- V
L
Pattern Detection and V
L
Correction -
This is how the machine adjusts the exposure lamp voltage to compensate
for the effects of drum wear, dirty optics, and response of the drum to light.
Every 1,000 copies, an image of the V
L
pattern under the left scale bracket is
made on the drum. The machine compares the response of the ID sensor to
this image with the response to a bare area of the drum.
The exposure lamp voltage is adjusted if there have been significant
changes from the measurements made from when a new drum or lamp was
installed.
(The V
LP
/V
LG
range to which the above mentioned lamp voltage adjustment
is applied may be shifted to cancel the effect of ID correction.)
Initial V
LP
/V
LG
detection must be done by SP mode if a new drum is installed
or if the exposure lamp is cleaned or replaced.
- T/H Correction -
The efficiency of the transfer of charge from the drum charge roller to the
drum varies with the temperature near the drum charge roller. Also, the
drum potential after charging varies with the accumulated rotation time of the
drum.
A thermistor measures the temperature near the drum charge roller, and the
CPU keeps track of how long the drum has been rotating.
The machine adjusts the drum charge roller voltage depending on the
temperature and accumulated rotation time.
This section has provided an overview of all the process control procedures
done by the machine. The next few pages will explain each of these in more
detail. At the end, there will be a summary.
Detailed
Descriptions
STM 2-7 A156/A160/A162
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