■Completely blank
<User Check>
-Replace the drum unit with a new one.
-Replace the toner cartridge with a new one.
Step | Cause | Check | Result | Remedy |
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| Developing bias | Are the electrodes on |
| Clean both electrodes. |
1 | voltage | the drum unit and | Yes | |
conduction | machine body dirty? |
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| failure |
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| Scanner harness | Is the scanner harness |
| Reconnect the scanner |
2 | 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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| Laser unit failure | Is the problem solved |
| Replace the laser unit. |
3 |
| after replacing the laser | Yes |
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| unit? |
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| HVPS PCB | Is the problem solved |
| Replace the HVPS PCB |
4 | 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 |
5 |
| after replacing the main | Yes | ASSY. |
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| PCB ASSY? |
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■Image distortion
Step | Cause | Check | Result | Remedy |
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| Laser unit not | Is the laser unit |
| Assemble the laser unit |
| assembled | assembled into the |
| correctly and secure the |
1 | correctly | machine securely? | No | screw. |
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| (Check if there is no |
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| gap.) |
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| Incorrect | Is the problem solved |
| Replace the laser unit. |
| radiation angle of | after replacing the laser |
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2 | scanner diode of | unit? | Yes |
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laser unit. |
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| Scanner motor |
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| rotation failure |
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| Main PCB failure | Is the problem solved |
| Replace the main PCB |
3 |
| after replacing the main | Yes | ASSY. |
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| PCB ASSY? |
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Confidential |