Gps Troubleshooting (Sheet 2) - Motorola MTM800 User Manual

TROUBLESHOOTING CHARTS: 450-470MHz

GPS Troubleshooting (Sheet 2)

From Sheet 1
A
Does
TETRACOM
receive several GPS
monitor responses from radio
during boot mode (among
others:"GPS
ready?")
?
Yes
Open the GPS cover
and check all
components
Yes
Are all
components fitted
properly
?
Yes
Replace GPS unit
Tetra Com Command
<SERNUM>
No
Open the GPS cover
and check the 24 pin
flex-line cable to the
main board
No
Replace the missing
or defect component
No
24 pin
flex cable properly
Re-connect the
connected to the main
24 pin flex connector
board?
Yes
No
Before replacing U2
2V DC
check its associated
at U2 Pin 5
components
?
Yes
No
3.0V DC Before replacing U3
at U3 Pin5 check its associated
? components
Yes
No
Replace the
26MHz signal
reference TCXO Y1
at TP6
?
Yes
Test accessory
interface connector
by requesting serial
number.
Run TETRACOM
command.
Yes
No
Radio serial Go to Controller
number displayed troubleshooting
? (sheet 1)
Yes
Replace GPS unit
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