5-38 Phaser 6180 Color Laser Printer Service Manual
Print-Quality Troubleshooting
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Ensure to wait for the Fuser to cool down before starting the procedure.
Troubleshooting Procedure Table
Step Actions and Questions Yes No
1 Check the black line’s regular intervals. 
Are there any black lines on the page?
Refer to “The 
following table 
lists the print-
quality defect 
corrective 
procedure, their 
definition, and 
the page where 
each procedure 
is provided.” on 
page 23.
Go to step 2.
2 Check the Print Cartridge (C/M/Y/K) 
for damages. Is the Print Cartridge 
damaged?
Go to step 3. Replace the 
Print Cartridge 
(page 8-9).
3 Check the Transfer Unit. Are there any 
damages on the Transfer Unit surface?
Replace the 
Transfer Unit 
(page 8-7).
Go to step 4.
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 Fuser for correct 
installation. Reseat the Fuser.
Does the image quality improve?
Complete. Go to step 6.
6 Check the paper path. Are there any 
toner contaminations on the paper 
path?
Complete. Go to step 7.
7 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 8. Reconnect the 
connectors.
Go to step 8.
8 Check the Print Cartridge (C/M/Y/K) 
for correct installation. Reseat the 
Print Cartridge.
Does the image quality improve?
Complete. Go to step 9.
9 Check the MCU Board for correct 
installation. Reseat the MCU Board.
Does the image quality improve?
Complete. Go to step 10.
10 Check the Image Processor Board for 
correct installation. Reseat the Image 
Processor Board.
Does the image quality improve?
Complete. Go to step 11.