Greetings again! It's been a year or longer, but I finally got around to purchasing another Polysix. I'm interested in some mods for the thing, especially... ...
I've been recovering this one, found in the flea market. Overall it had about 8-9 different faults that I fixed, leaving two problems. The first is a bad...
Hi, I only have the schematics for the MK I; which I do not know whether it is similar to the MK II. Which VCO has the problem? Is it VCO-1 or VCO-2 or both?...
Hello, Again here is a polysix with the "no sound at all" problem. When I measure with oscilloscoop on KLM366 (new) ic 9 pin 1 there is a constant pattern but...
Thanks very much ! The tuning is bad on both VCO1 and VCO2 of that oscillator (although it seems more extreme on VCO2). I uploaded the schematics diagram for...
Thanks for reply, I fixed the battery problem as described. I checked (again) all connections/signals with an oscilloscoop. I don't see any output, also no...
Hi, The caps are Cx10 ... where x is the voice number. On the schematics only voice #7 is drawn in detail, so you can see C710. Maybe it is not the cap but the...
Thanks ! The Cx10 and Rx39 have been already replaced to no avail. By IC8 are you refering to ICx08 ? it's a 4558 opamp. btw, I now see that I had to replace...
This might sound trivial but is your power supply output all in check. In addition have you checked the the solder pads on the power connectors. I had and...
If you already replaced Rx39/Cx10 then the only thing in common for both VCOs in one voice is ICx11 (TL072). THe value of Rx39 is not very critical unless it...
Thanks, I'll try that ... _________________________________________________________________ Is your PC infected? Get a FREE online computer virus scan from...
Hello, Still no sound, every chip has his power, setup from tape seems to work correctly (bank 1..8 lit up) so I think the problem is somewher on KLM366 (new...
You know what ?... now I relaize I replaced IC8 and ICx11 as well ! What if the problem is related with only one of the VCOs...? lets say VCO1. What would you...
1) If you experience that one voice has this problem, and within this one voice it is both VCOs then it is very likely that the reason lies in a component or...
If it is only one VCO, then things are different. It may be the cap (C709), which I do not believe because it is a polypropylene type, which have very good...
replace them again? Sometimes (and it will always bite you) you put in a bunk part as a replacement.. then you spend all week looking for something else,...
Thanks guys ! There was something strange going on.... After writing my previous mail I ran over a few components with a "freeze" spray, among them the...
ooops... the multileg component is IC6, not R40 ... machine ... gap ... tuning ... looking ... tune ... common ... Rx39 ... nominal ... it ... the ... the ... ...
The "multileg component" probably is the dual transistor for the antilog amplifier. This is one of the most critical stages in terms of note frequency. It...
Now I see what happened... I guess that was a big mistake using the freeze spray on such a sensitive circuit. The problem is that I already even readjusted...
Now I got the feeling the the multitransistor has gone defected... I let the machine work all night long, and when I check it out the dualtransistor is not hot...
Hello, Every suggestion from everyone given to me (thanks) I have tried but still no sound. The problem seems to be in the 8048 processor on KLM367. The ...
I think it is a standard part for simple diy circuits, the ones students usually build. You should be able to find it at a local electronics shop I think ... ...
Hi, I do not want to discouorage you, but I do not believe that it is the KLM-367's CPU. This does only the programmer. You can check it very easily: 1) If...
Hi, Great!! That's good information, I'll do the tests with my scope and let you know, thanks, Han. ... 20msec. ... of ... you see ... (green ... contacts ... ...
Hello all; I bought a polysix in rather bad condition... I did the batteryreplacements and checked to circuits...they seem to be OK for both sides of teh PCB ...
Are you refering to the trimpot on the computer board ? I don't know very much about it but on my Trident it did the same when I set it to a cetrain position....
Having problems with message search?
Fill out this form to ensure your group is one of the first to be migrated to the new message search system.
