Ricoh A229 Service Manual page 432

Rev. 2/99
SC366: CRC Error
- Definition -
Electrical noise causes sent data and received data to differ. A CRC check can detect
this error.
- Possible cause -
• Defective connection board
• Defective or disconnected interface cable
SC370-01: Potential sensor error 1
Definition- [D]
When calibrating the drum potential sensor at the process control initial setting, the
drum potential sensor output voltage is out of specification.
- 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
SC370-02: Potential sensor error 2
Definition- [D]
When calibrating the drum potential sensor at the process control initial setting, the rate
of change of drum potential sensor output with voltage on the drum is out of
specification.
- 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
SC370-03: Potential sensor error 3
Definition- [D]
When adjusting VG for the unexposed drum during process control initial setting, –
1000V is applied to the charge grid, the drum potential sensor should detect a VD of
about -900 V, but detects that VD is more than -970 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
SM
SERVICE CALL CONDITIONS
6-9 A229