Re: [PolySix] Trying to Restore a P6.
2016-08-17 by Bob Grieb
Welcome. In manual mode, the voltage at each output of the two 4051 s 18 and 19 should be adjustable by changing the pot on the front panel that corresponds
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Trying to Restore a P6.
2016-08-17 by Jim Wright
Hi, New member here who has been struggling for years to get a P6 working that was not stored well, and had the typical battery leakage. It s in good shape,
Re: [PolySix] a funny thing happened on the way to...
2016-08-08 by Bob Grieb
You didn t tell us if the synth basically works, except those two lights are stuck on, or the synth doesn t work at all, and just those lights are on no matter
Re: Adding weight to Polysix keys...
2016-08-06 by Tony McAdam
The Korg Symphonic Piano 80S uses a weighted version of the PolySix / MonoPoly etc keys...
Re: Adding weight to Polysix keys...
2016-08-05 by synthmans@gmail.com
Possibly use a lower temperature hot glue in those pockets, as long as it doesn t damage or distort the plastics. Otherwise, the properly weighted keys have a
Re: Adding weight to Polysix keys...
2016-08-05 by scott.hamblin@abbott.com
Here s a photo showing the original key and one filled with what looks like a type of plaster. Note the small square compartment they filled, maybe in some
a funny thing happened on the way to...
2016-08-05 by jw_dewdney@yahoo.com
I was trying to get my KLM366 board tuned up - and in the middle of everything I managed to blow up my power supply (KLM 376 IIRC) . A clean blowout of the
Re: Adding weight to Polysix keys...
2016-08-05 by jw_dewdney@yahoo.com
could be anything ... you are in a far better position to tell than we are. HOWEVER - it seems to me that getting a bunch of those little lead weights that
Adding weight to Polysix keys...
2016-08-01 by scott.hamblin@abbott.com
I repaired two intermittent keys on my P6 on the weekend using some used keys from a scrapped P61 keyboard. The used keys had been modified by filling the
Re: Polysix Modulation problem
2016-07-28 by jesusgallego@gmail.com
Ah, I found what the problem was. The tech who installed the Kiwisix inadvertently cut the trace from IC2 in KLM-369 at pin 7 that prevented -5v signal in the
Re: Polysix Modulation problem
2016-07-27 by jesusgallego@gmail.com
Sure, I ve commented the issue with Murray already but I d like to dig a little deeper and rule out other things before sending the board to Australia and
Re: [PolySix] Polysix Modulation problem
2016-07-27 by Florian Anwander
Hello I think you should ask this on the kiwitechnics maillist (I think you are subscribed there). Florian
Polysix Modulation problem
2016-07-27 by jesusgallego@gmail.com
Hi, I m trying to debug the last remaining problem in my Polysix refurb, it s regarding the LFO signal. The KLM-367 has been replaced with a Kiwisix board
Re: [PolySix] VCF RESONANCE ADJUSTMENT QUESTION [1 Attachment]
2016-07-16 by jw_dewdney@yahoo.com
OOPS! never mine... i was probing the wrong connector - things can look a bit different on the actual board vs the diagram... for some reason i was visually
Re: [PolySix] VCF RESONANCE ADJUSTMENT QUESTION [1 Attachment]
2016-07-16 by jw_dewdney@yahoo.com
did you see the graphic i posted - showing where i m monitoring from Bob...? just wondering if it s right..
Re: [PolySix] VCF RESONANCE ADJUSTMENT QUESTION [1 Attachment]
2016-07-16 by Bob Grieb
CN05-7 should change when you change the cutoff on the front panel. CN05-11 should change when you change the resonance on the front panel. One thing that got
Re: [PolySix] VCF RESONANCE ADJUSTMENT QUESTION
2016-07-16 by jw_dewdney@yahoo.com
weird...! I m getting NO CHANGE from adjusting the cutoff knob at all. I DO get change when rotating the RES knob (front panel) clockwise... the lowest value i
Re: [PolySix] VCF RESONANCE ADJUSTMENT QUESTION
2016-07-16 by jw_dewdney@yahoo.com
ok - thanks Bob - if it works for you then I m sure it will work for me....
Re: [PolySix] VCF RESONANCE ADJUSTMENT QUESTION
2016-07-15 by Bob Grieb
I think you set CN05-7 to 0V using the cutoff knob on the front panel. Someone wrote that as a comment on my copy of the serv man and I have done it that way.
VCF RESONANCE ADJUSTMENT QUESTION
2016-07-15 by jw_dewdney@yahoo.com
so... just going through a tune up (sounds better tuned already after doing the resonance offsets)... and am a bit confused about which trimmer to use. For
Re: [PolySix] Another P6 with all LED's lit....
2016-07-06 by jw_dewdney@yahoo.com
that sounds remarkably similar to the problems i was having a few months back! in my case there was at least one slightly out of spec resistor in a critical
Re: [PolySix] Another P6 with all LED's lit....
2016-07-06 by Bob Grieb
So far, the only signals we have seen that looked reasonable were ALE and the oscillator input. You have lots of signals that show very small wiggles that
Re: [PolySix] Another P6 with all LED's lit....
2016-07-06 by noddyspuncture@hotmail.com
Yes Bob, all those power pins to the 8048 are fine...! Although I am actually getting waveforms and activity around the 8048, it all seems to be in the
Re: [PolySix] Another P6 with all LED's lit....
2016-07-05 by Bob Grieb
If you want to mail me your 8048, I can test it in my P6. You would need to pry it out carefully, a little bit at a time, alternating between the two ends with
Re: [PolySix] Another P6 with all LED's lit....
2016-07-05 by Bob Grieb
Timebase is just another way to say horizontal time per division, which you are adjusting. BTW, your scope probably has an adjustment called trace
Re: [PolySix] Another P6 with all LED's lit....
2016-07-05 by noddyspuncture@hotmail.com
I made a typo Bob... that should be 4.67v and 4.72v (not 7.72v) on IC27 pin1...! Cheers, Tom ... Hi Bob, I made two more photos... of the DAC (IC27 pin1) and
Re: [PolySix] Another P6 with all LED's lit....
2016-07-05 by noddyspuncture@hotmail.com
Hi again Bob, I ve now also added three photos... Pin6 Int - with the scope at 2v div Also Pins21 & 24 (P20 & P23) both also at 2v/5uS divisions... DC trigger.
Re: [PolySix] Another P6 with all LED's lit....
2016-07-05 by noddyspuncture@hotmail.com
Hi Bob, I made two more photos... of the DAC (IC27 pin1) and the T0 at the same time. Dual trace, scope set to 2v and using DC trigger and tweaking the level
Re: [PolySix] Another P6 with all LED's lit....
2016-07-05 by Ben Stuyts
... Hi Bob and all, Let me know if posts go missing and I’ll have a look at it. Sometimes Yahoo is a bit slow. Ben (moderator)
Re: [PolySix] Another P6 with all LED's lit....
2016-07-04 by Bob Grieb
Yes, that should be a good ground. BTW, if I am interpreting the DAC pin 4 photo correctly, It certainly looks like some data is being written to it, which
Re: [PolySix] Another P6 with all LED's lit....
2016-07-04 by noddyspuncture@hotmail.com
Thanks for all the info Bob, I am using the big black wire coming from near the battery area for all my grounds, so I think that should be OK...? You ve
Re: [PolySix] Another P6 with all LED's lit....
2016-07-04 by Ingo Debus
... Surely it also has a switch to toggle between Normal and Auto trigger mode? On digital scope sometimes it’s hidden in a menu. Often you get better
Re: [PolySix] Another P6 with all LED's lit....
2016-07-04 by Bob Grieb
Hopefully my other post will show up here. I don t see it yet. One more comment. If you do manage to get a decent picture of the DAC voltage waveform, in
Re: [PolySix] Another P6 with all LED's lit....
2016-07-04 by Bob Grieb
ALE looks great. OK, the signal on pin 1 is 6 MHz, so it s probably simply capacitive coupling from the adjacent pin 2, which is the main oscillator signal. In
Re: [PolySix] Another P6 with all LED's lit....
2016-07-04 by noddyspuncture@hotmail.com
By the way Bob, The trigger options I have on my scope are AC/DC/HF/LF/Line I am trying them all each time I scope a pin and the only ones I see of any use are
Re: [PolySix] Another P6 with all LED's lit....
2016-07-04 by noddyspuncture@hotmail.com
Hi Bob, I uploaded a few photos of my oscilloscope shots into a folder called Tom s in the photos section here. I named them to include the time & volts
Re: [PolySix] Another P6 with all LED's lit....
2016-07-03 by Bob Grieb
In test mode, only one would be active, since both channels being measured are in the same chip. In normal mode, both signals would be toggling, as the CPU
Re: [PolySix] Another P6 with all LED's lit....
2016-07-03 by Bob Grieb
Sshhh! You will blow my cover! Glad it was helpful to you. Bob
Re: [PolySix] tuning instability?
2016-07-03 by Malte Rogacki
I changed to current limiting resistor from 470R to 2.2k. If I m not wrong this should result in less than 1.5mA current drawn by the LED. I m under the
Re: [PolySix] Another P6 with all LED's lit....
2016-07-03 by jw_dewdney@yahoo.com
HEY BOB - I didn t realize it was you who put up that Tauntek page... cool. Was very useful for my multitrak endeavours.
Re: [PolySix] Another P6 with all LED's lit....
2016-07-03 by noddyspuncture@hotmail.com
Thanks for the reply Bob, On pin 32 with the scope there is something but it looks like a small washed out or smudged waveform. By that I mean not a nice
Re: [PolySix] Another P6 with all LED's lit....
2016-07-03 by Bob Grieb
I would also check the INTb pin, pin 6 and see if it s sitting low. If you turn on the test switch, and then power cycle the synth, if the CPU is working it
Re: [PolySix] Another P6 with all LED's lit....
2016-07-03 by Bob Grieb
Concerning your sine wave question, you didn t tell me the DC level, and I don t know that the inputs to the comparator are doing, so it s hard to say what
Re: [PolySix] tuning instability?
2016-07-03 by Ingo Debus
... Did you just replace the LEDs or did you also change the series resistors? Just replacing the LEDs and leaving the series resistor as they were won’t
Re: [PolySix] Another P6 with all LED's lit....
2016-07-03 by noddyspuncture@hotmail.com
Yes Bob... pin 4 Reset is sitting high (according to my logic probe) and I also measure 4.85v on it ... I can do the procedure successfully - adding the 56K
Re: [PolySix] tuning instability?
2016-07-03 by Malte Rogacki
Next update: Recapped most of the power supply (except the two big ones) - no audible improvement. Removed a few LEDs from the programmer board (for example,
Re: [PolySix] Another P6 with all LED's lit....
2016-07-03 by Bob Grieb
Didn t you mention having an oscilloscope? If so, why would you use a logic probe? The scope gives you a lot more information if you know how to interpret
Re: [PolySix] Another P6 with all LED's lit....
2016-07-03 by noddyspuncture@hotmail.com
Many thanks for that Bob, So let me get this right - when turning front panel controls I should be seeing either 0v or 5v on T0 - pin1..? I am getting no
Re: [PolySix] Another P6 with all LED's lit....
2016-07-03 by Bob Grieb
Actually, I think essentially 0V at pins 14 and 15 of the DAC is correct. Pin 14 is a current input, not a voltage one. Pin 5 of the 4560 should be at 2.0
Re: [PolySix] Another P6 with all LED's lit....
2016-07-02 by noddyspuncture@hotmail.com
As I have checked and quadruple checked all tracks, traces and connections - and all are OK, I am assuming it s component failure..!? I had been suspecting the