Motorola GM660 Service Information - Page 24
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3-6
2.4
Backlight
Power Up Alert Tone is OK, volume knob does operate,
indicator/display is on but no backlight
U0831 Pin 58
is toggling ?
YES
Base of
Q0934
> 0.7V ?
YES
Collector of
Q0934
>5V and < 11V ?
YES
Check / Replace
Q0933 / R0947 / R0948
TROUBLESHOOTING CHARTS
NO
Check for shortage
U0831
NO
Check / Replace
R0847 / C0843 / R0943
Check / Replace
NO
Q0934 U0931 /R0941 /
R0942 / R0944 / R0945