Ricoh FT7770 Service Manual page 533

Vertical White Lines (Bands)
1)
Do the pick-off pawls swing
Y N
Correct or replace the
drum.
Does the oscillator mechanism of the pick-off pawls work
correctly?
Y N
Correct or replace any
Is the gap between the drum
(1 to 2 mm)?
Y N
Readjust the gap.
Replace the drum.
2) Straight Sharp Lines
Start a copy cycle and stop it before the copy reaches the
fusing unit.
Do the same lines exist on
Y N
If the surface of the
is scratching the hot
o Metering Blade
o Hot Roller Strippers
o Hot Roller Cleaning Blade
o Other
properly?
pick-off pawls, and replace the
defective parts.
and pick-off pawls
the unused copy?
hot roller is scratched, which part
roller surface?
13-9
30 April, '89
correct