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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.
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 –
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.
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
When there is no module communication as in PLUS II and PLUS III III – –
Above Yellow Connector of Each Unit : Communication IC between outdoor units.
Above Yellow Connector of Each Unit : Communication IC between outdoor units.
- Other Outdoor Unit- Above Communication Connector : Communication IC between indoor and outdoor unit.
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
Transmitter communication
Indoor Unit communication
Outdoor Unit
No.5
No.7
No.6
Outndoor Unit
communication
83
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