2-74
Confidential
îš„ Faulty registration
îš„ Dark
<User Check>
- Check that the appropriate paper type is selected in the
driver.
Step Cause Remedy
1
Adjusted value of the laser unit is
incorrect.
Refer to "2.1 Entering Adjusted Value of
Laser Unit" in Chapter 4, and enter the
adjusted value of the laser unit again.
2
Registration rear actuator caught in
some sections of the machine
Reattach the registration rear actuator.
3 Laser unit failure Replace the laser unit.
<User Check>
- Check the usage environment of the machine. Using the machine in
high temperature and humidity conditions can cause this problem.
- Clean the corona wire.
- If a new toner cartridge has been set, check whether it was replaced
with a used toner cartridge.
- Adjust the density using the Density Adjustment.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
Step Cause Remedy
1
Dirt on electrodes of the drum unit Clean the electrodes of the drum unit and
those of the machine. (Refer to Fig. 2-10 or
Fig. 2-11.)
2
High-voltage power supply PCB
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.
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