Hitachi RAF-25RPA Service Manual page 61

Main parts
(1)
DB601 DB1
This operates to rectify the DC voltage applied between terminals A and B of the terminal board to
a DC voltage.
(2) C021 and C022
This smoothes the voltage rectified for operating the
compressor.
When the input voltage is taken for the sine wave as
shown in the top of Fig. 1-2, it is rectified by the
DB601 and becomes the waveform as shown in the
middle of Fig.1-2. After that, the voltage is smoothed
by the C021 and C022, and becomes the waveform
shown in the bottom of Fig.1-2.
(3) DB1 and C041
The DB1 rectifies the input voltage and the C041
smoothes it for the control power supply.
If the units above have any failure, the control power
supply won't operate. In such a case, replace the
main P.W.B.
(4) C001, C002, C003, C011, C013, C014, L004
Together with suppressing the electrical noise generated at the time of compressor operation, the
external noise entering via the power supply line is absorbed as well, protecting the electronic
parts of the system.
(5) SA1, VS1, VS2, VS5
This operates to suppress external surges from indirect lightning etc.
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0V
0V
0V
Fig. 1-2