Table of Contents
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Chapter 6
T R O U B L E S H O O T I N G
6.1 Board layouts, page 6-2
Liaison board KP-908, page 6-2
Scanner interface board KP-697, page 6-3
Connect board connector/KP-910, page 6-3
Fuser board KP-499/YC-721, page 6-4
6.2 Overall wiring diagram, page 6-5
6.3 General error handling, page 6-6
Maintenance messages, page 6-6
Error messages, page 6-8
6.4 Diagnostic, page 6-11
2000-Main motor error, page 6-13
5300-Eraser disconnection detection, page 6-14
6000-Fuser unit error, page 6-14
6020-Abnormal high temperature error, page 6-14
7001-Toner motor error, page 6-15
7350-Toner refreshing mode error, page 6-15
F0/F000-Main board error, page 6-15
F010-System DIMM [board] error, page 6-16
F020-Main or expanded memory error, page 6-16
F030-Main board system error, page 6-16
F040-Communication error, page 6-16
F070-Flash ROM write error, page 6-16
F080-Engine board flash ROM error, page 6-17
False error-Feed unit cover open, page 6-18
6.5 Print quality problems, page 6-22
Completely blank printout, page 6-22
All-black printout, page 6-22
Dropouts, horizontal streak, black dots, page 6-23
Black vertical streaks, page 6-23
Unsharp printing, page 6-24
Grey background, page 6-24
Dirt on the top edge or back of the paper, page 6-25
Incorrect printing registration, page 6-25
Checking cassette size sensors, page 6-26
Drum cleaning, page 6-27
Repetitive defects gauge, page 6-27
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