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Troubleshooting
4-3 Appropriate Measures for Different Symptom (cont.)
4-3-3 Communication Error between Indoor and Outdoor Units during Tracking (cont.)
Essential Requirements before PBA Changes in Case of Communication Error Occurrence
1. Find the communication IC near the communication terminal.
Indoor Unit
- Coil side or PTC (SMD) side : Communication IC between indoor and outdoor units.
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.
- Other Outdoor Unit- Above Communication Connector : Communication IC between indoor and outdoor unit.
2. Measure the resistance of the communication IC.
Measurement Method : Measure the No.5- No.6 Pin resistance
3. Defectiveness decision of the communication IC which uses a measurement resistance value.
Judging as Normal
- Each resistance value should be measured in tens of kΩ~to hundreds of kΩ.
- Difference between the two resistance values should be of some number of kΩ.
Judging as defective
- One or both are low with tens of Ω
- One or both of them is open
Samsung Electronics
Indoor Unit
Measure the No.5- No.7 Pin resistance
Outdoor unit
communication between
Outdoor Unit
No.5
No.7
No.6
Indoor Unit communication
Transmitter communication
85
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