Troubleshooting
Samsung Electronics 4-27
Yes
Indoor/outdoor communication error (1 min.)
(
&SSPS$PEF&
)
(Continued)
Continued
Check the communication circuit of the main
PBA of the outdoor unit.
1. Is there a problem 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
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 0.9k ~ 1.2k
Measuring after separating the communication
connection
#7 - #5 0.9k ~ 1.2k
#8 - #5 4.7Vdc ~ 5.3Vdc
TVS-Diode Measuring Steady-state Measuring Value
Both ends of diode 1k or above
Communication B (#7)
Communication A
(#6)
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