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

I have bought an Agilent 34401A with the following errors on self test : 621 , 619 , 619 , 617, 615, 613 ,612

after opening it up I see this following abomination.




is there hope ? or I should give up ?

I have another post with some issues with said meter. I will try to get some test procedure done , BUT mine mostly works on DC except continuity that is flaky at best non trustworthy at worst.

I will try to test the rest of the functions somehow ( as I don't have any standards to test it against )

Let em know what you think.

Thank you in advance for your time
iMo:
It looks like the U110 (MC34081BD) has been smoked (plus minus something around it, double check). The pcb around it has been delaminated, but unless some vias are broken, the pcb may work fine..
tszaboo:
Water damage. With enough determination you can fix it.
Kleinstein:
It looks like the OP-amp U110 get a bit hot. That is part of the amps part, as an auxiliary buffer. If that is the only thing really broken it would be relatively easy to replace, as it is not so critical a part.


The_Spectrum.A_idiot:
Dear All ,

So I checked almost any VIA I can see on the problematic part of the board. All seems good ( suspiciously someone was in here before and all the vias are filled with solder.... ) anyway.

After Tinkering a bit more with the meter.
-I have V DC
-Continuity partial sometimes it works sometimes it does not - Diode mode is also dead  same issue as Continuity
- DC A ( i managed to check up to 24mA and it works :D )
- Resistance is dead ( any resistor shows 0 ohms ) and at the beginning in the Mohms random.

Is there a guideline how to continue ?

Before I start replacing things since the PCB is not at its best I would like to test all theories before loading the parts canon.

Thanks
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