PREVENTIVE MAINTENANCE SCHEDULE23 April 1993
ItemExplanation
Around theCharge Wires/Dirty charge wires may cause uneven image density.
DrumWire Cleaner/They should be replaced at regular intervals.
Charge Grid
End BlocksToner tends to accumulate on the corona end blocks,
this can result in a high voltage leak. Clean end
blocks at regular intervals.
Drum GroundingToo much drum grounding terminal deterioration
Terminalcauses poor drum grounding. This results in dirty
backgrounds and drum potential sensor calibration
errors.
QLIf toner accumulates on the QL, a dirty background or
a repeating negative image may result.
Clean the QL at regular intervals.
PTLIf 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.
ID SensorIf 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.
Erase LampIf 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.
Cleaning BladeA 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.
Cleaning BrushA 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.
Toner CollectionIf the toner collection bottle becomes full, a service
Bottlecall condition occurs and copying is prohibited. Empty
the toner collection bottle at regular intervals.
Developme-DeveloperThe tribo-chargeability of overused developer
nt Unitdecreases. This results in toner scattering.
Developer must be replaced at regular intervals.
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ACEC
