Stihl BT 131 - Audio Trouble (No Sound)

VIDEOCON INDUSTRIES LTD. V59-CTYPE
The information in the specification is subject to change without notice
23
5) Audio Trouble (no sound)
Check if audio signal
Input is normal
NG
NG
OK
NG
OK
Check if Speaker ON/OFF set
or if mute function is off
Check external
audio equipment
Set it ON
Check if the voltage (1.5V) on
pin13 14 of N901？
Check N901 or
Change N901
Check if The Wave ON pin4 of
N902 is OK?
NG
OK
Check N902 &
peripheral Circuit
Check the voltage (6.4V) on
pin
1
46 39 36
of
N90
3
？
Check N903 N902
& peripheral circuit
NG
OK
OK
OK
Check if XS902 XS901 is OK?
Repair the circuit
Change Speaker
NG