Copy Quality - Ricoh FT4430 Service Manual

COPY QUALITY

WHITE SPOTS
1.
Firefly Spots
- Possible Causes -
+ Developer too old
+ Insufficient toner in developer
+ Dirty seals around development unit
- Action -
Is there a small black spot in the center of the white spot?
I
Y N
I
Check and adjust the doctor gap (0.90 mm).
Is the image density too light?
Y N
1
}
Clean the ends of the development roller.
Replace the developer and the side seals.
)
Correct the light copy condition. Refer to "Light Copy" section.
2. Small Spots
- Possible Causes -
+ corona wire.
Dirty
Incorrect corona current
- Action -
Perform drum conditioning. If that does not solve the problem, check
whether the charge corona current is correct? "
I
Y N
I
Adjust the charge corona current.
Clean the transfer corona wire and adjust the transfer current.
11-1
16 April '88