Re: [vintagesynthrepair] Prophet 5 flickering issue!!
2014-01-03 by Terje Winther
Hi, I have seen lots of this. Usually it is: a. Some front panel pots sending out noise, which the computer interprets as lots of data and the scanning cycle
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Korg Micropreset M500 in trouble!
2014-01-03 by Jim Blair
Hey folks, I have a nice little Micropreset that is getting fussy. Here are the general symptoms: On certain patches , everything is fine. On others, some
RE: Prophet 5 flickering issue!!
2014-01-03 by <salsole@...>
Maybe u203? It is a 4051... MUX for the adsr s... possibly could be bad? The sustain and release pots are new, and changing them had no effect.
Prophet 5 flickering issue!!
2014-01-03 by <salsole@...>
Hi all. I just bought a prophet 5 rev 3.2 for a good price, and it needed a bit of care. 5 broken knobs, a bit of power supply stuff that needed working
Re: [vintagesynthrepair] Roland VR-760
2013-12-29 by Roger J
Are you saying it plays and has a bad display or or slow power up with a bad display and does not play? If it plays, then it is only a display issue and that
Re: [vintagesynthrepair] Roland VR-760
2013-12-29 by Kevin Doheny
Hi Tom, It s worth bothering with if the keyboard is important to you. Certainly a lot more to check before declaring it a boat anchor. I m not recalling
Re: [vintagesynthrepair] Re: Jupiter 6 PSU.
2013-12-29 by 65 Lotus
The ripple is just the AC measurement on the line. The power supply rectifies the incoming AC to DC of course then drops the voltage. You look at the power on
RE: Jupiter 6 PSU.
2013-12-28 by <warlandr63@...>
The PSU on the JP6 is a discreet linear design with no 3 terminal regulators used. IC1 (UPC3423C) is an overvoltage detection IC that is connected to SCR1.
Roland VR-760
2013-12-27 by <noddyspuncture@...>
Hi guys, Hope you all had a great Xmas... and here s wishing you all a Happy New Year! Also, I have a Roland VR-760 here. Very slow to boot up - gets there
RE: Reintroducing myself/ Sound Doctorin'
2013-12-27 by <manggold@...>
I avoid both Paypal and eBay like the plague for the same reason you ve experienced. In my case the means through with Paypal allowed me to be scammed was a
Re: [vintagesynthrepair] Re: Jupiter 6 PSU.
2013-12-26 by plat@simnet.is
Hi Scott. Yes, it seems more discreet. There are no large 3 terminal regulators, however there is a D1406 Transistor , a thyristor 5P05M and 2 ic s ( IC1:Nec
RE: Finally digging back into the Siel DK600 pile..
2013-12-25 by <sounddoctorin@...>
Well I knocked out two and I ve begun to just write a troubleshooting guide for these things since I get sick of forgetting which pins to test etc. every time.
Re: Jupiter 6 PSU.
2013-12-24 by Scott Frye
Yes, I would say it s the PSU. I dont have a diagram for it here but , in a rig with THAT much digital, the +5volts is either a LARGE three terminal regulator
Re: [vintagesynthrepair] Reintroducing myself/ Sound Doctorin'
2013-12-23 by <sounddoctorin@...>
Noel, unfortunately most of them just jack up the shipping price and people pay for it over the years a large amount of money. STILL though if they want they
RE: Re: [vintagesynthrepair] RE: Reintroducing myself/ Sound Doctorin'
2013-12-23 by <sounddoctorin@...>
I can t figure where the context of this went? sounddoctorin.com/synthtec/deadbeat.htm has the whole story pretty much anyway. I see Jack Valentijn posts a
Re: Jupiter 6 PSU.
2013-12-23 by Scott Frye
ALSO, On a rig with this many years on it , standard tech service would most likely replace the main electrolytic caps in that supply. Dried out and weak caps
Re: [vintagesynthrepair] Re: ETI/Maplin 4600 group
2013-12-23 by brian walker
Hi No it is not easy to find Please try again Brian On Sunday, 22 December 2013, 23:23, Paul wrote: Hi Gang, Sorry for the
Re: [vintagesynthrepair] ARP Solus OSC1 tracking issue. ..
2013-12-23 by Jason Solé
It was the 1458 that VCO1 and VCO2 share. Half of it was bad... thanks for the help fellas!!
Re: [vintagesynthrepair] Re: Jupiter 6 PSU.
2013-12-23 by plat@simnet.is
°Hi. I did that and all the boards kill the 5v. Thats why I am assuming it has got something to do with the PSU? Thanks Arnar ... Frá: Scott Frye
Re: Jupiter 6 PSU.
2013-12-22 by Scott Frye
Find out how many board assbys the +5 volts goes to ( PROBABLY all digital) Disconnect each board assby , one at a time and see which one kills the +5 volts
Re: ETI/Maplin 4600 group
2013-12-22 by Paul
Hi Gang, Sorry for the delay, I had a computer crash, literally, chasing a hamster ! Sorry forgot the link , I thought it was easy to find....
Re: [vintagesynthrepair] Jupiter 6 PSU.
2013-12-21 by 65 Lotus
Sounds like a bad 5V regulator or perhaps a cold joint on one of the pins? Does the DC look ok on an o-scope when unloaded? ... From: plat@simnet.is To:
Re: [vintagesynthrepair] ARP Solus OSC1 tracking issue. ..
2013-12-21 by Hugh Vartanian
When I worked on a solus some time ago I recall a bunch of bad 1458 op amps. Also, some chip or part that got quite hot & popped when the tempco resistor was
Jupiter 6 PSU.
2013-12-21 by plat@simnet.is
Hi everyone . I am working on a Jupiter 6 PSU and I am having problems with the 5v dc. It seems that when the psu is disconnected from the synth then
Finally digging back into the Siel DK600 pile..
2013-12-21 by <sounddoctorin@...>
As many of you know these are often riddled with issues from the battery leaking etc. I have an expander version here that had a few bad buss interface
RE: ETI/Maplin 4600 group
2013-12-21 by <synthparts@...>
Got a link to the group? I have a Maplin 5600 I hope to someday get all working again...
RE: ETI/Maplin 4600 group
2013-12-20 by <djmikemills@...>
hmmm i would definitely be interested in this.
Re: [vintagesynthrepair] OT My new electronic music project
2013-12-20 by Daniel Forró
Sorry for shameless self promotion, but I started to work on the new music project. Here are the first three CD finished. Check or buy if you find it
RE: ETI/Maplin 4600 group
2013-12-20 by <paul.rak@...>
Link?
RE: ETI/Maplin 4600 group
2013-12-20 by <paul.rak@...>
Link?
ETI/Maplin 4600 group
2013-12-17 by <mylaptop@...>
Hi Gang, Just a quick note to invite those interested in the ETI/Maplin 4600 family of synths to a new group specialising in them, to include repairs,
OB-8 Processor board problem
2013-12-16 by <adhmzaiusz@...>
For some reason it seems that this message didn t go out so I m trying again... ... Wondering if anyone has any advice for me on this problem my OB8 just
Oberheim OB8 Processor board issues
2013-12-15 by <adhmzaiusz@...>
Wondering if anyone has any advice for me on this problem my OB8 just developed. I recently installed the encore midi interface to my OB and it s worked pretty
Oberheim OB8 Processor board problem
2013-12-15 by Gregory Cox
Wondering if anyone has any advice for me on this problem my OB8 just developed. I recently installed the encore midi interface to my OB and it s worked pretty
RE: [vintagesynthrepair] ARP Solus OSC1 tracking issue. ..
2013-12-14 by Lorne Hammond
So reachable through the front panel are: VC01 V/oct = R62 on the top of the vco section by the line on the right VC01 Initial Frequency =R56 above the first
Re: [vintagesynthrepair] ARP Solus OSC1 tracking issue. ..
2013-12-12 by kslinkard@...
You re certainly off to an excellent start, you have schematics, such as they are, and a good oscillator to do direct comparisons with. The tool I ve found
ARP Solus OSC1 tracking issue. ..
2013-12-09 by <salsole@...>
Hello all... I don t know whether the last message I sent made it through or not... Anyhow. I am working on an ARP Solus that had a dead VCO1. I replaced the
ARP solus OSC1 tracking issue...
2013-12-08 by <salsole@...>
Hello all... I don t know whether the last message I sent made it through or not... Anyhow. I am working on an ARP Solus that had a dead VCO1. I replaced the
ARP Solus tracking issue...
2013-12-08 by <salsole@...>
Hi all. I am working on an ARP Solus at the moment that had a dead osc1, which was easily remedied by changing the 1.87k ohm tempco resistors (r60 & r98) which
Re: [vintagesynthrepair] Korg Polysix
2013-12-03 by Malte Rogacki
You may want to subscribe to PolySix@yahoogroups.com (which - as you might guess - is a dedicated Polysix users and repair group). In general I tend to no
Korg Polysix
2013-12-03 by Christian Schonberger
Hi all, Well I recently dug out my old 1982 Korg Polysix. It is dead a long time ago. Sure enough the original (Varta) battery is still there, laked and left
Korg Polysix
2013-12-03 by Christian Schonberger
Hi all, Well I recently dug out my old 1982 Korg Polysix. It is dead a long time ago. Sure enough the original (Varta) battery is still there and left some
Micromoog oscillator control summing problem
2013-12-03 by Leigh Smith
Hi All, A Micromoog with a good steady power supply (-15.00V, 14.53V), and all other circuits working, has an incorrectly scaled oscillator, that can t be
Crumar Stratus Front Panel and a few bits
2013-11-18 by <f115@...>
Hey Folks - Just putting it out there that I have Stratus top panel and a some of the metallic hardware I just pulled out of storage. I may have a few pcbs in
Re: [vintagesynthrepair] Kurzweil SP88X
2013-11-14 by Roger J
You will have to remove the button panel and replace the tac(tactile)switch under the button. It does require de-soldering and soldering the replacement
RE: Re: [vintagesynthrepair] RE: Reintroducing myself/ Sound Doctorin'
2013-11-13 by <sounddoctorin@...>
Yeah same here pretty much. A guy from France just used security double envelope to send cash the other day. That s fine with me. Not many people have the
Kurzweil SP88X
2013-11-13 by <dan-kelly@...>
One the the buttons for selecting patches on my keyboard is slow to respond. before I open this up I would like to know if this is something that someone with
Re: Korg SQ-10 - wavering in pitch...
2013-11-07 by scott frye
De-oxit is helpful but something else needs to contact the leads to remove oxides and such. Laying down an IC on edge so that all the pins on one side can be
Ensoniq VFX Firmware Bins
2013-11-06 by <gonzinigonz@...>
Shot in the dark... Can anyone get hold off or upload the plain VFX firmware V2.30? It should be 2 EPROM s, lower & upper. Cheers
Re: [vintagesynthrepair] RE: Korg SQ-10 - wavering in pitch...
2013-11-06 by Tom Butcher
In general, is the 1000 grit sandpaper the best way to clean ICs? I have an Oberheim DMX project I m working on, and the boards and chips are all super dirty.