Xerox Phaser 4500 Service Manual page 232

Print-Quality Troubleshooting
5-16
Light Prints Troubleshooting Procedure (continued)
Step Actions and Questions
1. Reform or clean the metal
4
contacts so they make better
contact with the print cartridge.
Ensure that they are pressed
firmly into their plastic
mounting pins, and bent
outward (not flat).
2. Print a test print.
Does the image density meet
specifications?
Check for continuity between the
5
metal grounding contact (the
upper contact that has double
fingers) and the printer body
frame.
Is there continuity between the
metal grounding contact and the
printer frame?
6 Inspect the laser beam path
between the Laser Assembly and
the drum for obstructions.
Is the laser beam path free of
obstructions?
7 Is the transfer roller intact and
free of contamination?
8 1. Generate a test print and switch
printer power OFF 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?
Inspect the toner image on the
9
drum immediately after the
transfer area (transfer roller).
Is the toner image on the drum
transferred completely to the
paper?
10 Replace in order until the problem
is solved:
HVPS/Engine Logic PWB
(page 8-73)
Laser Assembly (page 8-38)
Transfer roller (page 8-45)
Yes No
Problem solved. Go to step 5.
Go to step 6. Replace the print
cartridge right guide
(page 8-47).
Go to step 7. Clean the laser
window and remove
any obstructions
from the laser beam
path.
Go to step 8. Replace the transfer
roller (page 8-45).
Go to step 9. Go to "HVPS/Engine
Logic Board" on
page 4-32.
Go to step 10. Go to "HVPS/Engine
Logic Board" on
page 4-32.
Phaser 4500/4510 Service Manual