Chapter 3 Troubleshooting Charts; Control Head Cdm750 / Pro3100 Troubleshooting Flow Charts - Motorola CDM Series Detailed Service Manual

Chapter 3
TROUBLESHOOTING CHARTS
1.0

Control Head CDM750 / PRO3100 Troubleshooting Flow Charts

1.1 Troubleshooting Flow Chart for On/Off
Radio does not turn on when On/Off/Volume Knob is
pressed
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
Section 2: 3-1
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