Ricoh HL-F1 Field Service Manual page 235

I-16 Black spots
User Check
1. If the problem is not solved after printing a few pages, the drum unit may have glue from label stock
on the exposure drum surface. Refer to Step 1 in the " Possible cause and Remedy" and NOTE under
the "I-15 White spots".
2. The drum unit may be damaged. Install a new drum unit.
Possible cause and Remedy
1. Drum unit
• Are the spots at 75.3mm intervals? (The problem is not solved after printing a few pages.)
Yes: 1) If toner or glue remains stuck, wipe it off gently with a cotton swab. (Refer to NOTE under
the "I-15 White spots".) 2) If the exposure drum is scratched or deteriorated (exposed), replace
the drum unit.
2. Drum connection failure
• Is the contact between the drum unit and printer body connected correctly?
No: Clean contact electrode both on the drum unit and in the printer body. (
"Location of Grounding Contacts")
3. Fixing unit
• Are the spots at 79mm intervals? (The problem is not solved after printing a few pages.)
Yes: 1) Check and clean the heat roller with a dry cotton swab. 2) Replace the fixing unit.
4. High-voltage power supply PCB failure
• Is the problem solved after replacing the high-voltage power supply PCB?
Yes: Replace the highvoltage power supply PCB.
Troubleshooting Guide
6
(7) in p.240
233