Xerox Phaser 7100

Image Quality
Phaser 7100 Service Manual Xerox Internal Use Only3-18
4. Check the charged state of the Drum.
Use paper to cover the whole Laser Unit window
and resend a print job.
Is the print solid black?
Note: If the Drum is charged normally, a fully
white printout will be printed.
Replace the HVPS1
PWB (REP 12.13
HVPS1 PWB on
page 4-221).
Go to step 5.
5. Check the Laser Unit.
Use paper to cover half of the Laser Unit window
and resend a print job.
Is the printout half white and half black?
Note: If the Laser Unit is normal, the half will
have the test pattern printed on it instead of
solid black.
Replace the Laser Unit
(REP 7.1 ROS Assembly
(Laser Unit)/ Front
Spring Assembly/ Right
Rear Spring Assembly/
Left Rear Spring
Assembly on
page 4-130).
Replace the MCU PWB
(REP 12.4 MCU PWB
on page 4-206).
Troubleshooting Procedure (Continued)
Step Actions and Questions Yes No