Electronics > Repair
Agilent 34401A Bubble on PCB ... can it be saved ? (SOLVED)
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The_Spectrum.A_idiot:

--- Quote from: Dr. Frank on September 24, 2024, 05:04:47 pm ---and the other currents, 5µA and 10µA?

Does it now pass the test?

That means, DIP 8 is obsolete, and you have used an SOIC / DIP adapter? Or was it an SO package initially? I don't remember..

--- End quote ---

Let me solder everything back except the cap and see how it goes.
Dr. Frank:
Great!
I have to leave for basketball in 20min., so maybe I can't answer your questions later.
The_Spectrum.A_idiot:
still Failed. ( I soldered everything back as they were. )

I managed to find on ebay original OP amps.

Let's hope this is the case.(changing to an original part)

Thank you for your time !
The_Spectrum.A_idiot:

--- Quote from: Dr. Frank on September 24, 2024, 05:04:47 pm ---and the other currents, 5µA and 10µA?

Does it now pass the test?

That means, DIP 8 is obsolete, and you have used an SOIC / DIP adapter? Or was it an SO package initially? I don't remember..
This type is correct, anyhow

--- End quote ---

Well I managed to solder it on .. regardless if it was a different package ... pinout was the same so I just made due.
Kleinstein:
A damaged capacitor C210 is possible, e.g. due to PCB stress from the bubble. For a test one could try without or with a different low leakage type, possibly also through hole and a slight larger values like 330 pF.  C0G capacitors should be reasonable low leakage, also for more normal types.

With the flux it is also possible that just re-soldering effects leakage on the PCB. The flux linked should be easy to clean and at least for a first test should even be OK without extra cleaning. Excessive flux that did not got hot may however be a problem and likely needs cleaning.

The AD706 should still be available and the photo shows a SO8 foot-print, not a dip. For the wide / narrow version one often can bridge the gap, though this can make PCB cleaning a bit more tricky.
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