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5256-1
Maintenance information manual
IBM 5256-1 Maintenance Information Manual
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Contents
Table of Contents
Bookmarks
Table of Contents
Safety
Table of Contents
Glossary of Terms and Abbreviations
Legend
Using the Ibm 5256 Maintenance Information Manual
Glossary of Terms and Abbreviations
Maintenance
Wiring Diagram
Diagnostic Aids
Preventive Maintenance
Tools and Test Equipment
Theory
Features
Appendix A . Index
Maintenance
Sequence-Affected Procedures
Locations
Front and Right Side Locations
Front and Left Side Locations
Back Locations
Printer Mechanism Bottom Locations (Print Mechanism in Service Position)
Printer Mechanism Base Locations
Power Supply Board a 1 Locations and Jumpers
Planar Board Bl Locations and Jumpers
Cabling Locations and Station Protector
Motor Cables (EC2 to Tpbl and TPB2)
Cover
Printer Covers
Adjustment
Top Cover Removal and Replacement
Back Cover Removal and Replacement
Front Cover Removal and Replacement
Control Panel and AC Cable Assembly
Control Panel Removal and Replacement
AC Cable Assembly Removal and Replacement
Service Positions
Separating the Printer from the Power Supply Board A1 for Service Positions
Moving the Power Supply for Printer Servicing
Part Numbers
Forms Moving Parts
Platen and Paper Deflector
Removal and Replacement
Platen Latches (Release Eccentrics and Springs)
Adjustment
Platen Gears and Bushing
Removal, Replacement, and Adjustment
Platen Pressure Rolls
Adjustment
Platen Gear Backlash (Play)
Adjustment
Forms Motor Gear Backlash (Play)
Adjustment
Forms Motor and Emitter
Removal and Replacement
Disassembly
Assembly
Forms Feed Emitter Disk
Adjustment
Forms Motor to Emitter Timing
Service Check
Adjustment
Frame
Service Check
Alignment
End-Of-Forms Switch
Service Check
Adjustment
Removal and Replacement
Forms Tractor Unit
Removal and Replacement
Disassembly and Assembly
Left Tractor Acljustment
Forms Tractor Unit Chain Cover
Service Check
Adjustment
Forms Tractor Unit Chain
Removal and Replacement
Forms Guide Rack Static Eliminator Replacement
Printer Emitter
Print Emitter Board to Pickup and Amplifier Card
Service Check
Adjustment
Printer Emitter Pickup and Amplifier Removal and Replacement
Print Emitter Board
Removal and Replacement
Print Emitter Hold down Bracket
Adjustment
Left Margin
Service Check
Carrier
Carrier Main and Support Shafts
Service Check
Adjustment
Carrier Support Shaft
Removal and Replacement
Carrier and Main Shaft
Belt Tensioner Assembly
Removal and Replacement
Carrier Motor and Pulley
Removal and Replacement
Carrier Leaf Spring and Bearing
Print Head
Service Check
Adjustment
Removal and Replacement
Print Head Forms Guide
Adjustment
Removal and Replacement
Print Head Cable (EC1)
Removal
Replacement
Oil Felt Service
Print Head Ribbon Lifter
Print Head Ribbon Shield
Copy Control Dial
Print Head Retract Ramp
Adjustment
Removal and Replacement
Ribbon Drive Clutches
Removal and Replacement
Ribbon Drive Shaft
Ribbon Drive Lines
Ribbon Feed Rolls
Service Check
Adjustment
Removal and Replacement
Ribbon Drive Gears
Ribbon Box and Cover
Ribbon Changing
Power and Electronics
Power Supply
Removal and Replacement
Ripple Level Check
Power Transformer
Fans
Fan B1 Removal and Replacement
Fan B2 Removal and Replacement
TB2 and Line Filter
TB2 Removal and Replacement
Line Filter Removal and Replacement
Power Adapter Board C1 and Capacitor Assembly
Capacitor Service Check
Removal and Replacement
AC Capacitor (C12) and Capacitor C3
C12 Removal and Replacement
C3 Removal and Replacement
Power Supply Board A1 and Cable
Removal and Replacement
Transistor (Q1)
Service Check
Removal and Replacement
Planar Board B1
Removal and Replacement
Printer Wiring Diagram
Diagnostic Aids
Power on Diagnostic
Offline Tests
Print Test (PRT04)
Carrier Motor (PRT05)
Forms Motor (PRT06)
Alignment (PRT07)
Print Character Set (PRT08)
Print Receive Buffers (PRT09)
Left Margin Recognition (PRT10)
Printer Characteristics Display (PRT11)
Data Storage (PRT12)
Address Switches (PRT13)
Set Transparent Mode (PRT14)
Print Wiresltab (PRT15)
Online Tests
Online Tests Overview
Matrix Printer Verification Test (Online Exerciser)
Matrix Printer Verification Test Printout
Error Codes and Descriptions
Lights
Print Quality and Registration Problems
Print Quality Problem Examples
Registration Problem Examples
Probe, Probing Information, and Interposer Check
Probe Setup and Accessories
Probe Power
Probe Test
Probe Light Conditions
Probing EC1, EC2, and C1A 1
Continuity Check for Interposers
Removing Wire from Plugs P2, P3, P4, and P5
Preventive Maintenance
Theory
Introduction
Printer Operation Overview and Data Flow
System Configuration
Cable Adapter
Frame Concept
Transmission Sequences
Commands
Poll Response Frames
Read Status Response Frame
Printer SCS Formatting Control Characters
Set Graphic Error Action Summary
Set Horizontal Format Summary
Set Vertical Format Summary
Interface
Poll for Status
Write Data
Data Transfer
Microprocessing Unit
Read/Write Storage
Internal Processing Queues
Control Panel and CE Lights
Sense Latches
Print Emitter Control and Print Timings
Power and Signal Distribution
Power on and Power off Timings
Functional Parts
Motors
Print Head
Carrier
Print Emiiter and Print Emitter Pickup
Ribbon Drive
Forms Feed
Forms Tractor Unit
Features
Cable Thru
Audible Alarm
SECTION 1. Standalone Checkout
Cable Thru Feature
Section 2. Connecting to the System
Problem Check List
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5256-3
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