Spectra V3 Ground Balance problem

[perkun]

hello
I have a spectra v3 in which the input opamp was damaged.
After repair the detector works normally. The depth is good but the ground balance does not work at all.
When tuning manually ferrite gives signal when I approach the coil and it doesn't calibrate.
Regards

[Carl-NC]

Did you use the exact same type of opamp (OP284, I think)? Did you replace any other parts? Did you clean off any flux residue?
You can try doing a recalibration. For that you will need a ferrite and a large jug of salt water. This works best with the 950 coil but may be doable with the 10DD. Let me know if you want to try this, I'll have to get my V3 and figure out how to access it.

[perkun]

Carl thanks for your help! I found calibration instructions in another topic on the forum.
That helped, everything went back to normal.
best regards