Konica-Minolta bizhub C3851
Troubleshooting. Do not display the trouble code
Machine is not energized at all (DCPU operation check)
Relevant electrical parts
• Power switch (SW1)
• MFP board (MFPB)
• DC power supply (DCPS)
Procedure
| Step | Check item | Location | Result | Action |
|---|---|---|---|---|
| 1 | Is a power voltage supplied across CN1 on DCPS? | 17-U | NO | Check the wiring from the wall outlet to inlet to SW1 to DCPS CN1. |
| 2 | Are DC5.1 V being output from CN2E on MFPB? | 3-H | NO | • Check the wiring from the DCPS CN5 to MFPB CN2E. • Replace DCPS. |
| 3 | Is DC24 V being output from CN3E on MFPB? | 4-H | NO | Check the wiring from the DCPS CN4 to MFPB CN3E. |
| 4 | Is DC24 V being output from CN3E-6 on MFPB? | 4-H | YES | Replace MFPB. |
| 5 | Check the wiring from the MFPB CN3E to DCPS CN4. | YES | Reconnect. | |
| NO | Replace MFPB. |
Operation panel indicators do not light
Relevant electrical parts
• MFP board (MFPB)
• Operation panel
• DC power supply (DCPS)
Procedure
| Step | Check item | Location | Result | Action |
|---|---|---|---|---|
| 1 | Is a power voltage supplied across CN1 on DCPS? | 17-U | NO | Check the wiring from the wall outlet to inlet to SW1 to DCPS CN1. |
| 2 | Are the fuses on DCPS conducting? | NO | Replace DCPS. | |
| 3 | Is CN3 on MFPB properly connected? | 25-H | NO | Reconnect. |
| 4 | Is CN2E, CN3E on MFPB properly connected? | 3 to 4-H | NO | Reconnect. |
| YES | • Replace MFPB. • Replace the scanner unit. • Replace the operation panel. |
Fusing heaters do not operate
Relevant electrical parts
• Front door switch (SW2)
• Right door switch (SW3)
• Fusing unit
• DC power supply (DCPS)
• MFP board (MFPB)
Procedure
| Step | Check item | Location | Result | Action |
|---|---|---|---|---|
| 1 | Is the power source voltage applied across CN1 on DCPS? | 17-U | NO | Check the wiring from the wall outlet to inlet to SW1 to DCPS CN1. |
| 2 | Is the power source voltage applied across CN3 on DCPS? | 18-S | YES | Replace fusing unit. |
| NO | • Check the wiring from the DCPS CN3 to MFPB CN1E. • Replace DCPS. • Replace MFPB. |
Operation panel (touch panel) do not respond
Relevant electrical parts
• Operation panel (OP)
• eMMC board (eMMC)
Procedure
- To perform calibration of the operation panel.
- Replace eMMC.
- To perform calibration of the operation panel again.
- If the above actions do not solve the problem, replace the operation panel.
Output tray full indication does not disappear bizhub C3851FS
Relevant electrical parts
• Output tray paper holding motor (FSM6)
• Output tray full sensor (FSPS6)
• FS control board (FSCB)
Procedure
| Step | Check item | Control signal | Location |
|---|---|---|---|
| 1 | Check the connector between FSM6-relay CN39-FRCB CN9 for proper connection and correct as necessary. | ||
| 2 | Check the connector of FSM6 for proper drive coupling, and correct as necessary. | ||
| 3 | Check the connector between FSPS6-relay CN39- FRCB CN9 for proper connection and correct as necessary. | ||
| 4 | FSPS6I/O check, sensor check | FSCB CN9-8 | 24-W |
| 5 | FSM6 operation check | FSCB CN9-12 to13 | 25-W |
| 6 | Replace FSM6 | ||
| 7 | FSCB PTC1 conduction check | ||
| 8 | Replace FSCB |