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OTHER DISCUSSIONS => General Synthesis => Other Hardware/Software => Topic started by: yannluaudio on May 22, 2017, 05:49:40 AM

Title: SC PROPHET 600
Post by: yannluaudio on May 22, 2017, 05:49:40 AM

Hi,

I have here an old Prophet 600 to repair.
Everything is OK except than it seems that the 6th voice is not filtered.
Actually when I play key after key also, not only with several notes at the same time.

Is it a known issue ?

Please help.

Thank you !

Yann

Title: Re: SC PROPHET 600
Post by: DavidDever on May 22, 2017, 08:07:37 AM

Quote from: yannluaudio on May 22, 2017, 05:49:40 AM

Hi,

I have here an old Prophet 600 to repair.
Everything is OK except than it seems that the 6th voice is not filtered.
Actually when I play key after key also, not only with several notes at the same time.

Is it a known issue ?

Please help.

Thank you !

Yann

Maybe a bad filter IC? Can you calibrate the voices / filters? (I've got a Gligli in mine, so it's relatively easy to do in my case FWIW)

Title: Re: SC PROPHET 600
Post by: yannluaudio on May 23, 2017, 07:19:39 AM

Quote from: DavidDever on May 22, 2017, 08:07:37 AM

Quote from: yannluaudio on May 22, 2017, 05:49:40 AM

Hi,

I have here an old Prophet 600 to repair.
Everything is OK except than it seems that the 6th voice is not filtered.
Actually when I play key after key also, not only with several notes at the same time.

Is it a known issue ?

Please help.

Thank you !

Yann

Maybe a bad filter IC? Can you calibrate the voices / filters? (I've got a Gligli in mine, so it's relatively easy to do in my case FWIW)

OK thanks I am gonna check the voltage on each PIN 15 of each 3372 IC

Title: Re: SC PROPHET 600
Post by: yannluaudio on May 23, 2017, 08:30:58 AM

This is the CEM3372 of the voice 5 which is suspect.
Where to find this IC ?

Title: Re: SC PROPHET 600
Post by: DavidDever on May 23, 2017, 12:49:50 PM

Quote from: yannluaudio on May 23, 2017, 08:30:58 AM

This is the CEM3372 of the voice 5 which is suspect.
Where to find this IC ?

http://syntaur.com/Items.asp?Item=1832

among other options. Google is your friend!

Title: Re: SC PROPHET 600
Post by: cbx on May 23, 2017, 12:51:52 PM

Have you looked at Wine Country? I think they are still do repairs on old stuff.

http://winecountrysequential.com/

Title: Re: SC PROPHET 600
Post by: yannluaudio on May 23, 2017, 12:55:17 PM

I live in Europe I found this: http://electricdruid.net/product/cem3372-synth-voicing-chip/