HP LaserJet M72625 MFP

Symptom

Paper stops between the document feeder roller and the registration roller of the document feeder and a paper jam occurs.

Cause

All 24V channels output voltage is off (24V output voltage is nearly 0V) and 5V channels output is normal.

Troubleshooting

1. Check all 24V output channels (24VS1, 24VS2, 24VS3, 24VS4) to determine whether 24V voltage comes out.
2. If 24V voltage does not come out, check ‘24V on/off signal pin’ on the main board.
   a. If the voltage at ‘24V on/off signal pin’ is 0V, then the main board and signal is normal.
   b. If the voltage at ‘24V on/off signal pin’ is between 4V and 5.3V, then the main board and signal is not normal.
3. If the main board and signal is normal and all 24V output channels are nearly 0V, check other parts (i.e., fuser, motor, scanner harness, etc.) driven by 24V voltage before replacing the SMPS.
4. If the main board and signal is normal and just one or two 24V output channels are nearly 0V, inspect the harness from the abnormal 24V output channel before replacing the SMPS.
5. If the main board and signal is abnormal and all 24V output channels are nearly 0V, inspect the harness, connector, and main board.