2NP
1-4-47
7800
Broken external thermistor
wire
The external thermistor deliv-
ers 0.3V or more.
Defective connec-
tor cable or poor
contact in the con-
nector.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Temperature sensor and engine PWB
(YC29)
Defective tempera-
ture sensor.
Replace the temperature sensor.
Defective PWB.
Replace the engine PWB check for correct
operation (see page 1-5-39).
7810
Short-circuited external
thermistor wire
external thermistor delivers
3V or more.
Defective connec-
tor cable or poor
contact in the con-
nector.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Temperature sensor and engine PWB (YC8)
Defective tempera-
ture sensor.
Replace the temperature sensor.
Defective PWB.
Replace the engine PWB check for correct
operation (see page 1-5-39).
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.
Poor contact in the
connector termi-
nals.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
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
PWB.
Replace the drum unit K (see 1-5-15).
Defective PWB.
Replace the engine PWB check for correct
operation (see page 1-5-39).
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.
Poor contact in the
connector termi-
nals.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
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
PWB.
Replace the drum unit C (see 1-5-15).
Defective PWB.
Replace the engine PWB check for correct
operation (see page 1-5-39).
Code
Contents
Causes
Check procedures/
corrective measures
Summary of Contents for TASKalfa 2551ci
Page 1: ...SERVICE MANUAL Published in September 2016 842NP11A 2NPSM06A Rev A TASKalfa 2551ci ...
Page 10: ...This page is intentionally left blank ...
Page 97: ...2NP 1 1 2 74 This page is intentionally left blank ...
Page 259: ...2NP 1 3 162 U486 Details on the modes Figure 1 3 47 Item No Description ...
Page 473: ...2NP 1 5 62 This page is intentionally left blank ...
Page 497: ...2NP 2 1 22 This page is intentionally left blank ...
Page 555: ...2NP 2 3 48 This page is intentionally left blank ...
Page 584: ...Installation Guide DP 770 B Document processor DP 772 Document processor Installation Guide ...
Page 620: ...DP 773 Document processor Installation Guide ...
Page 646: ...PF 791 500 x 2 Paper feeder Installation Guide ...
Page 654: ...PF 810 3000 sheets deck Installation Guide ...
Page 667: ...DF 770 D Document finisher Installation Guide ...
Page 685: ...AK 740 Bridge unit Installation Guide ...
Page 687: ...PH 7A C D Punch unit Installation Guide ...
Page 708: ...DT 730 B Document tray Installation Guide ...
Page 710: ...5 2013 5 302LC56750 01 H F G D D 6 4 3 7 E C D D M4 8 M4 8 M4 8 M4 8 ...
Page 711: ...FAX System W B Installation Guide ...