Motorola GM640 Service Information - Page 26
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3-8
3.2
Microprocessor
U0871
Pin 73 EXTAL
= 8 MHz
YES
1
Power Up Alert Tone is audible on external speaker but volume
knob does not operate and no indicators are on
YES
NO
Check / Replace
R0873 / U0873 /
U0871
TP0876
=5V ?
NO
Check / Replace
R0866 / C0866 /
Q0866 / R0863
TROUBLESHOOTING CHARTS
NO
TP0866
= 0V
YES
Check / Replace
R0861 / R0862 / D0861
C0861 / C0862 / U0861
C0863 / C0864 / C0865