Developer Ac Bias - Oki LP-1040 Maintenance Manual

10.1.2

Developer 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 CH2AC
and GND terminals. Then activate the
developer bias by going to Test -> DB
CHECK in Engine maintenance mode (see
2.3.10 Test). Measure the load voltage
effective value Vdba.
Note:
Set the digital multimeter's measurement
range to AC to measure.
3.
If calibration is required, rotate the CH2AC
adjustment volume with a screwdriver for
voltage calibration.
CH2AC adjustment volume
Setting range: 1.40 to 1.50 kV
Ideal value: 1.45kV
10-6
GND terminal
(digital multimeter reading = 0.625 to 0.675V)
P-P
(digital multimeter reading = 0.65V)
P-P
CH2AC terminal