2NP
1-4-78
(6) Black streaks are printed vertically.
(7) Streaks are printed horizontally.
(8) One side of the print image is darker than the other.
Print example
Causes
Check procedures/corrective measures
Dirty contact glass.
Clean the contact glass.
Dirty slit glass.
Clean the slit glass.
Dirty or flawed drum.
Perform the drum refresh operation.
Flawed drum. Replace the drum unit (see page 1-5-15).
Deformed or worn cleaning
blade in the drum unit.
Replace the drum unit (see page 1-5-15).
Defective transfer belt.
Replace the intermediate transfer unit (see page 1-5-16).
Defective transfer roller.
Replace the transfer roller unit(see page 1-5-16).
Dirty scanner mirror.
Clean the scanner mirror.
Print example
Causes
Check procedures/corrective measures
Dirty or flawed drum.
Perform the drum refresh operation.
Flawed drum. Replace the drum unit (see page 1-5-15).
Dirty developer section.
Clean any part contaminated with toner in the developer
section.
Poor contact of grounding ter-
minal of drum unit.
Check the installation of the drum unit. If it operates incor-
rectly, replace it (see page 1-5-15).
Print example
Causes
Check procedures/corrective measures
Defective exposure lamp.
Replace the LED PWB (see page 1-5-28).
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 ...