
2NP
1-4-46
7414
Drum unit Y type mismatch
problem
Absence of the drum unit Y is
detected.
Drum unit connec-
tor inserted incor-
rectly.
Reinsert the drum unit Y connector if neces-
sary.
Different type of
the drum unit is
installed.
Install the correct drum unit
(see page 1-5-15).
7420
Transfer belt unit type mis-
match problem
Absence of the transfer belt
unit is detected.
Transfer belt unit
connector inserted
incorrectly.
Reinsert the transfer belt unit connector if
necessary.
Different type of
the transfer belt
unit is installed.
Install the correct transfer belt unit
(see page 1-5-16).
7601
ID sensor 1 (front) error
Defective ID sen-
sor.
Replace the ID sensor 1.
Defective PWB.
Replace the engine PWB check for correct
operation (see page 1-5-39).
7602
ID sensor 2 (rear) error
Defective ID sen-
sor.
Replace the ID sensor 2.
Defective PWB.
Replace the engine PWB check for correct
operation (see page 1-5-39).
7611
ID sensor (K) density error
When the concentration in a
bias calibration is unusual.
Defective ID sen-
sor.
Replace the ID sensor.
Defective PWB.
Replace the engine PWB check for correct
operation (see page 1-5-39).
7612
ID sensor (C) density error
When the concentration in a
bias calibration is unusual.
Defective ID sen-
sor.
Replace the ID sensor.
Defective PWB.
Replace the engine PWB check for correct
operation (see page 1-5-39).
7613
ID sensor (M) density error
When the concentration in a
bias calibration is unusual.
Defective ID sen-
sor.
Replace the ID sensor.
Defective PWB.
Replace the engine PWB check for correct
operation (see page 1-5-39).
7614
ID sensor (Y) density error
When the concentration in a
bias calibration is unusual.
Defective ID sen-
sor.
Replace the ID sensor.
Defective PWB.
Replace the engine PWB check for correct
operation (see page 1-5-39).
7620
ID sensor timing error
Color registration correction
was failed.
Defective ID sen-
sor.
Replace the ID sensor.
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 ...