Brother DCP-9045CDN, Service Manual

Page: 72 / 491

Confidential 1-53
Faint print
User Check
- Check that the machine is installed on a level surface.
- Replace the toner cartridge with a new one.
- Clean the scanner windows with a soft cloth.
Step Cause Check
Result
Remedy
1 Laser unit failure Is the problem solved after
replacing the laser unit? Yes Replace the laser unit.
2 Toner empty
sensor failure
Is the “Toner Life End”
message indicated on the
LCD after replacing the
current toner cartridge
with an empty one? No Replace the toner sensor
PCB ASSY (TE/NEW) of
the appropriate color.
White spots on one color image
User Check
- 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.
When the size of the white spots is less than 0.35mm, feed the drum cleaning sheet from the
MP tray one to three times to clean the drum.
(For the procedure, refer to
“Drum Unit Cleaning Mode” in Chapter 5.)
When the size of the spots is 0.35mm or more, or 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
Note in the next pages .)
- The drum unit may be damaged. Replace the drum unit with a new one.
Step Cause Check
Result
Remedy
1 Drum unit failure Are the white spots at
75.0 mm (exposure drum
circumference) intervals? Yes If the exposure drum
surface is scratched,
replace the drum unit.
2 Drum unit
connection failure
Are the electrodes on the
drum unit and machine
body dirty? Yes Clean both electrodes.
3 Transfer HVPS
PCB failure
Is the problem solved after
replacing the transfer
HVPS PCB ASSY? Yes Replace the transfer
HVPS PCB ASSY.
4 Charge HVPS
PCB failure
Is the problem solved
after replacing the charge
HVPS PCB ASSY? Yes Replace the charge
HVPS PCB ASSY.