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Problem Sample Cause Solution
Dropouts appear.
The secondary transfer roller
is deformed or has
deteriorated.
Replace the secondary-transfer-
roller.
The primary charging roller,
developing roller, or
photosensitive drum is
deformed or has deteriorated.
Replace the print cartridge of the
color that matches the defect.
The fuser roller is deformed or
has deteriorated.
Replace the fuser.
The transfer 1 high-voltage
power-supply PCA is defective
(no transfer 1 bias output).
Replace the transfer 1 high-voltage
power-supply.
The transfer 2 high-voltage
power-supply PCA is defective
(no transfer 2 bias output).
Replace the transfer 2 high-voltage
power-supply.
The toner is not fully fused to the
paper.
The fuser roller or pressure
roller is scarred or deformed.
Replace the fuser.
The fuser control circuit is
defective.
Replace the low-voltage power
supply.
The thermistor is defective. Replace the fuser.
The fuser heater is defective.
Some color is misregistered.
The product is incorrectly
calibrated.
Calibrate the product.
The ITB unit is defective. If the ITB does not rotate smoothly or
a cleaning malfunction occurs (ITB is
dirty), replace the ITB.
The drive gear of the ITB
motor is worn or chipped.
Check each drive gear between the
ITB drive roller and the ITB motor. If
the gear is worn or chipped,
replace the drive unit.
The RD sensor is defective. Open and close the right door
several times to clean the RD sensor.
If the problem persists, replace the
RD sensor.
The laser/scanner unit is
defective.
Replace the laser/scanner assembly.
The print cartridge is
defective.
Replace the print cartridge of the
affected color.
528 Chapter 3 Solve problems ENWW