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4
PCB DRIVING DESCRIPTION
Power Supply(1)
CL1
AC 220V
FUSE1
3.15A
DESCRIPTION
DC Power Supply in circuit needs +12V and +5V. +12V is used for Compressor Driving Relay, Triac Driving
Photo Triac, Buzzer Driving, Stepping Motor. AC voltage of secondary Power Transformer is rectified by Bridge
Diode, and it is filtering by Main Condensor CE1.
Filtered DC voltage is about +18V, is regulated +12V DC by Regulator IC7812.
And it is regulated +5V DC by Regulator IC7805.
VAR is serge filter and CC1, CC2, CC3 is Noise filter.
Oscillator(2)
DESCRIPTION
Oscillatory Frequency drive Micom, it is made up 8MHz resonator oscillatory Freqency.
Ocillatory wave is as following Fig 2-1.
VAR
275V
104K
POWER TRANS
D2
D1
CC1
CE1
+
D4
D3
35V
104
1000 F
19
OSC
20
8M
23
12V
IC2
7812
CC2
CE2
VI VO
+
104
25V
470 F
5V
CC13
104
V
-10%
DD
V
+10%
SS
5V
IC3
7805
CC3
CE3
VI VO
+
16V
104
100 F
Fig 2-1
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