Archive for May 8, 2015

Teardown and Repair of an Agilent E3620A Dual Power Supply Plus IC Decapping Tutorial

In this episode Shahriar completes the repair of the Agilent E3642A power supply with the missing display processor. Thanks to Gerry Sweeney a replacement IC is found and the unit is back to life! Furthermore, the teardown and repair of an Agilent E3620A dual power supply is also shown. The power supply has suffered some liquid damage on several ICs which must be replaced. The PCB has also sustained some damages and has to be repaired. After the rapier, the functionality of the unit is verified.

In order to examine the damage to the ICs from the Agilent E3642A repair, a de-capping process using nitric acid is shown. The VFD controller and two processor with different mask ROM sets are de-capped using this method. The heated nitric acid dissolves the package epoxy revealing the Silicon dies. The dies are then examined under the microscope for comparison and analysis.

Teardown, Repair and Analysis of an Anritsu MS2721A 7.1GHz Portable Spectrum Analyzer

In this episode Shahriar takes a look at an Anritsu MS2721A portable spectrum analyzer which does not completely boot up. After displaying the message “Application Running!” the unit no longer advances to the main measurement screen. After intentionally corrupting the firmware, a system menu is observed.

During the teardown of the unit, various DC-DC converters are examined along with a basic overview of the Linear Technologies DC-DC converter datasheet. The main problem is traced to a faulty SRAM IC. After replacing the IC the unit completes the boot process. Various simple experiments are performed to ensure the unit’s functionality and correct operation.

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