Motorola GM328

Controlhead GM398 Troubleshooting Flow Chart 3-7
3.0 Controlhead GM398 Troubleshooting Flow Chart
3.1 On/Off
R0854
Pin TAB1
when pressed
=5V ?
J0801 PIN2
> 10V ?
J0801 PIN2
=5V?
Check / Replace
Q0853 / R0853
YES
NO
YES
NO
YES
NO
Check / Replace
D0852 / R0852
Check / Replace
Volume Pot R0854
Check / Replace
Q0851
Radio can not be switched on via ON/OFF/Volume Knob
YES
R0854
Pin TAB
= 5V?
NO
Check / Replace
R0855 / VR0855 / D0855
C0856
Press and hold
On/Off/
Volume Knob