Samsung AM072FXVAFH series - Page 123

Troubleshooting
Samsung Electronics 4-27
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Essential Requirements bef ore PCB Changes in Case of Communication Error Occurrence
1. Find the communication IC near the communication terminal.
Ɣ Indoor Unit
-
Above Red Connector : Communica tion IC between indoor and outdoor units.
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Above Blue Connector : Communication IC for cable remote control.
Ɣ Outdoor Unit
-
When there is module communication as in PLUS II and PLUS III –
Above Red Connector of Main Unit : Communication IC between indoor and outdoor units.
-
When there is no module communication as in PLUS II and PLUS III –
Above Yellow Connector of Each Unit : Communication IC between outdoor units.
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Other Outdoor Unit- Above Communication Connector : Communication IC between indoor and outdoor unit.
2. Measure the resistance of the communication IC.
Ɣ Measurement Method : Measure the No.5 - No.6 Pin resistance
Measure the No.5 - No.7 Pin resistance
Measure the No.5 - No.8 Pin resistance
3. Normal and defective judgment is tested for communication
IC by using measured resistance.
Ɣ Judging as Normal
- Each resistance value should be measured in tens of k~to hundreds of k.
- Difference between the two resistance values should be of some number of k.
Ɣ Judging as def ective
- One or both are low with tens of

- One or both of them is open
Display IC No. 1 pin
No.5 No.6 No.7
Indoor Unit
Outdoor Unit
Outdoor unit
communication between
Indoor Unit communication
Transmitter communication