5-28 Phaser 6280 Color Laser Printer Service Manual
Print-Quality Troubleshooting
Black Print
The entire image is black.
Initial Actions
■ Check the paper transfer path.
■ Ensure there are no debris on the transfer path.
Troubleshooting Reference Table
Applicable Parts Example Print
■ Laser Unit, PL5.1.2
■ Print Cartridge (C/M/Y/K),
PL5.1.18-21
■ MCU Board, PL9.1.20
■ Image Processor Board, PL9.1.27
Troubleshooting Procedure Table
Step Actions and Questions Yes No
1 1. Check the Print Cartridge (C/M/Y/K)
for damages.
2.Is the Print Cartridge damaged?
Go to step 2. Replace the
Print Cartridge
(page 8-10).
2 1. Check the paper condition.
2.Is the paper dry, recommended
type, and loaded in the correct
position?
Go to step 3. Replace the
paper.
3 1.Perform Test Print (Cyan 20%,
Magenta 20%, Yellow 20%, and
Black 20%): Service Mode > Test
Print.
2.Does the image quality improve?
Complete. Go to step 4.
4 1. Check the Transfer Unit for correct
installation. Reseat the Transfer Unit
(page 8-8).
2.Does the image quality improve?
Complete. Go to step 5.
Black Print