Brother MFC9450CDN
Troubleshooting. Image Defect. Diameter of Rollers, Light on the whole page
Diameter of Rollers
Image defects which appear periodically may be caused by failure of a roller. Specify the cause referring to the diameters of the rollers or pitch which appears in the image as shown in the table below.
No. | Parts name | Diameter | The pitch which appears in the image |
---|---|---|---|
1 | Develop roller | Ø 20.0 mm | 37.4 mm |
2 | Exposure drum | Ø 24.0 mm | 75.0 mm |
3 | Heat roller in the fuser unit | Ø 25.0 mm | 78.5 mm |
4 | Pressure roller ASSY in the fuser unit | Ø 25.0 mm | 78.5 mm |
Light on the whole page
User Check
- Check the machine’s environment. High temperature and high humidity conditions can cause this problem.
- If the whole page is light, toner save mode may be on.
- Replace the toner cartridge or drum unit with a new one.
- Implement calibration from the control panel.
Step | Cause | Check | Result | Remedy |
---|---|---|---|---|
1 | Transfer HVPS PCB failure | Is the transfer HVPS PCB ASSY connected correctly? | Yes | Replace the transfer HVPS PCB ASSY. |
2 | Engine PCB failure | Is the harness between the HVPS PCB and engine PCB connected correctly? | Yes | Replace the engine PCB ASSY. |
3 | Charge HVPS PCB failure | Is the harness of the HVPS PCB connected correctly? | Yes | Replace the charge HVPS PCB ASSY. |
4 | Laser unit failure | Is the problem solved after replacing the laser unit? | Yes | Replace the laser unit. |