Samsung RB1855SW Service Manual page 28

Ref. 3) Check a load
Ref. 4) Check sensors
3. R-defrost sensor measures resistance of CN30 between ④~⑤.
4. F-defrost sensor measures resistance CN30 between ③~⑤.
5. The measured value above is compared to the sensor specification and the temperature table in
speciication found in the manual.
* Unplug the power cord and disconnect the
connector from the main PCB CN70, 71 and
measure the following:
1. Measure resistance between the terminals and
check for malfunctioning of a load and wire
connection.
Measurement
Subordinate
terminal
CN70 ⑤ - ①
R Defrost heater
CN70 ⑦ - ①
F Defrost heater
CN70 ⑨ - ①
Comp
Comp-circulation fan CN71 ⑦ - ①
R-Circulation fan CN71 ⑤ - ①
F-Circulation fan CN70 ③ - ①
R-Lamp CN71 ⑨ - ①
CN71 ③ - ①
F-Lamp
* Disconnect the connector from the main PCB
CN30.
* Resistance will be lowered while the
temperature rises due to a NTC type sensor.
1. R sensor measures resistance of CN30
between ②~⑤.
2. Freezer sensor measures resistance of CN30
between ①~⑤.
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Evaluation of mea-
surement result