Kyocera TASKalfa 2551ci Service Manual page 354

Code Contents
7800 Broken external thermistor
wire
The external thermistor deliv-
ers 0.3V or more.
7810 Short-circuited external
thermistor wire
external thermistor delivers
3V or more.
7901 Drum unit K EEPROM error
No response is issued from
the device in reading/writing
for 5 ms or more and this
problem is repeated five times
successively.
Mismatch of reading data from
two locations occurs eight
times successively.
Mismatch between writing
data and reading data occurs
eight times successively.
7902 Drum unit C EEPROM error
No response is issued from
the device in reading/writing
for 5 ms or more and this
problem is repeated five times
successively.
Mismatch of reading data from
two locations occurs eight
times successively.
Mismatch between writing
data and reading data occurs
eight times successively.
Causes
Defective connec- Reinsert the connector. Also check for conti-
tor cable or poor nuity within the connector cable. If none,
contact in the con- replace the cable.
nector. Temperature sensor and engine PWB
(YC29)
Defective tempera- Replace the temperature sensor.
ture sensor.
Defective PWB. Replace the engine PWB check for correct
operation (see page 1-5-39).
Defective connec- Reinsert the connector. Also check for conti-
tor cable or poor nuity within the connector cable. If none,
contact in the con- replace the cable.
nector. Temperature sensor and engine PWB (YC8)
Defective tempera- Replace the temperature sensor.
ture sensor.
Defective PWB. Replace the engine PWB check for correct
operation (see page 1-5-39).
Poor contact in the Reinsert the connector. Also check for conti-
connector termi- nuity within the connector cable. If none,
nals. replace the cable.
Drum unit (K) and drum connect PWB(YC5)
drum connect PWB and engine connect
PWB (YC8)
Engine connect PWB and engine PWB
(YC4)
Defective drum Replace the drum unit K (see 1-5-15).
PWB.
Defective PWB. Replace the engine PWB check for correct
operation (see page 1-5-39).
Poor contact in the Reinsert the connector. Also check for conti-
connector termi- nuity within the connector cable. If none,
nals. replace the cable.
Drum unit (C) and drum connect PWB(YC3)
drum connect PWB and engine connect
PWB (YC8)
Engine connect PWB and engine PWB
(YC4)
Defective drum Replace the drum unit C (see 1-5-15).
PWB.
Defective PWB. Replace the engine PWB check for correct
operation (see page 1-5-39).
1-4-47
Check procedures/
corrective measures
2NP