Introduction; Power-Up Error Messages And Led Codes; Jam Codes - Xerox Phaser 8400 Service Manual

Introduction

This section covers troubleshooting procedures for the printer using front panel error
messages and codes. Some procedures require running service diagnostic test
functions to verify that a specific printer part is operating correctly. For information
on Service Diagnostics and all internal printer test functions, see the table "Service
Diagnostics Mode Menu" on page 4-5.
To troubleshoot problems, such as startup and power on, media, paper path, print-
quality or image problems, and electrical failures not associated with a front panel
message or code, refer to the section "General Troubleshooting" on page 4-1.
If an error message or code is not visible on the front panel, the Service Usage Profile
report and Printer Status page list errors reported by the printer.

Power-Up Error Messages and LED Codes

The printer has three sets of tests that are run when the printer is first powered on:
Built-In Self Tests (BIST), Power On Self Tests (POST), and Print Engine Self Tests
(PEST). BIST verifies basic Electronics Module CPU operation and reports failures
with interface panel LED blink codes ( The sum of the flashes equal the error code, 7
flashes equals error code 7 ). POST checks communication paths from the
Electronics Module CPU to other parts of the Electronics Module and to some other
systems of the printer. PEST runs once Postscript is operational, and checks for
connection to and operation of, various system components.
POST testing initializes the front panel and if an error occurs a POST error message
will be displayed on the front panel LCD. POST errors are also displayed using
interface panel LED patterns in case the communication path to the front panel has
failed.
Some POST errors are "soft" errors that do not prevent the printer from powering up
completely. These errors are displayed on the front panel for 5 seconds and then the
printer continues through the remainder of POST. Because soft errors do not stop the
printer from powering up, there are no rear panel LED codes associated with them.
Most soft errors will also cause the printer to print a Startup Page with the error
message on it. BIST and POST errors are not stored in the fault history logs.

Jam Codes

The Jam Codes provide a basis for troubleshooting printer problems that occur as the
result of misfeeds or jams within the paper path. Refer to the "3-Digit Jam Codes" on
page 3-35 and to the Xerox infoSMART knowledge base at www.xerox.com/office/
infoSMART for the latest information on Jam Code interpretation.
3-2 Phaser 8400 Color Printer