? #544 Agilent E3646A Display Board Repair - Rotary encoder and U7 N80C51BH 34401-88804 Failure
I repair an Agilent E3646A power supply which has display board issues, a faulty rotary encoder, and a failed U7 N80C51BH microprocessor.
The display board needed to be repaired as the rotary encoder failed, and U7 N80C51BH 34401-88804 failed too due me to slipping with a probe!
I dismantled the encoder and cleaned its contacts which restored its operation, and then I programmed a new Atmel AT89S51 microprocessor using a TL866II programmer and PLCC44 adaptor for the correct 34401-88804 firmware to replace the failed N80C51BH (U7).
Excellent blog page covering various aspects of the power supply:
https://www.dcddcc.com/blog/2017-12-02-agilent-e3646a-power-supply-repair.htmlAll relevant files for this repair are also available to my Patreon supporters:
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