Ricoh CH-C1 - RTB 79: Colored spots appear at 40 mm or 189 mm intervals

Technical Bulletin PAGE: 1/1
Model: Model CH-C1 (Office/Pro)
Date: 06-Mar-14
No.: RD135079
Subject: Troubleshooting for Color spots (189mm/40mm pitch)
Prepared by: Ryuuta Chino
From: 1st Tech Service Sect. PP Tech Service Dept.
Classification:
Troubleshooting
Mechanical
Paper path
Product Safety
Part information
Electrical
Transmit/receive
Other ( )
Action required
Service manual revision
Retrofit information
Tier 2
Symptom
Colored spots appear at 40mm or 189mm intervals in solid image areas (black or white) or
throughout the entire image on the single-color Independent Pattern (1-dot), when printing
onto A3 or SRA3 sheets.
Cause
 Scratches or foreign particles on the OPC surface
 Scratches or foreign particles on the charge rollers
Solution
Do the following:
1. Load A3 or SRA3 paper in the tray.
2. In SP2-1090-003, set the test pattern to solid white, solid black, and single color
Independent Pattern 1-dot.
3. Print out the pattern and check the interval of the spots.
If the symptom occurs at 189mm intervals:
 If there are any scratches on the OPC, replace the OPC.
 If there are no scratches, wipe the OPC surface with a damp cloth and then with a
dry cloth.
If the symptom occurs at 40mm intervals:
 If there are scratches on the charge rollers, replace the affected roller(s).
 If there are no scratches, wipe the surface of the roller with a damp cloth and then
with a dry cloth.