Hitachi RAS-E08H2A Service Manual page 49

5. Power Circuit for P.W.B.
• Fig. 5-1 shows the power circuit for P.W.B.
• In the power circuit for P.W.B., power supply for microcomputer, peripheral circuits, and IPM driver
circuit and, as well as DC 35V, are produced by switching power circuit.
• Switching power circuit performs voltage conversion effectively by switching transistor IC1 to convert
DC 330V voltage to high frequency of about 20kHz to 200kHz.
AC220-230V
Fig. 5-1
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