Re: [PolySix] Re: Re-capping
2019-03-06 by Steph
Many thanks, my P6 is noisy, some sticky buttons and needs a damn good clean. But other than that is working fine. I’m fortunate to have someone local who is
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Re: p6 power supply transformer
2019-03-06 by t_tangent2003@yahoo.co.uk
I came across this post when looking for some info after my Polysix suddenly failed to power up after I accidently replaced an IC the wrong way round...Oops.
Re: Re-capping
2019-03-05 by t_tangent2003@yahoo.co.uk
Sounds like you have a lot planned for your Polysix Strph. I am sure it will look great when you are done. I forgot to say I agree with Jonathon that Robert
Re: [PolySix] Re: Re-capping
2019-03-05 by Steph
Thanks Jonathan, I have a set of new tac switches ready, the black plastic cradles that hold the buttons are proving very illusive, and feel sure I’m going
Re: Re-capping
2019-03-04 by t_tangent2003@yahoo.co.uk
Yes the Panorama mod looks very interesting, and the demos sound fantastic. Have a listen to them here, the review is in German, but look down the page for the
RE: [PolySix] Re-capping
2019-03-04 by Jonathan Williams
Both mine were completely stripped ‘to the bone’! All tact switches replaced regardless, Tubbutec’s ModyPoly installed and both now have a gorgeous
Re: [PolySix] starts up / no sound / all lights lit
2019-03-04 by Bob Grieb
ARP, POLY, UNI, CHORD, and HOLD are all driven by the key assigner CPU via 4174 chip IC2 on the KLM-366 board. Is the key assigner CPU working at all? Do
starts up / no sound / all lights lit
2019-03-04 by poly_sixteen@yahoo.com
is there some special tip what to do, press, pull, cut if the polysix starts up with all lights lit, like this ?
Re: [PolySix] Re-capping
2019-03-01 by Steph
Thanks Jonathan, good to know the audio noise is not related to the caps, many thanks. I’m planning on doing a strip down, clean and fitting a new wooden
RE: [PolySix] Re-capping
2019-03-01 by Jonathan Williams
Hi Steph, I have done a full sweep on both of my PolySixs. I do have a Hakko desoldering tool which makes it an absolute breeze but I totally concur with the
Re: [PolySix] Re-capping
2019-02-28 by Steph
Thanks, I do have a de-soldering device, but it’s not very sophisticated. If I was to have it done, I would probably take it to someone more qualified with
Re: [PolySix] Re-capping
2019-02-28 by Chromatest J. Pantsmaker
At this point, the circuit boards in old synths are getting pretty fragile. When you go about shotgunning the capacitors, you re likely to start lifting and
Re: [PolySix] Re-capping
2019-02-28 by Steph
That’s very helpful Anwander, thank you very much. I will resist the urge to purge :-) Sent from my iPhone ... That’s very helpful Anwander, thank you very
Re: [PolySix] Re-capping
2019-02-28 by Florian Anwander
PS: sorry for all the typos. Am 28.02.19 um 23:06 schrieb Florian Anwander fanwander@mnet-online.de ... ;)
Re: [PolySix] Re: PolySix MG Issue
2019-02-28 by cwc@dircon.co.uk
Hi Don, The synth behaves the way you describe. You put it much better than I ever could! All good. Many thanks :)
Re: [PolySix] Re-capping
2019-02-28 by Florian Anwander
Hi Steph You may replace electrolytic capactitors and tantalum capacitors which are between supply voltages and ground. Especially the electrolytics in the
Re-capping
2019-02-28 by Steph
Hi all, I have a PolySix with the usual upgrades, new battery, power supply and midi tubbutec installed. I’ve seen a few vintage repair videos on you tube
Re: [PolySix] Re: PolySix MG Issue
2019-02-28 by <backshall1@bellsouth.net>
It sounds like you are altering the filter with the ADSR, while the gate controls just the volume. If VCF EG Intensity is set to zero, and VCA Mode is set to
Re: PolySix MG Issue
2019-02-28 by cwc@dircon.co.uk
Hi all. Recent death in the family, hence no updates for a while. It certainly puts life and hobbies into perspective. Enjoy it while you can, I say. Anyway, I
Re: PolySix MG Issue
2019-02-06 by cwc@dircon.co.uk
Hi Rae & Johannes, You are definitely on to something. I can see from monitoring the power supply voltages that the modulation symptoms occur while the
Calibration - cannot set Cutoff to read 0V
2019-02-04 by josh.nursing@gmail.com
Armed with a couple of scopes, I thought I d have a go at doing a complete adjustment procedure which was impossible before. However, I hit a snag in Section
Re: [PolySix] Re: PolySix MG Issue
2019-01-27 by RAE LOCKARD
You may have a failing 10uf cap on one of your other boards, pulling the supply down on startup(?). I had a Poly61 and a CX3 with leaky shorted 10uf caps, easy
Re: PolySix MG Issue
2019-01-27 by cwc@dircon.co.uk
HI Johannes, Thanks for your response. I have replaced all the electrolytic capacitors on the power supply including the two large 4700uf and 2200uf ones.
Re: [PolySix] PolySix MG Issue
2019-01-26 by Johannes Hausensteiner
I suspect the power supply. You may want to check it with DVM and oscilloscope during the warm-up phase. Or you just replace the electrolytics in the P/S
PolySix MG Issue
2019-01-21 by cwc@dircon.co.uk
After many weeks refurbishing my new old PolySix I am very nearly there! I have one last issue before the final tune up and I wondered if anyone had any
Polysix Tuning Issue
2018-10-29 by Sibille Sigsen
Hello everybody, I have a tuning issue with my polysix. The opto isolator does not seem to be the problem. But I am not sure. I measured about -3V at pin 7 of
HALF D/A adjustment on KLM367 clone.
2018-09-28 by golbicali@yahoo.com
Open a new topic in order to not confuse readers: I was not able to process correctly the D/A adjustment after a short on pin 1 and 2 of the IC33 DAC. VR6 and
Re: KLM-367 Clone D/A Adjustment impossible
2018-09-27 by golbicali@yahoo.com
Thanks to Bob in the other topic I ve opened ( MG adjustment on KLM-367a Clone topic ) In fact I ve discovered that the D/A has not been done well. All the
Re: [PolySix] Re: MG adjustment on KLM-367a Clone
2018-09-26 by Bob Grieb
Clearly there is a problem with some other part of the MG circuit if you have increased R52 from 150 to 12K and the max frequency is still 1/6 of what it
Re: MG adjustment on KLM-367a Clone
2018-09-26 by golbicali@yahoo.com
On the KLM-367a clone board the MG Vpp adjustment has been now successful. (problem was with R56 that was 0,125W in staid of 0,250W ) But the MG frequency
MG adjustment on KLM-367a Clone
2018-09-20 by golbicali@yahoo.com
After a problem with D/A adjustment now solved i come with a new problem: When doing MG adjustment A)i m not able to get a larger vpp than 0,780v. B)and in the
Re: [PolySix] Re: KLM-367 Clone D/A Adjustment impossible
2018-09-20 by golbicali@yahoo.com
Thanks a lot you ve helped me. By comparing the DAC section of the clone boards with the original boards ( by luck i have a few old boards and a few clone
Re: [PolySix] Re: KLM-367 Clone D/A Adjustment impossible
2018-09-18 by Bob Grieb
If you have an oscilloscope, monitor pins 1, 2 and 3 of IC6 when calibrating the DAC Show us the waveforms. This is the comparator that compares the DAC
Re: [PolySix] Re: KLM-367 Clone D/A Adjustment impossible
2018-09-17 by Jed Jorgensen
You may have a bad solder joint somewhere. I remember on one of the prototype boards I was having all kinds of problems. Turned out a little blob of solder was
Re: KLM-367 Clone D/A Adjustment impossible
2018-09-17 by golbicali@yahoo.com
Thank you Bob. I attentivlaly read your code comments, but unfortunately it do not help me to find the fault. When i m trying to process D/A adjustment it is
Re: [PolySix] Re: KLM-367 Clone D/A Adjustment impossible
2018-09-17 by Bob Grieb
I uploaded a commented copy of the MCU code to the files section. The calibration code is at the end of the program IIRC. If you really want to understand
Re: [PolySix] Re: KLM-367 Clone D/A Adjustment impossible
2018-09-17 by golbicali@yahoo.com
I did it ( original 22uf value with ground mod ) , and unfortunately results are the same. This fault is hard to find. If nobody has the solution or other idea
Re: [PolySix] Re: KLM-367 Clone D/A Adjustment impossible
2018-09-15 by <backshall1@bellsouth.net>
Back before we knew the ground was missing between C22 and C23, the workaround was to use 10pf for C23 instead of 22pf. With the correct ground connection, C23
Re: KLM-367 Clone D/A Adjustment impossible
2018-09-14 by golbicali@yahoo.com
I ve replaced the IC27 ( TL072 ) by the original ( 4560 ). Problem is still the same. I ve replaced the X1 Clock by the original clock, problem is still the
Re: [PolySix] KLM-367 Clone D/A Adjustment impossible
2018-09-14 by golbicali@yahoo.com
Thanks a lot for the help. -I have double checked, the C23 C22 ground mod has been done -I have triple checked to set Manual and normal settings C23 is
Re: [PolySix] KLM-367 Clone D/A Adjustment impossible
2018-09-13 by <backshall1@bellsouth.net>
I think I saw this a couple of times about 5 or 6 years ago. One time I forgot to add the missing ground wire between C22 and C23 so there was a clock
KLM-367 Clone D/A Adjustment impossible
2018-09-13 by golbicali@yahoo.com
Hi, i ve just completed a Klm-367 clone board ( from https://sites.google.com/site/jedjorgensen/ https://sites.google.com/site/jedjorgensen/ ) I m not able to
Re: [PolySix] Polysix frying mixer channels
2018-09-03 by Ben Stuyts
This just means that the leakage is not big enough to trip your RCD. So maybe the leakage is low enough that it is not a lethal hazard. Rmember, these are old
Re: [PolySix] Polysix frying mixer channels
2018-09-01 by simon
No. the source of the leakage is within your polysix, the ground wire merely drains it away (to where ?) ... -- Met vriendelijke Groet, Simon Claessen
Re: [PolySix] Polysix frying mixer channels
2018-08-31 by Peter Foley
With the grounded cable, I’m not measuring any AC anymore. Would this mean it could be an issue in my mains? My house was built about a hundred years ago...
Re: [PolySix] Polysix frying mixer channels
2018-08-31 by Ben Stuyts
Peter, this solves the grounding problem. But not the leakage which should not happen. (At least, not in that amount.) There is still a problem lurking inside
Re: [PolySix] Polysix frying mixer channels
2018-08-31 by Malte Rogacki
The European models of the Polysix all had pre-installed 3-wire power cords. The service manual also gives only schematics for two different 3-wire setups. But
Re: [PolySix] Polysix frying mixer channels
2018-08-31 by Peter Foley
Putting a grounded power cable in the synth did the trick!
Re: [PolySix] Polysix frying mixer channels
2018-08-31 by <backshall1@bellsouth.net>
The original power cord on the Polysix is only 2-wire. Has this been modified to use a 3-wire power cord or is everything original as far as you know? Maybe a
Re: [PolySix] Polysix frying mixer channels
2018-08-31 by Malte Rogacki
One possible suspect could be the spark killer. If I remember correctly this was also a problem with some Akai devices? And yes, please be very careful. In