Service manual

18
1. DC POWER SUPPLY
Refer to “C” (DC Power) in the circuit diagram
DC Voltages is needs +12[V] and +5[V].
DC +12[V] is used for relay control, and DC +5[V] is used for the micro-computer. and the peripheral hardware in the P.C.B.
DC +5[V] is regulated y IC2(7805S).
CE1, CE2, CC6, CC5 designed for voltage regulation or noise filtering.
2. RESET
Refer to “A” (reset) in the circuit diagram.
Number 4 (IC1) is used for reset the micro-computer when the power is on or off.
3. SENSOR VALUE INPUT
Refer to “B” (Sensor) in the circuit diagram.
Number 7 (IC1) is used for reading the value of the sensor.
Temperature is read on voltage instead of the resistance of the sensor.
4. AC LOAD CONTROL
Refer to “D” (AC Load) in the circuit diagram.
Nuber 5 (IC1) is used for control the relay(RL1).
RL1 controls Reversing valve, Lamp or Fan motor.
MICOM PIN ASSIGNMENT
1(VDD)
2
3
4(RESET)
VDD
no use
no use
Reset input
VSS(GND)
Sensor input
VREF
Relay control output
(VSS)8
7
(VREF)6
5
PIC12C671