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: thirteentechSent: Tuesday, April 15, 2008 7:54 AMSubject: [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.