HP C30 manual Does the voltage change to 0 Vdc?, Is a meter with a high voltage probe available?

15 Turn the printer off and unplug the power cord.

•Disconnect J/P41, J/P24, and J/P23.

•Check the following for continuity: P41-30 to J24-4,

P41-38 to J23-2,

P41-43 to J25-5,

P41-44 to J25-2,

P41-47 to J25-3,

P41-48 to J25-6,

P41-49 to J25-4, and

P41-50 to J25-1.

Is there continuity on all?

No: Repair or replace the connectors or wiring that do not have continuity, then turn to TAG 002: Check & Problem Resolution.

Yes: Continue.

16 Reconnect J/P23, J/P41, and J/P24.

•Reinstall the developer unit.

•Power-on-reset the printer.

•Check TP4-30 for +24 Vdc for one minute.

Is the voltage +24 Vdc for the first minute after power-on-reset?

No: Replace the high voltage unit, then turn to TAG 002: Check & Problem Resolution.

Yes: Continue.

17 Run test prints.

•Check TP4-30 for 0 Vdc while running the prints.

Does the voltage change to 0 Vdc?

No: Replace the PCL board, then turn to TAG 002: Check & Problem Resolution.

Yes: Continue.

18 Is a meter with a high voltage probe available?

No: Go to #24 in this TAG.

Yes: Continue.

19 Power-on-reset the printer.

•Run test prints.

•Using a high voltage probe, check J/P25-7 for the proper voltage, as outlined in Chapter 9, “General Printer Maintenance” .

Is the voltage correct?

No: Replace the high voltage unit, then turn to TAG 002: Check & Problem Resolution.

Yes: Go to #25 in this TAG.

Troubleshooting Analysis Guide (TAGs) 3-155