IBM System/32 Introduction And Maintenance Manual page 4

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 BEL T 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