Table 2-77 Image defects table (continued)
Problem Sample 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 toner 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 toner cartridge (primary
charging roller, developing
roller, or photosensitive drum)
is defective.
Replace the toner 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.
The laser/scanner unit is
defective.
Replace the laser/scanner
assembly.
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 toner cartridge.
The fuser roller is deformed
or has deteriorated.
Replace the fuser.
The high-voltage power-
supply PCA is defective (no
transfer bias output).
Replace the 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 fuser PCA.
The thermistor is defective. Replace the fuser.
The fuser heater is defective.
ENWW Solve image quality problems 715
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