- HP Printer User Manual

Troubleshooting Analysis Guide (TAGs) 3-119
4 Does the PRINTER OPEN light come on with all the covers closed?
No: Go to #25 in this TAG.
Yes: Continue.
5 Operate the top and front cover interlock switch actuators.
Are the interlock switch actuators working properly?
No: Repair or replace any defective actuator, then turn to TAG 002: Check & Problem Reso-
lution.
Yes: Continue.
6 Use extreme caution: Check from J/P4-4 to J/P4-3 for +100 Vac.
Is the voltage +100 Vac?
No: Continue.
Yes: Repair or replace the connectors or wiring from: P9-2 to P4-4 or P9-1 to P4-3. If this is a
duplex printer and the problem remains, go to TAG 900: Top Cover Interlock Malfunc-
tion, Duplex. If this corrects the problem, turn to TAG 002: Check & Problem Resolu-
tion.
7 Turn the printer off and unplug the power cord.
• Remove the upper fuse in the AC power supply unit.
• Check the fuse for continuity.
Does the fuse have continuity?
No: Continue.
Yes: Go to #10 in this TAG.
8 Replace the upper fuse in the AC power supply unit.
• Reconnect the power.
• Power-on-reset the printer.
Was the power-on-reset successful?
No: Go to #14 in this TAG.
Yes: Continue.
9 Remove the developer unit.
• Run diagnostic test 010 for approximately 5 seconds, then stop.
• Turn the printer off and unplug the power cord.
• Remove the fuse.
• Check the fuse for continuity.
Does the fuse have continuity?
No: Go to #12 in this TAG.
Yes: A defective fuse was at fault. Turn to TAG 002: Check & Problem Resolution.