Ricoh FT8680 Service Manual page 37

31 July 1995 PROCESS CONTROL
1.3.10 ADS Adjustment
Exposure Glass
ADS Pattern
ADS Pattern
A171D508.wmf
A171D570.img
The ADS pattern is located underneath the exposure glass bracket. During
the process control data initialization, the ADS reference voltage is adjusted.
When the first scanner is moved to the return position for the Vd adjustment,
the main PCB checks the ADS voltage through the ADS fiber optics cable.
The measured voltage is calibrated to the standard voltage (3 V) as the
reference for the auto image density control.
2-13