Pcb Driving Description - Daewoo DPA-380R Service Manual

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PCB DRIVING DESCRIPTION

Power Supply(1)
AC 220V
FUSE
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 surge 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.
CM1 VAR1
275V
104K
POWER TRANS
D1
D3
CC1 CE1
+
D4
D2
35V
104
1000µF
34
X1
35
8M
26
12V
IC4
IC5
7812
7805
CC2 CE2
VI VO VI VO
+
104
25V
470µF
5V
CC13
104
V -10%
DD
V +10%
SS
5V
CC3 CE3
+
16V
104
100µF
Fig 2-1