IBM System/32 Reference manual

· / ( (
(
(
\
-
-
- ---
- --
---.. -~-
---
-- ------
- ----
===~== ~ =Maintenance Library
SYSTEM/3~
Introduction and Maintenance
SY31-0373-4

PREFACE
This manual contains introductory and maintenance
information, and installation instructions for
IBM System/32. The maintenance information
includes checks, adjustments, and removals and
replacements.
Other manuals to be used with this one are:
• IBM System/32 Operator's Guide, GC21-7591
• IBM Diskette For Standard Data Interchange,
GA21-9182
• IBM System/32 Functions Reference Manual,
GA21-9176
• IBM System/32 System ControlProgram
Reference Manual, GC21-7593
For theory of operation and circuit detail, see
IBM Maintenance Library, System/32 Theory
Diagrams,
SY31-0346.
In addition, refer to the System/32 Diagnostic
User's Service Guide for further information on
system diagnostic procedures.
Fifth Edition (May 1977)
This is a major revision of, and obsoletes, SY31-0373-3. Extensive changes have been
made throughout, and this publication should be reviewed in its entirety. Changes are
periodically made to the information herein; any such change will be reported in sub-
sequent revisions or technical newsletters.
A Reader's Comment Form is at the back of this publication. If the form is gone,
address your comments to IBM Corporation, Publications, Department 245, Rochester,
Minnesota 55901.
©Copyright International Business Machines Corporation 1975,1976,1977

CONTENTS
LIST OF ABBREVIATIONS.
xi 2.1.15 Write Safety
2-7
Data Unsafe Conditions
2-7
CE SAFETY PRACTICES. xiii File
Ready.
2-7
Disk Speed.
2-7
1.0.0 INTRODUCTION 1-1
Power Up
2-7
1.1.0 DESCRIPTION
1-1
2.1.16
Seek Operation 2-8
1.2.0 BASIC CONFIGURATION 1-2 2.1.17 Recalibrate Operation 2-8
1.3.0 SYSTEM
DATA FLOW 1-3 2.1.18 Behind Home . 2-8
1.4.0 PROCESSING
UNIT DATA FLOW 1-4 2.1.19
Servo Track Following . 2-9
1.5.0
CHANNEL DATA FLOW.
1-5 2.2.0
MAl NTENANCE . 2-10
1.6.0 SYSTEM MICROPROGRAM. 1-6 2.2.1 Card Sockets 2-10
1.7.0 CONTROL
STORAGE.
1-7 2.2.2 Disk Enclosure (DE) 2-12
1.8.0
FUNCTIONAL UNITS. 1-8 2.2.3 Disk Drive Motor 2-14
1.8.1 Main Storage
(MS) 1-8 2.2.3.1 Old Style Motor 2-14
1.8.2 Control Storage
(CS)
1-8 2.2.3.2 New Style Motor . 2-16
1.'8.3 Storage Address Register (SAR) . 1-8 2.2.3.3 Motor Start Relay 2-16.2
1.8.4 Micro Operation Register
(MaR) 1-8 2.2.4 Brake Assembly
and Brake Coil
1.8.5
Process Condition Register (PCR) 1-8
Assembly.
2-16.4
1.8.6 Storage Data Register
(SD R) . 1-8 2.2.5 Brake Assembly 2-18
1.8.7 X and Y
Registers
1-8 2.2.6 Motor Antistatic Brush . 2-20
1.8.8
Arithmetic Logical Unit (ALU) 1-8 2.2.7 Spindle Antistatic Brush 2-20
1.8.9 Local Storage Registers (LSR) 1-9 2.2.8 Disk
Speed Transducer .
2-21
1.9.0
INITIAL SYSTEM CHECKOUT.
1-10 2.2.9 Motor Tension Spring 2-23
1.10.0 EVENT INDICATOR
SEQUENCE. 1-10 2.2.10 Shock Mount (Top One) 2-24
1.11.0 MICRO
INTERRUPTS.
1-11
2.2.11 Shock Mounts (Bottom Two) 2-24
1.12.0 SYSTEM
PARITY CHECKING AND 2.3.0 CABLE
AND CARD LOCATIONS.
2-26
PARITY GENERATION.
1-12
1.13.0 I/O
PARITY CHECKING AND
3.0.0
33FD DISKETTE DRIVE.
3-1
GENERATION.
1-13 3.1.0 THEORY
3-1
1.14.0 OPERATION RETRY
AND ERROR 3.1.1 33FD Description 3-2
LOGGING 1-14 3.1.2 Diskette Format . 3-4
1.15.0
LOCATIONS.
1-15 3.1.3 Operating
Sequences
3-6
1.16.0 BOARD PIN LOCATIONS 1-16 Initialization 3-6
Seek.
3-6
2.0.0 DISK
DRIVE
2-1
Read or Write . 3-6
2.1.0
THEORY
2-1 3.1.4 Read/Write Circuit Principles. 3-8
2.1.1 Introduction
2-1
3.2.0 MAl NTENANCE . 3-9
2.1.2 Subframe
2-1
3.2.1 Machine Safety 3-9
2.1.3
Grounding.
2-1
3.2.2 Tools 3-9
2.1.4 Disk Enclosure 2-2 3.2.3
Head Cleaning Tools (3.2.10) . 3-9
2.1.5 Disk Spindle
2-2
3.2.3.1
Pressure Pad Replacement Kit
3-9
2.1.6 Transducer. 2-2 3.2.4 Diskette
Care . 3-10
2.1.7 Actuator 2-3 Handling 3-10
2.1.8 Actuator Lock 2-3 Long Term Storage 3-10
2.1.9 Actuator Position Indicator 2-3 Shipping and Receiving. 3-10
2.1.10 Circuitry Location 2-3 Inserting and Removing the
2.1.11 Disk Description .
2-4
Diskette 3-10
Data Tracks 2-4 3.2.5 33FD Diskette Drive
3-11
Servo Tracks 2-4 3.2.6 Latch Assembly 3-12
2.1.12 Landing Zone (LZ) 2-4 3.2.7 Collet 3-12
2.1.13 Guard
Band (GB) . 2-4 3.2.8 Cover Assembly 3-12
2.1.14 Motor and Brake . 2-5 3.2.9
Pressure Pad Actuator 3-13
Sector Format 2-6 3.2.10
Head and Pressure Pad Cleaning 3-13
Contents iii
TNL: SN31-0487 to SY31-0373-4 (25 Nov 77)

iv
3.2.10.1 Leadscrew Dust Cover
(if installed) 3-13 4.1.4
Input/Output Lines (continued)
3.2.11 Leadscrew and
Head Carriage Stop Ribbon (A) 4-13
Assembly 3-14 Hammer Check 1-22 (also 23-44
and
3.2.12 Drive Motor 3-15 45-66)
(P)
4-13
3.2.13 Hub Assembly 3-17 Activate
Paper Clamps (A) 4-13
3.2.14 Drive Pulley 3-17 Carriage Advance
(P)
4-13
3.2.15 Belt Tracking 3-17 Home
Pulse (P) 4-13
3.2.16 Idler Assembly 3-17 Throat Closed Switch
(P) 4-13
3.2.17 ReadIWrite
Head
3-18 Cover Closed Switch
(P)
4-13
3.2.18 Leadscrew
Wheel
3-19 Forms
Sensed Switch (P)
4-13
3.2.19 Lower
Limit Stop 3-20 Printer Thermal Switch (P)
4-13
3.2.20 Upper Limit Stop 3-20 4.1.5 Circuit
Cards (50, 100, and 155 Ipm) 4-14
3.2.21 Stepper Motor and Bracket
3-21
Hammer Driver 4-14
3.2.22 Phototransistor 3:22 Motors/Solenoid Driver 4-14
3.2.23 Light Emitting Diode (LED) 3-23 Control Card 4-14
3.2.24 File Control
Card
3-24 4.1.6 Card
Gate Connector Details
Test Points 3-24 (50, 100, 155 Ipm) 4-15
File Card
Pin Assignment 3-24 4.1.7 Printer Power
Plugs (50, 100, and
File Control
Card Socket Pins
3-25 1551pm) 4-15
4.1.8
Pin Reversal In Cables
4-16
4.0.0 BELT PRINTER 4-1
4.2.0 MAINTENANCE-(50, 100, 1551pm) 4-17
4.1.0
THEORY 4-1
4.2.1 Printer Cover and Divider Removal and
4.1.1 Principles
of Printing (50, 100, and Replacement 4-17
1551pm) 4-2 4.2.1.1 Printer Cover Grounding 4-17
4.1.2 Functional Components 4.2.2 Interlock Switch Description 4-18
(50, 100, and 155 Ipm) 4-5 4.2.2.1 Cover Interlock Switch 4-18
Type Belt Transducer 4-5 4.2.2.2 Print
Unit (Throat) Interlock Switch 4-19
Ribbon Drive 4-6 4.2.2.3 End-of-Forms Interlock Switch 4-19
Type Belt Drive 4-6 4.2.3 Thermal Switch 4-20
Carriage 4-7 4.2.4
Fan Assembly 4-21
Throat 4-10 4.2.5
24V Relay (Contactor Kl) 4-21
Paper Clamps 4-10 4.2.6 Diode 01 Service Check 4-22
4.1.3 Checking (50, 100, and 155 Ipm) 4-11 4.2.7 Motor Checkout Procedure (50, 100, and
Forms
Jam Check 4-11 1551pm) 4-23
Belt
Speed Check 4-11 Type Belt
Motor (50, 100, and
Carriage Sync Check 4-11 1551pm) 4-23
Coil Current Check 4-11 Carriage
Motor (50, 100, and
Belt Sync Check 4-11 1551pm) 4-24
Emitter Check 4-11 4.2.8 Motor
Phase Capacitor (50, 100, and
Data Check
4-11
1551pm) 4-25
Hammer Parity Check 4-11 4.2.9 Motor and
Paper Clamp Resistor (50, 100,
End of Forms Check 4-11 and 1551pm) 4-25
Throat
Closed Check 4-11 4.2.10 Print
Unit Assembly (50, 100, and
Cover
Closed Check
4-11
1551pm) 4-26
Unprintable Character Check
4-11
4.2.10.1 Print Units With Pivot
Screws 4-26
4.1.4
Input/Output Lines (50, 100, and 4.2.10.2 Print Units With Pivot
Pins 4-28
1551pm) 4-12 4.2.10.3 Print
Unit Stop Screw
POR/Printer
Reset (A) 4-12
(50,100, and 1551pm) 4-30
Close (+24V) Contactor (A) 4-12 4.2.11 Platen
Gap (50, 100, and 155 Ipm) 4-31
Belt Go (A) 4-12 4.2.12 Platen (50, 100, and 1551pm) 4-33
1
Belt Motion (P) 4-12 4.2.13 Type Belt (50, 100, and 155 Ipm) 4-35
PSS (Subscan) (P)
4-12 Static Test
for Type Belt Binds 4-35
IMPSS (Impression Singleshot) (P) 4-12 Dynamic Test
for Type Belt Binds 4-35
Fire Hammer (A) 4-12 4.2.14 Type Belt Drive Pulley Assembly 4-36
Carriage
Go (A) 4-13 4.2.15 Type Belt Motor
'4-37
4.2.16 Type Belt Positioning Rollers 4-37

. .
4.2.17 Type Belt Idler ~ulley 4-38 4.2.45.3 Print Units With Pivot
Pins and One Paper
4.2.18 Type Belt Idler Pulley Pivot Assembly 4-38 Clamp Engaging Lever 4-68
4.2.18.1 Without
Clevis (Old Style) 4-38 4.2.46 Forms Jam Detection Device 4-70
4.2.18.2 With Clevis (New Style) 4-38 4.2.47 Examples
of Incorrect Printing (50, 100,
4.2.19 Transducer Assembly (50, 100, and and 1551pm) 4-71
1551pm) 4-39 4.2.48 Lower Forms Guide
To Hammer Bar
4.2.20 Transducer 4-40 Adjustment 4-72
4.2.21 Impression Singleshot Potentiometer 4.2.49 Lower
Paper Guide To Hammer
(50, 100, and 155 Ipm)
4-41
Clearance 4-72
4.2.22 Transducer Position (Character
Cutoff) 4-42 4.3.0 LOCATIONS (50, 100,
and 1551pm) 4-73
4.2.23 Hammer Flight Time (50, 100, and 4.3.1 Back View 4-73
1551pm) 4-42 4.3.2 Front View 4-74
4.2.24 Hammer Coil (50, 100, and 155 Ipm) 4-43 4.3.3 Right
Side
4-75
4.2.25 Hammer (50, 100,
and 155 Ipm) 4-44 4.3.4 Left
Side
4-76
4.2.26 Hammer Block Assembly (50, 100, and 4.3.5
Card Gate (50, 100, and 155 Ipm) 4-77
1551pm) 4-45 4.3.6 Card and I/O Cables (50, 100, and
4.2.27 Ribbon Drive Description 4-46 1551pm) 4-78
4.2.28 Ribbon
Cassette (50, 100, and 155 Ipm) 4-47 4.4.0 OSCILLOSCOPE FIGURES
(50,100, and
4.2.29 Ribbon Drive Assembly 4-47 1551pm) 4-79
4.2.30 Ribbon Drive Clutch 4-48 4.5.1 Principles
of Printing (285 Ipm) 4-82
4.2.31 Ribbon Drive Belt 4-49 4.5.2 Functional Components
(285Ipm) 4-85
4.2.32 Ribbon Solenoid 4-50 Ribbon Drive 4-86
4.2.33 Ribbon Drive Rolls and Idler Rolls Type Belt Drive 4-86
(50, 100, and 1551pm) 4·51 Carriage 4·87
4.2.34 Ribbon Drag (50, 100, and 155 Ipm) 4·51 Throat 4·90
4.2.35 Ribbon Tracking (50, 100, and 1551pm) 4·52
Paper Clamps 4·90
4.2.35.1 For Ribbon Shields Without Guides 4·52 4.5.3 Checking (285 Ipm) 4·91
4.2.35.2 For Ribbon Shields With Guides 4·52 Forms Jam Check 4·91
4.2.36 Ribbon Shield (50, 100, and 155 Ipm) 4·52.1 Belt
Speed Check 4·91
4.2.37 Tractor Drive Shaft 4·53 Carriage Sync Check
4-91
4.2.38 Tractor Cover 4·53 Coil Current Check 4·91
4.2.39 Carriage Tractor/Vernier
!Tractor Drive Belt Sync Check 4·91
Shaft 4·54 Emitter Check 4·91
4.2.40 Carriage Motor 4·55 Data Check 4·91
4.2.41 Carriage Drive Belt 4·55 Hammer Parity Check 4·91
4.2.42 Upper Paper Clamp 4·56 End
of Forms Check 4·91
4.2.43 Upper Paper Clamp Assembly 4·57 Throat
Closed Check 4·91
4.2.44 Lower Paper Clamp (50, 100, and Cover
Closed Check 4·91
1551pm)
4·58
Unprintable Character Check 4·91
4.2.44.1 Two Coil Clamp with Two Engaging 4.5.4
Input/Output Lines (285 Ipm) 4·92
Levers
4·58 POR/Printer
Reset (A) 4·92
4.2.44.2 Single Coil Clamp With One Engaging
Close (+24V) Contactor (A)
Lever 4·60 Belt
Go (A) 4·92
4.2.44.3 Clamp Assembly Removal (Single Coil Belt Motion
(P)
4·92
Clamp With
One Engaging Lever) 4·62
PSS (Subscan) (P)
4·92
4.2.44.4 Clamp Bar Removal (Single Coil Clamp
IMPSS (Impression Singleshot) (P)
4·92
With One Engaging Lever) 4·62 Fire Hammer (A) 4·92
4.2.44.5 Coil Assembly Removal (Single Coil 4.5.5 Circuit
Cards (285 Ipm) 4·94
Clamp With
One Engaging Lever) 4·62 Hammer Driver 4·94
4.2.45 Forms Tension Assembly (50, 100, and Motors/Solenoid Driver 4·94
1551pm) 4·64 Control Card 4·94
4.2.45.1 Print Units
with Pivot Screws and Two
4.5.6 Card Gate Connector Details
Paper Clamp Engaging Levers
4·64
(285Ipm)
4·95
4.2.45.2 Print Units with Pivot Pins and Two Paper
4.5.7 Printer Power
Plugs (285 Ipm) 4·95
Clamp Engaging
Levers
4·66 4.5.8 Pin
Reversal In Cables
4·96
Contents v
TNL: SN31·0487 to SY31-0373-4 (25 Nov 77)

vi
4.6.0
MAINTENANCE
4-97 4.6.41 Carriage Drive Belt 4-136
4.6.1 Printer Cover and Divider Removal and 4.6.42 Upper
Paper Clamp 4-137
Replacement 4-97 4.6.43 Upper
Paper Clamp Assembly 4-138
4.6.1.1 Printer Cover Grounding 4-97 4.6.44 Lower
Paper Clamp (285 Ipm) 4-139
4.6.2 Interlock Switch Description 4-98 4.6.44.1 Two Coil Clamp with
Two Engaging
4.6.2.1 Cover Interlock Switch 4-98
Levers 4-139
4.6.2.2 Print
Unit (Throat) Interlock Switch 4-99 4.6.44.2 Single Coil Clamp With
One Engaging
4.6.2.3 End-of-Forms Interlock Switch 4-99 Lever 4-142
4.6.3 Thermal Switch 4-100 4.6.44.3 Clamp Assembly Removal (Single Coil
4.6.4 Fan Assembly 4-101 Clamp
with One Engaging Lever 4-144
4.6.5 24V Relay (Contactor K1) 4-101 4.6.44.4 Clamp
Bar Removal (Single Coil Clamp
4.6.6 Diode D1 Service Check 4-102 with One Engaging Lever) 4-144
4.6.7 Motor Checkout Procedure
(285Ipm)
4-103 4.6.44.5 Coil Assembly Removal (Single Coil
Type Belt Motor (285Ipm)
4-103 Clamp with One Engaging Lever) 4-144
Carriage Motor (285 Ipm) 4-104 4.6.45 Forms Tension Assembly
(285Ipm) 4-146
4.6.8 Motor
Phase Capacitor (285Ipm)
4-105 4.6.45.1 Print Units
with Two Paper Clamp
4.6.9 Motor and
Paper Clamp Resistor
Engaging Levers 4-146
(285Ipm)
4-105 4.6.45.2 Print Units
with One Paper Clamp
4.6.10 Print
Unit Assembly (285 Ipm) 4-106
Engaging Lever 4-148
4.6.10.1 Print
Unit Stop Screw (285 Ipm) 4-108 4.6.46 Forms
Jam Detection Device 4-150
4.6.11 Platen Gap (285 Ipm) 4-109 4.6.47 Examples
of Incorrect Printing
4.6.12 Platen (285 Ipm) 4-112
(285Ipm)
4-151
4.6.13 Type Belt (285 Ipm) 4-113 4.6.48 Lower Forms Guide
To Hammer Bar
Static Test for Type Belt Binds 4-113 Adjustment 4-152
Dynamic Test
for Type Belt Binds 4-113 4.6.49 Lower
Paper Guide To Hammer
4.6.14 Type Belt Drive Pulley Assembly 4-114 Clearance 4-152
4.6.15 Type Belt
Motor
4-115 4.7.0 LOCATIONS (285Ipm)
4-153
4.6.16 Type Belt Positioning Rollers 4-115 4.7.1 Back View 4-153
4.6.17 Type Belt Idler Pulley (285 Ipm) 4-116 4.7.2
Front View 4-154
4.6.18 Type Belt Idler Pulley Pivot Assembly 4-116 4.7.3 Right
Side
4-155
4.6.19 Transducer Assembly (285 Ipm) 4-117 4.7.4 Left
Side
4-156
4.6.20 Transducer 4-118 4.7.5
Card Gate (285 Ipm) 4-157
4.6.21 Impression Singleshot Potentiometer 4.7.6 Card and I/O
Cables (285 Ipm) 4-158
(285Ipm)
4-119 4.8.0 OSCILLOSCOPE FIGURES
(285Ipm)
4-159
4.6.22 Transducer Position (Character
Cutoff)
4-120
4.6.23 Hammer Flight Time (285 Ipm) 4-120 5.0.0 DISPLAY
UNIT
5-'
4.6.24 Hammer Coil (285Ipm)
4-121 5.1.0 THEORY
5-1
4.6.25 Hammer
(285Ipm)
4-123
5.1.1
Formation of Characters
5-1
4.6.26 Hammer Block Assembly (285 Ipm) 4-124 5.2.0
FUNCTIONAL CIRCUITS 5-2
4.6.27 Ribbon Drive Description 4-125
5.2.1
High Voltage Oscillator
5-2
4.6.28 Ribbon Cassette (285Ipm)
4-126 5.2.2 Brightness Control 5-2
4.6.29 Ribbon Drive Assembly 4-126 5.2.3 Video Dot
Amplifier
5-3
4.6.30 Ribbon Drive Clutch 4-127 5.2.4 Wiggle
Sweep Circuit
5-3
4.6.31 Ribbon Drive Belt 4-128 5.2.5 Horizontal Deflection Control
5-3
4.6.32 Ribbon Solenoid 4-129 5.2.6 Vertical Line Control 5-3
4.6.33 Ribbon Drive Rolls and Idler Rolls 5.3.0 OPERATION
5-4
(285Ipm)
4-130 5.4.0
MAINTENANCE 5-5
4.6.34 Ribbon Drag (285 Ipm) 4-130
5.4.1
CRT Safety 5-5
4.6.35 Ribbon Tracking (285 Ipm) 4-131 Protective Equipment 5-5
4.6.36 Ribbon Shields (285 Ipm) 4-132 Cathode
Ray Tubes-Safe Handling 5-5
4.6.37 Tractor Drive Shaft 4-134 Transportation Handling 5-5
4.6.38 Tractor Cover 4-134 Storage 5-5
4.6.39 Carriage Tractor/Vernier/Tractor Drive Testing 5-5
Shaft 4-135 Defective CRT Disposition 5-5
4.6.40 Carriage Motor 4-136 5.4.2 Display Assembly
5-7

5.4.3
5.4.4
6.0.0
6.1.0
6.1.1
6.1.2
6.1.3
6.1.4
6.2.0
6.3.0
6.3.1
6.3.2
6.3.3
6.3.4
6.3.5
7.0.0
7.1.0
7.1.1
7.1.2
7.1.3
7.1.4
7.1.5
7.1.6
7.1.7
7.1.8
7.2.0
7.2.1
(
Yoke Adjustment
MAP/Diagnostic Test Display Patterns
KEYBOARD
THEORY
Introduction
Key Modules
Key Detection
Clicker
Shift.
Character Repeat.
Character Storage
Control.
Input Lines
Basic Oscillator
Repeat Oscillator.
Error.
Busy Tone
Output Lines
Kbd Go .
Input Lines
Bit Lines
Key B
it Codes.
FUNCTION KEYS
MAINTENANCE.
Keyboard Assembly.
Key Module
Space Bar
Flyplate Replacement
CODE Key.
CONSOLES
OPERATOR
CONTROL PANEL
CONTROLS.
LOAD Key/Light
START Key/Light
POWER ON/OFF Switch
STOP Key/Light .
KEYBD RDY (Keyboard Ready) Light
PROC CH K (Processor Check) Light
PWR CH K (Power Check) Light.
TH CH K (Thermal Check) Light.
CE CONTROL PANEL .
MODE SELECTOR Switch
PROC RUN
INSN STEP/DPLY LSR
I
I
\
LSR Subdivision and Micro Interrupt
Levels
AL TERMAR IRPT
ALTER STOR
DPLY STOR
INSN STEP/DPLY
CH KS
Processing Unit Error Byte
(High-Order) .
Port Error Byte (Low-Order Byte)
INSN STEP/DPLY PCR
SYS INSN STEP.
(
5-7
5-8
6-1
6-1
6-1
6-1
6-1
6-1
6-1
6-1
6-1
6-2
6-2
6-2
6-2
6-2
6-2
6-2
6-2
6-2
6-3
6-4
6-7
6-7
6-7
6-7
6-8
6-8
7-1
7-2
7-2
7-2
7-2
7-2
7-2
7-2
7-2
7-2
7-3
7-3
7-3
7-3
7-3
7-4
7-4
7-4
7-5
7-5
7-5
7-5
7-5
"
7.2.2 IMPL-IPL Switches
7-6
IMPL Switch
7-6
IPL Switch.
7-6
7.2.3 PROC
INTERRUPT Lights
7-6
7.2.4 RESET Key
7-6
7.2.5
ADDRESS/DATA DISPLAY/DATA
Switches
7-7
7.2.6 CLOCK Light.
7-7
7.2.7 FORCE CLOCK Switch
7-7
7.2.8 CHECK Switch
7-7
7.2.9 CE START Key
7-7
7.2.10 LAMP TEST Switch.
7-7
7.2.11 DISPLAY INTENSITY Control
7-7
7.2.12 STOR SE L Switch
7-7
7.2.13 PWR FAULT DPLY Switch and DPLY
PWR CHK Key
7-8
7.2.14
ADD COMP Switch
7-8
RUN Position. 7-8
STOP Position
7-8
7.2.15 Feature Switches
7-9
COMM DPL Switch
7-9
8.0.0 POWER SUPPLIES
8-1
8.1.0 HIGH FREQUENCY
AND TRILEVEL
POWER SUPPLIES
8-1
8.1.1
Introduction
8-1
8.1.2 Power Sequence and
Distribution
8-2
8.1.3 Power On Sequence .
8-3
8.1.4 Power
Off Sequence.
8-4
8.1.5 Voltage
Sense and Power Fault Display
8-6
8.1.6 Power Faults
8-7
8.1.6.1 Thermal Switches
and Faults.
8-7
8.1.6.2 Overvoltage Fault
8-7
8.1.6.3 Undervoltage Fault
8-7
8.1.6.4 Overcurrent Fault
8-7
8.1.7 Control Voltage
Checkout.
8-7
8.1.8 Manual Bring-Up
Of The Multilevel,
Dual Level,
And Trilevel Supplies .
8-8
8.1.9 Power Supply Voltages.
8-9
8.1.10 Power Sequence Card
Pins And Test
Points
8-10
8.1.11 Power Supply Plug And Pin
Locations.
8-11
8.1.12 Terminal Board Locations
And Pins
8-12
8.2.0 FERRO RESONANT POWER
SUPPLIES 8-13
8.2.1 Introduction
8-13
8.2.2 Power Sequence
And Distribution
8-14
8.2.3 Power On Sequence .
8-15
8.2.4 Power Off Sequence.
8-16
8.2.5 Voltage
Sense And Power Fault
Display 8-18
8.2.6 Power Faults 8-19
8.2.6.1 Thermal Switches and Faults .
8-19
8.2.6.2 Overvoltage Fault 8-19
Contents
vii

viii
8.2.6.3 Undervoltage Fault 8-19 9.2.35 Print
Head Forms Guide 9-40
8.2.6.4 Overcurrent Fault 8-19 9.2.35.1 Print
Head Retract Ramp 9-40
8.2.7 Control Voltage
Checkout.
8-19 9.2.36 Print
Head Cable . 9-42
8.2.8 Manual Bring-Up
Of The DC Power 9.2.37 Felt and Wick Service 9-44
Supply.
8-20 9.2.38 Print
Head Ribbon Shield 9-44
8.2.9 Power Supply Voltages. 8-20 9.2.39 Print
Head Ribbon Lifter
9-44
8.2.10 Power Sequence Card
Pins And Test 9.2.40 Ribbon Drive 9-45
Points .
8-21
9.2.42 Ribbon Drive Clutches 9-45
8.2.11 Power Supply Plug And
Pin
9.2.43 Ribbon Drive Shaft 9-46
Locations.
8-22 9.2.44 Ribbon Drive Lines 9-46
8.2.12 Terminal Board Locations And
Pins
8-23 9.2.45 Ribbon
Feed Rolls 9-47
9.2.46 Ribbon Box and Cover . 9-48
9.0.0
SERIAL PRINTER
9-1
9.2.47 Ribbon Changing. 9-48
9.1.0
THEORY
9-1
9.3.0 LOCATIONS.
9-49
9.1.1 Introduction
9-1 9.3.1
Front and Right Side Locations 9-49
9.1.2 Functional Components 9-2 9.3.2 Front
and Left Side Locations 9-50
9.1.2.1 Stepper Motors 9-2 9.3.3
Bottom Locations
9-51
9.1.2.2 Print
Head Carrier 9-3 9.3.4
Base Locations 9-52
9.1.2.3 Forms
Feed
9-9 9.3.5 Power Supply Board Locations 9-53
9.1.2.4 Circuit
and Power 9-12 9.4.0 PRINT
QUALITY PROBLEMS 9-54
9.2.0
MAINTENANCE.
9-13 9.5.0
PR EVENTIVE MAl NTENANCE 9-55
9.2.1 Printer Cover 9-13
9.2.2 Separating The Printer From The 10.0.0
DATA COMMUNICATIONS.
10-1
Power Supply 9-14 10.1.0
INTRODUCTION
10-1
9.2.3 Platen
and Paper Deflector 9-16 10.1.1 Data Communications Abbreviations
10-1
9.2.4 Platen
Release Eccentrics 9-17 10.1.2 BSCA/SDLC Locations. 10-2
9.2.5 Platen
Gears
9-17 10.2.0 BSCA/SDLC CARD STRAPPING 10-3
9.2.6 Platen
Pressure Rolls 9-18 10.3.0 1200
BPS INTEGRATED MODEM.
10-4
9.2.7 Forms Tractor Unit . 9-19 10.3.1 Transmit Level Adjustment 10-4
9.2.8 Forms Tractor
Unit Chain Cover 9-19 10.3.1.1 WT
PSN Line Plate and Cable
9.2.9 Forms Tractor
Unit Chain.
9-20 Connections . 10-6
9.2.10 Platen Gear Backlash 9-20 10.3.2 Board Strapping 10-7
9.2.11 Forms Feed Motor Gear Backlash
9-21
Leased Line Board 10-7
9.2.12 Forms Feed Motor/Emitter
9-21
Switched Network Board 10-7
9.2.13 Forms Feed Motor/Emitter
9-22 10.3.3
Card Strapping 10-8
9.2.14 Forms
Feed Emitter Disk 9-23 Auto-Answer Basic
Card (A 1) 10-8
9.2.15 Forms
Feed Motor/Emitter
9-24 Equalizer Card
(A 1) . 10-8
9.2.16 A-Frame 9-25 Auto-Answer Interface Card (B2) 10-9
9.2.17.1 End-of-Forms Switch (Old Style) 9-26 Ring Integrity Card (E2) 10-9
9.2.17.2 End-of-Forms Switch (New Style) 9-27 10.4.0 2400
BPS INTEGRATED MODEM.
10-10
9.2.18 Print Emitter Pickup 9-29 10.4.1 Controls
and Indicators 10-10
9.2.19 Print Emitter 9-30 Test/Operate Diagnostic 10-12
9.2.20 Print
Emitter Hold Down Bracket 9-30
OPE RATE Switch 10-18
9.2.21 Left Margin 9-31
CADUCEE Feature . 10-18
9.2.24 Power Supply Board 9-32 Transmit Level
Limiting and Signal
9.2.25 Capacitor C3 9-33 Meter Adjustment 10-18
9.2.26 Power Transformer 9-34 10.4.2 Dial Tone
Detect.
10-19
9.2.27 Fan 9-34 10.4.3 Interface Signal Timings 10-20
9.2.28 Carrier Main
and Support Shafts. 9-36 10.4.4 Card Population Check and Card Strapping
9.2.29 Carrier and Main Shaft 9-36 Procedure. 10-21
9.2.30 Carrier Support Shaft 9-37 10.4.5 Preamplifier Strapping . 10-23
9.2.31 Carrier Drive Belt 9-38 10.4.6 Transmitter Interface Strapping . 10-24
9.2.32 Print Stepper
Motor.
9-39 10.4.7 Test/Operate, Timing Options Strapping 10-26
9.2.33 Carrier Leaf Spring and Bearing 9-39 10.4.8 SNBU Strapping . 10-29
9.2.34 Print Head . 9-40 10.4.9 Auto-Answer Interface
and Strapping . 10-30

10.4.10 Leased Line, Multipoint or Point-to-Point
Strapping. . . . . . . .. 10-31
10.4.11 CADUCEE Feature Card
Strapping. 10-32
10.4.12
Wave Forms . . . . . . . 10-33
10.5.0 MODEM
CABLING TO COMMON
CARRIER
10.6.0 MODEM CONTROL LINES . . 10-39 10-41
APPENDIX A. NUMBERING SYSTEMS. . A-1
BINARY AND HEXADECIMAL
CONVERSION. . . . . . A-l
Binary Number Notation . . . A-l
Hexadecimal Numbering System A-l
Hexadecimal and Decimal Conversion A-2
APPENDIX B. STEPPER MOTORS B-1
PRINTER STEPPER MOTORS B-1
Stepper Motor Characteristics B-1
Stepper Motor Operation . . B-1
Home Position A B (Reset) B-2
First Advance
Pulse A B (Generated by
Adapter) . . . . . .
B-2
Second Advance Pulse AB . B-3
Third Advance Pulse A B B-3
33FD STEPPER MOTOR . B-4
APPENDIX C. INSTALLATION
INSTRUCTIONS . . . . . C-1
SYSTEM/32 INSTALLATION AND
CONFIGURATION C-l
Disk Drive . . . . C-2
33FD Diskette Drive C-3
Belt Printer C-3
Serial Printer C-3
Forms Stand C-4
Display Unit C-4
Keyboard . C-4
Power Sequence C-4
BSCA/SDLC . C-5
Integrated Modem Installation Data Table. C-7
Power On Checks and Testing C-8
I/O Features . . . . . . . . C-9
To Complete the Installation. . . C-9
SCP SYSTEM CONFIGURATION AND
INSTALLATION . . . . C-l0
Diskettes Required . . . C-l0
System Configuration Steps C-l0
IN IT Procedure . . C-ll
BACKUP Procedure. C-12
APPLYPTF Procedure C-13
CNFIGSCP Procedure C-13
INDEX. . . • . . X-1
Contents ix

x