Pcb driving description, Power supply(1), Oscillator(2) – Daewoo DPB-280LH User Manual
Page 24: Description, Fig 2-1
23
Power Supply(1)
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.
AC 220V
CL1
275V
104K
VAR
FUSE1
3.15A
POWER TRANS
D2
CC1
CE1
D3
D1
D4
104
+
35V
1000
µ
F
IC2
7812
VI VO
G
IC3
7805
VI VO
G
+
25V
470
µ
F
CC2
CC3
CE3
CE2
104
+
16V
100
µ
F
104
12V
5V
Oscillator(2)
19
OSC
CC13
104
5V
8M
20
V
DD
-10%
V
SS
+10%
Fig 2-1
DESCRIPTION
Oscillatory Frequency drive Micom, it is made up 8MHz resonator oscillatory Freqency.
Ocillatory wave is as following Fig 2-1.
4
PCB DRIVING DESCRIPTION