so then to me it sounds like you might just have a bad strap?? :) try swapping the straps as well... -omar --- sent from iPhone On Jul 10, 2012, at 7:53 AM, Terje Winther <terje.winther@...> wrote: > Yes, that was my original idea as well. However, both voice cards get the same messages, so I do not know how to seperate the commands. Maybe the voice card IDs do this (the straps on the cards). > > > Terje > > > Den 10. juli. 2012 kl. 13.46 skrev Omar Torres: > >> >> >> no one is saying that moving the boards >> displaced the problem.You are misreading >> his results. Moving the boards resulted >> "slot" that handles voices 7-12, regardless >> of which board is connected to this second >> "slot" for voices 7-12. >> >> this is simple guys: if the problem always stays >> in the same "slot" (not the same board) >> then this means there is some "fixed" path >> that that the CPU or controller uses to get >> to these "slots", regardless of what board >> is in place. He already proved this by >> swapping the boards and the problem did >> not follow the board, it stayed in the same >> board "slot" >> >> You need to focus on finding this "fixed" path >> "slot" and thoroughly test that entire path from >> the CPU to the point where it communicates >> to the voiceboard connected to "slot 2" (voices 7-12) >> >> -omar >> >> --- >> sent from iPhone >> >> On Jul 9, 2012, at 5:00 PM, Christophe JANOT <cjanot@...> wrote: >> >>> >>> >>> So you swapped the connectors between the 2 voices boards. We are agree that it was the connectors at the upper right corner, right ? I ask because I don't understand how the swap displaced the problem since there is no tuning specific wires on the connectors. This is a classic CPU bus. >>> >>> Kris >>> >>> Envoyé de mon iPad >>> >>> Le 9 juil. 2012 à 18:19, Terje Winther <terje.winther@...> a écrit : >>> >>>> >>>> Very interesting update: >>>> >>>> The Matrix-12 is just two Xpander voice board on top of each other, right? So it should be OK to shift which one of the cards who is on top? >>>> Since I was always getting tuning errors on voice 7-12 while voice 1-6 was always right, I thought I could swap position of the voice cards to see what happens. >>>> And guess what: it is still voice 7-12 that gets the error - AFTER the swap. The card that was getting all the errors now works perfectly in tune. >>>> >>>> So my conclusion is this: >>>> - Both the voice cards now work as they should. >>>> - There is something wrong on the processor board (or in the connection between the cards: I can check the multicable). >>>> >>>> Since I am mostly an analog synth repair guy, I am getting towards my limits if I am about to debug the digital electronics. In my experience though, it is often some logic chips and/or some physical connection (on or off board) that fails. I really hope there is nothing wrong with the processor itself. >>>> It would be nice to get this M-12 completely fixed, as it looks good, and it is now so close, so close to being perfect. >>>> >>>> Terje >>>> >>>> >>>> >>>> >>>> >>>> Den 6. juli. 2012 kl. 20.42 skrev Karl Schmeer: >>>> >>>>> >>>>> >>>>> Hi Terje, >>>>> >>>>> Wow Two M12's :-) >>>>> >>>>> The version of the M12 service manual I have " Bought from Factory long ago" is >>>>> pretty thin on details. >>>>> >>>>> It's just schematics and a few engineering change orders. >>>>> If you have not done so check out the Xpander Service manual. It's in the files >>>>> section of this group. >>>>> The calibration procedures for the trimmers you speak of are in there, as well >>>>> as a detailed >>>>> >>>>> description of what really goes on during the auto tuning routine. >>>>> >>>>> You probably already checked these things but just to be sure: >>>>> Do the 2.2uF caps that were replaced have a 50VDC rating? If not they will not >>>>> pass the audio signal correctly. >>>>> >>>>> Actually "the entire board failing tune "points to a more systemic failure. >>>>> Both the VCO and VCF are tuned the same way with the exception that the VCF's >>>>> resonance >>>>> is set to oscillate. A specific voltage is applied to the individual VCO or >>>>> VCF >>>>> and the output frequency is monitored by the CPU to allow tuning. >>>>> >>>>> I would start at the DAC circuit ( page 19 xpander service) There is a trimmer >>>>> in that circuit for >>>>> >>>>> DAC offset calibration. ( The procedure is at the end of the Xpander service >>>>> manual page 34. >>>>> Maybe thats all that is wrong :-) >>>>> >>>>> If not : >>>>> There is also a procedure for checking the board reference voltage ( page 34) If >>>>> this voltage is off spec it could >>>>> cause errors. >>>>> Try swaping DAC's between the "known good board" and your failed one. Or any >>>>> other parts in the DAC circuit. >>>>> >>>>> There is a circuit on page 31 (Lower right hand corner in Xpander service) >>>>> Which is used in the auto tuning routine. It is built around an LM311 voltage >>>>> comparator >>>>> >>>>> which ties to the output of each voice. >>>>> Something may be amiss here. >>>>> >>>>> Report back after these checks and I will think about it some more. >>>>> >>>>> Best Luck >>>>> >>>>> Karl >>>>> >>>>> >>>>> ________________________________ >>>>> From: Terje Winther <terje.winther@wintherstormer.no> >>>>> To: xpantastic@yahoogroups.com >>>>> Sent: Fri, July 6, 2012 12:30:38 PM >>>>> Subject: [xpantastic] only one board active >>>>> >>>>> >>>>> Hi all, >>>>> Thanks a lot for all the help I have been given on this list. I have >>>>> changed parts in the power supply, some CEM chips, all those el.caps >>>>> who blocked tuning and sound, swapped some 74 series logic chips (so >>>>> now all encoders works), and got new switches and rubber feet, and >>>>> even a new key. And of course cleaned it up since all boards were out >>>>> anyway. >>>>> The Matrix-12 is almost all right now - it is just one peculiar error >>>>> left: >>>>> It seems that only one of the voice cards gets the proper commands. >>>>> Voice 7 - 12 fails tuning of VCOs and VCFs, but all other tuning >>>>> passes and there is sound from all 12 voices (if I turn them on) and >>>>> the voices are almost in tune, and VCFs seems to work like they should. >>>>> I also have another Matrix-12 in for service (yes, two M-12s in front >>>>> of me - pretty sight!), and it too reportedly have an issue with only >>>>> one of the voice cards working properly. >>>>> I have double-checked the connectors (the paralell connector and the >>>>> two 3-4 pin connectors) and they all seems to be fine. >>>>> Any tips on what to do if one of the voice cards don´t responds? >>>>> >>>>> On another question: While having all the boards out, I noticed that >>>>> there are very few manual trimmers on the M-12, but there are some, >>>>> and I can´t seem to find any info on how to calibrate them. I have the >>>>> service manual, and I find the trimmers there, so I can pretty much >>>>> guess what to do, but it would be nice to know for sure. >>>>> >>>>> Terje Winther >>>>> terje.winther@wintherstormer.no >>>>> http://www.wintherstormer.no/ >>>>> >>>> >>>> Terje Winther >>>> terje.winther@... >>>> http://www.wintherstormer.no/ >>>> >>>> >>>> >>>> >>>> >>> >> > > Terje Winther > terje.winther@... > http://www.wintherstormer.no/ > > > > >
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Re: [xpantastic] only one board active
2012-07-10 by Omar Torres