Electronics > Repair
Agilent 34401A Bubble on PCB ... can it be saved ? (SOLVED)
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coromonadalix:
you do have the schematics ...

http://www.ko4bb.com/getsimple/index.php?id=manuals


type 34401a in the search box   and magic   loll
chilternview:
The error numbers are saying the ohms function is broken, check Q202-Q211, U201 and CR201/202.
The_Spectrum.A_idiot:

--- Quote from: coromonadalix on September 12, 2024, 06:32:06 pm ---you do have the schematics ...

http://www.ko4bb.com/getsimple/index.php?id=manuals


type 34401a in the search box   and magic   loll

--- End quote ---

I got the schematics from keysight directly.... as service manuals and user manual. I can't expect them to be different direct from source.
Allas I will check you the link , Thank you.
coromonadalix:
if you have them   that's ok

the worst from the bubble would be vias, they could have snapped open, and be very careful not to overheat parts before removal


i've seen some,  drilling an hole where there is no parts and filling the space with superglue  while giving some pressure on both sides, to bring back layers together and slimming down the bubble expansion  ... but not sure if i would try this,  it does seem recoverable, and it could continue to work fine

patience and be meticulous ... you'll get it repaired

i hope the special asic has not been damaged  ....

Smokey:
The light-through-the-board photo makes it look like a 2 layer board (with no ground plane??).  That should be easily fixable in this case.  Just need to reconnect top to bottom, and don't need to worry about inner layer connections for the vias.  lucky.
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