Light Print In Only One Color - Oki C9800 Series Service & Troubleshooting Manual

Light Print in Only One Color

Only one color; yellow, magenta, cyan, or black, is too light on the printed image.
Initial Actions to Perform
Perform Initial Actions from
Verify that color calibration
Check that the Toner Cartridge pull strip is completely removed from the affected color.
Areas of the Printer that Apply to Light Print in Only One Color
1. Verify all packaging material has been removed form the toner cartridges
2. Print the 100% Solid Fill test print. Can the problem be isolated to one primary
color?
3. Remove the Toner Cartridge and check for toner starvation in the Imaging Unit.
Is there evidence of toner starvation
4. Remove the Imaging Units and the Transfer Unit and check for toner
contamination on the high voltage contacts. Are the contacts contaminated?
5. Are the LED Heads dirty? Clean the heads with a clean, lint-free cloth. Did this
correct the problem?
6. Swap the LED Head of the problem color with any other LED Head.
Print a Solid Fill Test Pattern. Has the problem moved with the LED Head?
7. Are the wiring harnesses on the LED Heads undamaged, properly routed and
seated?
Print Quality Troubleshooting Practices
has been performed prior to using this troubleshooting procedure.
Imaging Unit
LED Head
Engine Control Board
Toner Supply
Troubleshooting Steps Resolution
Yes – Go to Step 2
No - Remove packing material
Yes – Go to Step 3
No - "Light Print in Only One
Color"
Yes – Replace the Toner Cartridge
No - Go to Step 4
Yes – Clean the contacts
No - Go to Step 5
Yes – Complete
No - Go to Step 6
Yes – Replace the LED Head
No - Go to Step 7
Yes – Reseat the wiring Harnesses
No - Replace in the following
order: Transfer Unit / LVPS /
Engine Control PCB