Brother HL-4200CN Service Manual page 289

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Fig.5-26
Condition:
Print is wholly white.
Initial check:
Parts of different specifications, improper installation, damage, deformation, dirt, foreign
substance attached, etc.
Major parts to be checked:
Print head cartridge ASSY, Fuser ASSY, Transfer roll cartridge ASSY, Scanner ASSY,
MCU HL-4200, Toner cartridge
Item Check
Toner empty
1
Check if the toner cartridge is full with toner.
Laser beam path interrupted
Check the laser beam path between scanner ASSY
2
and the drum in print head cartridge ASSY for
evidence of dirt or foreign substances.
Faulty scanner ASSY
3 Is the image quality improved if scanner ASSY is
replaced?
Faulty charging or developing
4 Is the image quality improved if print head cartridge
ASSY is replaced?
Faulty transfer
5 Is the image quality improved if transfer roll
cartridge is replaced?
Faulty MCU HL-4200
6 Is the image quality improved if MCU and HVPS
PW is replaced?
V-83
Remedy
Replace the toner
cartridge
Clean dirt or foreign
substances
Replace the scanner
ASSY
Replace the print head
cartridge ASSY
Replace the transfer roll
cartridge ASSY
Replace the MCU HL-
4200