9.2 - 10
MTM700
Mobile Radio / Detailed Service Manual TROUBLESHOOTING CHARTS (800MHz)
Warping Failure Troubleshooting
Is there RF power
at the antenna
connector?
Replace U5331
Is there about
0dBm of Tx RF at
TP5401?
Is the
RF power
> 20dBm?
GO to Frequency
Generation Chart
Is the RF power
at the correct fre-
quency?
GO to Low Tx Power
Chart
NO
YES
YES
YES
GO to Tx Frequency
Generation Chart
NO
NO
YES
NO
Tetra Com Script for Tx FGU Test:
TEST_ENTER
DELAY 10
Check for "Radio HW is READY"
MODE IDLE
INTR DIS
FREQ TX 869.925
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 a 50 ohm RF probe.
• Select No System,
• Select TX Test,
• Select TX Frequency 869.925 MHz
• Use 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.
Failure:
PATS parameters WARP_RANGE, WARP_RES, FREQ_ERR
or WARP_SP failed.
START
Содержание MTM700
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