Uneven Density - Ricoh FT7770 Service Manual

30 April, '89
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If the problem cannot be resolved by following trouble
shooting "Uneven Density 2)Uneven density appears in
bands", clean the edge of the cleaning blade.
Make sure the blade cleaner moves smoothly, and the
cleaner edge is straight.
Correct or replace the pick-off pawls, and replace the
drum.
Refer to "Vertical White Lines 2) Straight sharp line(s)".
5) Black Stripe
Take out the development unit and clear any toner clogged in the
small holes of the toner outlet pipe (tap on the pipe.).
Cycle the development unit for 2 minutes using SP 1-1.
6) Black stripes at 10 mm
intervals. (After making
many solid black copies).
Cycle the development unit for 2 minutes using SP 1-1.
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