Re: Crumart Trilogy replacement power transformer
2011-05-31 by bluejinn
Check the rectifiers and cap s downrange for shorts. I had a similar fault on a power rail on an Otari tape deck. Kept blowing fuse, I replaced both the
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Re: Crumart Trilogy replacement power transformer
2011-05-31 by Boddington
The psu board could be faulty but I haven t even got that far. Right now just having the transformer connected to the and power switch (with the rest of the
Re: Crumart Trilogy replacement power transformer
2011-05-31 by bluejinn
What kind of troubleshooting have you done so far on the PSU? Are you sure no voltage is coming form the transformer? The PSU isn t very complex. A dead short
Re: Crumart Trilogy replacement power transformer
2011-05-31 by duncan
... the schematic I found by googling dates from 1981, & shows that the synth uses +/- 15V & +/- 12V as well as a couple of other lower voltages, all regulated
Crumart Trilogy replacement power transformer
2011-05-31 by Boddington
Hi folks! Does anyone have info on what sort of replacement transformer I should be looking for? I ve got one that s blown here, North American model. It s a
RE: [vintagesynthrepair] Is there a forum with messages for this group?
2011-05-30 by timothy kosiorek
Hello:your low volume is probably in the preamp or the amp you are connecting it to,the start motor has a clutch on it that pushes the start gear into the main
Is there a forum with messages for this group?
2011-05-29 by Eddie Dickerson
HI, Sometime ago I got a reply on my Hamond B3 through this group. I looked at my groups in yahoo and see I am not a member. I see it is an egroup so is
Re: ARP Quadra computer issue
2011-05-20 by bluejinn
I replaced the 5101 with a NOS chip. No clock designation on either the old or the new, but it works. As for the battery, I like the idea of switching to a
Re: [vintagesynthrepair] Re: ARP Quadra computer issue
2011-05-19 by Philip
5101 is a common failure in anything that uses them, so yes I d look at swapping it out..try to match the speed of the original..some circuits are sensitive to
Re: ARP Quadra computer issue
2011-05-19 by bluejinn
Thanks, I replaced the batteries a few days ago, and there was some corrosion around the negative terminal, but I checked the voltages on the outside of the
Re: ARP Quadra computer issue
2011-05-19 by Alexis V. Rogers
Sounds like a battery problem to me. Get the old one out and look for signs of leakage and acid-corroded traces. You can replace the old batteries with a 3V
ARP Quadra computer issue
2011-05-19 by bluejinn
Hello Here is the deal, the 16 programmable switches don t program. The actual function switches still work, and the program change switches appear to change
Re: yamaha IC datasheets
2011-05-18 by synthparts
Also available directly here - http://manuals.fdiskc.com/tree/Yamaha/Yamaha%20IC%20Guide%20Book.pdf Doug synthparts.com
Re: Just added a link for vintage Yamaha ICs
2011-05-12 by cpt.zilog
Thanks for the pdf. Will be usefull for sure.
RE: [vintagesynthrepair] Re: Sequential Circuits Pro One schematic help
2011-05-12 by Brian
I would certainly not rub IC legs with any abrasive let alone something like wet and dry emery cloth. The legs are probably plated could be gold flash or one
Re: Sequential Circuits Pro One schematic help
2011-05-11 by Scott
... On socketed ICs it s good to CAREFULLY pull them and buff the pins with a autobody type sandpaper ( like 600 grit or finer) Lay the sandpaper flat on a
yamaha IC datasheets
2011-05-11 by Scott
http://www.4shared.com/get/F0kPleY7/YAMAHA_IC_GUIDE_BOOK.html
Re: Just added a link for vintage Yamaha ICs
2011-05-10 by duncan
... links section. over there
RE: [vintagesynthrepair] Just added a link for vintage Yamaha ICs
2011-05-10 by francois
Cool, thanks! Could you send the link? To: vintagesynthrepair@yahoogroups.com From: painintheamp@gmail.com Date: Mon, 9 May 2011 13:38:03 +0000 Subject:
Re: [vintagesynthrepair] Sequential Circuits Pro One schematic help
2011-05-10 by Tom Russell
The fact that you get intermittent signal when you press on pins sounds like a bad mechanical connection somewhere, either in socketed chips, bad wire
Re: Sequential Circuits Pro One schematic help
2011-05-10 by Scott
... Is R1156 actually connected? Looks like a feedback device. Is that coupling cap 2.2uf still good? Also check for power supply ripple at the Vcc / Vdd pins
Kurzweil 1000PX power supply problem
2011-05-10 by hochtigal
Dear group members, I recently bought an 1000PX which doesn t turn on. It has an extra cable coming out from the back which, when I took a look inside, it is
Re: [vintagesynthrepair] MIDI Modules For Sale
2011-05-09 by Samuel Adams
Sorry, I don t have these. Greg ... From: Keith Niver To: vintagesynthrepair@yahoogroups.com Sent: Monday, May 09, 2011 9:00 AM Subject: RE:
Re: [vintagesynthrepair] Sequential Circuits Pro One schematic help
2011-05-09 by Tom Russell
Mark- yes Pin 10 is the output (well, the final stage of 4) Here s a block diagram of the P-One filter:
Sequential Circuits Pro One schematic help
2011-05-09 by Mark
I recently posted about my nonfunctional Pro One. I m getting nothing out of the output, except for some noise. Anyway, the transformer is ok, and the PSU caps
Just added a link for vintage Yamaha ICs
2011-05-09 by Scott
It s 164 pages of PDF with some GREAT info on which ICs are used in which synthes and complete data. I just found out I have a mess of cool ICs that came from
RE: [vintagesynthrepair] MIDI Modules For Sale
2011-05-09 by Keith Niver
I don t see it listed, by I have a friend looking for a Kurzweil MIDI piano, or a Kawai module. Keith A Niver ... From: vintagesynthrepair@yahoogroups.com
MIDI Modules For Sale
2011-05-07 by Samuel Adams
Hi, I hope this message is appropriate for this list and apologies in advance if it s not... I have some rack-sized MIDI modules up for sale to help raise
Re: Sequential Circuits Pro-One not working... Please help!
2011-05-07 by Mark
I tested the transformer last night. I m getting 2x 15 volts, which is good, and the transformer is working great, no shorts or fused cores. Oh, how I wish it
Re: Sequential Circuits Pro-One not working... Please help!
2011-05-06 by duncan
mark, if you need the schemos, they re in the files section of the sequential circuits group. duncan.
Re: Sequential Circuits Pro-One not working... Please help!
2011-05-05 by Mark
Oh for sure! I wasn t intending on it, as I know how rare the 3280s are, or any of the CEMs for that matter.
Re: Sequential Circuits Pro-One not working... Please help!
2011-05-05 by Tom Russell
I wouldn t go swapping in good ICs until the PS is confirmed as working correctly. Especially a rare device like a 3280.
Re: Sequential Circuits Pro-One not working... Please help!
2011-05-05 by Mark
I haven t done that much debugging yet, but when I get to it tonight I will measure the voltages. I hope I can find my digital voltmeter! I got in touch with
Re: [vintagesynthrepair] Sequential Circuits Pro-One not working... Please help!
2011-05-05 by GB
How are the power supplies? GB ... From: Mark To: vintagesynthrepair@yahoogroups.com Sent: Wednesday, May 04, 2011 10:35 PM Subject: [vintagesynthrepair]
Sequential Circuits Pro-One not working... Please help!
2011-05-05 by Mark
I recently bought a non working Pro-One locally, and I decided to open it up and try my hand at repair. I ve repaired quite a few synths, but this one has
Moog wiring harness-lacing
2011-04-27 by Bernie
A great source for wiring harness lacing is your local telephone company. They buy it by the case, if not the pallet. Tell them what you re using it for and
P10 odd problem
2011-04-27 by Frank Simon
Guys, It s late and I ll try to be coherent discussing my findings working on this P10. So not to type I copied an analysis from a gentleman named John Gee
Re: Help needed sourcing parts for a Moog Source (haha)
2011-04-27 by duncan
mark, the transformer s nothing special. so long as it fits in the case & has the right choice of windings for your locality, any 15-0-15 rated at 60VA should
Help needed sourcing parts for a Moog Source (haha)
2011-04-25 by Mark
Hi, I m currently overhauling a Moog Source. I ve done quite a decent job because I have a good Moog Source to look at for reference points, but I m at a brick
Re: [vintagesynthrepair] prophet 5 rev 2 service manual
2011-04-22 by Noel Buhagiar
prophet-5 - Revs 3.0, 3.1, 3.2 /technical manual: http://www.hylander.com/images/schematics/sequential/Profit5v3TechManual.pdf Noel Buhagiar MALTA ... I m
Re: [vintagesynthrepair] prophet 5 rev 2 service manual
2011-04-21 by Frank Simon
Go to this forum and one of the posts has a down load. I saw it in there. http://prophet5.org/viewforum.php?f=2&sid=54c03fe92bd7174eee66bc6c4bb21600 ... From:
prophet 5 rev 2 service manual
2011-04-21 by thesnomans
I m searching for a download of a prophet 5 rev 2 service manual. anybody have one? there was one posted on this site... but the link no longer works.
Re: memorymoog
2011-04-20 by gerryrdahl
Hi JP, The stockk MM sends MIDI on OMNI. You need to use a MIDI filter between the MM and the AX7 or upgrade the MM. There is of course the LAMM, but there is
RE: [vintagesynthrepair] Sticky keys solved!
2011-04-16 by timothy kosiorek
its always great l to learn of a new method of repair that works,Ive got 40 years experience but keep learning every day. Tim K. direct link to my webstore
Sticky keys solved!
2011-04-16 by synthflake
I posted a few week ago about my EX7 with the two top octaves sluggish from someone spilling soda on the synth. I purchased it that way a few years back, and
Looking for CEM3340 chips...
2011-04-09 by Gil
Hello synth people ! I m looking for CEM3340. Basically I need four of them. I can pay or trade for misc parts of Matrix 6, Polysix, Korg M1, Juno 106...
Re: Tone Module sale
2011-04-08 by nervejam
Welcome to the wonderful world of eBay. :( I used to run an eBay shop, back when it didn t cost much to do so, and there were Store inventory listings
Re: [vintagesynthrepair] Tone Module sale
2011-04-08 by Paul Rak
Welcome to the wonderful world of eBay. :( I used to run an eBay shop, back when it didn t cost much to do so, and there were Store inventory listings
Tone Module sale
2011-04-07 by Alan
Hello, I have a member here for about a year or so and occasionally answer questions. I have been playing with tone modules since 1987. For the past few
Re: [vintagesynthrepair] Kurzweil K250 power supply needed
2011-04-07 by Daniel Forró
There s a yahoo group for K250 with lot of nice people, try to ask there. I m just working on repair of my power pad... Daniel Forro