Black Spots - Ricoh FT7770 Service Manual

30 April, '89
1)
Does the knocking solenoid energize properly?
Y N
I
Does CN304-A12 drop from 24 volts to 0 volts each copy
cycle?
Y N
I
Replace the knocking solenoid.
Replace the dc drive board.
Clean the upper seal of the development unit.
2) Black spots at the leading edge.
Is the separation corona wire properly installed?
Y N
I
Clean the separation corona wire and T/S corona unit.
If the separation corona current is incorrect, clean the
separation corona wire and adjust the separation corona current.
13-18