Ricoh FW780 Service Manual - Page 156
Charge Current Adjustment, potential of the charge corona terminal becomes
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4.8.1 Charge Current Adjustment ADJUSTMENT STANDARD: dc--1000 ± 20 µA WARNING: Make sure that the machine is unplugged before connecting the multimeter on the charge/bias/grid power pack. Pay extreme attention when connecting the multimeter. The potential of the charge corona terminal becomes --5kV. 1. Connect all the terminals of the current measurement drum to the machine ground. 2. Disconnect the charge corona terminal of the charge/bias/grid power pack. 3. Connect the multimeter as shown in the illustration. 4. Set the multimeter range at dc 2 mA. 5. Plug in the machine and turn on the main switch. 6. Access SP mode and select No. --10. 7. Press the key to turn on the charge corona. 8. Check the multimeter. If the voltage is not that of the standard voltage, press the key and then change the voltage using and keys so that the charge current is dc --1000 ± 20 µA. 9. If the voltage is within that of the standard voltage, press the key. A163 5-22 SM