开云体育

Repair tip for these units:

Swap all SMD Electrolytics as long as they have the grey-ish black polarity marking. If they have a glossy dark black marking they are already new. The grey-ish are leaking or will leak in a few days. There is no way around that and if you don't change them while you at it, they will get you sooner or later but 99% sooner. If you keep them in the unit, they will pay back with killing copper layers and eating up the contacts of nearby SMD ceramic caps or resistors. Except a light tint to the color, you cannot see the problem. But if you try to find the problem, you will find out, that the solder contact plate has lost contact to the internal structure.?

On the Host and Slave computer the original THT caps will get dry, sometimes they even burst into flames when getting a short.?

Unfortunately most of the 403x series units where produced, when the industry had its capacitor manufacturing disaster. So if you want to give your 4031 a long live, replace them and replace them all, then check again and replace the ones you missed.
I have already repaired 6 of them in different states and feature sets. I shift another three ahead just cause I do not want ot replace another 350 caps per unit... But damage is not getting better if you leave them in...

Ulrich