Troubleshooting Charts; On/Off - Motorola GM140 Service Information

1.0 Controlhead GM140/340/640 Troubleshooting Chart
1.1

On/Off

Radio can not be switched on via ON/OFF Volume
R0823 Pin TAB
= 5V ?
YES
Press and hold
On/Off Volume Knob
R0823 Pin TAB1
when pressed
= 5V ?
YES
J0801 Pin 2
> 10V ?
NO
J0801 Pin 2
=5V ?
YES
Check / Replace
Q0822 / R0821

TROUBLESHOOTING CHARTS

Check / Replace
NO
R0822 / VR0822 /
D0822
NO
Check / Replace
Volume Pot R0823
Check / Replace
YES
Q0821
Check / Replace
NO
D0821 / R0852
Chapter 3