– 108 –
(3) Smoothing capacitor (C501, C502, C503)
This smoothes (averages) the voltage rectified by the diode stacks.
Be careful to avoid an electric shock as a high voltage
is generated. Also take care not to cause a short-circuit
through incorrect connection of test equipment
terminals. The circuit board be damaged.
When inrush protective resistor is defective, diode stack
may malfuntion. As a resuit, DC voltage is not
generated and no operation can be done.
(4) Smoothing capacitor (C510, C511)
This smoothes (averages) the voltage rectified by the
diode stacks. A DC voltage is generated in the same
way as in Fig. 1-4.
Voltage b side of C510 and - side of C511 is
about 330V.
(5) C506 to C508, C512, C513, NF COIL
These absorb electrical noise generated during
operation of compressor, and also absorb external noise
entering from power line to protect electronic parts.
(6) Surge absorber, varistor 1, 2, 3
(7) Inrush protective resistor
These absorbs external power surge.
This works to protect from overcurrent when power is
turned on.
<Reference>
DC voltage
(approx. 320-360V during operation)
L
N
a
b
VD
(DC voltage)
a
b
0V
0V
0V
Vd
C503
C503
C501
C502
C502
Fig. 1-2
Fig. 1-3
Fig. 1-4
N
Terminal Boards
P.W.B. (Main)
LD303
Self Diagnosis Lamps
Service
Switch
Reactor
SPM2
Smoothing Capacitors
Diode Stack
LD302
LD301
CN12
CN16
CN18
CN14
CN13
CN11
CN5
CN10
CN9
CN8
CN15
CN2
CN7
YEL
BLU
RED
BRN
GRN1
WHT
BLK
GRN2
RED
WHT