On/Off - Motorola 6864115B62-C Detailed Service Manual

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
R0823 Pin TAB
Press and hold
On/Off Volume Knob
R0823 Pin TAB1
when pressed
J0801 Pin 2
> 10V ?
J0801 Pin 2
Check / Replace
Q0822 / R0821
NO
= 5V ?
YES
NO
= 5V ?
YES
YES
NO
NO
=5V ?
YES
Check / Replace
R0822 / VR0822 /
D0822 / C0822
Check / Replace
Volume Pot R0823
Check / Replace
Q0821
Check / Replace
D0821 / R0852
3-3