Ricoh Robin Service Manual page 224

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COPY QUALITY
If dirty background occurs only in ADS mode, do the following:
If the ADS voltage is not within ± 0.1 volts of the standard voltage (2.5
V), readjust the ADS voltage.
If the signal at CN101-5 stays HIGH, check the harness and sensor,
and replace defective parts.
If the signal at CN101-4 stays LOW, replace the main board.
6-6
24 June 1994

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