HP C30 manual Is there continuity on all?, Does the voltage change from +24 Vdc to 0 Vdc?

9 Turn the printer off and unplug the power cord.

•Disconnect J/P40 and J/P57.

•Check the following for continuity:.

P40-16 to P57-2

P40-25 to P57-1

P40-12 to P57-3

Is there continuity on all?

No: Repair or replace the connectors or wiring from P40-25 to J/P58-1 to P57-1, P40-16 to J/ P58-2 to P57-2, or P40-12 to J/P58-3 to P57-3. Then turn to TAG 002: Check & Problem Resolution.

Yes: Replace the paper timing guide. If this does not resolve the problem, replace the PCL board. Then turn to TAG 002: Check & Problem Resolution.

10 Turn the printer off.

•Open the back cover and install an interlock by-pass tool.

•Remove the paper feed cover to expose the upper paper pick roller assembly.

Warning

To avoid the risk of injury, use extreme caution as gears

and belts are exposed

•Run diagnostic test 006, testing the upper pick-up roller clutch.

•Check TP3-9 for a voltage change from +24 Vdc to 0 Vdc.

Does the voltage change from +24 Vdc to 0 Vdc?

No: Continue.

Yes: Go to #12 in this TAG.

11 Turn off the printer and unplug the power cord.

•Disconnect J/P40 and J/P68.

•Check P40-9 to J68-2 and P40-11 to J68-1 for continuity.

Is there continuity?

No: Repair or replace the connectors or wiring from P40-9 to J68-2 or P40-11 to J68-1. Then turn to TAG 002: Check & Problem Resolution.

Yes: Replace the upper pick-up roller assembly, then turn to TAG 002: Check & Problem Res- olution.

12 Run diagnostic test 006, testing the upper feed roller clutch.

•Check TP3-6 for a voltage change from +24 Vdc to 0 Vdc.

Does the voltage change from +24 Vdc to 0 Vdc?

No: Continue.

Yes: Go to #14 in this TAG.

3-28 Troubleshooting Analysis Guide (TAGs)