Electronics > Repair
Agilent 34401A Bubble on PCB ... can it be saved ? (SOLVED)
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factory:
To me it looks as if this has been worked on before, some evidence of hand soldering and possibly someone used a lot of heat to desolder the 8 pin IC, i.e. too much heat from something hotair based?

David
The_Spectrum.A_idiot:

--- Quote from: iMo on September 12, 2024, 05:49:19 pm ---When the Vcc and Vee of the opamps shows +/-18V then the serial zener diodes got shorted (around 3-4 pairs there on the pcb). It happens when you short +/15V somewhere..
The 3.2V zeners in series with 18.2V create +/-15V for opamps..

--- End quote ---

OP-amps , do you have a name for them ?
U110? U201 ? U303?
The_Spectrum.A_idiot:

--- Quote from: factory on September 12, 2024, 05:50:41 pm ---To me it looks as if this has been worked on before, some evidence of hand soldering and possibly someone used a lot of heat to desolder the 8 pin IC, i.e. too much heat from something hotair based?

David

--- End quote ---

Looks like it. yes that pin seems to be floating. and not connected anywhere.
The_Spectrum.A_idiot:

--- Quote from: iMo on September 12, 2024, 05:56:50 pm ---Almost all in the ADC and perhaps in other parts of the system. Look into the Service Manual (easy to download).
Kdyz vsechno selze procti si navod.. :)

--- End quote ---

I am trying to RT*M. But I am a bit out of my depth as you can see.
I am trying to understand what is allegedly the issue. Nevertheless , I will try to figure it out , thanks !
iMo:
People here know the 34401 pretty well. So chances are you will get it working..
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