Pest - Vpp/ Vss Measurement Too Low - Xerox ColorQube 8570 Service Manual

99,059, 99,060 PEST - VPP/ VSS Measurement Too Low

A Wave Amp error has occurred. VPP/ VSS measurement is too low. The Printhead power
cable may be disconnected. The following troubleshooting procedure applies to these errors.
Table 1 Applicable Fault Codes
99,059 PEST - VSS measurement too low, head power cable may be disconnected.
99,060 PEST - VPP measurement too low, head power cable may be disconnected.
Initial Actions
• Reboot the printer and verify the error persists.
• Check the component power connections and harness condition.
• If the problem persists, perform the following procedure.
Troubleshooting Reference
Applicable Parts (Chapter 5 - Parts List)
• Printhead Assembly, PL 2.1 Item 3
• Wave Amplifier, PL 5.1 Item 9
• Cable, ZIF, Wave Amp Drive, PL 5.1 Item 19
Wiring and Plug/Jack Reference (Chapter 7 - Wiring Data)
• Figure 2, Wave Amplifier, Printhead Heaters
• Figure 3, Left Side Electronics Module P/J Locations
• Figure 6, Printhead P/J Locations
• Figure 7, Wave Amp P/J Locations
Procedure
The white Printhead Data cable connects using locking ZIF connectors. Handle the ribbon
cables carefully. Check that each cable is square to the socket and fully inserted before locking
the connector. Damage to the Wave Amplifier could result from improper cable connections.
Check the wiring harness connectors
Printhead Board, and P/J901 on the Power Control Board.
Release the end of the cable and carefully examine the conductor ends (a magnifier helps) to
see that they are not cracked or torn. If the cable looks good, carefully reinstall it using a ZIF
tool (refer to REP 2.3 for how to use the ZIF tool for unlocking/locking the ZIF cable connector).
NOTE: Failure to properly unlock the connector will damage the cable.
Are the connections secure and undamaged?
Y N
Reseat the wiring harnesses.
Replace the Wave Amp Signal Cable and/or Wave Amp Drive Cable. Does the error persist?
Y N
Troubleshooting complete.
Unplug the Wave Amp Drive cable, then test VPP/VSS points on the Printhead Board wiring
harness connector P/J110 (see Figure 1). Measure resistance of each to ground.
• Pin 1 (VSS)
Fault Messages and Codes
99,059, 99,060
CAUTION
P/J640 & P/J800 on the Wave Amp,
• Pin 2 (Ground)
• Pin 3 (VPP)
Is either one shorted?
Y N
Replace the Wave Amplifier
Replace the Printhead Assembly
P/J240 on the
October 2012
2-86
(REP 5.9).
(REP 2.3).
Figure 1 Printhead Board Test Points
Revised, 3rd Revision - Xerox Internal Use Only
ColorQube 8570/8870 Service Manual