Ricoh A151, Field Service Manual

Page: 169 / 397

8. 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
exposure lamp voltage. If results are unsatisfactory, the bias voltage
can be changed. Also, if requested from 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
factory. Any adjustment out of the adjustment standard will result in
overtoning, toner scattering, dirty background, or light image density
problems. The grid voltage and charge corona current adjustment should be
done only when replacing the CC/Grid/Bias power pack or to correct certain
problems with image density after checking all other possible causes.
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FSM 5-73 A151/A152