Re: Problem with new KLM-367A
2010-09-06 by ieinzz
G, I ll send it in to you. When I was looking at the underside I noticed one of the jumper wires had broken off at an end. Lifting it up the other end broke
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RE: [PolySix] Re: Problem with new KLM-367A
2010-09-06 by backshall1 (dsl)
Sixty! And here I thought I was getting to be an old pro at these after dealing with eight. Don B. _____ From: PolySix@yahoogroups.com
Re: [PolySix] Re: Problem with new KLM-367A
2010-09-05 by klosmon
On a battery-damaged reconditioned board, there are endless possibilities. The synth was working when I repaired it (for whoever you purchased it from) --
Re: [PolySix] Re: Problem with new KLM-367A
2010-09-05 by Andrew Jury
Hi, No, this issue does not apply to the original board. This could be caused by all sorts of different problems. Something you might want to check is to make
Re: Problem with new KLM-367A
2010-09-05 by ieinzz
Turns out I don t have the clone board. Underneath it looks worked on, isn t signed, and I have the cross head trimmers on the topside. My problem seems to
Question about dead polysix
2010-09-05 by pctech333
I have a polysix that I got broken (battery leak) and I have been trying to fix. The board I had was pretty chewed up from the battery, worse than I had seen
Re: [PolySix] Re: Problem with new KLM-367A
2010-09-05 by Andrew Jury
Hi, You can easily tell if you have a clone board fitted. You¹ll find that there are six trimmer controls in the centre of the board. If they are round and
Re: Problem with new KLM-367A
2010-09-05 by n0disc0
Hello, The KLM-367 clone is signed djn & jed 2009 at the back of it (see picture) : http://img839.imageshack.us/img839/6033/clonesignature.jpg
Re: Problem with new KLM-367A
2010-09-04 by ieinzz
Just read this post below! I am having problems with instability with my patch banks jumping around. When I hit the switches for Programs 5-8 the patch
RE: [PolySix] Re: Hardware screw sizes for the Polysix
2010-09-04 by backshall1 (dsl)
Hi Andy, You seem to be off by one mm on some of the diameters. I haven t seen any M2 anywhere on the Polysix. All of the smaller ones are M3. Here are the
Re: [PolySix] Re: Hardware screw sizes for the Polysix
2010-09-04 by Andrew Jury
I know what you mean! I like to have all the Œright¹ bits fitted in mine and matching them can be a bit of an ordeal. The most difficult ones to find are the
Re: Hardware screw sizes for the Polysix
2010-09-04 by ML
Aaaahhh! Wooonderful. Huge thanks. This will be here for posterity! It s amazing how getting the right hardware for synths is actually a real pain (or maybe
Re: [PolySix] Re: Hardware screw sizes for the Polysix
2010-09-04 by Andrew Jury
Nothing like a good project, eh?! Here are the gory details for future posterity... 1. The four top panel outer screws: M3x14 black, pan cross head machine
Re: [PolySix] Re: Problem with new KLM-367A
2010-09-04 by Andrew Jury
Well let¹s put it this way, without the corporate press release. If you use a TL072 it will work and it won¹t change the authentic sound of the P6 we all
Re: Hardware screw sizes for the Polysix
2010-09-03 by ML
That would be amazing. I d greatly appreciate it. It s a pile of them! - The four top panel outer screws - The top panel inner screws that fasten the PCBs -
Re: Problem with new KLM-367A
2010-09-03 by ML
Oh ok - fair enough. I m just trying to differentiate which parts are attempting to remain true to the original and if there s a technical reason why one might
Re: [PolySix] Re: Problem with new KLM-367A
2010-09-03 by Andrew Jury
Hi, As before with other components the op-amp would have been selected because of general availability and the fact that the spec of the TL072 meets or
Re: [PolySix] Hardware screw sizes for the Polysix
2010-09-03 by Andrew Jury
Can you tell me which screws you have missing or even some photos of where the holes are wouldn¹t go a miss! I have two complete P6 here in bits and I can
Re: [PolySix] Re: Problem with new KLM-367A
2010-09-03 by Andrew Jury
Hi, Glad you are enjoying the entertainment! Seems after a 12 hour bashing the errant board I have been trying to diagnose is now stable. Replacing C23 with a
Re: Problem with new KLM-367A
2010-09-03 by ML
Andy can you clarify why the NJR4560 is swapped out for TL072P? I see that there are other 4560s out there that are available, though perhaps something in the
Hardware screw sizes for the Polysix
2010-09-03 by ML
Has anyone got a list of the correct screw sizes for the P6? I ve got one here that s missing almost all of the hardware and haven t got anything specific to
Re: Problem with new KLM-367A
2010-09-03 by ML
Thanks for covering so much ground so far. This thread has been an enormous help so far. I m following along closely!
Re: [PolySix] Re: Problem with new KLM-367A
2010-09-03 by Andrew Jury
Hi Malte, @aj: I feel we are making some progress here (at last)... ... [Non-text portions of this message have been removed]
Re: [PolySix] Re: Problem with new KLM-367A
2010-09-03 by Malte Rogacki
Andrew; your observations go along with my theory that this is a question of the balance of the clock signals. By attaching the probe to C22 (or XTAL1 at the
Re: [PolySix] Re: Problem with new KLM-367A
2010-09-02 by Andrew Jury
Hi Malte, You are right. The problem I have had is reproducing the problem. As I said earlier this fault wouldn¹t show itself for hours on end. I finally
Re: [PolySix] Re: Problem with new KLM-367A
2010-09-02 by Malte Rogacki
Andrew; I ve reverted to my previous version now (with the 10pF cap for C23) and the board has been runing fine now for several hours again. The problems with
Re: [PolySix] Re: Problem with new KLM-367A
2010-09-02 by Andrew Jury
This problem is an utter stinker! I have now had the suspect board running for almost 12 hours without a glitch. The owner was seeing consistent problem after
Re: [PolySix] Re: Problem with new KLM-367A
2010-09-01 by Malte Rogacki
Andrew; a 22pF cap between T0 and ground does not cure the lockups and crashes on my machine.
Re: [PolySix] Re: Problem with new KLM-367A
2010-09-01 by Malte Rogacki
Andrew; I m back to the previous configuration now (resonator, stock values) and have experienced the first lockup (which is insofar not completely correct
Re: [PolySix] Re: Problem with new KLM-367A
2010-09-01 by Andrew Jury
Malte, This is going to be a very tough problem to solve, I fear. However, I have been doing some experimentation here and have noticed that every time I probe
Re: [PolySix] Re: Problem with new KLM-367A
2010-09-01 by Malte Rogacki
Andrew; I m still in the theory stage of everything. It appears that my measurements as far as amplitudes went were probably completely off. They were done
Re: [PolySix] Re: Problem with new KLM-367A
2010-09-01 by Andrew Jury
Malte, Very interesting! We certainly do have a stray capacitance issue here. When I connect my scope to T0 and watch the pulse train going into the CPU the
Re: [PolySix] Re: Problem with new KLM-367A
2010-09-01 by Malte Rogacki
Food for thought: I have a datasheet for the 8048H and the 8048AH. Both contain examples for the clock circuit but both are slightly different. Both datasheets
Re: [PolySix] Re: Problem with new KLM-367A
2010-09-01 by Malte Rogacki
... I don t know. My preliminary hypothesis is as follows: It s a capacitance issue. The stray capacitance between XTAL1 and XTAL2 (Pin 2 and 3) is different.
Re: [PolySix] Re: Problem with new KLM-367A
2010-09-01 by Andrew Jury
This is good progress, but I wonder why lifting IC6 kills the issue dead? I see that programmable input T0 is pin 1 and clock is 2 and 3. You don¹t suppose we
Re: [PolySix] Re: Problem with new KLM-367A
2010-08-31 by Malte Rogacki
Update: A change of the value of C23 resulted in a higher amplitude of the XTAL2 signal. With this the board has been running stable for a few hours now; but
Re: (new) KLM-367 Calibration
2010-08-31 by Daniel A
Andy, ... The solder points look clean and have continuity. What readings should I be checking for on Q3? - Daniel
Re: (new) KLM-367 Calibration
2010-08-31 by Daniel A
Andy, retackling this board as well. I did order metal film resistors as the part list recommended and have installed most all as I am waiting on a few that
Re: [PolySix] Re: Problem with new KLM-367A
2010-08-31 by Malte Rogacki
So I ve tried to get a bit closer to possible problems and differences. Luckily I have a few old KLM-367 and 367A here (most in various stages of disrepair
Re: (new) KLM-367 Calibration
2010-08-31 by Daniel A
Andy, I am getting a 4volt drop saw tooth wave with a 1volt peak to peak (-4v to-5volt). - Daniel
Re: [PolySix] Re: Problem with new KLM-367A
2010-08-30 by Andrew Jury
...I suspect there is only a single issue here and that is with the d/a converter. As soon as I get back my errant board, which exhibits the problem, and
Re: Problem with new KLM-367A
2010-08-30 by Scott
... Is someone keeping track of all the issues with the KLM367A? I ll be building 3 and want to get as much of the crappy stuff out of the way
[PolySix] Re: Problem with new KLM-367A
2010-08-30 by Malte Rogacki
My bad, It s of course an 8048C here as well (8049 is the key assigner).
Re: Problem with new KLM-367A
2010-08-30 by n0disc0
... I can t answer this question as my cloned KLM-367 is using an original 8048C. But Andrew will certainly do.
[PolySix] Re: Problem with new KLM-367A
2010-08-29 by Malte Rogacki
... Yes, this is also similar to the symptoms my machine exhibits. ... ...and that s pretty much what my machine does all the time. Sometimes it takes only a
Re: [PolySix] Problem with new KLM-367A
2010-08-28 by Andrew Jury
Hi Malte, Think we might have a D/A problem here causing instability. Probably why taking IC6 out of circuit stops the random behaviour. Just looking for
Re: Problem with new KLM-367A
2010-08-27 by n0disc0
Hello Malte, Hi Andy, I am the forum member Andrew mentioned yesterday. I m not sure it could help you a lot but here is a description of my symptoms : Here is
Re: (new) KLM-367 Calibration
2010-08-27 by Daniel A
Thanks Andy, I am heading out for the weekend and will post results when I return. ... Yes. VR2 is not changing voltage. ... The MG level pot does not change
Re: [PolySix] Problem with new KLM-367A
2010-08-26 by Malte Rogacki
So things are looking a bit worse by now. I can no longer successfully make the D/A adjustment. This actually had happened before but the problem had
Re: [PolySix] Re: (new) KLM-367 Calibration
2010-08-26 by Andrew Jury
Hi Daniel, You are looking for 1 volt p-p, but VR2 does nothing and you have 3.8v p-p? Does decreasing the MG level control do anything to the output? You