User Guide

Flow chart of Troubleshooting and Circuit Diagram 5-16
5-9 Ring Indicator
Ring Indicator LED
does not work
Check the circuit related to U100U100 pin 5 = 3.3 V ?
Is Green color LED of 3LEDs
correctly work ?
Check Q4, R14, LED6
END
Check Q3, R12, LED6
Ye s
No
Ye s
Ye s
No
No
No
Check Q2, R13, LED6
Ye s
Is Red color LED of 3LEDs
correctly work ?
Is Blue color LED of 3LEDs
correctly work ?