Ricoh FW780 Service Manual - Page 145
Development bias voltag adjustment, Preparation, Bias Voltage for Image Area
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3.5 DEVELOPMENT BIAS VOLTAGE ADJUSTMENT NOTE: This adjustment is required when the charge/bias/grid power pack is replaced. Preparation: 1. Turn off the main switch, and remove the rear cover. 2. Connect the ground terminal of the multimeter to the machine ground, and connect the voltage terminal to TP1 on the charge/bias/grid power pack. 3. Set the multimeter range to dc 1500 V. 4. Turn on the main switch. 3.5.1 Bias Voltage for Image Area ADJUSTMENT STANDARD: dc --180 ± 10 V. 1. Access SP mode and select No. --20. 2. Press the key to turn on the bias voltage. 3. Check the multimeter. If the voltage is not that of the standard voltage, press the key and then change the voltage using and keys. 4. If the voltage is within that of the standard voltage, press the key. SM 5-11 A163
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