Ricoh FT4460, Service Manual, Page: 338 / 413

28 February 1989
1. COPY QUALITY
1.1 BLANK COPY (WHITE COPY)
- Phenomenon -
White or almost white copy
- Possible Causes -
1.
2.
3 .
4.
5.
6 .
Charge is not applied.
This is the result of a CC/TC bias power pack (charge) failure, poor
contact of the lead wire, a broken charge corona wire, or a leak in the
insulator or endblock.
Copy image is not transferred to the paper.
This is the result of a CC/TC bias power pack (transfer) failure, poor
contact of the lead wire, poor contact of transfer/separation charger
casings, a broken transfer charge wire, or a leak in the insulator or
endblocks.
Copy image grid gives no output.
Development roller does not turn due to binding caused by a broken
drive gear.
Correct bias voltage is not applied.
If the bias terminal is not connected properly, the development roller will
be electrically grounded. As a result, the charge on the development
roller will be equal to the drum surface level resulting in poor development
(blank when copying solid black originals).
The sensitivity of the drum has changed
Exposure to fluorescent light or direct sunlight for long periods of time will
destroy the ability of the drum to accept a charge. If there is no charge
remaining on the drum surface, copies will be blank.
Exposure to ammonia gas or fumes for long periods will also destroy the
ability of the drum to accept a charge.
12-1