Troubleshooting
Samsung Electronics 4-29
Yes
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(cont.)
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Check the communication circuit of the Main
PCB of the outdoor unit.
1. Is there a fault in communication IC?
2. Is there a fault in TVS-Diode?
Measuring
Part
Communication IC Measuring Part
(Circuit Diagram)
Example of Measuring
Communication IC
Example of Measuring
TVS-Diode
Location
CommB(#7)
CommA(#6)
Measuring
Point
#5-GND, #6- Communication A, #7-
Communication B, #8-Vcc
Communication IC Measuring (Port)
Steady-state Measuring Value
Remark
COM 1(RED)
#6 - #5 0.9kΩ ~ 1.2kΩ
Measuring after separating the communicatio
connection
#7 - #5 0.9kΩ ~ 1.2kΩ
#8 - #5 4.7Vdc ~ 5.3Vdc
TVS-Diode Measuring Steady-state Measuring Value
Both ends of diode 1kΩ or above
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