Service Call Tables
SM 4-27 D014/D015/D078/D079
Trouble-
shooting
SC420 C Potential sensor error: Vd Adjustment K
SC421 C Potential sensor error: Vd Adjustment M
SC422 C Potential sensor error: Vd Adjustment C
SC423 C Potential sensor error: Vd Adjustment Y
The development potential of the drum before exposure (Vd) cannot be
adjusted to within ±8 V of the target voltage (-900V).
Drum potential sensor harness, connector is loose, broken,
defective
Drum potential sensor dirty
Drum potential sensor defective
Drum connector, harness loose, broken, defective
Development power pack defective
VBCU defective
SC424 C Potential sensor error 5: Vl adjustment K
SC425 C Potential sensor error 6: Vl adjustment M
SC426 C Potential sensor error 7: Vl adjustment C
SC427 C Potential sensor error 8: Vl adjustment Y
Vpl could not be adjusted to within ±5V of the target Vpl after exposure
of the ID sensor patterns.
Drum worn
LD unit dirty
Poor drum ground connection
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