Problem Cause Solution
Image in a particular color does not print
in the correct color.
Poor contact exists in the primary
charging bias or developing bias
contacts between the print cartridge
and the product.
Clean each contact of the color that produces
the missing color. If the problem remains
after cleaning, check the contacts for
damage. Replace any deformed or damaged
parts.
The print cartridge (primary charging
roller, developing roller, or
photosensitive drum) is defective.
Replace the print cartridge of the color that
matches the defect.
The high-voltage power-supply lower
is defective (no primary charging bias
or developing bias output).
Replace the high-voltage power-supply
lower. See
High-voltage power supply lower
on page 308.
The laser/scanner unit is defective. Replace the laser/scanner assembly. See
Laser/scanner assembly (Y/M) on page 325
or
Laser/scanner assembly (C/Bk)
on page 332.
Dropouts appear. The secondary transfer roller is
deformed or has deteriorated.
Replace the secondary-transfer-roller. See
Secondary transfer roller on page 205.
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 high-voltage power-supply T
PCA is defective (no transfer bias
output).
Replace the high-voltage power-supply
upper. See
High-voltage power supply upper
on page 339.
The toner is not fully fused to the
paper.
The fuser roller or pressure roller is
scarred or deformed.
Replace the fuser. See Fuser on page 200.
The fuser control PCA is defective. Replace the low-voltage power supply. See
Fuser on page 200.
The thermistor is defective. Replace the fuser. See Fuser on page 200.
The fuser heater is defective.
ENWW Solve image-quality problems 497
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