Hitachi RAM-40QH5 Service Manual page 37

(3) Smoothing capacitor (C501, C502, C503)
This smoothes (averages) the voltage rectified by the diode stacks.
L
N
DC voltage
(Approx. 330 or 360V during operation)
SPM2
Reactor
(4) Smoothing capacitor (C020, C021)
This smoothes (averages) the voltage rectified by the diode stacks.
A DC voltage is generated in the same way as in Fig. 1-3. Voltage between + side of C020 and – side
of C021 is about 330V.
a
Fig. 1-2
a
b
Vd
Smoothing Capacitors
(C501, C502, C503)
Diode stack
Switching Power P.W.B.
(D25 VB60)
(For Indoor P.W.B)
+ +
b
— —
C501 C502
OV
OV
Fig. 1-3
Service switch
Be careful to avoid an electric shock as a high voltage is
G
generated. Also take care not to cause a short-circuit through
incorrect connection of test equipment terminals. The circuit
board could be damaged.
– 43 –
+
+
Vd (DC voltage)
—
C503
—
Power P.W.B.
Control P.W.B.
Terminal
Board (4p)
Terminal
Board (2p)