OKI MPS4700
Troubleshooting. Abnormal MFP operation after powered on. Abnormal sound
| Check item | Checking | Action in case of fail |
|---|---|---|
| Checking for loss of synchronization of motor (driver failure) | ||
| Operation of each motor | Check whether each motor operates properly using the selfdiagnosis mode. Check by detection of a load. Noise that sounds like "pooh" is made when there is a fault. |
Replace CU/PU board (MRM) and SU board (MSU). |
| Condition of each motor cable | Check the wiring of each motor. Check for a short circuit by visual check and using a tester. Disconnect the motor cable from the PCB and check the resistance between the FG and each pin of the disconnected cable. |
Replace the motor cable. Correct the wiring. |
| Checking for loss of synchronization of motor (load by consumables) | ||
| Operation of each motor | Check whether each motor operates properly using the selfdiagnosis mode. Check by detection of a load. Noise that sounds like "pooh" is made when there is a fault. |
Replace the consumable(s). When testing with a new consumable part, use the fuse keep mode on the system maintenance menu. |
| Check for gear jumping (load by consumables) | ||
| Operation of each motor | Check whether each motor operates properly using the selfdiagnosis mode. Check by detection of a load. Noise that sounds like "batz batz" is made when there is a fault. |
Replace the consumable(s). When testing with a new consumable part, use the fuse keep mode on the system maintenance menu. |
| Position of consumables | Check visually whether each consumable gear is in place and they engage with one another. | Replace or repair mechanical part(s). |
| Checking cable wiring | ||
| Cable wiring around cooling fans | Check whether a cable touches the blades of a fan as the cable is not properly laid. When it does, noise that sounds like "clack clack" is made. |
Lay the cable properly. |