2NC/2NF/2NG/2NN/3P7/3P8/3P9
1-4-72
(4) The background is colored.
Print example
Cause of trouble
1. Toner is deteriorated in quality (under-charged).
2. Toner is over-supplied.
3. Developing bias is too high.
4. The layer of toner is too thick on the developing roller (too much toner).
5. The surface potential of the drum is too low (under low temperature
environment).
Defective part
Check description
Corrective Action
1
Developer unit
Executing U089 to generate PGs
and check the following :
(see page 1-3-41)
1. Check whether the device
was being continuously
operated with high density,
under a hot environment.
If the device was being continuously operated
with high density under a hot environment,
perform developing refreshing. (System Menu
>Adjustment / Maintenance)
2. Check contamination and
deformation on the
connecting terminals for
developer bias.
If the connecting terminals for developer bias
are dirty, clean.If the connecting terminals are
deformed, correct for a proper conduction.
2
Toner supply motor Check the toner supply motor is
continuously rotating.Check
wires for shortcircuiting.
If the harnesses are short-circuited and the
toner motor is continuously rotating,
replace the toner supply motor.
3
Drum unit
1. Conduct U139 to check the
internal temperature.
(see page 1-3-50)
If the internal temperature is 16-degree C or
less, continue printing until the temperature
reaches 16-dgree C or higher.
2. Check that the ground
terminal is not contaminated
or the conductive grease is
not applied with the
connecting terminals.
If the connecting terminals are dirty, clean.
If the amount of the grease applied is too
small, apply conductive grease to the bearing
on the receiver side of the drum drive axle.
Replace the drum unit. (Performs U119)
3. Check if the charging roller is
dirty.
If the charging roller is dirty, clean.Or replace it.
Summary of Contents for DP-480
Page 6: ...This page is intentionally left blank ...
Page 12: ...This page is intentionally left blank ...
Page 18: ...2NC 2NF 2NG 2NN 3P7 3P8 3P9 This page is intentionally left blank ...
Page 54: ...2NC 2NF 2NG 2NN 3P7 3P8 3P9 1 2 24 This page is intentionally left blank ...
Page 172: ...2NC 2NF 2NG 2NN 3P7 3P8 3P9 1 3 118 This page is intentionally left blank ...
Page 278: ...2NC 2NF 2NG 2NN 3P7 3P8 3P9 2 1 4 106 This page is intentionally left blank ...
Page 434: ...2NC 2NF 2NG 2NN 3P7 3P8 3P9 2 2 44 This page is intentionally left blank ...
Page 446: ...2NC 2NF 2NG 2NN 3P7 3P8 3P9 2 3 12 This page is intentionally left blank ...
Page 455: ...Installation Guide DP 480 Document processor Installation Guide ...
Page 458: ...2 3 4 5 6 A ...
Page 459: ...3 7 8 9 B C C ...
Page 460: ...4 10 ...
Page 473: ...PF 480 300 sheet Paper feeder Installation Guide ...
Page 476: ...2 5 6 4 3 B M3x8 B M3x8 B M3x8 B M3x8 1 2 ...
Page 477: ...3 9 10 8 7 1 2 ...
Page 478: ...4 13 12 11 1 2 C ...
Page 479: ...5 15 14 E D D E D D E D D E D D ...
Page 482: ...DU 480 duplex unit Installation Guide ...
Page 484: ...1 2 3 1 A B M3x8 ...
Page 485: ...2 6 7 5 4 A A B M3x8 ...
Page 489: ...IB 33 Network interface kit Installation Guide ...
Page 490: ...2 3 1 IB 33 2013 7 303PB56710 01 A B ...
Page 491: ...6 7 5 4 2013 7 303PB56710 01 B YC2007 A ...
Page 492: ...FAX System X Installation Guide ...
Page 495: ...2 5 4 3 2 B M3x8 A YC 2003 ...
Page 496: ...3 8 9 7 6 C G G 8 9 7 6 C ...
Page 497: ...4 11 10 12 13 D D E ...
Page 499: ......
Page 500: ......