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Brother MFC7895DW
Troubleshooting. Image defect 5
Downward fogging of solid color
User Check
• Replace the toner cartridge with a new one.
Step |
Cause |
Remedy |
1 |
High-voltage power supply PCB failure |
Replace the high-voltage power supply PCB ASSY. |
2 |
Main PCB failure |
Replace the main PCB ASSY. |
Horizontal lines
User Check
- This problem may disappear after printing multiple sheets of paper.
- Refer to <How to clean the drum unit> to remove the dirt from the exposure drum using a cotton applicator.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
Step |
Cause |
Remedy |
1 |
Dirty charge electrodes |
Clean the electrodes of the drum unit and those of the machine. |
2 |
Dirt on the exposure drum |
Perform drum cleaning. |
3 |
Scratch or dirt on the fuser unit |
Replace the fuser unit. |
4 |
High-voltage power supply PCB failure |
Replace the high-voltage power supply PCB ASSY. |
Ghost
User Check
- Check the usage environment of the machine. Using the machine in hot-humid or cold-dry conditions can cause this problem.
- Check whether appropriate paper type is selected on the driver.
- Select “Improve Toner Fixing” in the driver.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
Step |
Cause |
Remedy |
1 |
Scratch or dirt on the fuser unit, or conductive leaf spring deformation |
Replace the fuser unit. |
2 |
High-voltage power supply PCB failure |
Replace the high-voltage power supply PCB ASSY. |
Fogging
User Check
- Check the usage environment of the machine. Using the machine in hot-humid or cold-dry conditions can cause this problem.
- Check if the acid paper is not used.
- This problem may disappear after printing multiple sheets of paper.
- Replace the toner cartridge with a new one.
- Replace the drum unit with a new one.
Step |
Cause |
Remedy |
1 |
Dirt on the electrodes of the toner cartridge and those of the machine |
Clean the electrodes of the toner cartridge. |
2 |
New toner sensor PCB failure |
Replace the new toner sensor PCB ASSY. |
3 |
High-voltage power supply PCB failure |
Replace the high-voltage power supply PCB ASSY. |
4 |
Main PCB failure |
Replace the main PCB ASSY. |
Note:
This problem tends to occur when the life of the drum unit or toner cartridge is expiring.