OKIDATA OL1200ex, Руководство по обслуживанию

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%2.2 Power/Sensor Board
2.2 Power/Sensor Board
The power/sensor board consists of an AC filter circuit, a low voltage power supply circuit, a high voltage
power supply circuit, heater drive circuit, and photosensors.
(1) Low voltage power supply circuit
This circuit generates the following voltages.
Output voltage Use
+5 V Logic circuit supply voltage +30 V
Motor and fan drive voltage and source voltage for
high-voltage supply +8 V
RS-232C line voltage 8 V
RS-232C line voltage and analog circuit supply
voltage
(2) High voltage power supply circuit
This circuit generates the following voltages necessary for electro-photographic processing from
+30 V according to the control sequence from the control board. When cover open state is
detected, +30 V supply is automatically interrupted to stop the supply of all the high-voltage
outputs.
Output Voltage Use Remarks
CH -1.30 KV Voltage applied to
charging roller
DB -240 V/+300 V Voltage applied to
developing roller
SB -360 V/450 V Voltage applied to
toner supply roller
TR +4 KV/-1.3 kV Voltage applied to
transfer roller Variable
CB +400 V Voltage applied to
cleaning roller
(3) Photosensor
The photosensor mounted on this power/sensor board supervises the paper running state during printing.
Figure 2-3 shows the sensor layout diagram.