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31 December 1992
10. COPY QUALITY ADJUSTMENT
– General Information –
Image density is affected by the following factors:
(1) Light Intensity
(2) Bias Voltage
(3) Toner Density
(4) Grid Voltage
(5) Charge Corona Current
The items listed above must be kept in balance to maintain correct image
density.
In the field, image density should be adjusted first by changing the light
intensity. (Adjust the light sensor voltage.) If results are unsatisfactory,
the bias voltage can be changed. Also, if requested by the customer, the
overall image density can be changed by changing the toner density.
Normally, this should be kept at the normal position (factory setting).
The grid voltage and charge corona current are carefully adjusted at the fac-
tory. Any adjustment out of the adjustment standards will result in over toning,
toner scattering, dirty background, or light image density problems. The grid
voltage and charge corona current adjustment should be done only when re-
placing the Charge/Bias/Grid power pack, or to correct certain problems with
image density after checking all other possible causes.
COPY QUALITY ADJUSTMENT
5-57
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