Main Control Pcb Connections - Haier AFD626TGW Service Manual

SERVICE MANUAL
Model:AFD626TGW/R/B

7-2. Main control PCB connections

There are 5 connectors on the main control panel.
CN1 is the connector for the sensors and the PWM. Its pins are:
1: GND;
2-4: Null;
5: Pin5 and pin1 connect to the variable temperature compartment sensor. We can test the sensor
with these two wires. Its resistance in normal operation is between 10.9 and 25.19kΩ (correspond
to -10℃～-25℃). The resistance at normal temperature is between 2.49 and 1.61kΩ (correspond
to 20℃～30℃);
6: Pin6 and pin1 connect to the fridge evaporator sensor. We can test the sensor with these two wires.
Its resistance in normal operation is between 6.35 and 3.88kΩ (correspond to 0℃～10℃). The
resistance at normal temperature is between 2.45 and 1.58kΩ (correspond to 20℃～30℃);
7: GND;
8: Pin8 and pin7 connect to the fridge storage sensor. Resistance test is the same as the fridge
evaporator sensor;
9: Pin9 and pin7 connect to the defrosting sensor. Resistance test is the same as the variable
temperature compartment sensor;
10: GND;
11: Pin11 and pin10 connect to the freezer sensor. Resistance test is the same as the variable
temperature compartment sensor;
12: PWM;
CN2 is the connector for display panel, the door switch, the LED lights and ambient temperature
sensor. Its pins are:
1: GND；
2: +5V；
3: Com-in；
4: Com-out；
5: Door switch signal；When the door is opened, GND and the signal wires are switch to conduction.
When the door is closed, the wires are disconnected;
6：Pin6 and pin1 connect to the ambient temperature sensor. Resistance test is the same as the fridge
evaporator sensor;
7: LED lights +12V；
8: LED lights GND；
CN3 is the connector for the freezer fan motor and the damper. Its pins are:
1: Null;
2: Freezer fan motor GND;
3: Freezer fan motor +15V(MAX);
4-6: Null;
7-10: Damper motor;
Issue 2010-10-25
Rev. Ref1010S025V0
27