The IC most suspect to fail in this circuit is the 4051 (IC31). I'd
replce it first, before doing anything else...
Am 13.04.2018 um 13:21 schrieb
daviddemontis@btinternet.com [PolySix]:
> Hi all
>
> Great group.
> I`m well into a resto of my Polysix.
> I`ve fitted a KiwiSix board and psu.
> I have replaced the paired transitor
> with a 2SC1583 45G.
> I`ve replaced the opto coupler with a VTL5C9
> and I`ve replaced the three ICs 17.18 and 19.
> When measuring IC18 pin7 to TP5 I`m still
> getting -13v.
> Any suggestion on what to change next would
> be much appreciated.
>
> Many Thanks
>
> Dave
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