Samsung RF31FM Series Manual page 180

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6. Self Diagnosis & Trouble Shooting
6-2. IF FAN does not operate
F FAN pulse voltage
PCB Typical Ground
CN76 "7"(Brown)
J23 JUMMPER
The voltage measured around 2~3V with
multi-meter though the voltage is very
weak because of pulse signal
☞ Display for checking the self-diagnostic
function
R FAN ERROR
C FAN ERROR
Reference
CN76-7(F),8(R),9(C)will generate the pulse signal when motor rotates.
These signals will be inputted into MICOM.
Unless signals are not inputted during motor operating, will be ON
10 seconds after fan Off. But if signals are not still entered, the above
operation will restart four times more.
If signals are not entered continuously, the motor will be restarted
after 10 Minutes. This function is effective when the normal operation
of motor would be restrained by foreign matters such as ice.
☞ The voltage between PCB typical Ground J23 JUMMPER and
F FAN ; CN76 "3"(Yellow) shall be less than DC 7~12V.
R FAN ; CN76 "4"(Orange) shall be less than DC 7~12V.
F FAN ERROR
C FAN ; CN76 "5"(Sky-blue) shall be less than DC 7~12V.
- Recheck if resistance values are different after measuring.
1) F-FAN 2) R-FAN
To do list
3) C-FAN
PCB Typical Ground
J23 JUMMPER
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