Ricoh infotec 3671F Service Manual page 167

TROUBLESHOOTING
COPY QUALITY TROUBLESHOOTING
7.1.3. Dirty or Dark Background
Possible Cause (Scanner)
•
Scanner shading correction error or wrong threshold.
Action:
1. Do the image sensor initialization with service function 10 (Shading Test).
(Refer to section 4-1.)
2. Adjust the scanner contrast threshold settings.
Possible Cause (Printer)
•
Poor drum sensitivity.
•
The charge is not properly applied.
•
The hot roller is dirty.
Action:
1. Try replacing the DTM.
2. Check if the hot roller surface is dirty or not.
•
If it is, clean the roller
•
If not, go to step 3.
3. Check if all the charge bias terminals on the DTM are properly connected.
•
If they are, check or replace the high voltage power supply.
•
If not, fix the connections.
7-4
July 30th, 1996