9.2 - 2 MTM700 Mobile Radio / Detailed Service Manual TROUBLESHOOTING CHARTS (800MHz)
Main Function Test Chart (Sheet 1) >> Startup Procedure <<
"Radio HW is READY"
shown on Tetra Com
Screen
?
Disassemble the main board from the radio
chassis.
Check the main board visually.
Check the supply voltage path of the main
board for a low impedance path to ground.
Check the following components for a low
impedance path to ground: PA FET devices
trans-sorb diode VR0300.
After removing any short to ground or
replacing any faulty component start the
procedure again.
Yes
Start Tetra Com software.
Connect the radio's accessory connector to the Tetra Com interface.
Connect the radio's antenna connector to the RF input on the IFR
Set the power supply to 13.2V and 1A current limit.
Connect the radio's DC connector to the power supply.
Measure the DC current.
Start
Within about 10sec the
Tetra Com screen must
show "Radio HW is
READY"
DC current <1A
?
Yes
No
Setup IFR to :
No System,
TX Test,
Spectrum Analyser
TX Frequency 869.925MHz
Run Tetra Com script for TX test
Controller failure!
Go to Controller Chart
No
Tetra Com Script for TX Test
TEST_ENTER
DELAY 10
Check for "Radio HW is READY"
MODE IDLE
PWRTUNEINTR DIS
FREQ TX 869.925
L1TIMER ON
TXPOW 6
TX_ATT 6
RFTON FRQ 0
RFTON CHN IQ
RFTON ATT 0.45
FEEDBACK CLOSE
MODE RFTONE
Use MODE IDLE to terminate transmit mode
TX power >10W
?
No
Yes
TX frequency
offset stable and within +/-
2kHz
?
No
TX power failure!
Go to RF Power Amplifier Chart
FGU failure!
Go to TX FGU Chart
Yes
A
See Sheet 2
ZWG0130962-O
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