Sharp VC-H670X Dokumentacja Strona 281

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1. COPY QUALITY
1.1 BLANK COPY (WHITE COPY)
- Phenomenon -
White or almost white copy
- Possible Causes -
1. Charge is not applied.
CC/G/B bias power pack (charge or grid) failure
Poor contact of power pack lead wires
Broken charge corona wire
Leak in insulator or endblock
2. Copy image is not transferred to the paper.
TC/SC power pack (transfer) failure
Poor contact of power pack lead wires
Poor contact of transfer corona wire
Leak in insulator or endblocks
3. Development roller does not rotate.
Broken drive gear
Defective development clutch solenoid
4. The development roller is not properly grounded.
5. Poor drum sensitivity
Drum exposed to fluorescent light or direct sunlight for long period of
time.
Drum exposed to ammonia gas or fumes for long period of time.
1 December 1990
6-1
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