RE: Repairing faulty AT sensor
2013-12-05 by <pyjamagroove@...>
http://groups.yahoo.com/neo/groups/yamahacs80/photos/albums/1557574004/lightbox/1720453728 There it is. You can see it´s pretty banged up there. And the
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RE: Repairing faulty AT sensor
2013-12-05 by <joachim.milson@...>
... That s rather strange. Why would someone do that? This would only produce an increased current consumption. Are you sure that the 67k is between -15 and
RE: Repairing faulty AT sensor
2013-12-05 by <pyjamagroove@...>
Well, I´m back at the beginning. Adding resistors does not seem to change anything. The outgoing voltage from the AT sensor is 14.2V. It should be 4
RE: Repairing faulty AT sensor
2013-12-04 by <pyjamagroove@...>
So after placing the 6.7K resistor between -15 and T3 in place of the broken carbon track it came alive a little. I read 0.7V drop. So I guess I need a bigger
RE: Repairing faulty AT sensor
2013-12-04 by <pyjamagroove@...>
Ive just noticed ,that the little carbon track is broken ( the one between -15 and T3). What is it´s function? Resistance? Ive just noticed ,that the little
Repairing faulty AT sensor
2013-12-04 by <pyjamagroove@...>
I´ve tracked my G3 AT problem to the sensor itself. After the keys were removed I´ve seen that somebody was there before me and placed a 67K resistor between
RE: One key problem - always at highest brilliance...
2013-12-04 by <joachim.milson@...>
Changing the wire seemed a risky task, and I didn t know what it was made of. So I used a drop of superglue between the metal strip and the wire (the wire was
RE: One key problem - always at highest brilliance...
2013-12-04 by <pyjamagroove@...>
Thanks for the tip Joachim. I will look into it. How did you repair your broken contact wires?
RE: One key problem - always at highest brilliance...
2013-12-04 by <joachim.milson@...>
I m glad you fixed it. Now, concerning the general velocity problem with your keyboard, you should check the velocity contacts closely. I ve just posted a
RE: One key problem - always at highest brilliance...
2013-12-03 by <pyjamagroove@...>
Resoldered 1M, now it works perfectly! Thanks everyone and especially Joachim for your patience. I´ve learned a lot today! Resoldered 1M, now it works
Re: Hello, new member with a few CS-60 questions...
2013-12-03 by leefordwatford@bellsouth.net
Sorry for all of the posts... I traced signal all the way to CP3, right before the VCA (IC4). I get only sine at CP4. I checked the trimmer for that VCA, it s
RE: One key problem - always at highest brilliance...
2013-12-03 by <joachim.milson@...>
David certainly found it. The 1M resistor is most certainly defective or badly soldered.
RE: One key problem - always at highest brilliance...
2013-12-03 by <joachim.milson@...>
You write that you track signal to IC4. Do you mean that there is a voltage at pin 15 (D#5) as long as the key is pressed ? Normally, you should first measure
Re: [yamahacs80] RE: One key problem - always at highest brilliance...
2013-12-03 by David Rogoff
... Sounds like you’re missing the 1MΩ resistor to ground (or the 22k - don’t remember which one is initial touch and which is aftertouch) for that note
RE: One key problem - always at highest brilliance...
2013-12-03 by <pyjamagroove@...>
Wow. Crazy. If I touch with my multimeter pin 3 or 15 of IC4 the key, AT, IT works! But the multimeter has to be turned on....I read there 0.14V to 6,5V fully
RE: One key problem - always at highest brilliance...
2013-12-03 by <pyjamagroove@...>
It´s a key related of course - cycling through the voices makes same effect on that key. Always high like aftertouch is maxed all the time... I swapped the IC
RE: One key problem - always at highest brilliance...
2013-12-03 by <joachim.milson@...>
OK. So there is some coherence in this issue. The first thing is to check the NMJ4558 (or what you changed them for) and the sockets. Also try swapping IC4 and
RE: One key problem - always at highest brilliance...
2013-12-03 by <pyjamagroove@...>
Hitting the velocity on that key does nothing. It´s always at full volume/brilliance. This board was fully recapped and new IC´s were installed in sockets. I
RE: One key problem - always at highest brilliance...
2013-12-03 by <joachim.milson@...>
Check velocity by ear for D#5. Compare with an other key. From the TSB, through the TKC and until the TWS, the velocity and the aftertouch signals follow the
RE: One key problem - always at highest brilliance...
2013-12-03 by <pyjamagroove@...>
I read at T2 -512 terminal +4.9V and it drops to 0 when pressed. Just like other keys. I don´t know is that it.. I read at T2 -512 terminal +4.9V and it drops
RE: One key problem - always at highest brilliance...
2013-12-03 by <pyjamagroove@...>
Ok, double checked -you´re right. They are the same. So I have AT there but can´t hear it work - it seems to be fully open all the time. How should I check
Re: [yamahacs80] RE: One key problem - always at highest brilliance...
2013-12-03 by Joachim Milson
What happens at terminal 511 is OK. Could you check if the velocity is OK for D#5 ? Concerning terminal 505, it s a bit strange: if you press C#5, you should
RE: One key problem - always at highest brilliance...
2013-12-03 by <pyjamagroove@...>
Thanks Joachim, At the terminal 511 I read -0.49V with no key and +6.9V fully pressed.... At 505 I read -0.38V and it does not change pressed or not....
Re: [yamahacs80] Re: Hello, new member with a few CS-60 questions...
2013-12-03 by Robert Stewart
When probing cards, I put a sheet of A3 behind them and rest them on the rack. Seems to do the trick. ... When probing cards, I put a sheet of A3 behind them
Re: Hello, new member with a few CS-60 questions...
2013-12-03 by leefordwatford@bellsouth.net
Thanks for the ideas! I like the table...when I pulled the card the first time I thought, it would be nice to have a flat surface to work on! I did check the
RE: One key problem - always at highest brilliance...
2013-12-03 by <joachim.milson@...>
Are you sure the velocity is OK for that key ? Check this first. I ll suppose so. (if not, ignore the lines below as the issue might not be the aftertouch).
Re[2]: [yamahacs80] Re: Hello, new member with a few CS-60 questions...
2013-12-03 by rikard.latvala@...
table.JPG upploaded into the files section :) ... Från: rikard.latvala@posthem.se Till: yamahacs80@yahoogroups.com Datum: 2013-12-03 01:15 Ämne: Re:
Re: [yamahacs80] Re: Hello, new member with a few CS-60 questions...
2013-12-03 by rikard.latvala@...
Hey, Do you have access to an oscilloscope ? Try probing the output of the filter ic Easiest way to do this is to solder a wire to the output pin or do as I
Re: Hello, new member with a few CS-60 questions...
2013-12-02 by leefordwatford@bellsouth.net
Hi, finally got a little time to try swapping filter chips around, same issue. I checked the trimmers, they seem okay, do I move on to wave shaper or
One key problem - always at highest brilliance...
2013-12-02 by <pyjamagroove@...>
That is really weird. And it´s only one key! I still don´t know exactly how to track key signals so I have to ask....My D#5 key does not react to aftertouch.
Re: [yamahacs80] CS80 on the table....will it overheat?
2013-11-28 by Bob Stewart
Given how temperature sensitive they can be, I d put it up on blocks so you ve got good airflow from the bottom. ... Given how temperature sensitive they can
Re: [yamahacs80] CS80 on the table....will it overheat?
2013-11-27 by Nigel Cruickshank
Maybe place a block of wood under either side to get some air flow going on. I wouldn t risk it. ... Maybe place a block of wood under either side to get some
CS80 on the table....will it overheat?
2013-11-27 by <pyjamagroove@...>
I´ve rearranged my home studio a bit and I´ve placed my CS80 on the flat surface. The top ventilation openings are uncovered but there is no airflow from
Re: [yamahacs80] Hello, new member with a few CS-60 questions...
2013-11-25 by Bob Stewart
Might also be a filter chip failure causing the loss of square, saw and noise. Try swapping the filter chips with another card to see if the fault moves with
Re: [yamahacs80] Hello, new member with a few CS-60 questions...
2013-11-25 by Rikard Latvala
Hey, about the light bulb, check if a well stocked gas station has them, I think I ve seen these 24v5w bulbs used in cars. If i remember correctly the
Hello, new member with a few CS-60 questions...
2013-11-25 by leefordwatford@bellsouth.net
Hi, thanks for the group, lots of good info! I recently acquired a CS60, that mostly works pretty well. The first, and easiest issue is to find out a modern
Re: [yamahacs80] New Member/ Tuning methods
2013-11-24 by Bob Stewart
I ve had stability issues with 60s and 80s relating to heat. If kept on, they re not too bad, but have had issues if they ve been switched off for Ny length of
Re: [yamahacs80] New Member/ Tuning methods
2013-11-24 by Florian Anwander
Hello David ... I did not have temperature related problems with the CS60s, but I can imagine, that the 80s really need the temperature. I already thougt about
Re: [yamahacs80] CS50 For sale / for parts?
2013-11-24 by Bob Stewart
If you were in the UK I d have buyers fighting over it!
CS50 For sale / for parts?
2013-11-24 by <velomatte@...>
I have a very nice CS50 that has the problem I described in my last email (functioning but very quiet saw and ramp waves in VCO across all voices, with working
Re: [yamahacs80] New Member/ Tuning methods
2013-11-24 by David Rogoff
Hi all. I donÆt think frequency counters are useful at all for tuning. You can do it all - and very quickly - just using a reference tone and beating tuning
Re: [yamahacs80] New Member/ Tuning methods
2013-11-22 by Florian Anwander
Hello Frederik thanks for the welcome! ... Do you tune with a frequency counter or with a chromatic tuner? Until now I had no frequency counter, so I used a
Re: [yamahacs80] New Member
2013-11-22 by Fredrik Segerfalk
Hi Florian and welcome to the group! That s a great and simple mod! I always turn the power off and on when tuning to reset the voice count. It s certainly
New Member
2013-11-22 by Florian Anwander
Hello I d like to introduce myself. My name ist Florian Anwander. I live in Munich, Germany, and I am doing synth repair as side job. I work most times on
CS50: Quiet square and saw waves
2013-11-21 by <velomatte@...>
Guys, I am working on my CS50 and it seems like the saw and square waves on the VCO are really quiet compared to everything else. They turn on and off as they
RE: RE: Silent key problem
2013-11-16 by <pyjamagroove@...>
Well, it`s not that I´m lazy guys. My knowledge of electronics is very basic and I don´t want to short anything. 1.Could someone walk me through on an
RE: Silent key problem
2013-11-15 by <pyjamagroove@...>
Well it got a little more complicated when I looked closer to it... - There is no IT at all on CH1 voice 7 - Keys A3 and H3 are producing much higher IT
RE: What did I brake on my CS80 now?!
2013-11-14 by <pyjamagroove@...>
That was it! Thanks Dave. I can go back to my repairs (breaking stuff) now. ... I’ve had this many times. You probably took out the +8.5v or -6.5v digital
Re: [yamahacs80] What did I brake on my CS80 now?!
2013-11-14 by David Rogoff
IÆve had this many times. You probably took out the +8.5v or -6.5v digital supply. ThereÆs 2 fuses - one for each. Watch out since (at least on the USA
What did I brake on my CS80 now?!
2013-11-14 by <pyjamagroove@...>
It slowly becomes a horror. I was changing 0.33 caps on my TSB2 board and while soldering I accidentally turned the synth on with my elbow ( I never leave it