Ricoh D131 Service Manual page 488

Potential sensor calibration error (cut off)
During drum potential sensor calibration, the drum potential sensor
C
output voltage did not meet specification when test voltages
(–100V, –800V) are applied to the drum.
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SC380-31
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-
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Potential sensor calibration error (VD)
During drum potential sensor calibration when adjusting the drum
potential (VD), the drum potential sensor detects VD higher than
VG (grid voltage).
C
-or-
When adjusting VD (drum surface potential of black areas after
exposure), even after 5 adjustments of VG (charge corona grid
potential), VD could not be set in the target range (–800±20+ VL +
SC380-41
130V)
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-
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SM Appendix
Potential sensor defective
Potential sensor harness disconnected
Potential sensor connector defective or disconnected
IOB defective
OPC connector defective
Development power pack defective
Potential sensor defective
Potential sensor harness disconnected
Potential sensor connector defective or disconnected
IOB defective
OPC connector defective
Development power pack defective
Charge corona unit worn out, dirty
2-21
SC300: Image Development 1
D131/D132/D133