Troubleshooting
Samsung Electronics 4-29
1. Find the communication IC near the communication terminal.
· Indoor Unit
·- Above Red Connector : Communication IC between indoor and outdoor units
·- Above Blue Connector : Communication IC for cable remote control.
· 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
Measure the No.5 - No.7 Pin resistance
Measure the No.5 - No.8 Pin resistance
3
. Normal and defective judg ment is tested for communication IC by using measured resistance.
· Judging as Normal
- Each resistance value should be measured in tens of k~to hundreds of k.
- Difference between the two resistance value
s should be of some number of k.
· Judging as defective
- One or both are low with tens of
- One or both of them is open
غ AM038/048/055KXWD
✳✳
Indoor Unit
Display IC No. 1 pin
No.5 No.6 No.7
Transmitter communication IC
Indoor communication IC
Ǒ Essential requirements before PCB changes in case of communication error occurrence
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