HP C30 Is the circuit board or mounting contaminated or damaged?, Is there a wiring problem?

5 Remove the lower paper size sensor assembly.

•Disconnect the circuit board from its mounting.

•Inspect the paper size sensor circuit board and mounting for contamination or damage.

Is the circuit board or mounting contaminated or damaged?

No: Continue.

Yes: Repair or replace the lower paper size sensor assembly, then turn to TAG 002: Check & Problem Resolution.

6 Is the paper size sensing problem occurring with the upper cassette?

No: Go to #8 in this TAG.

Yes: Continue.

7 Turn the printer off and unplug the power cord.

•Disconnect J/P40 and J/P45.

•Refer to the tables at the end of this TAG.

•Check the connectors or wiring for the upper paper size sensor.

Is there a wiring problem?

No: Replace the upper paper size sensor assembly. If this resolves the problem, turn to TAG

002:Check & Problem Resolution. If this does not resolve the problem, replace the PCL board, then turn to TAG 002: Check & Problem Resolution.

Yes: Repair or replace the connectors or wiring that are defective, then turn to TAG 002: Check & Problem Resolution.

8 Turn the printer off and unplug the power cord.

•Disconnect J/P40 and J/P43.

•Refer to the table at the end of this TAG.

•Check the connectors or wiring for the lower paper size sensor.

Is there a wiring problem?

No: Replace the lower paper sensor assembly. If this resolves the problem, turn to TAG 002: Check & Problem Resolution. If this does not resolve the problem, replace the PCL board, then turn to TAG 002: Check & Problem Resolution.

Yes: Repair or replace the connectors or wiring that are defective, then turn to TAG 002: Check & Problem Resolution.

Troubleshooting Analysis Guide (TAGs) 3-133