Ricoh D0C8, Service Manual

Page: 706 / 1647

Troubleshooting for Image Quality Problems
D0CA/D0C9/D0C8/D0CB 6-132 SM
Image problems may appear at regular intervals that depend on the circumference of
certain components.
The following diagram shows the possible symptoms (black or white dots at regular intervals).
[A]: Paper feed direction
[B]: Problems at regular intervals
Enter the SP mode, and then select SP2-109-003.
1.
Select the test pattern to print from the list, and then press [OK].
•
"13 (Independent Pattern (4dot))" pattern is recommended to identify the problem
color.
2.
Select SP2-109-005 (1: Full Color, 2: Cyan, 3: Magenta, 4: Yellow, 5: Black) to select the
printing color.
3.
To change the density of test pattern, select density with SP2-109-006 to 009 for each
color.
If select "0" with
SP2-109-006 through 009, the color adjusted so will not show up in the
test pattern.
4.
Press "Copy Window", then specify the settings on the copier application for test print
(paper size etc…).
5.
Press "Start" to start the test print.
Interval
(pitch)
Target part Replacement part Roller R
(phi)
26.7mm
50.4mm
33.7mm
55mm
68.5mm
22.5mm
22.5mm
75.3mm
78.5mm
78.5mm Charge roller cleaner
lubricant roller (Brush
roller)
Charge roller
Paper transfer roller
ITB drive roller
Development roller (K)
Development roller
(CMY)
Drum
PCDU (Photo Conductor and
Development Unit)
PCDU (Photo Conductor and
Development Unit)
PCDU (Photo Conductor and
Development Unit)
Paper Transfer Roller Unit
ITB (Image Transfer Belt) Unit
PCDU (Photo Conductor and
Development Unit)
(K)
8.5mm
10mm
10.73mm
17.5mm
21.664mm
12mm
12mm
24mm
25mm
25mm