Samsung SR-40RMB Service Manual page 19

7. Load Operation and Indicating Lamp Controlling Parts
a) When the COMP is turned on, the micom (pin 24) outputs high (DC 5V) and a realy is
activated. When the COMP is turned off, the micom (pin 24) outputs low (0V)
b) The defrosting heater is turned on, the micom (pin 23) outputs high (DC 5V) and a realy is
activated. When the defrosting heater is turned off, the micom (pin 23) outputs low (0V).
c) Indicating Lamp is turned ON when MICOM(PIN 22) input voltage is high and DC12V is
passed to LED through resistance R703.
When MICOM(PIN 22) output is low, LED is turned OFF.
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