Ricoh FT6645 Manual page 220

PREVENTIVE MAINTENANCE SCHEDULE
Item
Around the Charge Wires/
Drum Wire Cleaner/
Charge Grid
End Blocks
Drum Grounding
Terminal
QL
PTL
ID Sensor
Erase Lamp
Cleaning Blade
Cleaning Brush
Toner Collection
Bottle
Developme- Developer
nt Unit
Dirty charge 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
backgrounds and drum potential sensor calibration
errors.
If toner accumulates on the QL, a 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, a dirty
background may occur in the erased area that
becomes progressively worse in 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 a 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 prohibited. Empty
the toner collection bottle at regular intervals.
The tribo-chargeability of overused developer
decreases. This results in toner scattering.
Developer must be replaced at regular intervals.
4-66
Explanation
23 April 1993