[sdiy] Yamaha CS-30 IG00151 Woes

Doug Terrebonne dougt55 at yahoo.com
Thu Aug 6 05:41:14 CEST 2020

 I have a few 151s and a couple 152s in stock.

    On Wednesday, August 5, 2020, 7:59:51 PM PDT, James R. Coplin <james at ticalun.net> wrote:  
 I think I may have a self inflicted wound with my CS-30. It had an 
ailing filter for ages which was intermittent but I finally decided to 
fix it. Turned out to be the IG00152 which I replaced. In the process of 
closing everything back up, I either missed hooking up one of the wire 
harnesses to the card or it came loose. I don't know if it is related, 
but when I powered it back up, there was no sound.

I've opened it back up, reattached the cable, but still no sound. I 
started tracing control and audio signals in the VCA and I have source 
and control right up to the 4 IG00151. Two are for the envelopes and 
mods for the 2 filters and the other 2 are for the audio signals. The 
power inputs to the chips are good. Is there anything else to consider 
or should I assume all 4x of the ICs are bad. Ick. Anyone know of a 
reliable source if they are?

James R Coplin
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