
2NP
1-4-39
6040
NC sensor error
Deformed connec-
tor pin.
If the I/F connector pins of the fuser unit and
the main unit are deformed owing to foreign
matters, such as paper dusts, replace the
connectors or the units including the con-
nectors.
Shorted fuser
thermistor.
Replace the fuser unit (see page 1-5-17).
Defective PWB.
Replace the engine PWB and check for cor-
rect operation (see page 1-5-39).
6050
Abnormally low fuser
thermistor 2 (center) tem-
perature
The fuser temperature lower
than 100 °C/212 °F is
detected continuously for 1 s
during printing.
Deformed connec-
tor pin.
If the I/F connector pins of the fuser unit and
the main unit are deformed owing to foreign
matters, such as paper dusts, replace the
connectors or the units including the con-
nectors.
Defective fuser
thermistor.
Replace the fuser unit (see page 1-5-17).
Defective fuser
heater.
Defective PWB.
Replace the engine PWB and check for cor-
rect operation (see page 1-5-39).
6120
Abnormally high fuser
thermistor 3 (press roller)
temperature
The fuser temperature
exceeds 200 °C/392 °F for 1
s.
Deformed connec-
tor pin.
If the I/F connector pins of the fuser unit and
the main unit are deformed owing to foreign
matters, such as paper dusts, replace the
connectors or the units including the con-
nectors.
Defective fuser
thermistor.
Replace the fuser unit (see page 1-5-17).
Defective PWB.
Replace the IH PWB or the engine PWB and
check for correct operation (see page 1-5-
57, 1-5-39).
6130
Fuser thermistor 3 (press
roller) break error
Fuser thermistor 3 detects a
temperature of -14 °C/6.8 °F .
Fuser thermistor 3 does not
reach 30° C/86 °F even
after60 s during warming up.
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.
Fuser thermistor 3 and fuser PWB (YC4)
Fuser unit and engine PWB (YC30)
Deformed connec-
tor pin.
If the I/F connector pins of the fuser unit and
the main unit are deformed owing to foreign
matters, such as paper dusts, replace the
connectors or the units including the con-
nectors.
Defective fuser
thermistor.
Replace the fuser unit (see page 1-5-17).
Defective PWB.
Replace the IH PWB or the engine PWB and
check for correct operation (see page 1-5-
57, 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 ...