How to test optical coupler
Testing Tool
1. Pointer device

2. DC Source

3. Multimeter

4. Soldering iron

optical coupler Type
8PIN like PC923, A7800
optical coupler 8pin Testing method
1) Supply 15V into 8 pin(VCC) 7PIN(gND) of PC923
You need to weld 2 wires into 7, 8 pin so that you can supply power for 7, 8 pin conveniently
2) Use Pointer Device to supply DC current almost 10mA for 2 and 3 pin of optical coupler
