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351
Technical manual
Centronics 351 Technical Manual
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
Section 1-General Information
Scope
General Description
Physical Description
Printing Mechanism
Paper Handling Mechanism
Electronics
Power Supply
Printer Operation
Character Printing
Paper Motion
Special Functions
Related Publications
Unpacking/Repacking Instructions
Users Manual
Illustrated Parts Manual
1-3 Characterprinting/Papermotion
1-2 Major Assembliesmodel351
8085 Microprocessor System
General
Model 351 Basic Functional Block Diagram
Memory/ Interface
Parallel Interface
Data Strobe
Data Lines
Input Prime
Acknowledge
Busy
Demand
Out
Paper Empty
Select
Fault
Program Memory
Random Access Memory
2-2
Current Loop Option
Line Transceivers
Motor Drive Circuits
Carriage Motor Drive
Ribbon Motor Drive
Paper Feed Motor Drive
Serial Data Connector
Serial Interface
Carriage Drive and Ribbon Drive Circuits
Paper Feed Stepper Motor Driver
DC Power Requirements
Print Head Drive Circuit
Printer Interlock Circuit
Programmable Interval Timer Circuit
Video Timing Circuit
TACH ( - ) and TACH ( +) Signals
Data Link
Basic Troubleshooting
Self-Test Printout
Maintenance Summary
Section 3-Maintenance
Troubleshooting Flow Charts
Troubleshooting Guide
3-3
No Print Head Movement on Power-Up Troubleshooting Flow Chart
Control Panel Switches and Indicators Troubleshooting Flow Chart (Sheet 1 of 3)
Control Panel Switches and Indicators Troubleshooting Flow Chart (Sheet 2 of 3)
Control Panel Switches and Indicators Troubleshooting Flow Chart (Sheet 3 of 3)
3-3 Basictroubleshootingflow Chart(Sheet2 of 2)
3-4 no Power-Up(Deadprinter)Troubleshootingflowchart
3-8 Print Headmovement,Papermovement,No Printouttroubleshooting
3-7
Broken Characters (Missing Dots) Troubleshooting Flow Chart
Missing or Wrong Characters Troubleshooting Flow Chart
Preventive Maintenance
Printer Markings
Printed Circuit Board Markings
Printer Nameplate
Printed Circuit Board Marking
Adjustment Summary
Carriage Drive Belt
Carriage Drive Belt Adjustment
Section 4-Adjustments
Carriage Drive Motor Belt
Carriage Drive Motor Belt Adjustment
Paper Drive Belt
Tractor Gear Backlash
Tractor Gear Backlash Adjustment
4 Optical Sensor and Encoder/Timing Disc
Mechanical Adjustment
Paper Drive Belt Adjustment
Paper Empty Switch
Paper Empty Switch Adjustment
Mechanical Adjustment, Optical Sensor and Encoder /Timing Disc
Electrical Adjustment
Horizontal Offset
Horizontal Offset Dip Switch
Horizontal Offset Print Sample
Removal/Replacement, Recommended Spares
Section 5-Removal/Replacement
Cover Assemblies
Top Cover
Rear Cover
Body Cover
Cover Interlock Magnet
Paper Inlet Rack
Paper Outlet Rack Assembly
Head Flex Cable
Print Head Assembly
Ribbon Cassette and Guide
Head Adapter Pcb
Printer Mechanism
Tilting Printer Mechanism
Removing Printer Mechanism
Tilting Printer Mechanism
Removing Printer Mechanism
Dust Cover
Carriage Drive Belt
Carriage Drive Motor Belt
Optic Sensor Assembly
Carriage Drive Motor
Removal/Replacement, Carriage Drive Motor
Encoder/Timing Disc
Ribbon Drive Motor Mounting Bracket
Cover Interlock Switch
Ribbon Drive Motor
Paper Drive Belt
Removal/Replacement, Paper Drive Belt
Paper Drive Motor
Paper Empty Switch
Tractor Assemblies, Left I Right
On/Off Switch
Cover Latch Springs
Main Fuse
Power Cord
Pico Fuse
Formatter/Controller Pcb
Power Supply Assembly
Recommended Spare Parts Listing
Section6-0Ptions/Accessories
Accessories
General
Options
Appendix Aelectrical Drawings
Assembly Drawing, Formatter /Controller (64001101-8001
Formatter /Controller PCB Assembly
General Information
Wiring Diagram, Model 351
Schematic Diagram, Formatter /Controller (64001101-9001) (Sheet 1
Schematic Diagram, Formatter /Controller (64001101-9001) (Sheet 2
Schematic Diagram, Formatter /Controller (64001101-9001) (Sheet 3
Schematic Diagram, Formatter/Controller (64001101-9001) (Sheet 4
Schematic Diagram, Formatter/Controller (64001101-9001) (Sheet 5
Schematic Diagram, Formatter /Controller (64001101-9001) (Sheet 6
Schematic Diagram, Formatter /Controller (64001101-9001) (Sheet 7
Schematic Diagram, Formatter/Controller (64001101-9001) (Sheet 8
Schematic Diagram, Formatter /Controller (64001101-9001) (Sheet 9
Schematic Diagram, Formatter/Controller (64001101-9001) (Sheet 10
Schematic Diagram, Formatter/Controller (64001101-9001) (Sheet 11
Assembly Drawing, Control Panel and Memory Section
Assembly Drawing, Serial and Parallel Input Section, Formatter /Controller PCB Assembly
Assembly Drawing, Print Head Driver and D.C. Power Entry Section
Appendixb-Interfaceinformation
General Information
Parallel Interface Connection
Serial Interface Connection
Interface Connector Locations and Cables
Parallel and Serial Interface Connectors
Appendixc-Controlsandindicators
Control Panel Dip Switches
Control Panel Switches and Indicators
General
Mechanism Controls and Switches
Printer Mechanism Controls and Switches
Control Panel Switches and Indicators
Control Panel Dip Switches
Printer Features Dip Switch S1
Printer Features Dip Switch S2
Printer Features Dip Switch S3
Printer Features Dip Switch S4
Printer Features Dip Switch S3
Printer Features Dip Switch S4
Appendix Dpico Fuse Color Code
General Information
Appendix Emodel 351-3 & 351-4 Printers
Documentation
Model 351-3 Printer
Model 351-4 Printer
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CEnTRDnlCS
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TP 7-80
MODEL 351
C:I
PRINTER
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37403510·9810
REV. 81
APRIL 1984
.
CE1111~u111LS
C:EnTRDnlCS
CEnTRDnlCS
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TECHNICAL MANUAL
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Table of Contents
Troubleshooting
SECTION 3-MAINTENANCE
25
Self-Test Printout
26
No Print Head Movement on Power-up Troubleshooting Flow Chart
34
Control Panel Switches and Indicators Troubleshooting Flow Chart (Sheet 1 of 3)
35
Control Panel Switches and Indicators Troubleshooting Flow Chart (Sheet 2 of 3)
36
Control Panel Switches and Indicators Troubleshooting Flow Chart (Sheet 3 of 3)
37
Broken Characters (Missing Dots) Troubleshooting Flow Chart
40
Missing or Wrong Characters Troubleshooting Flow Chart
41
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