Olivetti d-Copia 6500MF Plus Service Manual page 548

(15) Unevenly repeating horizontal streaks in the printed objects. Spots in the printed
objects.
Print example
Defective part
Developer unit
1
Paper
2
Service Manual
1. Installation at a high altitude.
2. Using the paper with high surface resistance.
Check description
The device is installed in an
altitude higher than 1500 m sea
level.
Check if paper is of high surface
resistance.
Cause of trouble
If the device is installed in an altitude greater
than 1500 m sea level, perform the following.
1. Press maintenance mode U140 and
execute "AC Calib" and "Calibration" .
2. Execute maintenance mode U140 and
select "AC Calib", later "Maginification" in
order to lower the setting value.
(Initial setting K:12).(see page 1-3-83)
Change the paper to another.
1-4-220
Corrective Action
2N8/2N7-4
Y116520-3