Brother DCP-9045CDN Service Manual page 41

Error code 7D
Drum Error
Slide the Green tab on Drum Unit in each color. Refer to the User's
Guide for the procedures.
Dirt on drum unit
User Check
- Clean the corona wire in the drum unit.
- Replace the drum unit with a new one.
Step
1 Dirt or dust on drum unit
electrodes
2 Charge HVPS PCB failure
3 Engine PCB failure
Error code 82
Calibrate
Calibration failed. Press start, and try again.
Density patch measurement is not completed normally when implementing calibration from the
control panel.
User Check
- Check if there is a scratch, dirt or the like on the belt unit. If there is, replace the belt unit
with a new one.
- Check if the genuine toner cartridges are installed in the correct order of colors.
Step
1 Density sensor shutter not
operating smoothly or
catching in some position
2 Harness connection failure of
density sensor holder ASSY
3 Density sensor failure
4 Transfer HVPS PCB failure
5 Engine PCB failure
Cause
Clean the electrodes of the main body and the
drum unit. (Refer to
Replace the charge HVPS PCB ASSY.
Replace the engine PCB ASSY.
Cause
Correct smooth operation of the density sensor
shutter.
Check the harness connection of the density
sensor holder ASSY and reconnect it.
Replace the density sensor holder ASSY.
Replace the transfer HVPS PCB ASSY.
Replace the engine PCB ASSY.
1-22
Remedy
Fig. 1-1 (P1-37).)
Remedy
Confidential