Gps Troubleshooting (Sheet 1) - Motorola MTM800 User Manual

9.1 - 20

GPS Troubleshooting (Sheet 1)

Failure: No position fix after 15minutes!
antenna a "clear view"
Yes
Disconnect the GPS cable from
the radio and measure the DC
voltage applied to the inner
conductor of the RF cable.
accessory connector
Start
No
Has the GPS
to sky??
No
Does 5.5V DC
Open GPS cover and check visually
apply to the inner
the voltage regulators U1 and its
conductor of the
associated components (including
RF cable?
L1, and R12)
Yes
Connect radio's
to TETRACOM
interface, run
TETRACOM
and power on
the radio
A
See Sheet 2
Move GPS antenna into an
area with a "clear view" to sky.
No
Are U1 and its
associated components
fitted properly?
Yes
Measure the DC
voltage at U1 Pin 4
No
13V DC at U1
Pin 4 (@nominal
battery voltage of
13.2V)?
Yes
Replace U1
TROUBLESHOOTING CHARTS: 450-470MHz
Replace the missing or
defect component.
No
24 pin flex
cable properly
Re-connect the
connected to the
24 pin flex connector
main board?
Yes
Go to DC
troubleshooting
Mainboard