Table of Contents
Advertisement
PREVENTIVE MAINTENANCE SCHEDULE
Item
Drum
Charge Wires
Charge Grid
End Blocks
QL
Around Drum
PTL
ID Sensor
V Sensor
Around Drum Erase Lamp
Cleaning Blade
Cleaning Brush
Cleaning Unit
Used Toner Tank
Explanation
The drum exceeding its lifetime may cause black lines
in half tone area, dirty background, and overtoning.
Replace the drum at regular intervals.
Dirty charge wires may cause uneven image density.
They should be cleaned or replaced at regular
intervals.
Toner tends to accumulate on the corona end blocks,
and this can result in poor copy quality or even a high
voltage leak. Clean end blocks at regular intervals.
If toner accumulates on the QL filter, a dirty
background or a repeating negative image may result.
Clean the QL filter 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 paper dust or toner accumulates on the ID sensor,
the toner density cannot be controlled correctly. This
results in light copy or overtoning. Clean this sensor
at regular intervals.
If paper dust or toner accumulates on the V sensor,
the image density cannot be controlled correctly. This
results in light or dark copies. 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 and/or scratches on the drum. The
blade must be replaced or cleaned 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.
The used toner tank becomes full before the used
toner overflow detection if the tank is not emptied
when resetting the toner end counter (SP83). This
may cause poor cleaning, damage to the cleaning
empty the tank at regular intervals unit and the drum,
and/or toner scattering inside the machine.
4-48
12 February 1992
Advertisement
Table of Contents
