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Re: hello everyone, Xpander problem, help is needed...
Hi Bakis, mine had similiar issues which turned out to be to due to old
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capacitors... its been fine since it was recapped (around 3(ish) years ago) hi everyone, |
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hello everyone, Xpander problem, help is needed...
Bakis Sirros
hi everyone, new member here, my Name is Bakis. recently bought an Xpander and have the following problem: works and sounds great...? ...apart from voice 5,
which, after its shipping to me, does not pass the auto tune test.
?
sometimes the 'PW' section of it fails, sometimes the Res section
fails, sometimes all the sections of voice 5?fail (except the vca section of
voice 5 that never fails).
? even if i activate the problematic voice, after its
been automatically shut off by the Xpander OS, it sounds a bit different from the
others in filter tone and tuning (of course, as it cannot be tuned,) and
very very low in volume.
another weird thing i noticed: when i direct voice
5 in its 'direct' output 5, then, from this output, i can hear all of the
xpander voices (together with voice 5) but very low in volume.
all the other direct outputs work as they should,
for all the other voices.
?
i performed software reset, re-sitted all ribbon
cables and all of the chips in the voice 5 section of the xpander voiceboard
without success,
i also performed all the tests for the xpander
(memory, vmemory, etc...) and all are ok, afaik.
plus i re-sitted chip U106 which is responsible for
the panning output section of voice 5 (after studying the service
manual). also, i swapped both CEM3374 and CEM3372 of voice 5 with another working voice chips (voice 6) and
still the fault appears on voice 5. so, both the CEM chips are Not the
problem... and i swapped ALL of the chips of voice 5 with
the chips of voice 6 and still the same problem appears on voice 5.
so ALL the chips in the voice 5 section are ok for sure. and, after hitting tuning many many times and hitting tuning
while the machine was at various different presets, i noticed that thing:
when the machine was autotuning and it was in a preset
that was very complex with lots of modulations and vco modulation as well,
then?voice 5 failed in the vco tuning as well, (and, at one time, vco 1
failed!).
when the machine was autotuning, while it was in a simpler
sound preset (some brass or synthlead...), then?the voice 5 only failed in PWM
and maybe Res... but it passed vco tuning....!!
so maybe its a problem in another board of the machine
(like the CPU) and not in the voice 5 board ?
?
maybe this indicates that i should re-sit the chips in the
main CPU /memory board as well?? do you think i should take the time and re-sit
all the chips in the CPU board? would it make sense?
? (do you think a 'HARD Reset' may fix the problem? how do i do
this?) is there anything specific i should check?
everything seems connected.... i cannot resit ALL the chips in all boards
obviously... but maybe i should resit a specific chip from another section of
the xpander boards....? any ideas / help?
?
i really do not want to break anything inside the
Xpander (i do not want to use a soldering iron, after all, everything seems in
place), but i can remove and easily re-sit a specific chip or two, if needed of
course....
?
btw, the seller is very honest and he insisted that
the machine worked fine?(all 6 voices) before shipping, and i believe
him..
thanks for all your help in advance! best regards,????? :-) Bakis. Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist [Doepfer_a100] group owner www. parallel - worlds - music. com www. facebook. com/ pages/Parallel-Worlds/192093934136476 www. myspace. com/ parallelworldsmusic www. myspace. com/ interconnectedmusic www. myspace. com/ memorygeist
www. DiN. org. uk
www. musicamaximamagnetica. com
www. vu-us. com |
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Re: Those of you who replaced CEM 3372s how did you take them out ?
开云体育This is interesting,
?
I have a Prophet T8 where one of the voices have a
longer release-time. On certain patches, this is very noticeable.
?
Maybe I should check what 3372s are in
there.
?
WT
?
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Re: Those of you who replaced CEM 3372s how did you take them out ?
It's not just the Xpander/M-12. The Prophet-600 is pick about CEM3372s also. I have some of the older rev chips in stock.
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Doug synthparts.com --- In xpantastic@..., "ktfiz" <k.tomasson@...> wrote:
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Re: Those of you who replaced CEM 3372s how did you take them out ?
The newer rev D ICs from Technology Transport didn't work properly in my Xpander...
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A while back I had my Xpander serviced for one voice that would very faintly sustain indefinitely. It was not obvious on every patch, but on patches with longer release times if you cranked the volume there was a hanging note. Otherwise everything worked perfectly and it passed all tests. After swapping chips around, we finally the narrowed the problem down to the 3372 IC. It was a rev D 3372 I had recently replaced from Technology Transplant. I had purchased some more 3372's as back up from Technology Transplant so I brought them to the tech to try. We tried all eight 3372 ICs that I had and every one had the hanging note issue. My tech finally tried a 3372 that he had and it worked! It seems the Xpander is picky about it's 3372s. From my experience, the newer rev D ICs from Technology Transport didn't work properly in my Xpander. --- In xpantastic@..., "Tobbe" <tobbebergman@...> wrote:
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Those of you who replaced CEM 3372s how did you take them out ?
Tobbe
When I replaced my Eproms for Voice and Processor I used a PLCC Extractor like this:
will this work for pulling out the CEM 3372s as well ? I might buy a set of CEM 3372 Rev D from Chipforbrains on Ebay. Has anyone had a good experience with them ? |
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Upgrading from 1.0 eproms make strange sounds when tuning the VCF's
Tobbe Bergman
Hi all Oberheim Xpander users ! |
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Re: Intermittent Display on Matrix-12
Hello,
Every integrated circuit in the M12 is in a chip socket. It's quite possible one or several of the IC's have worked loose. Another possibility is that one or more of the ribbon cable connectors have come loose. If it were me, I would?first check?the ribbon cables.?If that does not give a positive result, I would?re-seat ( carefully remove and place back in the socket)? each?integrated circuit?on the?display board. Try these things, and see if that helps. Best Of Luck Karl ________________________________ From: joigaloid9 <joigaloid9@...> To: xpantastic@... Sent: Wed, October 12, 2011 9:43:19 PM Subject: [xpantastic] Intermittent Display on Matrix-12 ? Hello! Thank you for allowing me to join this group. I previously posted at the Oberheim group under a similar name. I am in the process of fixing up my Matrix-12, possibly for sale in a fewdisintegrated and left a residue over most of it, which I tried to clean up (more on that later). First off, let me say it is perfectly functional. All voices work, knobs and encoders are OK, LEDs are fine. It has the individual voice outputs and the pressure sensitivity mod both working fine. The one major fix needed is on the displays. There is one character on all three displays that is intermittent (it is the same character on all the displays). It will blink and go out without warning, but come back just fine some time (days even) later. I know of the Benden Tech replacement displays, but that seems a bit overkill for the problem I am having. I am not afraid to open it up and probe around with a voltmeter, and I have the schematics. Before I dive in there, has anyone else had this problem? Or can anyone suggest a troubleshooting approach, things to look for, etc? Thank you - j |
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Intermittent Display on Matrix-12
Hello! Thank you for allowing me to join this group. I previously posted at the Oberheim group under a similar name.
I am in the process of fixing up my Matrix-12, possibly for sale in a few months. It has a few cosmetic issues because the foam in the road case disintegrated and left a residue over most of it, which I tried to clean up (more on that later). First off, let me say it is perfectly functional. All voices work, knobs and encoders are OK, LEDs are fine. It has the individual voice outputs and the pressure sensitivity mod both working fine. The one major fix needed is on the displays. There is one character on all three displays that is intermittent (it is the same character on all the displays). It will blink and go out without warning, but come back just fine some time (days even) later. I know of the Benden Tech replacement displays, but that seems a bit overkill for the problem I am having. I am not afraid to open it up and probe around with a voltmeter, and I have the schematics. Before I dive in there, has anyone else had this problem? Or can anyone suggest a troubleshooting approach, things to look for, etc? Thank you - j |
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Re: encoders for the Japanese Matrix-12?
开云体育If you go to Digikey and look up the part number there is a technical drawing there that will give you dimensions etc.? Probably best to look there. ? James R. Coplin ? From: xpantastic@... [mailto:xpantastic@...] On Behalf Of envia94
Sent: Monday, August 08, 2011 12:28 PM To: xpantastic@... Subject: [xpantastic] Re: encoders for the Japanese Matrix-12? ? ? Hi James, |
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Re: encoders for the Japanese Matrix-12?
开云体育I’m not sure if I posted here but this year I finally found a suitable replacement for the encoders in Bourn’s encoders PEC09-2325K-N0015.? Digikey is the only place in the US I’ve found that stocks them.? I’m not sure what if any difference there is in the Japanese and American Xpanders as far as the encoders.? The Bourn’s are not an exact drop in replacement as they have a different physical footprint. ?I used some rubber washers to center them in the mounting hole and had to use some wire to extend from the solder lugs to reach the board.? Not a big deal at all – it took me less than an hour to replace all of the encoders on mine. ?They are also cheap.? I bought two full spare sets to have on hand for future repairs if needed. ? James R. Coplin ? From: xpantastic@... [mailto:xpantastic@...] On Behalf Of Haven Siguenza
Sent: Monday, August 08, 2011 11:29 AM To: xpantastic@... Subject: [xpantastic] encoders for the Japanese Matrix-12? ? ? Anyone know where/what equivalent encoders for the Japanese made Matrix-12 are available? ? I have a Japanese made Matrix-12 that has sat unused for almost a year. It is missing a single encoder and some buttons have failed. I managed to find some replacement buttons for the American M12 but they are slightly different from the Japanese version which means some wiring needs to be done. ? At this point if I can't find parts soon I will have to sell at a loss. Any help is appreciated. ? thanks, -haven |
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encoders for the Japanese Matrix-12?
Haven Siguenza
Anyone know where/what equivalent encoders for the Japanese made Matrix-12 are available? At this point if I can't find parts soon I will have to sell at a loss. Any help is appreciated. thanks, -haven |
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Original encoders for sale in Germany, 15.7.2011
I picked the following offer from thomann.de web page in German:
Step-Encoder für Xpander/Matrix-12 Sehr seltene originale Drehregler (Step-Encoder) für Xpander/Matrix-12. Stückpreis: 25,-. Seller: Wilhelm Horger, D-90571 Schwaig, 15.7.2011 Email: horger@... Cheeers, Tiitu. |
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Re: Why no Xpander mod. matrix implementation?
________________________________
From: Tony Cappellini <cappy2112@...> To: xpantastic@... Sent: Sat, August 6, 2011 10:10:51 AM Subject: Re: [xpantastic] Re: Why no Xpander mod. matrix implementation? ? AFAIK?it has never been tried before. I would want to take a long serious The Matrix 12 ROMS will try to find the 2nd voice board which the Xpander Good Point Tony. I was thinking,?you could just turn off the voices?7 - 12 in the master page. Your right,?it could never be that easy. Karl |
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Re: Why no Xpander mod. matrix implementation?
The Matrix 12 ROMS will try to find the 2nd voice board which the Xpander doesn't have. This *may* cause an error condition which keeps the CPU from completing
its initialization routine. |
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Re: Why no Xpander mod. matrix implementation?
Hi Matt,
The mod matrix page is accessed through the "Misc" page, correct? So the wouldn't be giving up any other buttons.Yep So the big question is: would the mod matrix become available if you used M12AFAIK?it has never been tried before. I would want to take a long serious look at the schematics and hardware for each synth before I would even try it. Best Karl? ________________________________ From: vrazomatt <vrazomatt@...> To: xpantastic@... Sent: Fri, August 5, 2011 10:17:15 AM Subject: [xpantastic] Re: Why no Xpander mod. matrix implementation? --- In xpantastic@..., Karl Schmeer <shire03@...> wrote:
of coppied ROMs from an M12 and put them into an Xpander.?? Giving the Xpander the Modulation list page. However since the M12 roms never supported? On th M12, the modulation??page gives you a list of all 20 modulation routings. unused ones when I need more for some reason.?? |
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