Lexmark T520 Service Manual - Page 125
Printer Printing Test
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4520-xxx FRU 3 HVPS Action Check the following voltages at J10-8 on the engine board: Printer Idle J10-8 measures 0 V dc Printer Printing Test Page J10-8 voltage changes from 0 V dc to +4 V dc If the voltage does not vary, check the continuity of line J10-8 in the front cable harness. If there is no continuity, replace the cable harness. If there is continuity, replace the HVPS. If this does not correct the problem, replace the engine board. Turn the printer off and check the resistance between J10-7 and printer ground. The resistance measures approximately 0 ohms. If incorrect, make sure the engine board is mounted correctly and securely grounded. If correct, replace the engine board. Diagnostic Information 2-97
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Diagnostic Information
2-97
4520-xxx
3
HVPS
Check the following voltages at
J10-8 on the engine board:
Printer Idle
J10-8 measures 0 V dc
Printer Printing Test Page
J10-8 voltage changes from 0 V dc
to +4 V dc
If the voltage does not vary, check
the continuity of line J10-8 in the
front cable harness. If there is no
continuity, replace the cable
harness. If there is continuity,
replace the HVPS. If this does not
correct the problem, replace the
engine board.
Turn the printer off and check the
resistance between J10-7 and
printer ground. The resistance
measures approximately 0 ohms. If
incorrect, make sure the engine
board is mounted correctly and
securely grounded. If correct,
replace the engine board.
FRU
Action