◊ From above check,we found appearance and lighting on all buttons were normal.
3. Checked the lighting at repair engineer section by test used PCB of model 310A-DA and PCB of model 150A-DA
because PCB of model 310A-DA and PCB of model 150A-DA similares.
3.1 Testing the lighting on button by PCB of model 310A-DA and found the lighting show on button was normal.
Please see as the below pictures.