Konica-Minolta bizhub 958
Troubleshooting. Do not dsplay trouble code
1 Machine is not energized at all (DCPU operation check)
Machine is not energized at all
Relevant electrical parts
• Main power switch (SW1)
• MFP board (MFPB)
• DC power supply unit (DCPU)
| Step | Check item | Location | Result | Action |
|---|---|---|---|---|
| 1 | Is a power voltage supplied across CN001-1 and 2 on DCPU? | 26-K to L | NO | Check the WIRING from the wall outlet to SW1 to CN1. |
| 2 | Are the fuses on DCPU conducting? | NO | Replace DCPU | |
| 3 | Is DC5 V being output to CN006-5 to 8 on DCPU? | 26-I to J | NO | Replace DCPU |
| 4 | Is DC24 V being output to CN007-3 on DCPU? | 26-I to J | NO | • Check the WIRING from the wall MFPB to DCPU. • Replace DCPU • Replace MFPB |
| 5 | The LED5 on MFPB is blinking? | NO | Replace MFPB | |
| 6 | Is DC24 V being output to CN007-1 on DCPU? | 26-I to J | Replace DCPU |
2 Power is not supplied to DF
| Step | Check item | Location | Result | Action |
|---|---|---|---|---|
| 1 | Is DC24 V being output from CN1 on DF? | 27-M | YES | Malfunction in DF |
| 2 | Is DC24 V being output to CN004-1 on DCPU? | 27-K to L | NO | Check wiring from DCPU to DF. |
| 3 | Is the fuse on DCPU conducting? | YES | Replace DCPU. | |
| NO | Malfunction in DF |
3 Power is not supplied to LU-205/LU-303
| Step | Check item | Location | Result | Action |
|---|---|---|---|---|
| 1 | Is DC24 V being applied to relay connector CN425? | 11-W | NO | Malfunction in LU-205/LU-303. |
| 2 | Is DC24 V being output from CN20 on PFTDB? | 11-U | NO | Check wiring from PFTDB CN20 to LU-205/LU-303. |
| 3 | Is the fuse on DCPU conducting? | YES | Replace DCPU. | |
| NO | Malfunction in LU-205/LU-303. |
4 Power is not supplied to FS-536/FS-536SD/FS-537/FS-537SD
| Step | Check item | Location | Result | Action |
|---|---|---|---|---|
| 1 | Is DC24 V being applied to CN1-3? | 27-K to L | NO | Malfunction in finisher. |
| 2 | Is DC24 V being output to CN004-5 on DCPU? | 27-M | NO | Check wiring from DCPU to finisher. |
| 3 | Is the fuse on DCPU conducting? | YES | Replace DCPU. | |
| NO | Malfunction in finisher. |
5 MFP does not start
| Step | Check item | Location | Result | Action |
|---|---|---|---|---|
| 1 | Check whether trouble occurs and the message saying that MFP attempts to restore backup data appears. | YES | Attempt to restore backup data. | |
| 2 | Rewrite the firmware and check whether that works. | NO | Replace the MFP board. | |
| 3 | Check whether replacing the MFP board works. | NO | Contact the responsible people of KM before taking some countermeasures. |