Motorola GM1280 Service Information - Page 27

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Motorola GM1280 Service Information
Controlhead GM380/1280 Troubleshooting Flow Chart
3.3
Microprocessor
1
Measure with scope
while rotating
Volume Pot
Data Signal
on J0801
Pin 5 BUS+
?
YES
Data Signal
on TP0877
SCI_RX
?
YES
Data Signal
on TP0878
SCI_TX
?
YES
Check / Replace
D0872 / R0887
Check
NO
Radio Controller
Check / Replace
NO
R0888 / R0889
Check / Replace
NO
U0871
3-9