Motorola MTM800 - JAVELIN Troubleshooting

TROUBLESHOOTING CHARTS: 450-470MHz 9.1 - 13
JAVELIN Troubleshooting
Start
Failure:
Tetra Com Script for TX Power Test
TEST_ENTER
DELAY 18
Check for "Radio HW is READY"
MODE IDLE
INTR EN
FREQ TX 429.925
L1TIMER ON
TXPOW 6
MODE TXNDC
Use MODE IDLE to terminate transmit mode.
Connect the radio's accessory connector to the
Tetra Com interface.
Connect the radio's antenna connector to the
high power RF output on the IFR.
Run Tetra Com script for TX Power Test
Measure RF levels with the high impedance
RF probe and millivoltmeter.
Measure DC levels with a multimeter.
No or low JAVELIN output signal level.
2.8V DC at
C5875 ?
No
Yes
TX DC supply failure
Go to DC supply chart
5V DC at
TP5811?
No
Yes
5V DC at
Q5804 p
No
Yes
Check Q5301
5V DC at
TP5841 ?
No
Yes
> 2V DC at
No
Yes
Check Q5802; Q5804
0V DC at
R5855 ?
Yes
No
Re
p
Yes
No
Yes
RF level at
TP5801 about
200mV ?
Check components
between TP5801 and
T5801
No
Yes
Yes
No
RF level at
TP5811 about
200mV ?
No
Before replacing
U5809 check
R5850..R5854
Yes
Change T5802
RF level
bot h s ides of L580
t 130...200mV ?
at 9
abou
RF level at C5803;
C5813 about
400..600mV ?
No TX VCO signal
Go to TX frequency
generation chart
No
Before replacing
U5809
check R5850 to R5854
lace U5810
Is AC about 750m Vp-p
measured with a scope
at TP5805…..TP5808?
And DC 1.9V?
Q5802
Pin 4
in2 ?
6866539D31.book Page 13 Tuesday, March 20, 2007 6:32 PM