Here are some photos in case people use this as reference in future.
Fix for ohm 304.x failing on analog board #4
![](http://xdevs.com/kei2001/.hglf/photos/K4/ohm_1_s.jpg)
Replace TG128 selected JFETs Q320,Q324 (near blue resistor network, on left side) and Q312 (near caddock network).
After doing so 304 errors are gone, resistance measurements fixed.
Now recap (remove old capacitors and replace with new ones). I used 1000uF 50V instead of 1000uF 35V for C116 and C117 positions. They are same diameter and pitch, just taller.
![](http://xdevs.com/kei2001/.hglf/photos/K4/recap_1_s.jpg)
Remove analog board from chassis, prepare caps.
![](http://xdevs.com/kei2001/.hglf/photos/K4/recap_2_s.jpg)
Remove all capacitors and clean board. Make sure no damaged traces or electrolyte corrosion anywhere.
![](http://xdevs.com/kei2001/.hglf/photos/K4/recap_3_s.jpg)
Closeup on 4 caps which usually leak most on old 2001's.
![](http://xdevs.com/kei2001/.hglf/photos/K4/recap_4_s.jpg)
Backlit photo to show traces in inner layers under capacitors area.
![](http://xdevs.com/kei2001/.hglf/photos/K4/recap_5_s.jpg)
Backside backlit photo
![](http://xdevs.com/kei2001/.hglf/photos/K4/recap_6_s.jpg)
Clean holes with toothpick, so you can put new capacitors in place.
![](http://xdevs.com/kei2001/.hglf/photos/K4/recap_7_s.jpg)
Soldered caps on analog PCB.
![](http://xdevs.com/kei2001/.hglf/photos/K4/recap_8_s.jpg)
1000uF 50V capacitor in mains switching circuit.
Also while trying fix 407.x errors and swapping components seems I got backwards and borked something else, as now selftest steps 402.1, 404.1 to 404.5, 405.2, 405.4, 405.6, 405.8, 406.6 are failing too!
Oh-oh, time to spend some time and recover schematics for all AC-measurement related circuit.
![Sad :(](https://www.eevblog.com/forum/Smileys/default/xsad.gif.pagespeed.ic.L3FGyzQrjB.png)