User's Manual
Table Of Contents
- 1 MXi201V AMPLIFIER–INTRODUCTION
- 2 SAFETY NOTICES
- 2.1 Beryllium Oxide Warning
- 2.2 Other Toxic Materials
- 2.3 Dangerous Voltages
- 3 LARCAN PARTS, ASSEMBLIES, ASSEMBLY DRAWINGS AND SCHEMATIC NUMBERS
- 1 MXi CONTROLLER
- 2 AMPLIFIER INSTALLATION AND STARTUP
- 3 TEST AND TROUBLESHOOTING
- 4 MAINTENANCE
- 5 SERVICE
- 6 TEST EQUIPMENT SETUP
- 7 SPECIFICATIONS
- 1 MXi DUAL PALLET VHF AMPLIFIER
- 1 FUNCTIONAL DESCRIPTION:
- 2 RF PREAMPLIFIER
- 3 POWER AMPLIFIER:
- 4 TWO-WAY SPLITTER/COMBINER
- 5 ADJUSTMENT OF BIAS VOLTAGE TO ESTABLISH PROPER QUIESCENT FET BIAS CURRENT:
- 6 LOW POWER SWEEP AMPLIFIERS
- 1 MXi POWER SUPPLY LAR1000-50-P5337
- 2 POWER SUPPLY DATA SHEET REPRINT
MXiV DUAL PALLET OPERATIONS AND MAINTENANCE
3
3.1
3.1.1
3.1.2
3.1.3
TEST AND TROUBLESHOOTING
BASIC TROUBLESHOOTING TECHNIQUES
One of the best tools in troubleshooting is knowing what the nominal figures or typical values of the MXi amplifier
when it is at its normal performance. If a fault condition occurs, then you can compare the data taken previously
with the present conditions and come up with a reasonable conclusion about what is at fault.
The following describes some fault conditions and possible solutions.
Amplifier Completely OFF
The MXi amplifier is equipped with a fused AC line filter. Although it rarely happens, abnormal conditions such as
power surges may cause the fuse to blow. A blown AC fuse will completely shutdown the amplifier, including a
complete loss of information on the LCD touchpad. In this case, replacing the fuse will rectify the problem.
No RF Output
• Check for proper power supply voltage.
• Check for potential connector problems causing either no drive to a module pallet (input connector) or VSWR
(output connector) problems.
Output Reduced to 25%
If the output is approximately 25%, a possible cause is a failure of one of the devices in the IPA or the PA
amplifier module. These stages have dual devices so that if one fails the output of that stage will be reduced to
quarter power (25%). A measurement of the current drawn by the amplifier will determine if this condition exists.
The IPA usually draws 1A. If the current is 0.5, then this is the case. Similarly, the if one PA pallet draws either no
current, or significantly less current than the other with no drive condition, then this is also the case.
TSM21Q-365 Rev 0 July 17, 2009 MXiV Dual Pallet Operations and Maintenance 17