Ricoh B064 Service Manual page 366

B140 SERIES AND G126 SERVICE MODE
SC No.
311 C Potential sensor calibration error 2
During drum potential sensor
calibration, the drum potential
sensor output voltage does not
meet specification when test
voltages (–100V, –800V) are
applied to the drum.
312 C 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).
-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)
314 C Potential sensor calibration error 4
During drum potential sensor
calibration when adjusting the drum
potential (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
315 C Potential sensor calibration error 5
During drum potential sensor
calibration, when –100V is applied
to the drum, the output value is out
of the prescribed range.
316 C Potential sensor calibration error 6
During drum potential sensor
calibration, when –800V is applied
to the drum, the output value is out
of the prescribed range.
B064 Series/B140 Series/G126
Symptom
4-42
Possible Cause
• 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
• Potential sensor defective
• Potential sensor harness disconnected
• Potential sensor connector defective or
disconnected
• IOB defective
• OPC connector defective
• LD defective
• 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
SM