24 Close the top cover.

•Check P4-5 for continuity to ground.

Is there continuity?

No: Replace the AC power supply, then turn to TAG 002: Check & Problem Resolution.

Yes: Repair or replace the top cover interlock switch assembly. If this resolves the problem, turn to TAG 002: Check & Problem Resolution. If this does not resolve the problem, repair or replace the connectors or wiring from: P4-5 to J/P84-1 to P131, or P132 to J/ P84-2 to P4-6; then turn to TAG 002: Check & Problem Resolution.

25 Is the operator panel blank and are the cooling and AC power supply fans off?

No: You have chosen an incorrect TAG. Refer to the mechanical malfunctions cross-reference table in “Mechanical Malfunction/TAG Cross-Reference” on page 2-12 , to identify a more appropriate TAG.

Yes: Continue.

26 Turn off the printer and unplug the power cord.

•Check the wall power outlet for proper voltage.

Is the voltage correct? If the circuit breaker was reset after beginning this TAG, answer no.

No: Go to #28 in this TAG.

Yes: Continue.

27 Unplug power cord from the printer and the wall outlet.

•Check the power cord for continuity.

Is there continuity?

No: Replace the power cord, then turn to TAG 002: Check & Problem Resolution.

Yes: Replace the AC power supply, then turn to TAG 002: Check & Problem Resolution.

28 Disconnect J/P4.

•Check P4-1 for continuity to ground.

Is there continuity?

No: Go to #30 in this TAG.

Yes: Continue.

29 Remove the fuser unit.

•Check P4-1 to J/P44-3 to J5-1 to the fuser unit for continuity to ground.

Is there continuity?

No: Replace the fuser unit, making sure the fuser has the proper voltage rating, then turn to TAG 002: Check & Problem Resolution.

Yes: Repair or replace connectors or wiring that have continuity, then turn to TAG 002: Check & Problem Resolution.

Troubleshooting Analysis Guide (TAGs)

3-123