[sdiy] Juno 60 woes

Florian Anwander fanwander at mnet-online.de
Wed Jun 10 18:26:05 CEST 2015


Wow, that are a lot of ICs. I had two Junos with dead 4011 on the bench 
(those 4011UB are prone to die), but never with the complete range. And 
what a luck that the 8253 did not go too!

Congratulations!

The VCA thing might be a broken VR5

Florian

On 10.06.15 15:28 , Jack Jackson wrote:
> Success!
>
> So I swapped out:
>
> 4049: IC 52 + IC53
> 4099: IC 50
> 4011: IC 48 + IC49
> 4069: IC57
> 74LS42: IC58
>
> It looks like a transient blew through all these logic chips. The bottleneck that actually stopped the CPU functioning seemed to be the 4049s.
>
> The synth now seems to be completely working except the bias of voice 2 on the VCA out test point is way above everything else.
>
> Thank you all for your help!
> Jack




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