Xerox ColorQube 8570 Service Manual page 109

94,536, 94,538 ~ 94,541 Drum Thermal Faults
A Drum Heater error has occurred. The following troubleshooting procedure applies to these
errors.
Table 1 Applicable Fault Codes
94,536 Drum Heater is too hot.
94,538 Drum is heating too slow.
94,539 Drum Thermistor is open.
94,540 Drum Thermistor is bad.
94,541 Drum Thermistor bad reading, cannot trust temperature.
Initial Actions
• Reboot the printer and verify the error persists.
• Check the ambient room temperature.
• Check the Fan operation and vents.
• Check that the Drum Heater and Thermistor are plugged in.
• If the problem persists, perform the following procedure.
Troubleshooting Reference
Applicable Parts (Chapter 5 - Parts List)
• Drum Assembly, PL 2.1 Item 4
• Drum Fan, PL 4.1 Item 12
• Drum Thermistor (Temperature Sensor),
Wiring and Plug/Jack References (Chapter 7 - Wiring Data)
• Figure 5, I/O Board P/J Locations
• Figure 8, I/O Board, Sensors (1 of 2)
Procedure
Verify that the ambient temperature is within environmental specifications (room temperature)
(refer to Environmental Specifications in the Introduction and General Information Chapter). Is
the temperature within specifications?
Y N
Advise customer of operational requirements.
Check resistance across the Drum Thermistor.
• Check resistance on the wiring harness connector P/J902.
– At Room Temperature: 280 kohms
– At Operating Temperature: 50 kohms
Is it open or shorted?
Y N
Check airflow at the vents. Is there adequate clearance, and are the vents clean?
Y N
Clean the vents and/or advise customer of clearance requirements (refer to
ance and Mounting Surface Specifications
Check the Drum Fan for operational. Does the Drum Fan operate?
A
Xerox Internal Use Only - Revised, 3rd Revision
ColorQube 8570/8870 Service Manual
PL 6.1 Item 5
in the Introduction Chapter).
A
Y N
Replace the Drum Fan
Replace the Drum Assembly
Replace the Drum Temperature Sensor
Figure 1 Checking Drum Thermal Resistance
Clear-
October 2012
2-63
(REP 4.12).
(REP 2.4).
(REP 6.5) and or wiring cable.
Fault Messages and Codes
94,536, 94,538 ~ 94,541