- HP Printer User Manual

Troubleshooting Analysis Guide (TAGs) 3-123
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.