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Prophet 600

For fans of synths, pianos or keyboard instruments of any sort.

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Re: Prophet 600

Postby jjlonbass » Wed Apr 14, 2021 3:14 pm

Excellent news nickle15.

The C2 to G2 keys are driven by output S11 on pin 19 of the 4514. It would be worth checking for continuity from the IC pin to the keyboard busbar connection for those keys.
Do you have an oscilloscope? If you do, you'll be able to observe whether you have activity on pin 19 of the 4514 and whether the logic levels here are correct.

Hopefully you don't have another duff 4514 but at least it will be easy to replace now that you have the IC in a socket.

It feels like you're on the home run now.

John
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Re: Prophet 600

Postby nickle15 » Thu Apr 15, 2021 2:51 pm

Indeed, we located a broken trace to pin 19 and rewired it. The keyboard is finally working perfectly!!!!!!!!!!!!

I can't thank you all enough for the time and effort you put into all the thoughtful recommendations. It was a huge help to us and we are grateful!

I work with the guy that owns the 600 and brought the keyboard to him this morning. Needless to say he's very excited to have it up and running. Thanks again everyone!

Now on to the next thing - I'm looking at you Polysix...
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Re: Prophet 600

Postby blinddrew » Thu Apr 15, 2021 3:15 pm

Good result! :clap:
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Re: Prophet 600

Postby Wonks » Thu Apr 15, 2021 3:17 pm

Yay! :clap:
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Re: Prophet 600

Postby Dave B » Thu Apr 15, 2021 4:13 pm

Great that it's working!

But ... all that pain and heartache and it's not even yours???? ;)

I hope the owner appreciates this. Pizza and beer is the very least he should be offering you!

:D
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Re: Prophet 600

Postby nickle15 » Thu Apr 15, 2021 4:37 pm

Dave B wrote:Great that it's working!

But ... all that pain and heartache and it's not even yours???? ;)

I hope the owner appreciates this. Pizza and beer is the very least he should be offering you!

:D

He was very appreciative. I advised him of the cost of the parts which is all we were asking for and he said there would be more than that coming.

I learned a lot through the process and will pass along any excess to my dad who did the hard work.

My friend is in a nice spot though. Between the original tech bill and the parts we replaced he's out $200. The keyboard was given to him at no cost so if he wanted to sell at this point there's a lot of money to be made!
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Re: Prophet 600

Postby Folderol » Thu Apr 15, 2021 6:18 pm

very pleased to hear this is up and running :thumbup:
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Re: Prophet 600

Postby nickle15 » Thu Apr 15, 2021 6:23 pm

Folderol wrote:very pleased to hear this is up and running :thumbup:

Thank you - and thanks again for all the help!
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Re: Prophet 600

Postby Martin Walker » Thu Apr 15, 2021 10:12 pm

Bravo - what a team effort!


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