Operation Part; Buzzer Part - Samsung RL33EBMS Service Manual

6-5 Operation Part

Defrost Heater
Compressor
Fan motor
Inside lamp
Gear motor
If outputing the relevant work circuit signals into the core chip port, the driving chip (ULN2003) will
be activated. The DC 12V voltage will set the relay terminals to the position of On due to relay coils
reaction to activate the circuit.

6-6 Buzzer Part

MICOM
The driving chip is initiated by the core chip generated CLOCK and impose the 12V volgtage on
the buzzer to make it voice a sound.
1
3
5
7
9
CON71
RED
1
3
5
35
NC
NO
Rc71
Rc72
Rc73
R801
4.7K
12
Buzzer
19
+12V
Ic05
RY71
11 6
RY72
4
13
3
14
RY74
2
15
1
16
RY74
DC 12V
38
6
5
4
1