image-quality Troubleshooting
Phaser® 3500 Laser Printer Service Manual
3-8
Black Prints
The prints are completely black,
has no visible image.
■ No charge voltage
■ Power Supply Board
■ Print Cartridge
■ Main board
■ Laser is always ON
1. Verify the high-voltage
contacts are operational and
make good contact with the
print cartridge.
2. Replace in the following
order:
■ Print Cartridge
■ Power Supply Board
■ Main Board
■ Laser Assembly
Dark Image
All areas of the print are too
dark.
■ Incorrect Control Panel
settings
■ Print Cartridge
■ Incorrect high-voltage
outputs (Developer Bias
voltage)
■ Laser assembly
1. Verify Remote Control Panel
setting for the Print Density
menu is not set to "dark.”
2. Verify that the high-voltage
contacts are operational and
make good contact with the
print cartridge.
3. Replace the following in
order:
■ Print Cartridge
■ Power Supply Board
■ Laser assembly
Background Contamination
Uniform toner contamination in
non-image area.
■ Media (paper)
■ Operating environment
■ Print Cartridge
■ Transfer Roller
■ Incorrect High Voltage
outputs
1. Verify that paper meets
printer specifications. Print 20
to 30 pages using
recommended paper. If using
recycled paper, try non-
recycled paper.
2. Printer is installed in specified
environment.
3. Replace Print Cartridge.
4. Inspect Transfer Roller for
contamination and good
electrical contact, replace if
required.
5. Clean the Pre-transfer Lamp.
6. Replace Power Supply Board.
Image Defect Possible Causes Solutions
s3500-045
s3500-046
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