Frequency Response Troubleshooting

If the Frequency Response Test fails by a large error (5 dB or more), this would indicate a faulty assembly.

In order to troubleshoot an RF problem, refer to the MXE Service Guide for troubleshooting procedures and the overall block diagram. Assemblies can be bypassed by injecting 322.5 MHz or 22.5 MHz signals at the appropriate places.

Major assemblies at fault could be: the A12 YTF Assembly; the YTF control signals from the A15 Front End Control Board may be wrong; or the A13 Front End Assembly could be damaged.

If the frequency response test fails at frequencies below 3.6 GHz (Low band), major assemblies to suspect are: the A13 Front End Assembly, A11 Low Band Switch Assembly, or the A15 Front End Control Board.

If frequency response fails at several frequencies between 9 kHz and the maximum frequency range of the analyzer (failures in both High band and Low band), suspect assemblies that are common to both High and Low bands such as a damaged Input Attenuator or the A11 Low Band Switch Assembly.

If the frequency response test fails in the Preamp On path, run the Attenuator Slope (Preamp On) Adjustment.