Xerox ColorQube 8570 Service Manual page 74

91,547, 91,551, 91,555, 91,858, 91,870 Printhead Reservoir
Thermal Faults
A Printhead Reservoir Thermal error has occurred. The following troubleshooting procedure
applies to these errors.
Table 1 Applicable Fault Codes
91,547 Reservoir Heater is too hot.
91,551 Reservoir Heater is too slow.
91,555 Reservoir Heater thermistor is bad.
91,858 Reservoir thermistor is open.
91,870 Reservoir thermistor is shorted.
Initial Actions
• Reboot the printer and verify the error persists.
• Check the Printhead wiring harness connectors.
• If the problem persists, perform the following procedure.
Troubleshooting Reference
Applicable Parts (Chapter 5 - Parts List)
• Printhead Assembly, PL 2.1 Item 3
• Cable, Printhead Interface, PL 5.1 Item 20
Wiring and Plug/Jack References (Chapter 7 - Wiring Data)
• Figure 2, Wave Amplifier, Printhead
• Figure 6, Printhead P/J Locations
Procedure
Restart the printer and allow to warm up. Check the Reservoir Thermistor wiring harness con-
nector P/J190 (2-pin) on the Printhead Board. Is the connection secure and undamaged?
Y N
Reseat and/or replace the wiring harness (Printhead Interface Cable).
Check the Printhead wiring harness connectors
nections secure and undamaged?
Y N
Turn off the printer.
Check the Thermistor for continuity on
• Short pin 4 to pin 10.
• Measure the Thermistor to ground.
– Pin 3 (Reservoir Thermistor) to pin 4
• Check the results as follows:
– Good: 4.88 kohms at room temperature (The Printhead must be cool.)
– Open Thermistor: 4.99 kohms
– Shorted Thermistor: 0 Ohm
Does the error persist?
Y N
Troubleshooting complete.
A B
Fault Messages and Codes
91,547, 91,551, 91,555, 91,858, 91,870
P/J180 and P/J240 and wiring. Are the con-
P/J110 connector (see Figure 1).
A B
Replace the Printhead Assembly
Replace the Printhead Assembly
Figure 1 Wiring Harness Connectors
October 2012
2-28
(REP 2.3).
(REP 2.3).
Revised, 3rd Revision - Xerox Internal Use Only
ColorQube 8570/8870 Service Manual