Oce 7050, Technical & Service Manual, Page: 39 / 275

8 TSM Océ 7050 Copy quality
Uneven background perpendicular to the feed direction
Black stripes in feed direction
possible cause action / remark
developing unit occasionally
short-circuited to ground measure bias voltage on high voltage supply
22PBA04 TP1 (-200V DC
±
4VDC) the lid of
dev. unit is not closed and touching the frame
cleaning blade vibrates check glue / springs
drum occasionally not
grounded clean / measure drum current (See Faults
page 37 ).
wobbling developing roller stripes every 5 cm
grid occasionally
short-circuited to ground see Faults 3 “White copy”
synchronisation failure check 23 Drive
301 adj. 1
,
2
,
3
light intensity changes
■
check exposure supply 04PBA01
■
check exposure control
■
check exposure sensor 04PBA02 with SDS
test +2, -4 (See Faults
page 33 )
possible cause action / remark
dirty grid See Maintenance 7 “Cleaning the charging
unit” , check cleaning blade
pick-off pawl scratch on drum / replace pick-off pawl
wires fuser extremely curled paper
dirty output rollers clean with cleaner K
air handling See Faults
6 “Dirty copy”
(irregular
scratches)
dirty original glass / SLA See Maintenance page 7 / clean with cleaner
O
cleaning blade damaged check for chips / hair
drum is scratched check scraper / brush / cleaning blade
deposit on the drum clean the drum (See Maintenance page 8 )