SERVICE MANUAL - O. Rensch OHG

2DC
Code
Contents
Causes
Remarks
Check procedures/corrective measures
C7800
(A7800*)
Broken external temperature thermistor
• The input voltage is 0.5 V or less.
Poor contact in
the operation
board connector
terminals.
Reinsert the connector. Also check for continuity
within the connector cable. If none,
remedy or replace the cable.
Defective external
temperature thermistor.
Replace the operation board and check for
correct operation.
C7810
(A7810*)
Short-circuited external temperature
thermistor
• The input voltage is 4.5 V or more.
Poor contact in
the operation
board connector
terminals.
Reinsert the connector. Also check for continuity
within the connector cable. If none,
remedy or replace the cable.
Defective external
temperature thermistor.
Replace the operation board and check for
correct operation.
C7980
Waste toner reservoir overflow
probrem (when the total number of
copies is less than 100 thousand
sheets)
• After E31 is displayed, 1,000 sheets
are copied. Or waste toner exceeds 5
g.
Defective waste
toner sensor.
Defective engine
board (KP-5061).
Replace the waste toner sensor and check
for correct operation.
Replace the engine board (KP-5061) and
check for correct operation.
C7990
Waste toner reservoir overflow
probrem (when the total number of
copies is 100 thousand sheets or
more)
• After E31 is displayed, 1,000 sheets
are copied. Or waste toner exceeds 5
g.
Defective waste
toner sensor.
Defective engine
board (KP-5061).
Replace the waste toner sensor and check
for correct operation.
Replace the engine board (KP-5061) and
check for correct operation.
“A” is displayed on the market.
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