Temp Sensing Circuit - Samsung RS2511 Series Service Manual

OPERATION PRINCIPLES BY PARTS OF CIRCUIT

5-6) TEMP SENSING CIRCUIT

1) Sensor uses a thermistor which has a temp coefficient of negative resistance and controls resistance. When
the heat goes up, the resistance gets down and vice versa. R302, 4, 6, 9 and C301~C303, C305 are parts for
noise prevention but they are not related to temp sensing characteristics.
2) If Vf is the incoming voltage to MICOM in case of F-Sensor, Vf equals (Rth * Vcc)/ ((R301 + Rth). Where Rth is
resistance of THERMISTOR corresponding to Temp. Please refer to the Appendix Temp-to-Sensor
Resistance/Voltage conversion table(Temp-to-MICOM Terminal Voltage included) on A/S. (Next page)
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