Re: [vintagesynthrepair] arp omni
2008-05-08 by Philip
Great thanks a lot..I will do.. Phil. ... __________________________________________________________ Sent from Yahoo! Mail. A Smarter Email
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Re: [vintagesynthrepair] arp omni
2008-05-08 by Roy J. Tellason
... I *strongly* disagree with a few statements that he makes there, one of them being how tantalum capacitors degrade with age -- that s not the problem in
Re: [vintagesynthrepair] arp omni
2008-05-08 by Peter Brown
hi Philip, i have Omni schematics & other info that might be useful for you on the ARP Omni Resource Page http://peterunderdog.com/arp/ i did a lot of work
Re: [vintagesynthrepair] arp omni
2008-05-08 by Malte Rogacki
... http://peterunderdog.com/arp/repair.html is another starting point. The beauty of the Omni is that large parts of it can be debugged one after another.
Re: [vintagesynthrepair] test points on arp odyssey mk1
2008-05-08 by Malte Rogacki
... The calibration is described pretty well in the service manual and most of it doesn t require to know the test points. The calibration notes usually give
Re: [vintagesynthrepair] arp omni
2008-05-08 by Philip
Cool...thanks for that...yeh I seem to remember something about the tants being a problem in that model. Well I managed to fix a dead Quadra so I feel I could
Re: [vintagesynthrepair] arp omni
2008-05-08 by Malte Rogacki
... There has been some discussion about this in the past few days. Some components inside the Omni are prone to failure. Here is a good description of the two
Re: [vintagesynthrepair] arp omni
2008-05-08 by Philip
On the subject of arp stuff..Ive been thinking of getting an Arp Omni but how come nearly every single one I see is broken, not working, in need of repair etc?
test points on arp odyssey mk1
2008-05-08 by Johnny
does anyone know how to find the test points on the arp odyssey mk1? i m hoping to do the calibration. also, i m still not really good at reading circuit
Re: [vintagesynthrepair] Prophet 10 factory patches
2008-05-07 by Miguel Mendoza
Thanks a lot for your answer but this is the only thing I found regarding this, it s not very clear for me and it doesn t explain the mechanical procedure:
Re: [vintagesynthrepair] Prophet 10 factory patches
2008-05-07 by Stephen Jones
There are plenty of Prophet 5 owners manuals floating around on the web, if you download one it will have the correct procedure. If you are using tape, don t
Prophet 10 factory patches
2008-05-07 by Miguel Mendoza
Hello group, I would like to transmit the factory presets to my Prophet 10. Although I downloaded the files from the net I can t find any information about
Arp Quadra
2008-05-05 by gerryrdahl
Hello, I m new here, but not new to repairs. I do a lot of Moog repairs and am always picking up new tips and tricks (Always learning!). I have an Arp Quadra
Re: [vintagesynthrepair] Re:arp odyssey mk1 sample and hold problem
2008-05-05 by Roy J. Tellason
... I could be mistaken about that -- my recollection is a bit fuzzy, and I don t have my printed schematics at hand, the electronic versions I was looking
Re: [vintagesynthrepair] Re:arp odyssey mk1 sample and hold problem
2008-05-05 by Malte Rogacki
... Hmmmm. I m not quite sure that this is 100% how it works. The +15V are the Sustain Reference ; this is not what is going directly to the sustain buss.
Re: [vintagesynthrepair] Re:arp odyssey mk1 sample and hold problem
2008-05-04 by Roy J. Tellason
... It took a little digging since I don t seem to have my ARP stuff handy here, but I found my electronic copies of the schematic (which are nowhere near as
Re: [vintagesynthrepair] Re:arp odyssey mk1 sample and hold problem
2008-05-04 by Malte Rogacki
... There certainly are enough failures, especially given the number of tantalum caps in the Omni (all in all there must be around 80 or more caps; I didn t
Re: [vintagesynthrepair] Re:arp odyssey mk1 sample and hold problem
2008-05-04 by Roy J. Tellason
... I m amazed that there weren t more failures in the Omni, what with them using a 25V cap in a circuit that could potentially see 30V across it. :-) ... --
Re: [vintagesynthrepair] Re:arp odyssey mk1 sample and hold problem
2008-05-04 by Philip
ah yes tantlum caps...I repair a lot of archaic 70 s arcade machines like space invaders etc...they have a very high failure rate in my experience.. I agree
[vintagesynthrepair] Re:arp odyssey mk1 sample and hold problem
2008-05-04 by Malte Rogacki
The number of dead op amps I ve seen in ARP synths is pretty high. Especially that LM301 (or the variant ARP used) seems to fail regularly. Coincidentally I
Re: [vintagesynthrepair] Re:arp odyssey mk1 sample and hold problem
2008-05-04 by Roy J. Tellason
... I didn t miss that.... ... Damn straight! :-) -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this
RE: [vintagesynthrepair] Re:arp odyssey mk1 sample and hold problem
2008-05-04 by timothy kosiorek
I agree with the Techs,I ve seen many opamps go bad over the years,but I remember changing Opamps back when these vintage synths were still relatively new.I
RE: [vintagesynthrepair] Re:arp odyssey mk1 sample and hold problem
2008-05-04 by Keith Niver
I agree with Roy. In my 40 years of working on music organs, synths, amps, etc. I find it very common for op amps to fail. I do always check the coupling caps
Re: [vintagesynthrepair] Re:arp odyssey mk1 sample and hold problem
2008-05-04 by Roy J. Tellason
... Well, I ve been a tech for around 40 years, and I have. Lots of 1458 and 4558 op amps go bad, typically with the output sitting at the negative supply
Re:arp odyssey mk1 sample and hold problem
2008-05-04 by thirteentech
I agree, with vintage synths dead op-amps are common, and so are dead OTA s and transistor arrays. 1458 s, 4558 s, 741 s, CA3080 s, CA3280 s and LM 3046 s
Re: [vintagesynthrepair] Re:arp odyssey mk1 sample and hold problem
2008-05-03 by Philip
Ive seen exactly the opposite in vintage synthesizers. Op-amp failures are common in my world. :) ... In my 25+ years on working in engineering and test I ve
Re:arp odyssey mk1 sample and hold problem
2008-05-03 by scott frye
In my 25+ years on working in engineering and test I ve seen VERY VERY few op amps ever go bad. Caps crap out far more and power resistors and 3 terminal
Re: [vintagesynthrepair] arp odyssey mk1 sample and hold problem
2008-05-03 by Malte Rogacki
There are various things to check. First of all, does any signal get to the S/H circuit at all - and does it get through. Check pin 3 of A2 (that s the input)
Re: [vintagesynthrepair] arp odyssey mk1 sample and hold problem
2008-05-03 by Terje Winther
Follow the S&H signal. Even though it usually are opamps and transistors that fails, it couls also be the simplest things. I once tracked the problem of an ARP
arp odyssey mk1 sample and hold problem
2008-05-02 by cockandswan
hey guys, i ve fixed both the modulation inputs for the filter and my noise generator on my arp odyssey mk1 by replacing op amps. it s sample and hold mixer
Northeast US repair
2008-05-02 by Scott
Service available for keyboards and synths here in southern VT. I have 25+ years in electronics troubleshooting and repair and I m also a user ( ESQ-1 ,
Re: Prophet 10 repair (was Hi from a new member).
2008-05-01 by thirteentech
If you are going to own and maintain a Prophet 10 then is is definately worth having the correct drawings for it, so it would be a good idea to get them I
Re: [vintagesynthrepair] Re: Prophet 10 repair
2008-05-01 by Philip
Your manual question has been discussed on another synth mailing list. You need the exact version schematics for your synth, the more info the better. ...
Re: [vintagesynthrepair] Re: Prophet 10 repair
2008-05-01 by Philip
Frank, Not at all, no personal jabs at you intended I promise. I m very sorry you feel that way. But when you start asking what an EPROM is/does, and it takes
Re: [vintagesynthrepair] Re: Prophet 10 repair (was Hi from a new member).
2008-05-01 by Frank Simon
Steve, I got this from someone on the Web. Do you feel I need what he is selling? This is his pitch: [From what I ve been told now, it seems you need the Rev.
Re: Prophet 10 repair (was Hi from a new member).
2008-05-01 by thirteentech
It sounds like you know what you re doing, the only way to test the EPROM s (apart from hung data or address lines) is to replace them. Have a look on some of
Re: [vintagesynthrepair] Re: Prophet 10 repair (was Hi from a new member).
2008-05-01 by Frank Simon
Steve, Since I downloaded the P5 service manual (it only goes to rev 3.2) I have a much better understanding of the system. It helps to have a good service
Re: [vintagesynthrepair] Re: Prophet 10 repair
2008-05-01 by Frank Simon
Philip, You are right. You have been taking jabs at me for some reason for some time now. I am an RF Engineer for 15 years and prior to that an RF Technician
Re: [vintagesynthrepair] Re: Prophet 10 repair
2008-04-30 by Philip
Not being funny but I think we said this like 3 weeks ago....I repeated it too a few days ago. He has a problem in the digital domain that s plain to
Re: Prophet 10 repair (was Hi from a new member).
2008-04-30 by thirteentech
Yes, it sounds like your computer is not running, and you are getting random LED s when you power up. Do you have an oscilloscope and any experience
Re: Prophet 10 repair (was Hi from a new member).
2008-04-30 by fsimon100
Steve, I down loaded a P5 service manual. It is very helpful and much better print than the P10 schematic I have. I can now see the what you meant by the
Re: Prophet 10 repair (was Hi from a new member).
2008-04-30 by fsimon100
Steve, I down loaded a P5 service manual. It is very helpful and much better print than the P10 schematic I have. I can now see the what you meant by the
Kawai SX-210 service docs?
2008-04-30 by jfloydhumanoid
I bought it new in 84, gigged with it a few years, got married, & just dug it out of storage a few months ago. Of course the patch memory was gone, but
Re: [vintagesynthrepair] Korg Mono/Poly MP-4 Tuning Issues
2008-04-29 by Frank Simon
I just repaired a Korg Trident and it is doing something similar in Synth mode when repeating playing even a single note continuously. However mine will in
Re: Prophet 10 repair (was Hi from a new member).
2008-04-29 by thirteentech
Well, I can t guarantee that the machine will run OK without the sequencer, but it probably will, and is worth a try. I see one P10 for every dozen P5 s that I
[vintagesynthrepair] Korg Mono/Poly MP-4 Tuning Issues
2008-04-29 by Brinkmann Music
I have a Korg Mono/Poly MP-4. I was able to tune each Osc on Circuit board KLM-398. However, as you ascend the keyboard up from the lowest note to highest
RE: [vintagesynthrepair] SIEL DK600
2008-04-29 by Scott Nordlund
Has the NiCd battery on the CPU board leaked? To: vintagesynthrepair@yahoogroups.com From: painintheamp@yahoo.com Date: Tue, 29 Apr 2008 11:50:29 +0000
Re: Prophet 10 repair (was Hi from a new member).
2008-04-29 by fsimon100
Steve, Thanks. Are these diagnostics tribal knowledge or are they documented in a manual. I do not hve the P10 manual. If I find one will it give me diags. I
SIEL DK600
2008-04-29 by Scott
I have one here in my shop. Found a bad TL084 on the main PCB and updated some power supply caps. It powers up but after i hit a couple function switches the
Re: [vintagesynthrepair] Re: Prophet 10 repair
2008-04-29 by Roy J. Tellason
... There s a fairly good set of books covering the basics here: http://www.allaboutcircuits.com/l_sitemap.html If you hit the pdf link on the top right