2.4Power Supply Board
The power supply 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 |
|
|
+8 V | Analog supply voltage |
|
|
PS board and analog circuit supply voltage | |
|
|
(2)High Voltage Power Supply Circuit
This circuit generates following voltages required for electrophotographic process from +5 V, according to the control sequence from the control board. When cover open state is detected, +5 V supply is interrupted automatically to stop the supply of all
Output |
| Voltage | Use | Remarks |
|
|
|
| |
CH | Voltage applied to charging roller |
| ||
|
|
|
|
|
DB | V/+300 V | Voltage applied to developing roller |
| |
|
|
|
|
|
SB | V/ 0 V | Voltage applied to toner supply roller |
| |
|
|
|
|
|
TR | +500 | V to +4 | Voltage applied to transfer roller | Variable |
|
|
|
|
|
CB | +400 | V | Voltage applied to clearing roller |
|
|
|
|
|
|
(3)Photosensor
The photosensor mounted on this power supply board monitors the paper running state during printing.
2 - 8
