Xerox Phaser 4500 Service Manual page 254

Spots Troubleshooting Procedure
Step Actions and Questions
1 1. Install a new Print Cartridge.
2. Print a test print.
Are the spots gone?
2
Inspect the Transfer Roller Assembly
for contamination and wear.
Is the Transfer Roller free of
contamination and wear?
3 1. Generate a test print and switch
OFF the printer power halfway
through the print cycle.
2. Carefully remove the Print
Cartridge and inspect the toner
image on the drum just before the
transfer area (Transfer Roller).
Is the image on the drum
completely developed with sharp,
black, easy-to-read areas and no
spots?
4 1. Open the Rear Cover.
Warning:
to cool before removing.
2. Remove the Fuser Assembly.
3. Manually rotate the fuser drive
gear and inspect the Heat Roller.
4. Open fuser jam access cover.
5. Manually rotate the fuser drive
gear and inspect the Pressure
Roller.
Are the Heat Roller and the
Pressure Roller free of surface
defects and contamination?
5 Replace the following, in order, until
the defective component is found:
Transfer Roller Assembly
(page 8-55)
Fuser Assembly (page 8-54)
HVPS Engine Logic PWB
(page 8-89)
Laser Assembly (page 8-46)
Print-Quality Troubleshooting
Allow the Fuser Assembly
Yes
Problem solved.
Go to step 3.
Go to step 4.
To to step 5.
No
Go to step 2.
Replace the Transfer
Roller Assembly
(page 8-55).
Go to High-Voltage
Power Supply (HVPS)
Assembly (page 4-35).
Replace the Fuser
Assembly (page 8-54).
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