DarkUser Check
-Check the machine’s environment. High temperature and high humidity conditions can cause this problem.
-Replace the toner cartridge or drum unit with a new one.
-Implement calibration from the control panel.
Step | Cause | Check | Result | Remedy |
1 | Corona wire | Are the electrodes on the | Yes | Clean both electrodes. |
| conduction failure | drum unit and machine |
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| body dirty? |
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2 | Dirt on belt unit | Are the electrodes on the | Yes | Clean both electrodes. |
| electrode | belt unit and machine |
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| body dirty? |
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3 | Transfer HVPS | Is the problem solved | Yes | Replace the transfer |
| PCB failure | after replacing the transfer |
| HVPS PCB ASSY. |
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| HVPS PCB ASSY? |
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4 | Charge HVPS | Is the problem solved | Yes | Replace the charge |
| PCB failure | after replacing the charge |
| HVPS PCB ASSY. |
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| HVPS PCB ASSY? |
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5 | Engine PCB | Is the harness connected | Yes | Replace the engine PCB |
| failure | between the HVPS PCB |
| ASSY. |
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| and engine PCB |
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| correctly? |
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Poor fixingUser Check
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one. - Implement calibration from the control panel.
Step | Cause | Check | Result | Remedy |
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1 | Fuser unit failure | Is the problem solved | Yes | Replace the fuser unit. |
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| after replacing the fuser |
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| unit? |
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2 | Is the problem solved | Yes | Replace the PS PCB unit. | |
| power supply PCB | after replacing the PS |
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| failure | PCB unit? |
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3 | Transfer HVPS | Is the problem solved | Yes | Replace the transfer |
| PCB failure | after replacing the transfer |
| HVPS PCB ASSY. |
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| HVPS PCB ASSY? |
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4 | Charge HVPS | Is the problem solved | Yes | Replace the charge |
| PCB failure | after replacing the charge |
| HVPS PCB ASSY. |
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| HVPS PCB ASSY? |
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5 | Engine PCB | Is the problem solved | Yes | Replace the engine PCB |
| failure | after replacing the engine |
| ASSY. |
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| PCB ASSY? |
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Confidential |