Service manual

2-82
Confidential
■ Faulty registration
■ Dark
User Check
• Check that the appropriate media type is selected in the
driver.
Step Cause Remedy
1
Adjusted value of the laser unit
mistake
Refer to
"2.1 Inputting the Adjusted Value of
the Laser Unit" in Chapter 4
, and enter the
adjusted value of the laser unit again.
2
Registration rear actuator catching
on some position
Correct catching of the registration rear
actuator.
User Check
• Check the machine's environment. High temperature and high
humidity or low temperature and low humidity conditions can cause
this problem.
• Adjust the density by the Density Adjustment.
• Clean the corona wire of drum unit.
• Replace the drum unit with a new one.
• Replace the toner cartridge with a new one. If remove the used
toner cartridge and replace a relatively new used toner cartridge,
this case is caused.
Step Cause Remedy
1
Dirt on the electrodes of the drum
unit and the machine body
Clean the electrodes of the drum unit and
machine body. (Refer to Fig. 2-11, Fig. 2-
12.)
2
High voltage power supply PCB
ASSY failure
Replace the high voltage power supply
PCB ASSY.
3 Laser unit failure Replace the laser unit.
4 Main PCB failure Replace the main PCB ASSY.