5-32 Phaser 6180 Color Laser Printer Service Manual
Print-Quality Troubleshooting
4 Check the Transfer Unit for correct 
installation. Reseat the Transfer Unit.
Does the image quality improve?
Complete. Go to step 5.
5 Check for debris in the laser beam 
path between the Laser Unit and 
Transfer Unit.
Remove the 
debris.
Go to step 6.
6 Check the wiring harness connectors 
P/J12 and P/J151 between the Laser 
Unit and the MCU Board.
Are the connectors securely 
connected?
Complete. Reconnect the 
connectors. 
Go to step 7.
7 Check the Print Cartridge (C/M/Y/K) 
for correct installation. Reseat the 
Print Cartridge.
Does the image quality improve?
Complete. Go to step 8.
8 Check the MCU Board for correct 
installation. Reseat the MCU Board.
Does the image quality improve?
Complete. Go to step 9.
9 Check the Image Processor Board for 
correct installation. Reseat the Image 
Processor Board.
Does the image quality improve?
Complete. Go to step 10.
10 Check the HVPS for correct 
installation. Reseat the HVPS.
Does the image quality improve?
Complete. Go to step 11.
11 Replace the Print Cartridge (page 8-9).
Does the image quality improve?
Complete. Go to step 12.
12 Replace the Laser Unit (page 8-50).
Does the image quality improve?
Complete. Replace the 
Image 
Processor 
Board 
(page 8-89). 
If not, replace 
the MCU Board 
(page 8-87).
Troubleshooting Procedure Table (continued)
Step Actions and Questions Yes No