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

All the parts arrived ,

Now I would like your recommendation for the hot air station setup , how should I go hot and high output to remove the components fast ? or slow/ medium heat , medium flow and take my time and slowly ramp up the temperature until the solder liquefies ? Big , small nozzle ?

lastly I will kapton tape everything around that area and hope for the best , lots of flux , and hope for the best.

Let me know if you have any other tips and tricks how to deal with hot air .

Thank you in advance



wraper:
All of that can be soldered by dual wielding soldering irons, soldering tweezers or using low melting point alloy. I would avoid using hot air on PCB that already popped as much as possible to minimize chances of further damage.
The_Spectrum.A_idiot:
Dear All ,

We kind of made it , now I have 2 errors. 612 and 618.

replaced :
U201
Q202
CR201
Q202-210
Q201
Q211
CR203
Q202

What now ?

Thank you for your help in advance
Kleinstein:
From the description the errors 612 and 618 are essentially the same, a problem with the 500 nA current source or 10 M divider.
A way to check is to measure the 500 nA current externally. If needed with a resistor and voltmeter.
Another point to check could be the resistor readings for the 10 M range (e.g. check 1 M and 4.7 M).
The_Spectrum.A_idiot:
okay so shorting and measuring the μA output :

000. ohm range -999.4 μA
0.1k range - 999.3μA
00.1k range -99.46μA
000.1k range -9.81μA
0.1M range -4.83μΑ
00,1M range - 0.41μΑ
000,1Μ range -0,42μΑ

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