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Page 18 of 155 · 7723 messages matched
2013-07-28 by Peter Mörck
Since there s a current rating, that resistor seems to be a fuse resistor . I don t think you should substitute it with something as high as 1W. Using the
2013-07-28 by Adrian Corston
I substituted a 1W 4.7 ohm carbon resistor in place of the 230mA 4.7 ohm one connected to Tr9 emitter and now the -5V test point measures a somewhat more
2013-07-28 by Adrian Corston
Thanks Peter - you re right, the 4.7 ohm resistor on Tr9 emitter is open circuit. According to the schematic and the board screening, it s rated 230mA ,
2013-07-27 by Peter Mörck
Looks like everything is pretty messed up now after the short then (Almost all rails are way off). Check with a scope as well for AC in the wrong places (if
2013-07-27 by Adrian Corston
I should correct a minor mistake I just made, sorry: I measured +5V on the /-5V test point/, but -26.7V on Tr9 s emitter. The -5V test point is the other side
2013-07-27 by Adrian Corston
I hate to reply to myself, but... I did some more work on this tonight, replacing a bunch of components. Since my last email I have replaced: - All ICs - Tr9 -
2013-07-23 by Quazimodo
I find an opened out paper clips works just fine. Of course you need to know exactly where to push it in... you can easily miss the little sprung blade..!
2013-07-22 by Terje Winther
Thanks - yes, this is what I use now, but it is so fiddly, and often I need to sit there for a while to make them come loose. Maybe I am too afraid to break
2013-07-22 by John Rose
If they are the oneÆs I think they are I use a very small flat blade screwdriver, jewellers screwdrivers are ideal as you can get very close to the ideal
2013-07-22 by Terje Winther
Hi, I don´t suppose anyone have an extra moog flag tool ? This is the minimoog flag tool that you use to release the small metal flags that are inside
2013-07-22 by Adrian Corston
... Thank you both for your suggestions. Unfortunately, one thing I did tonight was to accidentally short out pins on Tr9 to the case of Tr5. I was being so
2013-07-21 by eidorian@...
... Hi Scott, All the reported voltages were measured with the supply disconnected from the rest of the synth. I did measure some voltages early on with the
2013-07-21 by scott frye
I forgot to ask Are the supplies wired to the rest of the unit while you re checking levels? -- Scott Frye Audio-fixation.net Vermont
2013-07-21 by Hugh Vartanian
Hi, A little about the operation of this circuit when operating normally. Hopefully there is a hint in there that will get to the bottom of this! Note, no
2013-07-21 by The Wizard
I ve got a variety of Heath / Heathkit power supplies on my bench, and I like them (or they wouldn t still be there): IP-2718 Tri-output (but low current).
2013-07-21 by John Rose
Have a look on Youtube for EEVBLOG, he does a lot of reviews on test equipment and I seem to remember there are several bench PSU s covered. From you point of
2013-07-21 by Adrian Corston
I realise this is a fairly wide-open question, but hopefully some people will be happy to share their thoughts... I d like to buy a reasonable beginner
2013-07-20 by Peter Mörck
... I would expect it to be around -15.7V or so when the circuit is operating properly. Exactly how much is it? How much is base voltage of Tr21, Tr22 and
2013-07-20 by Adrian Corston
... Here we go... my responses are in red in the quoted text below. ... None of the above things that I tried had any effect; the -15V rail is still sitting
2013-07-20 by Mikael
Sorry, I don t know if replacing the display requires soldering, but it shouldn be too hard to desolder the wires from the old display and soldering them to
2013-07-20 by Malte Rogacki
Ah, scratch that. Different -15/+15V supply. Anyway; the Trouble Shooting Guide in the service manual gives the following procedure: 5. No voltage is put out
2013-07-20 by Adrian Corston
Thanks for your response Malte, and everyone else (including those off-list). I ll be having another look at the unit tonight and will try out the excellent
2013-07-20 by Malte Rogacki
I somehow don t quite understand: You re getting both +15V and -15V at the opamps, but you assume that something is wrong with the power supply because the
2013-07-20 by synthparts
Also check for any shorted tantalum caps throughout the synth... Doug synthparts.com
2013-07-19 by jacquesupitup
Thanks man i ll give a look this week! :)
2013-07-19 by Nick Bell
I d also check the electrolytic on the emitter of TR20 isn t pulling anything to ground ________________________________ From: Peter Mörck
2013-07-19 by Peter Mörck
Hi, The -15 and +15 values are probably right as they re derived from a zener diode + a PN drop, so 15-0.7 and -15+0.7, roughly. Sounds about right. From my
2013-07-19 by Adrian Corston
My CS-70m (which last worked about 4-5 years ago) has a power supply fault. With the power supply board disconnected from all voice and control circuitry I
2013-07-18 by stompboxaron
For parts etc... I order from this guy. Now I have bought the bushings, but I haven t put them in yet. http://sounddoctorin.com/synthtec/parts/key.htm Hope it
2013-07-17 by Adrian Corston
The OP wasn t talking about key bushings - he was talking about the plastic caps for the hammer action thingy (I have no idea what it s called). I use DC7 as
2013-07-17 by Samuel Adams
Thanks Mikael. Do you know if it s a simple plug-in replacement or is there resoldering involved? Greg ... From: Mikael To: vintagesynthrepair@yahoogroups.com
2013-07-17 by 65 Lotus
Same here. Pay attention when installing them; look at how they re molded and how the old ones are installed, There is an up side and a down side. ...
2013-07-17 by Mike Kearney
I have used these: http://www.vintagevibe.com/p-484-synthesizer-key-bushings.aspx For $25. plus shipping and an evening s work, they made my P-R keybed work
2013-07-17 by jammie
the reason for it is for a buffer for the guide so that plastic is not rubbing on metal which makes noise on the korgs and the kawai they used heat shrink
2013-07-17 by Daniel Forró
This looks like a good idea. Picture would be good. How thick is that tube? What was original use for it, if I want to buy such? Which grease did you use, some
2013-07-17 by jammie
heat shrink tubing is also good for this and some proper rubber/plastic grease ... From: Adrian Corston To: vintagesynthrepair@yahoogroups.com Cc: Quazimodo
2013-07-17 by Adrian Corston
I recently did a P-R keyboard restoration using short pieces of 3mm (approx) diameter flexible clear plastic tubing for exactly this purpose. They didn t have
2013-07-17 by Quazimodo
Hi everyone, I am looking for some Pratt-Reed keyboard spares. Those little rubbery greased caps that fit underneath each key and sit on top of the
2013-07-17 by Mikael
You could also replace the whole screen, it seems like Syntaur has them in stock: http://www.syntaur.com/alesis_qs.html . Syntaur is great, fast and friendly
2013-07-17 by Mikael
Hi, You should first check all the fuses, there are hopefully fuses for all the different power lines by the power supply. If you are lucky then you only need
2013-07-16 by jacquesupitup
Hi guys i am new here! I ve recently bought a crumar 2003 organ. At the time of moving it into my flat (a very heavy beast) i ve decided to remove the
2013-07-14 by Samuel Adams
Thanks. Any idea where I can get another light, what the cost would be and how hard is it to replace the backlight? ... From: jammie To:
2013-07-14 by Daniel Forró
I m sorry I can t help more, I don t know this instrument... Daniel Forro
2013-07-14 by RayMead@cfl.rr.com
I have had the back off but cannot see how to remove the Circuit Boards that are situated under the Keyboards. I am not sure what or how these are held in. I
2013-07-14 by Daniel Forró
If factory reset didn t help, maybe it s time to open the instrument and do usual stuff - check and clean all connectors, reseat IC s in sockets, check PSU if
2013-07-14 by jammie
thats the back light replace with new ... From: Samuel Adams To: vintagesynthrepair@yahoogroups.com Sent: Sunday, July 14, 2013 12:52 AM Subject:
2013-07-13 by Samuel Adams
I have an Alesis QS 6.1 with the display being darker on the right hand side gradulatulating to full bright to the left. The dark end is about 70-75%
2013-07-13 by RayMead@cfl.rr.com
Hi all I am really new to this group, we have aLegend by Estey, sold by Fletcher Music of Florida. This machine is not working, we have tried all the factory
2013-07-13 by Nicolas
Hi, Thank you for the information. I was able to increase the pitch bend wheel range by lowering R25 to 470K and adding 100K trimpot in serie. I also add to
2013-07-11 by duncan
(schemo added to files section)