Step | Cause | Check | Result | Remedy | |
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| Corona wire | Are the electrodes on |
| Clean both electrodes. | |
1 | failure | the drum unit and | Yes |
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| machine body dirty? |
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2 |
| Is the corona wire | Yes | Replace the drum unit. | |
| damaged? |
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| Scanner harness | Is the scanner harness |
| Reconnect the scanner | |
3 | of the laser unit | of the laser unit | No | harness of the laser unit. | |
connection | connected securely? |
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| failure |
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| FG harness | Is the FG harness ASSY |
| Reconnect the FG harness | |
4 | ASSY connection | between the laser unit | No | ASSY between the laser | |
failure | and main PCB ASSY | unit and main PCB ASSY | |||
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| connected securely? |
| securely. | |
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| HVPS PCB | Is the problem solved |
| Replace the HVPS PCB | |
5 | failure | after replacing the | Yes | ASSY. | |
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| HVPS PCB ASSY? |
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| Main PCB failure | Is the problem solved |
| Replace the main PCB | |
6 |
| after replacing the main | Yes | ASSY. | |
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| PCB ASSY? |
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| Laser unit failure | Is the problem solved |
| Replace the laser unit. | |
7 |
| after replacing the laser | Yes |
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| unit? |
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Confidential |