image-quality Troubleshooting
Phaser® 3500 Laser Printer Service Manual
3-9
Ghosting
Image from the previous page 
prints on consecutive pages.
.
■ Operating environment
■ Media (paper)
■ Print Cartridge
■ Transfer Roller
■ Fuser assembly
■ Incorrect high-voltage 
outputs.
1. Printer is installed in specified 
environment?
2. Verify that paper meets 
printer specifications. Print 20 
to 30 pages using 
recommended paper.
3. Determine ghosting pitch and 
replace the corresponding 
assembly.
NOTE: See Repeating 
Defects on page 3-3 for defect 
pitch.
4. Replace Power Supply Board.
Non-Uniform Image
The Line darkness and solid-
area density image vary across 
the print.
.
■ Print Cartridge
■ Print Cartridge grounding
■ Unstable high voltage 
output
■ Transfer Roller 
contamination
■ Laser Window or optic 
contamination
1. Ensure that Cartridge is not 
out of toner. Inspect Drum for 
deterioration or 
contamination.
2. If defective, replace the Print 
Cartridge. 
3. Verify Print Cartridge ground. 
Check continuity between 
cartridge ground contact and 
frame ground. Ensure that 
drum contact is clean and 
undamaged.
4. Inspect the Transfer Roller 
spring tension and bearing 
contacts.
5. Remove Laser assembly, 
clean window, or replace 
assembly as necessary.
6. Replace Power Supply Board.
Image Defect Possible Causes Solutions
s3500-047
s3500-04