Table of Contents
Advertisement
Important things to check before replacing PCB for Communication error
1. Find a communication IC around a communication terminal.
Indoor Unit
- The upper part of the red connector - communication IC for communication between indoor and outdoor units
- The upper part of the blue connector – wired remote controller communication IC
Outdoor Unit
- If there is a module communication as in PLUSII, PLUSII : the upper part of the red connector: communication IC for
communication between indoor and outdoor units
- If there is a module communication as in PLUSII, PLUSIl : the upper part of the yellow connector of each unit: communication
IC for communication among outdoor units
- Other outdoor units – the upper part of the communication connector : communication IC for communication between indoor and
outdoor units
Indoor unit
2. Measure the resistance of communication IC.
How to measure : measure resistance between no. 5 – no.6 Pin
How to measure :
measure resistance between no. 5 – no.7 Pin
3. Diagnosis of communication IC's status using the measured resistance.
Diagnosed as normal
- Each resistance value should be between several tens kΩ-several
hundreds kΩ unit
- The difference between both resistances should be within several
kΩ
Diagnosed as defective
- One or both has low resistance values around several tens Ω
- One or both are open.
Samsung Electronics
Module-type outdoor unit
Troubleshooting
Independent-type outdoor unit
IC no1. Pin mark
No. 5
No. 6 No. 7
4-57
Hide quick links:
Advertisement
Table of Contents
