Motorola GM340 Service Information - Page 20

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Motorola GM340 Service Information
3-2
1.2

Microprocessor

Power Up Alert Tone is OK but volume knob
does not operate and no indicator is on
EXTAL
U0831 Pin 31
= 8.00 MHz ?
YES
RESET
TP0833
= HIGH ?
YES
Measure with scope
while rotating Volume
Data Signal
on J0801 Pin 5
BUS+ ?
YES
Data Signal
on TP0836
SCI_RX ?
YES
Data Signal
on TP0837
SCI_TX ?
TROUBLESHOOTING CHARTS
NO
Check / Replace
R0831 / U0833 / U0831
NO
Check / Replace
C0833 / R0832 / U0831
NO
Check radio controller
Check / Replace
NO
R0837 / R0836
NO
Check / Replace
U0831
YES
Check / Replace
D0831 / R0838