Motorola MTM800 - GPS Troubleshooting (Sheet 2)

TROUBLESHOOTING CHARTS: 450-470MHz 9.1 - 21
GPS Troubleshooting (Sheet 2)
No
Does
TETRACOM
receive several GPS
monitor responses from radio
during boot mode (among
others:"GPS
ready?")
?
Open the GPS cover
and check the 24 pin
flex-line cable to the
main board
No
24 pin
flex cable properly
connected to the main
board?
Re-connect the
24 pin flex connecto
r
No
2V DC
at U2 Pin 5
?
Before replacing U2
check its associated
components
No
3.0V DC
at U3 Pin5
?
No
26MHz signal
at TP6
?
Replace the
reference TCXO Y1
Test accessory
interface connector
by requesting serial
number.
Run TETRACOM
command.
No
Are all
components fitted
properly
?
Replace the missing
or defect component
Replace GPS unit
Open the GPS cover
and check all
components
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
A
From Sheet 1
Before replacing U3
check its associated
components
Radio serial
number displayed
?
Go to Controller
troubleshooting
(sheet 1)
Replace GPS unit
Tetra Com Command
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6866539D31.book Page 21 Tuesday, March 20, 2007 6:32 PM