Assembly Instructions

MXI1503-2004 OPERATIONS AND MAINTENANCE
PUB13-10 Rev 1 12
6.2 BASIC TROUBLESHOOTING TECHNIQUES
One of the best tools in troubleshooting is knowing what the nominal figures or typical values of the MXi amplifier
are 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.
6.2.1 No RF Output
 Check for the presence of a valid input stream to the modulator
 Check for outputs from the Driver
 Check for proper power supply voltage and current
 Check for potential connector problems causing either no drive to a module pallet (input connector) or VSWR
(output connector) problems.
 Check the fuses on the driver stages.
 Check to insure each amplifiers interlock is closed.
6.2.2 Output Reduced by 45% (for MXi1503) or 60% (for MXi2004)
If the output is by approximately 45% for an MXi1503 or to 60% for an MXi2004 a possible cause is a total loss of
power from one of the amplifiers. Check the power connections to insure the amplifier is receiving the necessary
+12VDC and +50VDC supply voltages needed for operation. Next check that input and output cables are fully
tightened. Than check the interlock connection to see that it is in fact being shorted by the main controller. A
review of the Main Controllers touchscreen will also help trouble shot the problem by reviewing the logs as well as
the amplifiers status screen.