Motorola 6864115B62-C - Chapter 3 TROUBLESHOOTING CHARTS

Chapter 3
TROUBLESHOOTING CHARTS
1.0 Controlhead GM140/340/640 Troubleshooting Chart
1.1 On/Off
Check / Replace
R0822 / VR0822 /
D0822 / C0822
Radio can not be switched on via ON/OFF Volume Knob
NO
YES
YES
NO
R0823 Pin TAB
= 5V ?
R0823 Pin TAB1
when pressed
= 5V ?
Check / Replace
Volume Pot R0823
NO
YES
J0801 Pin 2
> 10V ?
Check / Replace
Q0821
Check / Replace
Q0822 / R0821
YES
NO
J0801 Pin 2
=5V ?
Check / Replace
D0821 / R0852
Press and hold
On/Off Volume Knob