12V Power Circuit - Hitachi RAS-25CNH1 Service Manual

9. 12V Power Circuit

35V
DC 35V supplied from the outdoor unit is controlled by switching of regulator 1, and is smoothed by D102,
L102 and C102 to produce 12V.
Output voltage is divided by R102 and R103, and input to output dividing pin
that output voltage is 12V.
Waveform at
Waveform at
Out put Voltage
R101
R104
REG1
8 1
7 2
6 3
5 4
A
B
B
L102
A
D102
C105
0V 0V 0V
Fig. 9 — 1
Fig. 9 — 2
– 61 –
+ R102
C102
–
0V R103
0V
5
to control switching, so
12V