Ricoh MT-C1 Service Manual page 433

15 February 2006
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.
B140/B246 SERIES SERVICE MODE
• 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
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