Re: [PolySix] Re: Issue with patch Led's and Bank Led's after replacing buttons
2015-01-20 by Bob Grieb
Hi, Easiest is to simply make the measurements and post the results to this group. We can sort it out. Resistance measurements are not
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Re: Issue with patch Led's and Bank Led's after replacing buttons
2015-01-20 by yanbu@comcast.net
Thanks for that info Bob - I do not have an oscilloscope, not sure I know anyone out here that could check that. When you say to check the resistance from pin
Re: [PolySix] Issue with patch Led's and Bank Led's after replacing buttons
2015-01-16 by Bob Grieb
A short to +5V on D0 would cause Bank A LED to be turned on whenever IC2 on KLM371 is written to. It would also cause Program1 LED to be turned on whenever
Issue with patch Led's and Bank Led's after replacing buttons
2015-01-16 by yanbu@comcast.net
Hello, I just soldered on new buttons for patch select buttons 2 and 4, and the Poly button since they were not responding on my Polysix. This was an easy
Voice board wanted
2015-01-14 by klosmon
If anyone on the list has a spare WORKING voice board, I d like to purchase it. Don t need any of the socketed ICs, just the board. If you have one for sale,
Re: [PolySix] Osc Temperature Sensistivity
2015-01-12 by Bob Grieb
The PolySix writes out S&H voltages to the six voices in sequence.0-5 channels are the six voices, and 6 and 7 of the 4051 mux are used for anti-log
Osc Temperature Sensistivity
2015-01-11 by klosmon
I ve come across several P6 voice boards that have one oscillator (usually the first) that lags behind the others in coming into tune -- sometimes taking up to
Re: [PolySix] Re: Non-working attenuator
2015-01-04 by Bob Grieb
Glad you got it going. From: tuk88@rocketmail.com [PolySix] To: PolySix@yahoogroups.com Sent: Sunday, January 4, 2015 9:05 AM
Re: [PolySix] Re: Non-working attenuator
2015-01-04 by tuk88@rocketmail.com
Hey everyone ! Everything works fine. It was due to a broken trace on the PCB ( I think I broke it when I solder the PCB) Thank you a lot for you help ! :)
Re: [PolySix] Re: Non-working attenuator
2015-01-03 by tuk88@rocketmail.com
Sorry, it was of pin 2 which I was talking about. I just find the problem. There is a broken trace on the PCB. I ll make a bridge and I think everything will
Re: [PolySix] Re: Non-working attenuator
2015-01-03 by <backshall1@bellsouth.net>
Like Bob said, the point between R41-D2 connects to IC5 pin 2 not pin 3. Pin 3 is Tape Enable (inverted). IC 5 pin 2 should be about 1.1V unless the zener D2
Re: [PolySix] Re: Non-working attenuator
2015-01-02 by Bob Grieb
Do you mean pin 2? It doesn t hook to pin 3. What do you measure for voltage at the jcn of R41 D2 to ground? Is D2 a zener diode? If so what part
Re: [PolySix] Re: Non-working attenuator
2015-01-02 by tuk88@rocketmail.com
Hey Bob, I ve got thee two measurements, and they are OK. But it seems like the point R41 - D2 doesn t reach directly IC5 (measurement show a resistance of ~5k
Re: [PolySix] Re: Non-working attenuator
2015-01-02 by Bob Grieb
The layouts are available on the web. You should be able to see what s happening with just a voltmeter. With a 3.9V zener and 120 ohm to ground, you should
Re: [PolySix] Re: Non-working attenuator
2015-01-02 by tuk88@rocketmail.com
I ve got 3.35 V on pin 2 and 5V on pin 3. Normally, that works fine. But at the output, 0V. So I think that the LM393 is brown. Howether, I m looking for this
Re: [PolySix] Re: Non-working attenuator
2015-01-02 by Bob Grieb
If you look at the circuit, you can see that the reset adjustment onlyaffects the other half of the comparator. It should not affect pins 1,2,3 Looks like
Re: [PolySix] Re: Non-working attenuator
2015-01-02 by Bob Grieb
What voltages are on the two comparator inputs in normal operating mode? The plus input should be more positive than the minus input to turn off the output
Re: [PolySix] Re: Non-working attenuator
2015-01-02 by tuk88@rocketmail.com
I confirm that the problem come from the IC5. I disconnect the output 1 and everything works fine. I will adjust the reset circuit and try again. If it doesn t
Re: [PolySix] Re: Non-working attenuator
2014-12-31 by Bob Grieb
On the klm 367 board, there is a comparator output hooked into The resistors driven by u35 outputs. I think this comparator Will short the control voltage to
Re: Non-working attenuator
2014-12-31 by tuk88@rocketmail.com
Hey Bob, I already change the capacitor on the base, but no change on the attenuator... What are you talking about the reset circuit ?
Re: [PolySix] Re: Non-working attenuator
2014-12-31 by Bob Grieb
I see a capacitor from the base of one transistor in the dual fed by p vol. If that was shorted, it could stop the p vol from working. Also check the
Re: [PolySix] Re: Non-working attenuator
2014-12-31 by tuk88@rocketmail.com
Thank you Malte, I checked the cable they are OK. I test the continuity between the KLM368 and the KLM367, it s OK. I will focus at first on the transistor Q24
Re: polysix still no sound
2014-12-30 by nmr2@rocketmail.com
It difficult to know where in the audio path is the culprit. Simple Circuit Debugging http://www.diystompboxes.com/pedals/debug.html
[PolySix] Re: Non-working attenuator
2014-12-30 by Malte Rogacki
VCA Mod is the LFO signal if the switch in the LFO section is in the VCA position. You might also want to check the cable itself. Sometimes the battery acid
Re: Non-working attenuator
2014-12-30 by tuk88@rocketmail.com
Thank you both, for these answers. I test at the output of the IC35, I ve got the counting as at the panel board. I check the voltage at the output, and I ve
Re: [PolySix] Korg Polysix, serial numbers and total production and sizes
2014-12-29 by <backshall1@bellsouth.net>
There is only one size. The difference in size in that picture is just a trick of perspective. I have only seen serial numbers between 382198 and 465746 and
Korg Polysix, serial numbers and total production and sizes
2014-12-29 by stalinjohansen@yahoo.com
Does anyone know.. What was the first Korg Polysix serial number? (Did it start at 38 000?) What was the last Korg Polysix serial number? What was the last
Re: Polysix 100/120V to 220/240V conversion - Swapping transformer?
2014-12-29 by stalinjohansen@yahoo.com
To Malte and Johannes, thanks. About potential damage to internal components because of long term excessive voltage: Anything I should check/inspect closer,
Re: [PolySix] Re: Polysix 100/120V to 220/240V conversion - Swapping transformer?
2014-12-29 by Johannes Hausensteiner
... This is indeed quite high (+27%) ... Since it is a simple AC transformer it will transfer the primary voltage faithfully to the secondary side. This means
Re: [PolySix] Non-working attenuator
2014-12-29 by Malte Rogacki
To add to what Bob has been saying: The attenuator does not affects KLM366 (the voice board), it affects KLM368 (the effects board). The signal is called
Re: [PolySix] Polysix sounds off
2014-12-29 by Malte Rogacki
I ll do a more detailed comparison later. The general characteristics of the sounds seemed to be ok, though. I don t know why the brass sound had such long
[PolySix] Re: Polysix 100/120V to 220/240V conversion - Swapping transformer?
2014-12-29 by Malte Rogacki
Hello, the first thing you should look at is the internal transformer and the small PCB next to it. If the service manual is to be believed there are different
Re: Polysix 100/120V to 220/240V conversion - Swapping transformer?
2014-12-29 by stalinjohansen@yahoo.com
Measured the AC-voltage coming out from the step-down converter, and it s 127V! (126.8V) That s no good. Could someone please list the effects on a Polysix (or
Polysix sounds off
2014-12-28 by Sava66
Hello group, I am new here. I traveled to Tokyo recently and got my dream instrument, a nice-looking Polysix. I demoed it in the store and all the keys and
Re: [PolySix] Re: Tuning issue.
2014-12-28 by jw_dewdney@yahoo.com
THIS should give some really interesting context to the question of trace damage with acid. It s actually quite surprising just how MUCH the cross sectional
Re: Tuning issue.
2014-12-27 by pasitive@gmail.com
The real problem was bad trace on KLM-366, -15V trace near connector from PSU. It s now with original optocoupler and original resistor. No problems anymore.
Re: [PolySix] Re: Tuning issue.
2014-12-27 by <backshall1@bellsouth.net>
I believe he said the real problem was some acid trace damage on the 366 board, and it is working fine now with the original photocoupler and resistor. He
Re: Tuning issue.
2014-12-26 by andrijapusic@yahoo.com
Can you explain, what is your final solution? Which optocoupler and which resistor?
Re: Grounding noise from main output when cable-jack is connected
2014-12-26 by Stalin Johansen
Maybe the discoloration seen in the last photo is caused by overheating of the grounding-metal, rather than oxidization? If so, what could be causing this, and
Grounding noise from main output when cable-jack is connected
2014-12-26 by stalinjohansen@yahoo.com
Hi. Just bought a Japanese import Polysix. All outs and ins work fine except from the main output. When connecting a cable-jack into the main output there s a
Polysix 100/120V to 220/240V conversion - Swapping transformer?
2014-12-25 by stalinjohansen@yahoo.com
Hi. Got a Japanese 100V Polysix. I live in Europe where there s 220V. Is it enough to change the current 100/120V transformer in the Polysix to this one, a
Re: [PolySix] Non-working attenuator
2014-12-23 by Bob Grieb
Hi, I think we have been looking in the wrong place. Probably the switch and sensing of it are fine. As you mentioned, we should focus on IC35
Re: [PolySix] Non-working attenuator
2014-12-23 by tuk88@rocketmail.com
Thank you for your answer Bob ! When I say attenuator doesn t work, that means that turning the knob has no effects on sound (no increasing or decreasing
Re: [PolySix] Non-working attenuator
2014-12-23 by Bob Grieb
There is another switch that is also driven by P10 etc. does That one work correctly? If so, then the problem should be with D3. You can unplug the connector
Non-working attenuator
2014-12-23 by tuk88@rocketmail.com
Hi everyone, at first thank you for all these topics and knowledge which are very important for every polysix user (and repairer). With all these messages, the
Re: [PolySix] Tuning issue.
2014-12-21 by pasitive@gmail.com
VTL5C9, didn t change resistors.
Re: [PolySix] Tuning issue.
2014-12-21 by <backshall1@bellsouth.net>
What part was it that you used to replace PC-1, and did you change any resistors when you tried it? Don B. From: mailto:PolySix@yahoogroups.com Sent: Sunday,
Re: [PolySix] Tuning issue.
2014-12-21 by pasitive@gmail.com
Back to original photocoupler. All works now perfectly.
Re: [PolySix] Tuning issue.
2014-12-21 by pasitive@gmail.com
Actually it s fixed now. There was acid-trace in KLM-366B. It s is now in tune, but there s something that causes slight but very audible fast modulation in
Re: [PolySix] Tuning issue.
2014-12-21 by Bob Grieb
How about IC18 and Q3? Are they OK? Also, there is a 4051 (IC31) in that feedback loop. Maybe it s gonebad? Bob From: pasitive@gmail.com