Vintage Synth Repair

Steve,
Thanks, obviously I have a Rev 1. My schematic is a scanned copy and 
didn't see the note and still don't but I know you are correct. What 
do you think I could have damaged with the 12v I put in? Like I said 
U931 shorted and got hot. I know that may be a tough question 
without personally probing but the board is holding the 5v now. How 
could I verify functionality of PCB9. 

Also if I put one of the voice boards in with 4 CEM3310 missing can 
I continue troubleshooting? Is there a chance I could get confidence 
from a oscope or panel lights before I buy four CEMs.

--- In vintagesynthrepair@yahoogroups.com, "thirteentech" 
<thirteentech@...> wrote:
>
> The Prophet 10 service manual shows that U603 is a +5V for rev. 1 
machines, or +12V for Rev. 0 machines. It looks like that supply is 
for either a 5V 
> cassette drive or a 12V wafer drive depending on which version of 
machine you have, but the schematic also shows a note on the 5.6V 
rail of the PSU 
> saying: "To PCB 9, Rev 0, not used for Rev 1". So depending on 
whether you have a Rev 0 or Rev 1, there will be different supplies 
on P603 pins 2 and 
> 3.
> 
> 
> --- In vintagesynthrepair@yahoogroups.com, "Frank Simon" 
<fsimon001@> wrote:
> >
> > Hi Steve,
> > I have a manual I downloaded from paintingwithsound.com. It is 
hard to read. I was a little disappointed when the power supply in 
my schematic 
> states VR603 was 12v T0-3 down to the wire color. Later to find 
out as I traced it to the PCB9 Polyphonic sequencer CPU board it 
needed to be a 5V. 
> It took out a Dual Flip Flop U931. After that I put a proper 5V in 
and nothing is shorted. But doesn't mean something else was't 
damaged on that 
> board just not shorted. That same part was originally bad when the 
original 5V Reg was in then the 12V took it out again. That was the 
first 
> bonehead move. And as you may read from my first mail the CEM3310 
story. So my progress is negative. If you can offer a systematic 
approach to 
> trouble shoot this maybe by isolating boards or whatever I would 
appreciate it. If you have a readable schematic you can share it 
would be great. 
> >   ----- Original Message ----- 
> >   From: Stephen Jones 
> >   To: vintagesynthrepair@yahoogroups.com 
> >   Sent: Tuesday, April 15, 2008 9:35 PM
> >   Subject: Re: [vintagesynthrepair] Hi from a new member.
> > 
> > 
> >   Wow, that's a lot of questions. I can help out, but
> >   not all at once, I have a workshop full of synths at
> >   the moment that I am fixing 1 by 1. Starting the the
> >   Prophet 10, do you have a service manual for it?
> > 
> >   --- Frank Simon <fsimon001@> wrote:
> > 
> >   > Hi Steve,
> >   > I hope everyone doesn't attack you at once. I had a
> >   > crazy experience where I bought a Prophet 10, Korg
> >   > Trident Mk II, and Roland JX 10 all for $30 each non
> >   > working. I am an RF engineer and novice
> >   > musician/Audio repairman. I know linear more than
> >   > digital but I am going to throw out some questions
> >   > since you offered. 
> >   > 1)My Trident I fixed due to NiCad battery meltdown
> >   > destroying traces but I repaired the PC board(with
> >   > wire) and all works great Strings, Brass,
> >   > FLANGER!!!, but the Synth section makes occasional
> >   > odd noises sounds like processing. Any trouble
> >   > shooting advice would be appreciated.
> >   > 2) The P10 had no sound, lit up, I found a 5V
> >   > regulator pulled down. Found the bad IC(burned my
> >   > finger). Then like a dumb a## I was checking -5V reg
> >   > T0-220 on a voice board,slipped shorted output to
> >   > input and took out 4 CEM3310. OUCH!! Still don't
> >   > know why due to internal Zener in CEM3310. I want to
> >   > continue toubleshooting but don't want to buy pricey
> >   > chips until my confidence is up. Can I put the board
> >   > in without 4 of the 10 CEM3310 and continue. I'm
> >   > sure no sound but -5v reg will be up. Any advice
> >   > appreciated.
> >   > 3) Roland JX10 is total dead. I think power supply
> >   > was good. Lower priority. This one I don't have a
> >   > schematic. Do you have one?
> >   > 4) Finally my Hammond H-112 had low volume and I
> >   > found unplugging the Reverb tank it came back full
> >   > volume. I think the reverb is ok. Do you think it
> >   > could be a tube driver? Sounds odd that it would
> >   > shut the amps down.
> >   > 
> >   > Sorry for the overload. I'm excited about these
> >   > synths. If I fix one I got more than my money back.
> >   > The Korg is very close. I will cry if I can't fix
> >   > the P10.
> >   > Thanks,
> >   > Frank
> >   > 
> >   > 
> >   > ----- Original Message ----- 
> >   > From: thirteentech 
> >   > To: vintagesynthrepair@yahoogroups.com 
> >   > Sent: Tuesday, April 15, 2008 7:54 AM
> >   > Subject: [vintagesynthrepair] Hi from a new
> >   > member.
> >   > 
> >   > 
> >   > Just wanted to introduce myself... I am a
> >   > synthesizer service tech from Sydney, Australia. I 
> >   > have been fixing synths since 1982, as well as a
> >   > lot of touring as a keyboard tech. Currently I 
> >   > have around 22 vintage machines that I play and
> >   > use for recording, and have been a warranty 
> >   > tech in Australia over the years for PPG, Kurzweil
> >   > E-mu and Sequential. Hope I can help out a 
> >   > little on the forum, and learn some new things too
> >   > :-)
> >   > 
> >   > Steve Jones.
> >   > 
> >   > 
> >   > 
> >   > 
> > 
> >   __________________________________________________________
> >   Be a better friend, newshound, and 
> >   know-it-all with Yahoo! Mobile. Try it now. 
http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ
> >
>