ARP Omni I not producing sound
2012-04-20 by Mark
I recently acquired an ARP Omni I in pristine physical condition, not a scratch on it! When I turned it on, there was a drone, which I assumed was a stuck
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Progress Re: Jupiter 6 common no sound problem
2012-04-19 by adhmzaiusz
Well, it may appear I ve run into a potential happy mistake. Today when I tried my next attempt to get my JP6 on its feet, I realized that yesterday when I
Re: [vintagesynthrepair] Progress Re: Jupiter 6 common no sound problem
2012-04-18 by jammie
check the cv dac and the sample and hold multiplexers ... From: adhmzaiusz To: vintagesynthrepair@yahoogroups.com Sent: Wednesday, April 18, 2012 2:06 PM
Progress Re: Jupiter 6 common no sound problem
2012-04-18 by adhmzaiusz
Hey everyone, just wanted to mention that I ve made some progress with my JP6. Since I got it I always thought it was a little strange that on the 4 voice
Re: Looking for DX7 service manual
2012-04-09 by alesisfusion8hd
Hi group, still spending some time on a non-booting DX7, but close to give up. To summarize: - the DX7 doesn t boot half of the time, LED displaying a blinking
Re: [vintagesynthrepair] Re: Oberheim OB8 Problems....
2012-04-09 by plat@simnet.is
Thanks guys , I have exactly the same problem ,changed all the caps except these ones. I will try this next. Thanks Arnar ... Frá: adhmzaiusz
Re: Oberheim OB8 Problems....
2012-04-09 by adhmzaiusz
Check for cold solder on the .022mfd polystyrene caps (clear axial looking caps) that are at the left side of each voice board. I had voices that wouldn t
Oberheim OB8 Problems....
2012-04-08 by Damir
Hi guys and first of all happy easter!!! I have some free time finally so decided to check OB8 ... It had few problems but ... found dead TL081, CA3080 ...
Re: TC40Hxxx vs 74LSxxx
2012-04-08 by adhmzaiusz
Thanks John, thats very helpful! Greg
Re: [vintagesynthrepair] Does anyone have a three way switch for an Octave Cat/Kitten?
2012-04-08 by Grant B
Can you take a picture of what s left or a similar one on the same unit?
Re: [vintagesynthrepair] TC40Hxxx vs 74LSxxx
2012-04-08 by John Henson
Hi Greg, You are on the right lines but the wrong IC type. The 40Hxxx are the Toshiba version of the 74HCxxx series. 40Hxxx s are often used in Japanese synths
TC40Hxxx vs 74LSxxx
2012-04-08 by adhmzaiusz
Hi, just out of curiosity, are the TC40HXXX ICs directly compatible with the 74LSXXX chips? When i search for the description of any TC chip and match a 74LS
Does anyone have a three way switch for an Octave Cat/Kitten?
2012-04-07 by heathfinnie
I have an Octave Cat SRM and I need a 3 way switch for it. The one thats there is missing the white top (broke off) and I want to replace it. It s the switch
Re: Sequential TOM blew up?
2012-04-06 by Robert Weigel
THanks but yeah it s 2.5V *without power* (I wasn t clear about that)...so it s impossible for it to be dragging anything down except the memory itself.
Re: Sequential TOM blew up?
2012-04-05 by Scott
... Also, disconnect the battery to see if it s dragging the ckt down somehow
Re: Sequential TOM blew up?
2012-04-05 by Scott
... Battery voltage wont determine regular operation. Can you scope the power supply circuits and look for ripple? Can you disable certain sections ( by
Re: [vintagesynthrepair] Sequential TOM blew up?
2012-04-05 by John Henson
Hi Bob, My totally dead Tom was due to a faulty RAM chip,the one not in a socket! Similar symptoms, all power and clocks but no lights. Not having the service
Sequential TOM blew up?
2012-04-05 by Robert Weigel
Guys were over recording from Portland and this thing wrecked the last session here. hehe. Hoping we can get it up before they leave. The problem is the
Re: Jupiter 6 common no sound problem
2012-04-04 by adhmzaiusz
Actually I d like to add that when it unfreezes its not just about fully waiting it out, I think its after a while + flipping SW1. Also it seems the only led
Re: Jupiter 6 common no sound problem
2012-04-04 by adhmzaiusz
Yea, its locked up for the most part. Lfo 2 speed can still be adjusted immediately, but it seemed that after I wait a while the panel controls seem to
Re: [vintagesynthrepair] Jupiter 6 common no sound problem
2012-04-03 by Malte Rogacki
So did I get this right: At first the machine seems to be completely locked up? Then after a while the controls (buttons, LED s and so on) start to work but
RE: [vintagesynthrepair] Jupiter 6 common no sound problem
2012-04-03 by Lorne Hammond
I could be way off my understanding if its like the tr-909 that using capacitors and zeners to a dual transistor set, to hold the voltage back until it builds
Re: [vintagesynthrepair] Jupiter 6 common no sound problem
2012-04-03 by jammie
reset should be a momentary pulse usually 5v if it is constant held high then it will be in constant reset plus being 10v for a cpu chip is to high a voltage
Re: [vintagesynthrepair] Jupiter 6 common no sound problem
2012-04-03 by Malte Rogacki
Reset on the Jupiter-6 I believe it goes like this: The Reset voltage coming directly from the Power Supply is indeed a fixed voltage. It just takes a little
Jupiter 6 common no sound problem
2012-04-03 by adhmzaiusz
Hi again, so I found a messed up JP6 recently that I bought to try and get it up and running. It turns on with all the LEDs Lfo lights blink etc, but seems
Re: Yamaha CS 50 Sub Osc intermittent
2012-04-01 by synthparts
Sounds like a bad chip to me if it s getting its input but no sine output. I have the IG00158 if you need one. Doug, synthparts.com
Yamaha CS 50 Sub Osc intermittent
2012-03-28 by adhmzaiusz
Hello folks Lately I ve noticed the sub on the last voice of my cs50 totally disappears. Sometimes it comes back but mostly its off. I opened it up and
Re: Omni MKI Note String Sustain problem ... and more
2012-03-26 by Boddington
Oh now that s interesting! Ha! I ll look there for sure and let you know what I find. That could very well be it.
[vintagesynthrepair] Re: Omni MKI Note String Sustain problem ... and more
2012-03-25 by Malte Rogacki
I vaguely recall that I was having a similar problem; it turned out that the connector to the sustain foot switch was faulty (or backwards? can t remember).
Re: Omni MKI Note String Sustain problem ... and more
2012-03-25 by Boddington
Hi guys --- For som sections I begun a sweep of changes like that. Many of the switch ICs were gone. As were a pile of the tants. In the case of this unit most
Re: Omni MKI Note String Sustain problem ... and more
2012-03-25 by alesisfusion8hd
I fully agree as I spent some time restoring my MK1 as well. Almost 50% of my tantalums were dead (mostly shorted, but some open), and a few CMOS. You really
Re: [vintagesynthrepair] Omni MKI Note String Sustain problem ... and more
2012-03-24 by Mike
I also spent a while restoring a complete wreck of a MK1.. Mine had a few dead logic IC s & opamps... but 90% of the problems on mine stemmed from dead or
Re: Omni MKI Note String Sustain problem ... and more
2012-03-24 by Boddington
Oh! I also refered to more in my title. Does anyone, by a long shot, have a grey Belkin cable available? I m looking for a replacement for this MKI. Secondly
Omni MKI Note String Sustain problem ... and more
2012-03-24 by Boddington
Hi folks! I ve been trying to pin down a problem with an Arp Omni MKI. It was in horrid condition when it arrived so I ve gone a long way to recovering it. In
Re: [vintagesynthrepair] Re: How do i have to disassemble an old Lowrey organ?
2012-03-17 by Paul Krull
I m afraid I went through a short free organs from Craigslist phase and I own a Lowrey GX 325 which is the same as the GX 7000 which had keyboard contact
Re: [vintagesynthrepair] Re: How do i have to disassemble an old Lowrey organ?
2012-03-16 by Samuel Adams
I used to own one of those rare 3 manual G7000 organs...Nothing but trouble...A real nightmare! Good luck. ... From: Paul Krull To:
Re: [vintagesynthrepair] Re: How do i have to disassemble an old Lowrey organ?
2012-03-16 by Paul Krull
Actually, there s also a very active Lowrey organ group on Yahoo too with folks that would have experience with that organ. Paul T
OT. Leslie 910 with complete switch kit for sale
2012-03-16 by Mark Wallis
Sorry folks, I didn t mean to attach this to the last post: Hi Folks. Would any of you like to buy a rather splendid Leslie 910 rotary stack? Comes complete
RE: [vintagesynthrepair] Re: How do i have to disassemble an old Lowrey organ?
2012-03-16 by Mark Wallis
Hi Folks. Would any of you like to buy a rather splendid Leslie 910 rotary stack? Comes complete with the correct 900 series converter box and all 3 half-moon
Re: How do i have to disassemble an old Lowrey organ?
2012-03-16 by narfman96
Hi Martin, There is a very active combo organ Yahoo group that has some very knowledgeable techs as members.
How do i have to disassemble an old Lowrey organ?
2012-03-16 by martinreuter
Hi there, since a few days i own an beautiful Lowrey symphonic holiday. After some beers it sounds very nice. Well, it has some contact-problems in the
Re: Looking for DX7 service manual
2012-03-12 by alesisfusion8hd
I like the smell of a cooking CPU in the morning... Just checked the resistor values: OK. The Zener : I took the entire power board from my working DX7. Same
Re: [vintagesynthrepair] Re: Looking for DX7 service manual
2012-03-12 by GB
Maybe try a few reset chips instead of the cap. You can get them in TO-92 transistor packages and DIP too. ... From: alesisfusion8hd To:
Re: Looking for DX7 service manual
2012-03-12 by narfman96
At least it isn t trying to cook your breakfast... Is ZD1 the 6.2 zener on the power board shorted? Also have you checked the 39k and 82k actual values?
Re: Looking for DX7 service manual
2012-03-12 by alesisfusion8hd
Hi Narfman, no the 6805 doesn t get warn. I plugged another 10uF in parallel (giving 20uF), but no change. I tried with another power supply (and another
Re: Looking for DX7 service manual
2012-03-09 by narfman96
Good troubleshooting! Does the 6805 get warm? Since all the resets come from the same timing cap you could try a 22uf and see if the extra settling time helps.
Re: Looking for DX7 service manual
2012-03-09 by alesisfusion8hd
Just a follow up. I nailed down my issue to the Sub-CPU 6805 (IC 13) which sometimes does not boot up the right way. When I reset it by grounding pin 28,
Re: Looking for DX7 service manual
2012-03-08 by alesisfusion8hd
Thanks man, the tuning procedure is exactly what I was missing. I ve cleaned up all the connectors (on main board and sub boards); it didn t solve my issue,
Re: [vintagesynthrepair] Re: Looking for DX7 service manual
2012-03-08 by John Henson
Hi , A couple of years ago I had a Mk 1 DX7 in the shop that refused to boot. The usual checks for correct power and clocks showed all present and correct. The
Re: Looking for DX7 service manual
2012-03-08 by z3sound
hi there was no complete Service manual for DX7 (first edition) on the internet.but now it is i just upload the complete DX-7 first service manual in Files