tages (–100V, –800V) are applied to the
drum.
• IOB defective
• OPC connector defective
• Development power pack defective
311 C
Potential sensor calibration error 2
During drum potential sensor calibration,
the drum potential sensor output voltage
does not meet specification when test vol-
tages (–100V, –800V) are applied to the
drum.
• Potential sensor defective
• Potential sensor harness disconnected
• Potential sensor connector defective or
disconnected
• IOB defective
• OPC connector defective
• Development power pack defective
312 C
Potential sensor calibration error 3
During drum potential sensor calibration
when adjusting the drum potential (VD),
the drum potential sensor detects VD high-
er than VG (grid voltage).
-or-
When adjusting VD (drum surface poten-
tial 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)
• 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
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
Potential sensor defective
Potential sensor harness disconnected
Potential sensor connector defective or dis-
connected
IOB defective
OPC connector defective
LD defective
4. Troubleshooting
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