Olivetti d-Copia 6500MF Plus Service Manual page 541

(7) Black or white streaks appear horizontally.
Print example
Defective part
Developer unit
1
Drum unit
2
Transfer belt unit
3
Fuser unit
4
High-voltage PWB
5
Y116520-3
1. Dirty developer unit or terminals
2. Flawed or dirty drum unit Improper grounding
3. Dirty transfer roller terminals
Check description
1. Check the print image on
paper has a problem at an
interval equivalent to the cir-
cumference of the develop-
ing roller.
2. Check that the developing
roller is dirty at its ends or at
the developing bias tab.
1. Check the print image on
paper has a problem at an
interval equivalent to the
circumference of the drum .
2. Check if the drum has
scratches.
3. Check the grounding tab of
the drum or the drum drive
shaft.
Check the print image that
implies dirt, deformation, or
scratches on the transfer belt,
which will be appearing at an
interval equal to its
circumference .
Check contamination and
deformation on the terminals .
Check the print image on paper
has a problem at an interval
equivalent to the circumference
of the fuser roller.
The bias voltage output sup-
plied by the high-voltage PWB is
not even.
Cause of trouble
1. If the ends of the developing roller and the
connecting terminals for developer bias are
dirty, clean.
2. Replace the developer unit. (see page 1-5-
56)
Execute drum refreshing.
(System Menu >Adjustment / Maintenance)
Replace the drum unit. (Perform U119)
(see page 1-5-57)
1. Check how the inner unit is mounted, and
correct, if necessary.
2. Replace the drum unit. (Perform U119)
(see page 1-5-57)
If the print image has a problem, clean the
transfer belt by a soft cloth.
1. If the connecting terminals are deformed,
correct for a proper conduction
2. Replace transfer belt unit.(see page 1-5-
65)
If the print image has a problem, clean the
fuser roller.
Replace the high-voltage PWB. (see page 1-5-
90)
1-4-213
Corrective Action
Service Manual
2N8/2N7