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15 July 1996
Item
Around the
Charge Corona Wires/
Drum
Wire Cleaner/
Charge Corona Grid
End Blocks
Drum Grounding
Terminal
QL
PTL
ID Sensor
Erase Lamp
Cleaning Blade
Cleaning Brush
Toner Collection Bottle
Pick-off Pawls
PREVENTIVE MAINTENANCE SCHEDULE
Explanation
Dirty charge corona wires may cause uneven
image density. They should be replaced at
regular intervals.
Toner tends to accumulate on the corona end
blocks. This can result in a high voltage leak.
Clean end blocks at regular intervals.
Too much drum grounding terminal deterioration
causes poor drum grounding. This results in dirty
background and drum potential sensor calibration
errors.
If toner accumulates on the QL, dirty background
or a repeating negative image may result.
Clean the QL at regular intervals.
If paper dust or toner accumulates on the PTL
filter, its efficiency may be reduced. This can
cause toner to be reattracted to the drum during
transfer, reducing image density. Clean the PTL
filter at regular intervals.
If too much paper dust or toner accumulates on
the ID sensor, the toner density cannot be
controlled correctly. This results in light copy or
over toning. Clean this sensor at regular intervals.
If toner accumulates on the erase lamp, dirty
background may occur in the erased area that
becomes progressively worse during long copy
runs. Also this affects sensor pattern detection,
causing incorrect toner density and exposure
lamp control.
Clean this lamp at regular intervals.
A dirty or worn out cleaning blade will cause
black lines on copies or scratches on the drum.
The blade must be replaced at regular intervals.
A worn out cleaning brush will not clean the drum
surface effectively, resulting in dirty background
and damage to the cleaning blade. Replace at
regular intervals.
If the toner collection bottle becomes full, a
service call condition occurs and copying is
disabled. Empty the toner collection bottle at
regular intervals.
After long usage, the point that touches the drum
becomes worn and the area contacting the drum
is increased. This may cause drum filming,
resulting in vertical gray lines on the copy.
4-63
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