Ricoh D065 Service Manual page 458

Potential sensor calibration error 2
During drum potential sensor calibration, the drum potential sensor output
C
voltage does not meet specification when test voltages (–100V, –800V) are
applied to the drum.
311
Potential sensor defective
Potential sensor harness disconnected
Potential sensor connector defective or disconnected
-
IOB defective
OPC connector defective
Development power pack defective
Potential sensor calibration error 3
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±10 + VL + 130V)
312
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
Potential sensor calibration error 4
During drum potential sensor calibration when adjusting the drum potential
314 C
(VH) for LD power adjustment, the first time the VH pattern is made, the
drum potential sensor detects that VH is more than 500V:
VH > –500 + VL + 130 V
SM Appendix
Service Call Conditions
3-13 D062/D063/D065/D066