Ricoh FT4480 Field Service Manual page 127

IV. SEPARATION CORONA
OPTIMUM ADJUSTING VALUE: AC 39.2 ± 1.5 µA
1. Position the drum shoe [A] at the center of the shaft so that the
axis of the current sensing plate is aligned between the separation
corona wires as shown.
2.
Reinstall the drum stay (1 screw and 1 knob) and return the T/S
corona unit to its original position.
NOTE: The cleaning unit should be also installed at this time.
3. Turn on SW 4 on the switching board.
4. Select the dc 200 µA range of the digital multimeter [B].
5. Turn on the main switch and adjust the separation dc current by
turning "DDC" on the power pack - T/S [C]. (Wait 30 seconds for the
corona current to stabilize.)
6. Turn off the main switch and select the ac 200 µA range of the
multimeter.
7. Turn on the main switch and adjust the separation ac current by
turning "DAC" on the power pack - T/S. (Wait 30 seconds for the
corona current to stabilize.)
8. Turn off the main switch.
9. Repeat steps 4 to 8 until both the dc and ac corona currents are
within in the optimum ranges.
10. Turn off the main switch and SW 4.
DC -2.7 ± 0.3 µA
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