Error Messages and Codes 3-31
Engine Logic Board NVRAM Failure
Error Code
U6: NVM Fail
Troubleshooting Reference
Applicable Parts Wiring and Plug/Jack Map References
■ HVPS/Engine Logic Board ■ “24 V Interlock, Rear Cover Switch, Main Motor, Sub
Fan, Exit Motor Assembly” on page 10-18
■ “Print Engine General Wiring Diagram” on
page 10-17
■ “Print Engine Plug/Jack Locator” on page 10-3
Troubleshooting Procedure
Steps Actions and Questions Yes No
1
Does the error occur when the power is
turned ON?
Go to step 4. Go to step 2.
2
Turn the power OFF and ON again.
Does the error still occur?
Go to step 4. Go to step 3.
3
Cycle the power OFF, then ON several
times.
Does the error still occur?
Go to step 4. Problem solved.
4
Replace the HVPS/Engine Logic Board.
(page 8-89)
Does the error occur?
Go to “Electrical
Noise” on
page 4-41.
Problem solved.
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