October 2012
2-72
ColorQube 8570/8870 Service Manual
99,006, 99,008
Revised, 3rd Revision - Xerox Internal Use Only
Fault Messages and Codes
• Printhead Assembly (REP 2.3).
Replace the Right Side Power Control Harness.
Perform procedures in RAP 99,002, 99,003 Jetstack Disconnect.
Replace the Drum Assembly (REP 2.4). Does the error persist?
YN
Troubleshooting complete.
Replace the Electronics Module (REP 5.1).
99,008 PEST - Preheat Heater Disconnect
A Preheat Heater error has occurred. The Preheat Heater is not drawing the expected power
from the Power Supply. The following troubleshooting applies to this error.
Initial Actions
• Reboot the printer and verify the error persists.
• Check the Preheat Heater’s wiring connection.
• Check that the Preheater is plugged in.
• If the problem persists, perform the following procedure.
Troubleshooting Reference
Applicable Parts (Chapter 5 - Parts List)
• Preheater and Deskew Assembly, PL 2.1 Item 20
• Electronics Module, PL 5.1 Item 1
• Right Side Power Control Harness, PL 5.1 Item 13
Wiring and Plug/Jack References (Chapter 7 - Wiring Data)
• Figure 2, Right Side Electronics Module P/J Locations
• Figure 3, Front Side Wire Routing
• Figure 4, Bottom Front Wire Routing
• Figure 6, Hard Drive, Drum Heater, Paper Preheater
• Figure 9, I/O Board, Sensors (2 of 2)
Procedure
Check the wiring harness connectors P/JAC3, P/J115, and P/J125. Are the connections
secure and undamaged?
YN
Reseat and/or replace the wiring harnesses.
Disconnect the wiring harness connector P/JAC3 from the right side of the Electronics Module.
• At the harness, measure the red-black Preheater circuit; the circuit should measure ~55
ohms.
Are they open or shorted?
YN
Check the Heater. Is the Heater test open?
YN
Perform the following checks:
• Test F3 in the Power Supply. Refer to Testing F2 and F3 in the Electrical Trou-
bleshooting section in Chapter 6, General Troubleshooting.
• Test for bad Jetstack triac. Refer to Checking for Shorted and Leaky Triacs in
the Electrical Troubleshooting section in Chapter 6, General Troubleshooting.
• Test for shorts to Earth. Measure the resistance of P/JAC2 Pin 1 to Pin 7. It
should be greater than 2 Megaohms.
Are F3 and the triacs OK and is P/JAC2 Pin 1 to Pin 7 greater than 2 Megao-
hms? (Ensure your DMM is rated to measure high-impedance resistance.)
Table 1 Applicable Fault Code
99,008 PEST - Preheat Heater Disconnect
A B C
A B
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General
Weight and Dimensions
