Vintage Synth Repair

No problem...

Yes it's pulsing digital signals, and to check them 
you need a logic probe or a scope. 

Then you can probe around the CPU to if you have the
correct activity. A 4050 is a buffer chip..generally
you should see the same signal on the input of the IC
as on the relevant output.

Check that the cpu is not stuck in reset..the reset
pin on the cpu should be high IE +5

Phil.




> 
> One thing noted: nearly all the pins going from the
> cpu to the 4050 
> chip read 5v dc. Is it "digital information"? I get
> the same reading on 
> all the 4050 outputs, going into ic 9a. 4050
> datasheet seems to mention 
> this chip should output only 0,5v (but I could be
> wrong)...
> 
> Is this a sign of a fried chip? I have no other
> clue.
> 
> Many thanks.
> 
> 



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