Motorola GM140 Service Information page 21

Controlhead GM160/360/660 Troubleshooting Flow Chart
2.0 Controlhead GM160/360/660 Troubleshooting Flow Chart
2.1 On/Off
Radio can not be switched on via ON/OFF Volume Knob
NO
R0823 Pin TAB
= 5V ?
YES
Press and hold
On/Off Volume Knob
NO
R0823 Pin TAB1
when pressed
= 5V ?
YES
YES
J0801 Pin 2
> 10V ?
NO
NO
J0801 Pin 2
=5V ?
YES
Check / Replace
Q0822 / R0821
Check / Replace
R0822 / VR0822 /
D0822 / C0822
Check / Replace
Volume Pot R0823
Check / Replace
Q0821
Check / Replace
D0821 / R0852
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