Separator Ac Bias - Oki LP-1040 Maintenance Manual

10.1.4

Separator AC Bias

Note
Depending on when your unit was manufactured, the high voltage power supply unit may be
made up of only one or two different circuit boards. This section will describe the adjustment
procedures for both configurations.
(1) One circuit board configuration
1.
Perform the first procedure of 10.1.1 Primary
Charger Load Current Calibration on p.
10-2 so that the front power supply unit is
visible.
2.
Insert the digital multimeter's terminals into
the high voltage power supply unit's CH4 and
GND terminals. Then activate the separator
bias by going to Test -> DC CHECK in
Engine Maintenance mode (see 2.3.10 Test).
Measure the AC load voltage effective value
Vdca.
Note:
Set the digital multimeter's measurement
range to AC to measure.
3.
If calibration is required, rotate the CH4
adjustment volume with a screwdriver for
voltage calibration.
CH4 adjustment volume
Setting range: 8.25 to 8.75kV
Ideal value: 8.5kV
10-10
GND terminal
CH4 terminal
(digital multimeter reading = 2.9 to 3.1V)
P-P
(digital multimeter reading = 3.0V)
P-P