Re: [vintagesynthrepair] Need some advice on fixing my OB-X
2013-05-26 by 65 Lotus
Here s something I ran across from Wes Taggart of Analogics. Worth a try... ======================================================= Memory is a significant
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Re: Micromoog LFO
2013-05-25 by scott frye
Hi... To the guy trying to fix this Do you have real world electronics exp? If not, you should seriously look at finding someone professional to deal with the
Re: [vintagesynthrepair] Need some advice on fixing my OB-X
2013-05-25 by Roger J
Re-solder the voice cards mother board, every connection. That will solve 2/3 of the issues. Inspect around bad battery for damage do to any leakage. And as
Need some advice on fixing my OB-X
2013-05-25 by Rod Abernethy
Thanks for letting me join the group, I m a vintage synth fan from way back. My beloved OB-X has started acting up lately and I m going to be doing repairs
Re: Micromoog LFO
2013-05-24 by stompboxaron
Thanks for the help. Replaced the op amp today but still no oscillation. The mod wheel does affect the pitch. Bend and Noise works but the rest just has a
Re: Envelope problem, pops and "sensitive" pots (Crumar Composer)
2013-05-24 by Mikael
The input voltage to the 7912 regulator is -22.2V. I replaced the new regulators with the old ones (made by Texas Instruments), I now have -12.25V as output
Re: [vintagesynthrepair] Roland Juno 106S - note stealing ??
2013-05-23 by NoëlBuhagiar
Thanks Malte.. will check this out in the morning - - - Sounds like the typical chip problem. Run the following test: Power up the Juno while you hold the
Re: [vintagesynthrepair] Roland Juno 106S - note stealing ??
2013-05-23 by Malte Rogacki
Sounds like the typical chip problem. Run the following test: Power up the Juno while you hold the Transpose button down. The press bothe Poly1 and Poly2
Roland Juno 106S - note stealing ??
2013-05-23 by NoëlBuhagiar
Hi, Any been here and can give me a clue before I dive in a Juno 106? Playing a key at a time, after the 5th key played, the 6th does not play. Starting to
Re: [vintagesynthrepair] Micromoog LFO
2013-05-23 by Mike Kearney
Hi again Aron, Here s another possibility, although less likely. You didn t say if the Mod wheel has any effect. The output of the Mod wheel goes through a
Re: Korg Polysix dead voice
2013-05-23 by John Henson
Hi Nicolas, I have found the SSM2044 filter chips to be problematic. I put tiny numbered labels on the chips and then swap them around to confirm the
Re: [vintagesynthrepair] Micromoog LFO
2013-05-23 by Mike Kearney
Hi Aron, Given your symptoms, page 5-8 of the service manual suggests the culprit is IC801, a 1458 dual op amp chip. At least that s how I read it. If your
Korg Polysix dead voice
2013-05-23 by Nicolas
Hi, I m trying to restore a Korg Polysix that has a dead voice. I replaced the memory battery which was in pretty good condition (no leak). Before I check the
Re: [vintagesynthrepair] Envelope problem, pops and "sensitive" pots (Crumar Composer)
2013-05-23 by Hugh Vartanian
On the regulator problem, what is the input voltage to the 7912? More importantly, what are you using for a ground reference? Measure right at the regulator
Micromoog LFO
2013-05-23 by stompboxaron
Got my Micromoog working (it took 3 years!). Now the LFO doesn t work. Bend, Noise works. Everything else Square Wave, Triangle, S&H AUTO etc.... only produce
Re: Envelope problem, pops and "sensitive" pots (Crumar Composer)
2013-05-22 by Mikael
And thank you for the help Lorne, I have taken a lot of photos from different angles so I can see every capacitor.
Re: Envelope problem, pops and "sensitive" pots (Crumar Composer)
2013-05-22 by Mikael
Hi, I started with the power supply but gor problems already there. I replaced the voltage regulators. When I tested the power supply aftwerwards, the -12V
Re: [vintagesynthrepair] Saying my goodbye
2013-05-21 by Daniel Forró
Sorry to hear about such trouble. Thanks and all the best! Daniel Forro
Saying my goodbye
2013-05-21 by Jim H
Hello gang, It is most unfortunate, but my Internet has been mostly out for many months now. Roku works somewhat (died 3 times over the weekend), but I cannot
Re: [vintagesynthrepair] Hohner string melody logan
2013-05-20 by Paul Krull
It could also be that one of the top divide down oscillators is failing. Paul T ________________________________ From: Lorne Hammond
RE: [vintagesynthrepair] Re: Envelope problem, pops and "sensitive" pots (Crumar Composer)
2013-05-20 by Lorne Hammond
Photo the heck out of it before or during disassembly (I know too late) for when you realize one went in backwards because you were tired and you can t find
Re: Envelope problem, pops and "sensitive" pots (Crumar Composer)
2013-05-20 by Mikael
Thanks for the answer. :) I have disassemled the synth completely and I m in the process of mapping out all the capacitors I need. There are about 100
RE: [vintagesynthrepair] Hohner string melody logan
2013-05-19 by Lorne Hammond
Sounds like one of your top octave oscillator boards is out of tune. As they then go to divide down for each octave the lower octaves will be more like a
Re: [vintagesynthrepair] Envelope problem, pops and "sensitive" pots (Crumar Composer)
2013-05-19 by 65 Lotus
I d do a full recap of the electrolytics and see what you get. It may not be the most scientific approach, but...
Envelope problem, pops and "sensitive" pots (Crumar Composer)
2013-05-19 by Mikael
Hi all! I bought a rare Crumar Composer I while ago but it has some problems. This synth has a mono synth section, a poly synth section, a organ section and a
Hohner string melody logan
2013-05-19 by letcista
Hello: I got a Hohner String Melody I that has a problem. When two different keys are pressed theres a kind of beating/detuning effect that in some case seems
SH101 diagnosis
2013-05-18 by Jez
My Roland SH-101 has a problem: Turn on, and the Transpose button lights up, an no sound comes out. The LFO led behaves normally. Plug in CV and Gate via MIDI
Re: Centre Tap Pot..?
2013-05-12 by Quazimodo
Never mind... I modified one myself to suit. Cheers anyway. TOM
Centre Tap Pot..?
2013-05-11 by Quazimodo
Hi, Would anyone know where I could source a 25K ohm *centre tap* potentiometer please..? Cheers, TOM
Re: Boss DR-55
2013-05-07 by alesisfusion8hd
What is exactly broken? If only plastic parts, think 3D printing. I recently fixed a QX1 key (broken axle) this way, with a result over my expectations. My 2c
Re: [vintagesynthrepair] Re: Boss DR-55
2013-05-07 by Nick Bell
Thanks, yeah maybe ill rebuild or try this -
Re: Boss DR-55
2013-05-07 by Boddington
I tried looking for one about a year ago and found none. It is possible to rebuild them if you re up for it.
ELKA SGP150
2013-05-05 by GEOFFREY BARBER
Does anyone have a schematic (circuit) diagram for the above bass pedal, please? Thanks in advance Geoff.
Re: Yamaha SY99 Disk Drive Belt And Battery Holder
2013-04-30 by Paul Krull
Hello Again Folks: I ended up replacing my old belt driven floppy drive with a beltless Sony drive after experiencing some troubles while trying to clean
Re: Ensoniq EPS-16+ Disk Drive Replacement
2013-04-29 by Mikael
Thanks for the help John, it got me in the right direction, there are a few solderable jumpers that goes to pin 2 (which is for disk change in shugart) but
RE: [vintagesynthrepair] Ensoniq EPS-16+ Disk Drive Replacement
2013-04-28 by John Rose
Hi, I have seen this on some old computers where there is a disk loaded or unloaded signal that can be sent back from the drive, some systems ignored it but
Ensoniq EPS-16+ Disk Drive Replacement
2013-04-28 by Mikael
Hi everybody! :) I recently bought an Ensoniq EPS-16+, seems good otherwise but the disk drive is bad, it manages to read a few disks only. The original drive
Moog CP4A question...
2013-04-27 by Quazimodo
Would anyone know where I could get me a copy of the CV summer schematic as mentioned in the Moog Modular service manual (page 8)... and is part of the CP4A
Boss DR-55
2013-04-27 by Nick Bell
I know it s a long shot but does anybody have the start/stop switches for a Boss DR-55 ? cheers
Re: Korg keyboard contact strips....
2013-04-27 by Quazimodo
Thanks Doug, are yours new or used please? Cheers, TOM
start my subscription
2013-04-27 by Donald Young
please start my subscription. your email & the group site have different response requirements to get my account started. I am covering both response
validate account
2013-04-27 by Donald Young
And now.... (re)introducing the sensational Korg Mono/Poly From 1981 !!! Your directions asked for the above quote to be retyped (quote located between the
ARP prosoloist envelope parts or PCB
2013-04-27 by Terje Winther
Hi, I am looking for either the complete ARP prosoloist (or Pro/DGX) envelope PCB, which is the Board B - or the three ARP ROMs on that card, called Z1, Z2
minimoog circuit boards
2013-04-27 by gff_ims
Hi All , through a moving house incident all my minimoog cct boards became landfill. I,ve managed to buy two (vco and contour). Would like to purchase a filter
Re: Korg keyboard contact strips....
2013-04-27 by synthparts
Hi, I have them (6 contacts and 7)... Doug synthparts.com
Korg keyboard contact strips....
2013-04-26 by Quazimodo
Hi guys, I just bought a few Korg Polysix rubber contact strips on eBay - they arrived today but three out of the four I bought are the wrong ones. I bought
Re: [vintagesynthrepair] ARP Prosoloist - some resistor values
2013-04-26 by Terje Winther
Thanks a lot - this was very helpful. Terje ... Terje Winther terje.winther@wintherstormer.no http://wintherstormer.no/ Thanks a lot - this was very helpful.
Re: [vintagesynthrepair] ARP Prosoloist - some resistor values
2013-04-25 by Daniel Forró
Maybe 10-12: 4.108 9.957 15: 6.800 16: 1.844 Daniel Forro
Re: [vintagesynthrepair] ARP Prosoloist - some resistor values
2013-04-25 by Malte Rogacki
I m not sure about 100% of them, but here we go: 1: 30.91k 2: 15.03k 3: 7.047k 4: 3.190k or 3.180k or 3.130k (or possibly even other value) 5: 24.39k 6: 24.39k
ARP Prosoloist - some resistor values
2013-04-25 by Terje Winther
Does anybody have a readable ARP Prosoloist service manual where it is possible to read the resistor values? I need the specific values in the board A