Samsung AM072BXV Series Service Manual page 165

Troubleshooting
4-4 Case study for trouble shoots (cont.)
4-4-5 Case study – E201 (Communication error between indoor & outdoor unit) (cont.)
■ Action
Check wiring to F1,F2 terminal block
Comm. IC check
Check ODU PBA setting
Check Other error occurrence
Wiring broken check
■ Solution
- Change the wire to new one
• How to check the Comm. IC
■ Measurement Method
Measure the No.5- No.6 / No.5- No.7 / No.5- No.8 Pin resistance
■ Judgment
- Normal : Each resistance value = in hundreds Ω ~ to hundreds of kΩ.
- Defective : One or both are low with tens of Ω
One or both of them is open
Samsung Electronics
Action
Indoor Unit communication
NG – middle of the F1 wire was broken
Transmitter
communication
Outndoor Unit
communication
Outdoor Unit
Result
OK
OK
OK
OK
Display IC No. 1 Pin
No.5
No.6 No.7
159