Circuit Details - Samsung RL23DATS Service Manual

11. CIRCUIT DETAILS

11-1 Power Supply Part
220V L.V.T
The AC input voltage will be stepped down by the transformer and be converted into the DC voltage
by the rectifying circuit (D101-104). The 1000F/35V wave filter capacitor will be used to filter out the
residue AC voltage and the manostat 7812 is used to output the steady 12V DC voltage that will be
used as the control voltage of the relay and display. The 12V DC voltage will be regulated by the
manostat 7805 to output the steady 5V voltage, which will be used as the output voltage of the chip
peripheral circuit and various signals (sensor, switch) .
Power supply
Vcc (DC 5V)
Vcc (DC 12V)
11-2 Reset Circuit Part
RESET
The reset circuit part enables the system program to return the system that meets power
trouble or abrupt power-off to the initial state by the memory of the core chip. At the very
beginning of the power-on, the reset chip voltage is LV, and becomes HV after normal
operation.
C104
104
chip peripheral power and sensor, bimetallic thermostat, door switch voltate
Control voltage of the display and relay
C202
104
12V
7812
C102
C101
170u
1000uF
F25V
50V
Applied circuit
51951A
C203
104
21
7812
C103
100u
F16V
Vcc