Re: [vintagesynthrepair] Korg X5 keys not working
2012-05-12 by Daniel Forró
... I m in Japan, but nowadays shouldn t be problem to order from USA. I tried to find modern substitution but they differs in some spec parameters so I m not
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Re: [vintagesynthrepair] Korg X5 keys not working
2012-05-12 by jammie
yes but its easier than doing a new lcd display ... From: 65 Lotus To: vintagesynthrepair@yahoogroups.com Sent: Saturday, May 12, 2012 3:03 PM Subject: Re:
Re: [vintagesynthrepair] Korg X5 keys not working
2012-05-12 by 65 Lotus
... So you re-backlit a SY99 huh. I ve done it twice; It s not for the faint of heart!
Re: [vintagesynthrepair] Korg X5 keys not working
2012-05-12 by jammie
optrex stop doing those displays becuase they were not rhos compliant they have equivelents same spec but use led back lights meaning they are about 7mm
Re: [vintagesynthrepair] Korg X5 keys not working
2012-05-12 by Daniel Forró
OK, with older gear everything is possible :-) You do good job with our beloved old machines! Right now I m thinking about changing displays in my Yamaha SY99,
Re: [vintagesynthrepair] Korg X5 keys not working
2012-05-12 by jammie
hi daniel i have repaired many yams and korgs and have had to do this on queit a few keybeds as knowing from experience and seen first hand that it can happen
Re: [vintagesynthrepair] Korg X5 keys not working
2012-05-12 by Daniel Forró
Again - in the case of metal contacts there s no reason why some keys would be bent and some not. Much probably it s dirty contact under rubber contact stripe,
Re: [vintagesynthrepair] Korg X5 keys not working
2012-05-12 by Daniel Forró
I m not quite sure but don t think X5 had keybed with metal contacts, only few Korg and Yamaha 5 octave instruments had such. And with metal contacts on such
Re: [vintagesynthrepair] Korg X5 keys not working
2012-05-12 by jammie
its easy to see and you dont have to remove any keys to do it remove the keybed and turn it upside down you can see all the contact springs just check for dirt
Re: [vintagesynthrepair] Korg X5 keys not working
2012-05-12 by jammie
they are yamaha keybeds theres a metal contact sping that when you press moves down onto a contact some times they get a little bent and when pressed they dont
Korg X5 keys not working
2012-05-12 by paxety
I have a Korg X5 bought new in 1995 or 6 - after sitting in a closet for a few years, a few of the keys no longer play. I connected it to a computer, and all
[vintagesynthrepair] Re: Omni MKI Note String Sustain problem ... and more
2012-05-10 by Malte Rogacki
I m a bit in a hurry; but if I m not mistaken the sustain switch is wired normally closed ; when no switch is connected the tip connection is routed to
Re: Omni MKI Note String Sustain problem ... and more
2012-05-10 by alesisfusion8hd
Have you checked Z3 & Z4 on String Control Board?
Re: Omni MKI Note String Sustain problem ... and more
2012-05-10 by Boddington
Hi again - just a follow up. It wasn t an issue with the sustain jacks. I even disconnected them but it didn t make a difference :(
Prodigy scaling problem
2012-05-10 by ambrosia800
Hi there... I have a problem with my Prodigy, first version. After switching it on, the scaling of OSC2 id not working properly anymore. Even if I turn the
Re: [vintagesynthrepair] Re: Simmons SDE
2012-05-09 by jammie
these are the items for the 79xx series of regulators the 16v caps are for the ripple of the rectifiers so the input voltage would be around 12-15vdc from the
RE: [vintagesynthrepair] Re: Simmons SDE
2012-05-09 by John Rose
The info was in the link I put to the data sheet in an earlier post, but for reference these are the 2 links you need
Re: Simmons SDE
2012-05-09 by Christian Oncken
So it turns out, looking around for info on those ICs, the 7805 and 7806 parts have the the metal tab connected to ground, the 7906 has it connected to -6v...
Re: Simmons SDE
2012-05-09 by hughvartanian
Christian, r. Do you have the p/n for the 3rd thing on the heatsink? 2. Both the regulators 7805 & 7806 have grounded and MUST be screwed to the hs or they
Re: [vintagesynthrepair] Re: Simmons SDE
2012-05-07 by jammie
dont know the size of the input output trannies of the simmonds sde im only going on experience with linear supplies with power regs the higher the input
Re: [vintagesynthrepair] Re: Simmons SDE
2012-05-07 by jammie
they are a thin square strip for the back of the power regulator and a small thermal plastic washer with an internal raising that sits inside the hole of the
Re: [vintagesynthrepair] Re: Simmons SDE
2012-05-07 by Christian Oncken
very strange.. I m pretty sure the ICs were not insulated from the heat sink when I opened it up. So either they weren t in thermal contact with it with a very
Re: [vintagesynthrepair] Re: Simmons SDE
2012-05-07 by jammie
78xx series are all right to earth its the 79xx series that are not they have to be insulated but you can get fully plastic packages that dont need insulating
RE: [vintagesynthrepair] Re: Simmons SDE
2012-05-07 by Hugh Vartanian
Hi, I m pretty sure 78xx pos regulators have pin 2, the tab, grounded. In-gnd-out. The 79xx neg regulators have output on the tab, iirc. Datasheets easy to
RE: [vintagesynthrepair] Re: Simmons SDE
2012-05-05 by Brian
Hi Christian The 78 series regulators usually have the metal mounting tab connected to the output terminal, pin number 2. So if you ground the tab you will
Re: [vintagesynthrepair] Re: Simmons SDE
2012-05-04 by jammie
it need a thermal insulated tab and a insulated washer with a inner groove to line up with the hole on the regulator then you have a nut and a insulated washer
Re: [vintagesynthrepair] Re: Simmons SDE
2012-05-04 by Christian Oncken
So I swapped out the 7805 and things are a little better, but different. First of all, I can actually hear the FM generators functioning now in response to
Re: Freeman String Symphonizer Schematics?
2012-05-04 by scituate_mass
Hey Paul, Congrats on getting it up and running. And thanks to evening1 for confirming the top octave thing. I haven t played mine in a while... it s too big
Re: [vintagesynthrepair] Re: Freeman String Symphonizer Schematics?
2012-05-03 by Paul Krull
Thanks for the pointers. The tech has already fixed my divider issues and a dead key that left the factory with no solder as well as a couple other little
Re: [vintagesynthrepair] Re: Freeman String Symphonizer Schematics?
2012-05-03 by evening1
You are correct, the upper voice doesn t sound in the highest octave of the keyboard. I know this because I spent an hour trying to find the problem when I
Re: Freeman String Symphonizer Schematics?
2012-05-03 by scituate_mass
I think I got this from that CEM3374 site. I m posting an alternative link: umich.edu/~damont/Freeman_String_SM 2.pdf Have your tech check the stacked circuit
Freeman String Symphonizer lamp
2012-05-02 by John Wieczorek
I need one bulb for my freeman. The service manual gives a part number of 939-020499, but nothing comes up in searches. I ve tried my local old-time
Re: Freeman String Symphonizer Schematics?
2012-05-02 by andré
hello I left for the group the freeman string ensemble brochure and service manual, i found the document on the archive part of
Re: [vintagesynthrepair] Freeman String Symphonizer Schematics?
2012-05-02 by Nicolás Dinapoli Fariña
http://www.markglinsky.com/ManualManor.html Just ask him, and he´ll email you a download link. Good luck. ________________________________ De: PeWe
Re: [vintagesynthrepair] Freeman String Symphonizer Schematics?
2012-05-02 by PeWe
You have it now ...
Re: [vintagesynthrepair] Freeman String Symphonizer Schematics?
2012-05-02 by Paul Krull
Hi Folks: I ve finally got my Freeman String Symphonizer in the shop for repairs but now find the link below broken. Does anyone have the schematics for
RE: [vintagesynthrepair] Re: Simmons SDE
2012-04-30 by John Rose
I would be inclined to change the 7805 as there are a quite a cheap component as this is where the voltage is low, if you use the 1A version as per the
Re: [vintagesynthrepair] Re: Simmons SDE
2012-04-30 by Christian Oncken
Hi Alan, I found a jumper on the PS board that the carries the 5v to the ribbon cable header. I unsoldered this instead to avoid clipping the IC lead... The
Re: [vintagesynthrepair] Re: Simmons SDE
2012-04-29 by Alan Probandt
The 7805 output is low but not low enough that the system shouldn t work. It may be drawing too much current on the +5Volt. Got a soldering iron, a pair
Re: Simmons SDE
2012-04-29 by xjnx0x
Thank you all so much for tips so far. I took some measurements of the ICs in the power supply, the rest of the device was connected during the measurements.
Re: Simmons SDE
2012-04-26 by xjnx0x
Frankly I had little hope for this because of the many comments I ve heard lately about Simmons current state.. they ve been bought out by Guitar Center
[vintagesynthrepair] Re: Simmons SDE
2012-04-25 by Malte Rogacki
I don t think the current Simmons has anything to do with the old Simmons ; I believe just the brand name was purchased. There is a yahoo group for old
Re: Simmons SDE
2012-04-25 by bluejinn
Not trying to be cheeky, but have you contacted Simmons about getting a schematic? I couldn t find a phone number, but found this link:
Re: Simmons SDE
2012-04-25 by xjnx0x
Responding to both at once... Alan, I really don t think its 60hz hum. Its much more digital and a much higher frequency and varies quite a bit over time.
RE: [vintagesynthrepair] Re: Simmons SDE
2012-04-25 by John Rose
Try having a look at this http://www.onsemi.com/pub_link/Collateral/MC7800-D.PDF it is the data sheet for ON semi s 78xx range may help with the pinouts, also
Re: [vintagesynthrepair] Re: Simmons SDE
2012-04-24 by Alan Probandt
The description sounds like a linear power supply as were common for music gear in the mid 1980s. In the 1990s small units (between 500 milliAmps and 1 Amp)
Re: Simmons SDE
2012-04-24 by xjnx0x
Thanks for your reply, to clarify the power supply is 120V input and is built into the unit on its own little PC board with little plastic offset clips, inside
Re: [vintagesynthrepair] Simmons SDE
2012-04-24 by Alan Probandt
First off, there s several types of power supplies. The type that plugs into the wall and converts 120VAC (220vac in UK and Europe) to, generally, +5VDC and
Simmons SDE
2012-04-24 by xjnx0x
HI, I m new to the list. I have a beloved Simmons SDE that started acting flaky circa 1998. The SDE is a 6 voice, 4-op FM percussion synthesizer midi rack
Re: ARP Omni I not producing sound
2012-04-20 by Alexis V. Rogers
Check all the connectors against the schematic, I ve noticed on a few Omnis that the color coding was reversed from the service manual. -Alex