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Eng
Brother MFC9440CN
Troubleshooting. Image Defect. Completely blank, Image distortion
Completely blank
User Check
- Replace the toner cartridge or drum unit with a new one.
Step |
Cause |
Check |
Result |
Remedy |
1 |
Developing bias voltage conduction failure |
Are the electrodes on the drum unit and machine body dirty? |
Yes |
Clean both electrodes. |
2 |
Scanner harness connection failure |
Is the scanner harness connected securely? |
No |
Reconnect the scanner harness. |
3 |
Engine PCB failure |
Is the problem solved after replacing the engine PCB ASSY? |
Yes |
Replace the engine PCB ASSY. |
4 |
Laser unit failure |
Is the problem solved after replacing the Laser unit? |
Yes |
Replace the laser unit. |
5 |
Transfer HVPS PCB failure |
Is the problem solved after replacing the transfer HVPS PCB ASSY? |
Yes |
Replace the transfer HVPS PCB ASSY. |
6 |
Charge HVPS PCB failure |
Is the problem solved after replacing the charge HVPS PCB ASSY? |
Yes |
Replace the charge HVPS PCB ASSY |
Image distortion
Step |
Cause |
Check |
Result |
Remedy |
1 |
Laser unit not assembled correctly |
Is the laser unit assembled into the machine securely? (Check if there is no gap.) |
No |
Assemble the laser unit correctly and secure the screw |
2 |
Incorrect radiation angle of scanner diode Scanner motor rotation failure |
Is the problem solved after replacing the laser unit? |
Yes |
Replace the laser unit. |