Ricoh D131 Service Manual page 486

ID sensor error: Potential surface reading error
C
The Vp value, which measures the reflectivity of the ID sensor
pattern, was not in the range of -70V to -400V.
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SC377-00
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-
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ID sensor pattern error
One of the following ID sensor output voltages was detected twice
consecutively when checking the ID sensor pattern.
C
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SC378-00
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
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-
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
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
SM Appendix
Potential sensor defective
Potential sensor harness defective
Potential sensor disconnected
IOB defective
OPC unit connector defective
Charge corona power pack defective
Charge corona wire dirty, broken
Vsp greater than or equals 2.5V
Vsg less than 2.5
Vsp = 0V
Vsg = 0
ID sensor defective
ID sensor harness disconnected
ID sensor connector defective
IOB defective
ID sensor pattern not written correctly
Incorrect image density
Charge power pack defective
ID sensor dirty
2-19
SC300: Image Development 1
D131/D132/D133