| Step |
Check description |
Assumed cause |
Measures |
| 1 |
Measuring the input voltage |
The power cord has no continuity. |
Plug the power cord into another wall outlet. |
| 2 |
Checking the power cord |
The power plug of the power cord is faulty. |
If the power plug is deformed or faulty, replace the power cord. |
| 3 |
Checking the power cord |
The power cord is faulty. |
If there is no continuity of the power cord, replace the power cord. |
| 4 |
Checking the main power switch |
The main power switch is faulty. |
Check the continuity between the contacts of the main power switch, and replace the main power switch if there is no continuity. |
| 5 |
Checking the low voltage PWB |
The connector is not connected properly. The wire or the PWB is faulty. |
Clean the terminal of the connectors on the low voltage PWB, then reconnect the wire connector. If the wire is faulty, repair or replace it. If not repaired, replace the low voltage PWB. |
| 6 |
Replacing the power switch |
The power switch is faulty. |
Check the power switch. Replace it if there is no continuity. |
| 7 |
Checking the engine PWB |
The connector or FFC terminal is not connected properly. Or, the wire, FFC, PWB is fault |
Check if the 10th pin of connector YC29 on the engine PWB generates 24V. When it does not generate 24V, clean a the terminals of the connector on the engine PWB and reinsert the wire connector and the FFC terminal. If the wire or FFC is faulty, repair or replace it. If not repaired after that, replace the engine PWB. |
| 8 |
Checking the main PWB |
The connector or FFC terminal is not connected properly. Or, the wire, FFC, PWB is faulty |
Clean the terminal of the connectors on the main PWB, then reconnect the wire connector and reconnect the FFC terminal. If the wire or the FFC is faulty, repair or replace it. If not repaired, replace the main PWB. |
| Step |
Check description |
Assumed cause |
Measures |
| 1 |
(For 35ppm or faster models) Reaffixing the toner scattering prevention seal on the primary transfer unit |
Scattering prevention sheet is peeling off. |
Re-affix the scattering prevention sheet on the primary transfer unit. |
| 2 |
Checking the developer and drum units |
The developer unit or the drum unit is dirty. |
Clean the developer unit and the drum unit. |
| 3 |
Firmware upgrade |
The firmware is not latest version. |
Upgrade the firmware to the latest version. |
| 4 |
Executing Developer refresh |
The amount of toner in the developer unit is large. Or, the toner is deteriorated. |
Execute the developer refresh twice. |
| 5 |
Developer unit replacement |
The toner is deteriorated. |
Replace the developer unit. |