Motorola GM660 Service Information - Page 30
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3-12
3.6
Display Backlight
Power Up Alert Tone is audible, volume knob does operate,
display is on but no display backlight.
U0871 Pin 24
is toggling ?
YES
Base of Q0963
> 0.7V ?
YES
Collector of
Q0963
>5V & < 11V
?
YES
Check / Replace
Q0961 / R0975 / R0977
TROUBLESHOOTING CHARTS
Check for shortage
NO
U0871
Check / Replace
NO
R0965 / C0963 / R0967
Check / Replace
Q0963 / U0941 / R0961
NO
R0963 / R0969 / R0971