Xerox 4400DT - Phaser B/W Laser Printer Service Manual page 54

Error Message Summaries (cont'd.)
Note: The messages listed in the "Diagnostic Message" column
appear only in Service Diagnostics while printing Engine
Test Prints. The code numbers in these messages also
appear as part of the Help information displayed when you
press i.
Front Panel Diagnostic
Message Message
Fuser Failure U4 Fuser Fail/Power
Off
Press i.
Fan Failure U5 Fan Fail/Power
Off
Power Off Now
Press i.
Engine Logic U6 NVM Fail/Power
Board NVRAM Off
Failure.
Press i.
Phaser 4400 Laser Printer Service Manual
Error Description Troubleshooting
Low temperature
I
trouble/Power off
(Fuser temperature
drops below the set
temperature after the
Fuser warm-up is
complete).
Warm-up
I
fail/Power off (Fuser
warm-up does not
complete within 110
seconds).
STS Disconnection
I
fail/Power off
(Thermistor circuit is
detected to be open).
High Temperature
I
trouble/Power off
(Fuser temperature
rises above the set
temperature).
Continuous heat
I
on/Power off (Heat
rod is on for 10
seconds when the
Main Drive Motor is
stopped, after the
Fuser warm-up is
completed).
Main Fan has failed.
1. Read error
detected during
power-on.
2. Write Error
detected.
Procedure
Go to Fuser Failure.
page 2-49.
Check the Main Fan.
Power Off and On.
Go to Fan Failure; Power
Off Now. on page 2-49.
Power Off and On.
Go to Engine Logic Board
NVRAM Failure. on
page 2-50).
on
2-17