Ricoh infotec 3671F Service Manual page 168

July 30th, 1996
7.1.4. Uneven Image Density Across the Main Scan
Possible Cause (Scanner)
•
Dirty exposure glass
•
Partial scanner lamp defect
•
Scanner shading correction error or wrong threshold.
Action
•
Clean the exposure glass of the image sensor.
•
Replace the image sensor.
•
Do the image sensor initialization with service function 10 (Shading
Test). Refer to section 4-1.
Possible Cause (Printer)
•
Poor drum sensitivity.
•
Dirty laser optic components.
•
The doctor blade is deformed, or incorrectly positioned.
•
Uneven toner supply in the toner hopper.
Action:
1. Print a test pattern, and open the cover in the middle of printing.
2. Check if the toner is evenly distributed on the development roller.
•
If it is not, check the doctor blade, and the toner supply mechanism in
the toner hopper. If it is, go to step 3.
3. Check if the toner is evenly distributed on the drum.
•
If it is not, check the drum sensitivity and the laser optic components.
•
If it is, check if there is any dirt on the transfer roller surface.
COPY QUALITY TROUBLESHOOTING
7-5
TROUBLESHOOTING