Olivetti d-Copia 6500MF Plus Service Manual page 537

(4) The background is colored.
Print example
Defective part
Developer unit
1
Toner supply motor Check the toner supply motor is
2
Y116520-3
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).
Check description
Executing U089 to generate PGs
and check the following:
(see page 1-3-64)
1. Check whether the device
was being continuously
operated with high density,
under a hot environment.
2. Check the value of the U140
developer bias. (see page 1-
3-83)
3. Check contamination and
deformation on the
connecting terminals for
developer bias.
4. Check the toner sensor
output by U155.
(see page 1-3-89)
continuously rotating.Check
wires for short-circuiting.
要因
If the device was being continuously operated
with high density under a hot environment,
perform developing refreshing. (System Menu
>Adjustment / Maintenance)
If the density ID is too low at calibration,
execute maintenance modes U464 Calibration
and U410 Grascale Adjustment. (see page 1-
3-175,1-3-151)
If the connecting terminals for developer bias
are dirty, clean.If the connecting terminals are
deformed, correct for a proper conduction.
If the toner sensor output obtained by U155 is
100 or less, replace the developer unit. (see
page 1-5-56)
If the harnesses are short-circuited and the
toner motor is continuously rotating,
replace the toner supply motor.
1-4-209
Corrective Action
Service Manual
2N8/2N7