LG SXS GR-P257/L257 - Manual (Page 28)

1. Explanation for PWB circuit
1-1. Power circuit
The power circuit includes a Switched Mode Power Supply (SMPS). It consists of a rectifier (BD1 and CE1) converting AC
to DC, a switch (IC2) switching the DC voltage, a transformer, and a feedback circuit (IC3 and IC4).
Caution : Since high voltage (310 Vdc) is maintained at the power terminal, wait at least 3 minutes after unplugging the
appliance to check the voltages to allow the current to dissipate.
Voltage of every part is as follows:
(1) GR-P227/L227
Part VA1 CE1 CE2 CE3 CE4 CE5
Voltage 230 Vac 310 Vdc 16 Vdc 12 Vdc 16 Vdc 5 Vdc
EXPLATION FOR MICOM CIRCUIT
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