Introduction; Troubleshooting Aids - Digital Equipment LG plus Series Maintenance Manual

Introduction

This chapter contains procedures for troubleshooting printer malfunctions.
This manual does not cover printer operation or configuration, but you must
operate the printer to check its performance, and sometimes you may have to
reconfigure the printer. Therefore, have the Operator's Guide and the Setup
Guide handy when you troubleshoot the printer.

Troubleshooting Aids

Troubleshooting is faster and more effective if you understand the equipment
and make use of all available tools. This manual provides a number of
troubleshooting aids to help you isolate printer malfunctions:
LCD Message Troubleshooting Table (Page 3–3)
A troubleshooting symptom table of fault messages that can appear on
the Liquid Crystal Display (LCD). The fault messages are defined and
solutions provided.
Symptoms Not Indicated by Fault Messages (Page 3–29)
This section summarizes how to troubleshoot problems that are not
indicated by LCD messages. This section includes a logic table for
troubleshooting common problems.
Printer Confidence Check (Page 3–34)
A systematic check of printer operation in the form of a logic table. You
can use this procedure to establish basic printer status or to troubleshoot
imprecise or intermittent symptoms.
Diagnostic Printer Tests (Page 3–35)
A set of printer tests included in the configuration menu structure for use
as diagnostic and maintenance tools.
Hex Code Printout (Page 3–41)
The procedure for printing data streams in hexadecimal format. This
procedure can help you troubleshoot printer data reception problems.
ASCII Character Set (Page 3–43)
A chart of standard ASCII characters and their equivalent codes.
Appendix A: Wire Data
System interconnect and power distribution diagrams, circuit board
pin–outs, and diagrams of the cable assemblies. Use as source material
for tracing electrical problems.
3–2 Troubleshooting