9.1 - 4
MTM700
Mobile Radio / Detailed Service Manual
TROUBLESHOOTING CHARTS (400MHz)
Controller Troubleshooting (Sheet 1)
Failure:
No "Radio HW is READY" message on Tetra Com screen 10 sec after
the supply voltage has been applied.
Communication with PATS failed.
Start
Check components and
connections between TP's and
accessory connector.
Yes
Digital DC supply failure!
Go to DC Supply Chart.
No
Disassemble main board from radio chassis.
Check main board visually.
Check fuses F0301and F0302 on the main board.
2V DC at
U0306 pin 1
?
3V DC at
U0305 pin 1
?
3V DC at
U0305 pin 5
?
5V DC at
U0303 Pin 3
?
No
Send Tetra Com command "MODE" several times for the followings
test and measure the test point signals with a scope.
Data
activity on
TP0404, TP0405
and TP0402
?
No
Yes
Data
activity on
TP0401
?
Yes
No
Check components and
connections between TP
and accessory connector.
Yes
No
Measure the DC voltages of the
2V and 3V regulators.
Yes
No
Before replacing U0306 check
for 5V DC at pin 8 and check
associated components.
Yes
Before replacing U0305 check for
5V DC at pin 8 and check
associated components.
Before replacing U0305 check
associated components.
A
ZWG0130953-O
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