9.1 - 10 TROUBLESHOOTING CHARTS: 450-470MHz
Warping Failure Troubleshooting
OK
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
RF
power at
antenna connector
> 10dBm
?
RF
level at
TP5401 about
-30 dBm
?
No TX Output Power!
Go to RF Power Amplifier Chart.
No JAVELIN Output Power!
Go to JAVELIN Chart.
FGU failure!
Go to Main Synthesizer Chart.
Is frequency
stable at 469.925MHz
+/-7kHz
?
Send Tetra Com
command "PN 0"
Is frequency
about 7kHz above
469.925MHz
?
DC
at Y5363 pin 1 about
2.4V
?
Replace U5331
Send Tetra Com
command "PN 1FF"
Check for 2.7V DC at
Y5363 pin 4 before
replacing Y5363
Is frequency
about 7kHz below
469.925MHz
?
DC
at Y5363 pin 1 about
0.4V
?
Replace U5331
Replace Y5363
Failure:
PATS parameters WARP_RANGE, WARP_RES, FREQ_ERR or
WARP_SP failed
Tetra Com Script for TX FGU Test
TEST_ENTER
DELAY 18
Check for "Radio HW is READY"
MODE IDLE
INTR DIS
FREQ TX 469.925
L1TIMER ON
TX POW 4
RFTON ATT 0.5
RFTON FRQ 0
RFTON CHN I
FEEDBACK OPEN
MODE RFTONE
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.
Connect the 50 ohms RF probe to the low power RF input on the IFR.
Setup IFR:
Select high power input for measuring power at the antenna connector.
Select low power input for measuring with 50ohms RF probe.
No System,
TX Test,
TX Frequency 469.925MHz
Spectrum Analyser
Set Reference Level to 30dBm.
Run Tetra Com script for TX FGU Test.
Measure RF levels and frequencies with the 50ohms RF probe.
Measure DC levels with a multimeter.
If the cover is removed from the chassis, the RF PA is disabled to
prevent overheating of the FET devices. To measure the power at the
antenna connector, the pressure pad can be used to short the contact
area on the main board. This should be done only for a few seconds.
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6866539D31.book Page 10 Tuesday, March 20, 2007 6:32 PM
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