Indoor/Outdoor Communication Error (1Min.) (Error Code: E202) - Samsung AC018JN4DCH/AA Service Manual

Indoor/outdoor communication error (1 min.)
( )
(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
Location
Measuring
Point
Communication IC Measuring (Port)
TVS-Diode Measuring
Both ends of diode
Samsung Electronics
Continued
Yes
Communication IC Measuring Part
(Circuit Diagram)
#5-GND, #6- Communication A, #7-
Communication B, #8-Vcc
#6 - #5
#7 - #5
#8 - #5
Example of Measuring
Communication IC
Communication B (#7)
Communication A
Steady-state Measuring Value
COM 1(RED)
0.9kΩ ~ 1.2kΩ
0.9kΩ ~ 1.2kΩ
4.7Vdc ~ 5.3Vdc
Steady-state Measuring Value
1kΩ or above
Example of Measuring
TVS-Diode
(#6)
Remark
Measuring after separating the communication
connection
Troubleshooting
4-29