HP 3330B Automatic Synthesizer A35 power supply board damage

[Cubdriver]

Hi All -

I was recently given an old HP 3330B Automatic Synthesizer, and was told a capacitor had burned up inside, and damaged a board.  I've poked around inside and found the damage - C13 - called out in the parts list as a 0.1 uF, 100 V ceramic capacitor (don't recall EVER seeing a a ceramic cap fail so spectacularly!) on the A35 board in the power supply section.  It appears that a repair effort was made and that a burned trace was jumpered and a new ceramic cap bodged in, but there's still an ugly burned crater on the board.

Board overall:


Detail of damage:


The A35 board is in the small isolated cage at the rear center of the chassis, under the flat aluminum cover with two oblong holes:


Board partially removed from card cage:


Does anyone have a 3330B, and if so, would you please take a picture of that area of the A35 board and post it here so I can see what it originally looked like?  Thanks.

-Pat

[wn1fju]

See attached photo.  I hope you appreciate this - my 3330B was at the bottom of a stack of about 10 heavy pieces that I had to move away.  Oh, my aching back!!!

[Cubdriver]

Perfect!  Thank you very much for making the effort to pull and photograph it!  (Why is it that the instrument you want is almost always at the very bottom of the stack?)

I have a bad feeling that this thing is going to have some serious issues - I’ve never seen a ceramic cap go out in a blaze of glory like that - you’d think there had been a dipped tantalum one there.

Once again, much appreciated!

-Pat