Ricoh B234 - Page 27

SERVICE CALL CONDITIONS
SM 4-25 B234/B235/B236/D101/D102/D103
Trouble-
shooting
Drum Potential Sensor Error 5: ID Sensor Pattern Potential
SC438 B
When the ID sensor potential
(Vp) was measured after a cold
start, or at the end of a job, the
total of this reading and the
value of the setting of SP2201
004 did not exceed 800V
(development unit power pack
output) after 10 continuous
samplings.
• Drum potential sensor defective
• BCU defective
• IOB defective
• Poor drum unit connection or connectors
defective
• Poor drum ground connection
• LD defective
• Poor drum cleaning ground connection
• Drum worn
• Dirty laser optics
Drum Potential Sensor Error 6: Vh Abnormal
SC439
When the LD power was adjusted
during auto process control, the first
value detected for the Vh pattern
(used to set standard drum
potential for halftones)
exceeded -730V.
• Drum potential sensor harness,
connector loose, broken, defective
• Drum potential sensor defective
• LD unit defective (pattern could not be
created)
Transfer Output Error
SC440 B
One of the following conditions was detected
for 17 counts (about 100 ms) when the transfer
voltage was applied with the main motor
operating:
• The value for the transfer current was set for
70uA, but the feedback voltage was less
than 0.75V (less than 1.5 KV).
• When the feedback current was less than
0.16V (10uA), the feedback voltage was
less than 0.15V (less than 300V) due to a
poor input connection.
• When the feedback current was less than
0.16V (10uA), the feedback voltage was
less than 3.05V (over 6.1 KV) due to a poor
output connection.
• Transfer power pack
harness, connectors loose
or broken
• Transfer power pack
harness or connectors
have short circuited
• Transfer power pack is
defective
Development Motor Lock
SC441 B
While the motor is operating, the motor
lock signal remained LOW for 2 s
• Development motor lock due to
overload
• IOB defective