SERVICE CALL CONDITIONS
B234/B235/B236/D101/D102/D103 4-24 SM
Drum Potential Sensor Error 2: Vl Error
SC424 C
At auto process control initialization, the VL
detected after creation of the ID sensor pattern is
greater than 400.
Note: Vl is the drum potential after maximum laser
exposure, determined by reading the white
patches of the potential sensor pattern. To change
Vl, the machine adjusts the input current of the
laser diodes.
• Drum worn
• LD unit dirty
• Poor drum ground
connection
Drum Potential Sensor Error 3: Vh Adjustment Error
SC428 C
The correct value for Vh (standard drum
potential for halftones) could not be
detected after 45 consecutive
adjustments of LD power:
• The value for SP3904 001 could not
be attained for normal speed, or the
value of SP3904 002 could not be
attained for low speed mode.
• The LD power adjustments exceeded
the upper and lower limits (+185 and
–70).
• Drum potential sensor harness,
connector is loose, broken,
defective
• Drum potential sensor dirty
• Drum potential sensor defective
• Drum unit connector, harness
loose, broken, defective
• Poor drum ground connection
• LD unit defective
• BCU defective
PCU Set Error
SC435 C
The PCU is not installed, or it is installed
incorrectly. The PCU unit set switch is
checked every time the machine is
turned on and when the front doors are
closed.
1. Pull out the PCU unit.
2. Install it again.
3. Close the front doors
4. Cycle the machine off/on
Drum Potential Sensor Error 4: Vd Detection Error
SC437 C
During execution of auto
process control for normal speed
and CPM down mode when VD
was detected VG= -900V
• Do SP3902 001 to determine if auto
process control has been turned off. If
this SP is off, turn it on.
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