Check the none of the transistor have leaky junctions, but failing that swap
IC35!
On 07/02/2010 21:02, "Alexis V. Rogers" <alexis.v.rogers@gmail.com> wrote:
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> The LED does light on that voice. I checked voltages on IC35 and Q5 as you
> suggested and found two discrepencies with the other working voices. I'm
> measuring -1.495V on pin 1 of IC35 on the problematic voice, where I get
> -0.02ish on pin 1 on the working voices. Also, I'm getting -1.2V on the base
> of Q5 where I'm getting around -0.02V on the bases of Q5 on every other voice.
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> --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com> , Andrew
> Jury <andy@...> wrote:
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>> > Hi,
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>> > When you switch to EG mode does this non-sounding voice still light the
>> LED?
>> > As a generic answer, you might want to perform some comparative
>> measurements
>> > around bi-lateral switch IC35 and around emitter follower stage Q5 with the
>> > other working voices. My guess is that there is a problem somewhere in this
>> > vicinity.
>> >
>> > Good luck and don¹t forget to tell us how you get on.
>> >
>> > Cheers,
>> > Andy
>> >
>> >
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