SERVICE MANUAL
Model: HB21FC45N*
29
Issue 2010-07-05
Rev. Ref1007S019V0
CON1 is the connector for the chill cabinet, which connects the following components from left to right:
1-2 are for the chill cabinet sensor (REF. Sensor).The range of the chill-cold sensor resistance
measured between these two wires is 6.35 - 3.88K ohm (relevant to 0℃ -10℃), under normal working
status, the range of the resistance is 2.45 - 1.58K ohm at ambient temperature (relevant to 20℃ -
30℃);
3–4 are for the light of the chill cabinet. They will be connected when the REF door is open, and vice
versa.
5 -6 are for the air damper heating wire, through which the output voltage and the damper resistance
of the damper heater wire are measured (which should be DC12V and 144±10% ohm respectively).
7 – 10 are for the air damper motor.
CON2 connects the display panel;
CON3 connects the display panel;
CON4 connects the following components from left to right:
1 – 2 are for the freeze sensor. The range of the freeze sensor resistance measured between them is
10.9 - 25.19K ohm (relevant to -10℃ -25℃); the range of the resistance is 2.49 - 1.61K ohm at
ambient temperature (relevant to 20℃ - 30℃);
3 -4 are for the defrosting sensor; the range of the resistance measured shall be the same to the
freeze sensor;
5 – 6 are for the light of the freeze cabinet. They will be are connected when the freezer door is open,
and vice versa;
7 - 9 are for the condenser fan motor. 8 - 9 can be used to measure the output voltage of the
condenser fan motor (DC 11-13V);
10 - 12 are for the Evaporator fan motor. 11 and 12 can be used to measure the output voltage of the
freeze fan (DC 11-15V).
CON5:
1 is reserved for future use;
2 is the cathode of the incoming signal of the frequency conversion board;
3 -5 are reserved for future use.
6 is the anode of the incoming signal of the frequency conversion board;
7 - 8 are for the ambient temperature sensor.
CN6 is the connector for the icemaker, which connects the following components from upper to lower:
1 - 2 are for the icemaker sensor. The resistance value measured should be the same to the freeze
sensor;
3 - 6 are reserved for future use;
7 – 8 are for the icemaker on/off switch;
9 - 10 are for the icemaker motor.
CON7:
1 – 3 connect the humidity sensor;
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