One Color Spots Or Dirt; One Color Band - Brother DCP-9045CDN Service Manual

One color spots or dirt

User Check
- Damp (wet) paper might be used. Try changeing to freshly unopened paper.
- Toner may be empty. Replace the toner cartridge with a new one.
- If the same problem occurs after printing a few pages, the adhesive of a label or the like,
paper powder or dirt may be attached on the surface of the exposure drum.
Feed the drum cleaning sheet from the MP tray one to three times to clean the drum.
(For the procedure, refer to
When the same problem occurs after feeding the drum cleaning sheet, wipe off the dirt on the
exposure drum with a cotton swab.
(For the procedure, refer to
- The drum unit may be damaged. Replace the drum unit with a new one.
Step Cause
1 Drum unit failure
2 Drum unit
connection failure
3 Fuser unit failure
4 Transfer HVPS
PCB failure
5 Charge HVPS
PCB failure

One color band

User Check
- Clean the inside of the machine and the corona wire in the drum unit. If the same problem
occurs after cleaning, replace the drum unit with a new one.
- The paper tray ground terminal provided in the machine body may be dirty. Clean the contact
with a dry cloth.
"Drum Unit Cleaning Mode"
Note in the previous pages.)
Check
Are the spots at 75.0 mm
(exposure drum
circumference) intervals?
Are the electrodes on the
drum unit and machine
body dirty?
Are the spots at 78.5mm
(heat roller
circumference) intervals?
Is the problem solved after
replacing the transfer
HVPS PCB ASSY?
Is the problem solved
after replacing the charge
HVPS PCB ASSY?
1-56
in Chapter 5.)
Remedy
Result
Yes If the surface of the
exposure drum is
scratched, replace the
drum unit.
Yes Clean both electrodes
Yes Replace the fuser unit.
Yes Replace the Transfer
HVPS PCB ASSY.
Yes Replace the charge
HVPS PCB ASSY.
Confidential