Simoco EMEA Ltd SB2K5354O2O2V Manual De Usuario
SGD-SB2025NT-TUM, Part 1
Jan 12
Page 58
FAULT FINDING
7 FAULT FINDING PROCEDURES
The following test equipment may be required for the tests detailed in this section:
•
PC with MxTools (SB2025 Base Station Programming Utility).
•
RF Test Set (e.g. HP 8920 or equivalent).
•
Oscilloscope.
•
RF Power Meter (capable of measuring to 60 Watts continuously).
•
Multimeter.
•
+13.8 V DC Power Supply (capable of supplying 15 Amps).
•
Network Analyser.
•
SB2025 Test Jig (Optional).
7.1 SB2025
B
ASE
S
TATION
The following tests will help diagnose faulty modules.
1.
Check that all of the required connections to the SB2025 Radio are made.
2.
Check that all of the interconnecting cables to each of the modules and to the Motherboard
are correctly installed.
are correctly installed.
3.
Check the voltage supply to the SB2025 by measuring both sides of Fuse 1 located on the
Micro Controller PCB. If necessary, replace the fuse.
Micro Controller PCB. If necessary, replace the fuse.
4.
Check that the ‘PWR’ LED is lit. If not, go to Section 7.2.
5.
Using MxTools, check that the frequency tables and configuration settings are correct.
7.1.1
Transmitter Section
1.
Connect the output of the PA Module to a Comms test set or a RF power meter.
2.
Using MxTools Diagnostic’s, check the Tx VCO locking voltage is between 2 V – 18 V and
there is no Tx VCO ‘Unlock’ alarm displayed.
there is no Tx VCO ‘Unlock’ alarm displayed.
3.
If the locking voltage is out of specification or an ‘Unlock’ alarm is displayed then go to
Section 7.4.
Section 7.4.
4.
Using the Software PTT in MxTools, key up the Tx.
5.
If the output power of the SB2025 is LOW, using MxTools, check that the ‘Transmit Power’
control is not on a low setting.
control is not on a low setting.
6.
Adjust the ‘Transmit Power’ control towards maximum looking for an increase in the RF
power output level. If there is no substantial change, go to the diagnostics screen and check
that the Forward power and the Reflected power levels are not abnormal.
power output level. If there is no substantial change, go to the diagnostics screen and check
that the Forward power and the Reflected power levels are not abnormal.
Note.
If there is a high reflected power indication, the SB2025 Firmware would hold the PA
power low.
power low.