LG RD-JT30 Service Manual page 137

6.2. general specification
Input voltage : AC 90~264V
Input Frequency: 47~63Hz
Input power: 230W max
The power circuit shall supply DC power outputs as followings:
Output Voltage
1
2 3.3V
3 5V
4 12V
6.3. Circuit Operation Theory
6.3.1 EMI filter
C667
EMI components include common choke L651.L652, X Capacitor C667.C651, Y
Capacitor C653.C654. and differential choke L653. L654 and discharge resistor R651A,
R651B, This circuit designed to inhibit electric and magnetic interference for meet FCC
class B and CISPR class B standard requirements.
6.3.2 Bridge rectifier and filter
D655A~D655D are bridge rectifier, the C662.C655 are filter Capacitor .The AC
voltage is rectifier to DC and filter the DC ripple voltage .
Typical load current
380V
1.8A
0.15A
L653
2
1
R651A
L651
R651B
3
4
L654
D655A ~ D655D
3
~
4 1
- +
~
2
C662
0.45A
0.8A
C651 L652
C655
2 1
C653
C654
4 3
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