Teardown & Repair of an Agilent N9020A MXA 10Hz – 8.4GHz Spectrum Analyzer (Parts 1 & 2)

In this episode Shahriar repairs an Agilent N9020A MAX Spectrum Analyzer. The instrument is well equipped with real-time capability and direct I/Q input ports on the front panel. The instrument does not show the correct signal levels and fails internal calibration.

After a brief teardown, the block diagram of the instrument is carefully examined for potential failure points. It is determined that front-end switch and mechanical attenuator is likely faulty. Teardown of the unit reveals significant damage to the attenuator due to some high-power at the input. Unfortunately, this also implies that the front-end RF selector and pre-amplifier modules are also damaged. In the second repair video, the front-end module is disassembled and damage to the dies can be observed.

Luckily, a relatively inexpensive front-end (SSLAM) unit is sourced from eBay and the repair is completed. The performance of the unit is verified after the repair and the front-end I/Q input functionality is demonstrated.

Part 1:

Part 2:

One comment

  1. Sam H Reaves says:

    I believe that you can order the pads separately from Keysight for those attenuators. I have ordered ones for other attenuators in the past. Probably 35 to 50USD each. Just contact them with the attenuator part number and they can probably fix you up.

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