Ricoh A229 Service Manual page 433

SERVICE CALL CONDITIONS
SC370-04: Potential sensor error 4
Definition- [D]
When adjusting the drum potential (V
drum potential sensor detects that V
- Possible causes -
• Potential sensor defective
• Poor connection between the potential sensor and the I/O board (IOB)
• IOB defective
• Poor connection between the drum unit and the I/O board (IOB)
• Development power pack defective
• Dirty or worn charge corona wire
SC370-05: Potential sensor error 5
Definition- [D]
When adjusting the drum potential (V
process control initial setting, the first time the V
potential sensor detects that V
- Possible causes -
• Potential sensor defective
• Poor connection between the potential sensor and the I/O board (IOB)
• IOB defective
• Poor connection between the drum unit and the I/O board (IOB)
• LD unit defective
SC370-06: Potential sensor error 6
Definition- [D]
When adjusting V
–1000V is applied to the charge grid, the drum potential sensor should detect a
V of about -900 V. However, the drum potential sensor detects that V
D
become – 900 + 10 V after 5 attempts.
- Possible causes -
• Potential sensor defective
• Poor connection between the potential sensor and the I/O board (IOB)
• IOB defective
• Poor connection between the drum unit and the I/O board (IOB)
• Development power pack defective
A229
is more than 500V.
H
for the unexposed drum during process control initial setting,
G
6-10
) at the process control initial setting, the
D
is more than V
D G
) for LD power adjustment during the
H
pattern is made, the drum
H
(grid voltage).
does not
D
SM