check/Adjustment Point Locations 5-42
Index Detector Alignment Check
and Adjustment Setup . . . . . . . . 5-43
Index Detector Alignment Gap . . . 5-44
Check/Adjustment Point Locations 5-45
Major Mechanical Parts
(Exploded View) ..,...,,...., 6-29
8-l.
8-2.
8-3.
8-4.
8-5.
8-6.
8-7.
8-8.
8-9.
8-10.
8-11.
8-12.
8-13.
8-14.
8-15.
8-16.
8-17.
8-18.
8-19.
8-20.
8-21.
8-22.
8-23.
8-24.
8-25.
8-26.
8-27.
8-28.
8-29.
8-30.
8-31.
8-32.
8-33.
8-34.
8-35.
Title
-- .&
Page
Four Major Sections of the 4145A 8-3
Overall Block Diagram .......... 8-5
Assembly Level Trouble Isolation
Flow Diagram
................ 8-7
Assembly Locations ............. 8-8
Front Panel Removal ............
8-9
1345A Removal .................. 8-10
Rear Assembly A Removal ........ 8-11
All and A12 Board Removal
...... 8-12
Rear Assembly B Removal ........ 8-12
A19 Board Assembly
.............
8-13
FDD and A9 Board Removal ....... 8-13
Flow Diagram Notes ............. 8-14
Signature Analysis .............
8-21
Al Board Troubleshooting
Flow Diagram ................ 8-25
A2 Board Troubleshooting
Folw Diagram ................
8-31
A3 Board Troubleshooting
Flow Diagram ................ 8-43
A4 Board Troubleshooting
Folw Diagram
................ 8-53
A9 Board Troubleshooting
Flow Diagram ................ 8-59
A10 Board Troubleshooting
Flow Diagram ................ 8-65
Schematic Diagram Note .........
8-68
Block Diagram of Al Board ...... 8-69
Al Graphic Display Control Board
Assembly Component Locations. 8-70
Al Graphic Display Control Board
Assembly Schematic Diagram . . 8-71
Block Diagram of the A2 Board . . 8-72
A2 Microprocessor Digital
Control Board Assembly
Component Locations
......... 8-74
A2 Microprocessor Digital
Control Board Assembly
Schematic Diagram ...........
8-75
Block Diagram of the.A3 Board . . 8-78
A3 SMU Control and A-D Converter
Board Assembly Component
Locations ................... 8-80
A3 SMU Control and A-D Converter
.Board Assembly Schematic
Diagram ..................... 8-81
Block Diagram of A4 Board ...... 8-84
I-V Converter Output ........... 8-85
Analog Switch
.................. 8-85
A4 D-A Converter Board Assembly
Component Locations .........
8-86
A4 D-A Converter Board Assembly
Schematic Diagram ...........
8-87
A5 Board Troubleshooting
Flow Diagram ................ 8-88
vi
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