5-30 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 the wiring harness connectors 
P/J12 and P/J151 between the Laser 
Unit and the MCU Board.
Are the connectors securely 
connected?
Go to step 6. Reconnect the 
connectors.
Go to step 6.
6 Check the Print Cartridge (C/M/Y/K) 
for correct installation. Reseat the 
Print Cartridge.
Does the image quality improve?
Complete. Go to step 7.
7 Check the MCU Board for correct 
installation. Reseat the MCU Board.
Does the image quality improve?
Complete. Go to step 8.
8 Check the Image Processor Board for 
correct installation. Reseat the Image 
Processor Board.
Does the image quality improve?
Complete. Go to step 9.
9 Check the HVPS for correct 
installation. Reseat the HVPS.
Does the image quality improve?
Complete. Go to step 10.
10 Replace the Print Cartridge (page 8-9).
Does the image quality improve?
Complete. Go to step 11.
11 Replace the Laser Unit (page 8-50).
Does the image quality improve?
Complete. Replace the 
Image 
Processor 
Board
(page 8-89).
Troubleshooting Procedure Table (continued)
Step Actions and Questions Yes No