On/Off - Motorola GM140 Service Information

Controlhead GM380/1280 Troubleshooting Flow Chart
3.0 Controlhead GM380/1280 Troubleshooting Flow Chart
3.1

On/Off

Radio can not be switched on via ON/OFF Volume Knob
R0854
Pin TAB
NO
= 5V?
YES
Press and hold
On / Off
Volume Knob
R0854
Pin TAB1
NO
when pressed
=5V ?
YES
J0801 PIN2
YES
> 10V ?
NO
J0801 PIN2
NO
=5V?
YES
Check / Replace
Q0853 / R0853
Check / Replace
R0855 / VR0855 / D0855
C0856
Check / Replace
Volume Pot R0854
Check / Replace
Q0851
Check / Replace
D0852 / R0852
3-7