Hi,

The 9V AC is used only for the filaments of the tubes and is not regulated.
So, it possible that you have a probleme with one of the display.
Disconnect the cable from the panel board to the display board and see
if the Matirx have a correct response with your action on the button. The LEDs
have to behave a usual.
In the same time, control the voltage of the CPU board (pin 7 of the 6809).
You must have 5V. If not, perhaps the PSU have problem!

Regards

Eric


--- En date de?: Mar 15.2.11, r_j_d_2.phila <r_j_d_2.phila@...> a ¨¦crit?:

De: r_j_d_2.phila <r_j_d_2.phila@...>
Objet: [xpantastic] Matrix 12 not booting up
?: xpantastic@...
Date: Mardi 15 f¨¦vrier 2011, 21h03

Hi all, im hoping someone might have some ideas/leads for me. upon turning on, my M12 is not producing sound, most red LED's are solid on, and the displays are blank. if i hold the "clear" button while turning on, the "RESET" option flashes for just a split second, then disappears.

i have checked the PSU voltages, and everything is within the specs of the service manual EXCEPT:

9vac reads about 6.5vac
55vdc reads about 60.2vdc

any ideas? are those within normal specs you think, or do i need to be concerned with that discrepancy? thanks for the help!!!



------------------------------------

Yahoo! Groups Links

De: r_j_d_2.phila
Objet: [xpantastic] Matrix 12 not booting up
?: xpantastic@...
Date: Mardi 15 f¨¦vrier 2011, 21h03

Hi all, im hoping someone might have some ideas/leads for me. upon turning on, my M12 is not producing sound, most red LED's are solid on, and the displays are blank. if i hold the "clear" button while turning on, the "RESET" option flashes for just a split second, then disappears.

i have checked the PSU voltages, and everything is within the specs of the service manual EXCEPT:

9vac reads about 6.5vac
55vdc reads about 60.2vdc

any ideas? are those within normal specs you think, or do i need to be concerned with that discrepancy? thanks for the help!!!



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Rejoice! Rejoice! Rejoice!

I have found an extremely suitable encoder for replacing cranky/dead ones on
the Xpander. They are relatively new from Bourns. The part number you want
is PEC09-2325K-N0015. Digikey and Mouser have them. They are 30 detent, 30
pulses per rotation. Rather than D shafts they have the old style knurled
round shaft. The locking collets fit perfectly. Unlike most encoders,
these have a nice strong detent - not as heavy as the Xpander but solid and
obvious. They work a peach. The best part is they are around $2.30 in
quantity 1. Buy enough for 3 spare sets and you are set for life. There
are a couple of drawbacks, none of them major or deal breakers.

First, the encoder shaft is long. The part comes with shorter shafts but I
can't find anyone stocking them. I used a couple of washers on the bottom
side of the encoder to shim it away from the PCB to the correct height.

Secondly, they are small in diameter so you will need to hold them while you
tighten them in place to keep them centered. You could make some kind of a
spacer but I didn't bother.

Thirdly, the encoders are only available with the through hole connection
and not solder lugs so you have a little delicate soldering to do.

Forth, the housing has a positioning tab you will need to cut off with a
pair of snips so it sits flat on the PCB.

Lastly, the housing is much smaller than the original encoders so will
either need to solder on extensions to the existing connections or just
replace them with new longer wire. Which is the correct way to go about it.


James R. Coplin

Hi James,

That is indeed excellent news. Thanks for the detailed write-up. I happen to
have an incomplete Mouser order open in my browser, so I have chucked a
dozen of your encoders in there as well.

Cheers,

John :^P
--
John Pallister
john@...
john@...

Please, you can contact Doug directly in his email address. But, be aware that a CEM3374 is one of the most rare vintage synth chips! Therefore, you should buy them as many as you can afford or is available. I would take a pair as a minimum. But, in any case, you just need to change that chip, which is not working. Take all the precautions against the static electricity, which can break this and many other ships, if you are careless. Have you also tried to push the chips back to their places? They have the tendency to come up after many years of use. Or, remove the assumably problematic chip and then push it carefully and tightly back to its place. This could well be enough to fix the problem. An other as important work is to replace all condensators, which tend to dry during the years. This is very typically done also just as a precaution.

Good luck!


--- In xpantastic@..., serra peggy <serrapeggy@> wrote:

Hello!
Excuse my bad english i'm french.
I've got an xpander witch 3374 of voice N?¡ã6 needs to get replace cos tuning
fails...
all 3372 have already been replaced.
I think for a better result i should replace the all 6 3374 don't you think.
How much would it be for 6 of them plus shipping to France?
Would you accept Paypal transfer?

Thank you very much for reading me.
I hope to get good news from you soon.
Bye
Peggy & Franck






________________________________
De : synthparts <synthparts@>
?€ : xpantastic@...
Envoy?? le : Sam 4 septembre 2010, 1h 39min 03s
Objet : [xpantastic] CEM3374 VCO and CEM3372 VCF/VCA chips available


Hi, I have a few CEM3374s and CEM3372s for your Xpander/Matrix-12 in stock now.
All chips are tested and guaranteed working.

Thanks,
Doug
synthparts.com

1) The easy way: Use Pedal 1 or 2 as modulation sources:
Go to Master Page/Midi/Ctrl and assign a control change number to Pedal 1 or Pedal 2.
In your tone, set Pedal 1 or 2 as modulation source of your parameter.
The bad news is that you'll have to set the modulation sources for each of your single patch.

2) The "geeky" way: Transform Control Changes messages to SysEx and send them to Xpander:
On the Xpander, to change a parameter in SysEx, you first need to send a page select, and then a parameter change:
ex:
page select: F0 10 02 0B 20 00 F7 (VCO1, subpage 0)
param change: F0 10 02 0A 00 08 00 00 00 63 00 F7 (bottom button...)

See the OberheimXpanderMidiSpec document in the file section of the group for details.
You don't need to resend a page select for the next param if it is still in the same page/subpage than the previous one.
Page/subpage select takes a lot of time to be taken in account by the Xpander.

So what you have to do is to have a software (Midi-OX, Bome's MIDI Translator) or device panel/mixermap(in Cubase for example)... on your PC that transforms a control change value into this kind of SysEx messages and send them to the Xpander.

The good news: Once you've setup this "CC# to SysEx" chain, it will work on every single patch without modifying them. You can even control parameters that have no free modulation sources.
The bad news: you have to read the Xpander MIDI spec and understand it before doing anything ;)

Hope this helps,
/Greg.


--- In xpantastic@..., "stardent2000" <nickw@> wrote:

Hello I'm new to the xpander (and synthesizers in general) and was wondering if someone could help with a little advice.

I have an evolution mks-149 that has lots of assignable knobs that i would like to map to various parameters in the xpander (i really dont like the encoders on the xpander, they take so many turns to get from 0 to 127, and I can hear them clicking loudly through my headphones as I tweak a sound). I am using cubase and it receives midi from the knobs as I turn them but then what? the xpander receives pitchbend and modulation from the wheels ok but how can I tell the xpander to take data from a knob and map that to the (say) resonance. Can somebody point me in the right direction on this?

I hope I'm not asking a dumb question but I find all this VERY confusing!
Thanks,
Nick

Hello I'm new to the xpander (and synthesizers in general) and was wondering if someone could help with a little advice.

I have an evolution mks-149 that has lots of assignable knobs that i would like to map to various parameters in the xpander (i really dont like the encoders on the xpander, they take so many turns to get from 0 to 127, and I can hear them clicking loudly through my headphones as I tweak a sound). I am using cubase and it receives midi from the knobs as I turn them but then what? the xpander receives pitchbend and modulation from the wheels ok but how can I tell the xpander to take data from a knob and map that to the (say) resonance. Can somebody point me in the right direction on this?

I hope I'm not asking a dumb question but I find all this VERY confusing!
Thanks,
Nick

From: envia94
Subject: [xpantastic] Re: Remote control of the xpander
To: xpantastic@...
Date: Saturday, October 16, 2010, 7:56 AM

?

Take a look at the Xpander MIDI Specs and Programming at


Maybe somebody could give you a more direct answer, but in general, it is also quite important to study a bit.

Tiitu

--- In xpantastic@..., "stardent2000" wrote:
>
> Hello I'm new to the xpander (and synthesizers in general) and was wondering if someone could help with a little advice.
>
> I have an evolution mks-149 that has lots of assignable knobs that i would like to map to various parameters in the xpander (i really dont like the encoders on the xpander, they take so many turns to get from 0 to 127, and I can hear them clicking loudly through my headphones as I tweak a sound). I am using cubase and it receives midi from the knobs as I turn them but then what? the xpander receives pitchbend and modulation from the wheels ok but how can I tell the xpander to take data from a knob and map that to the (say) resonance. Can somebody point me in the right direction on this?
>
> I hope I'm not asking a dumb question but I find all this VERY confusing!
> Thanks,
> Nick
>

Hello I'm new to the xpander (and synthesizers in general) and was wondering if someone could help with a little advice.

I have an evolution mks-149 that has lots of assignable knobs that i would like to map to various parameters in the xpander (i really dont like the encoders on the xpander, they take so many turns to get from 0 to 127, and I can hear them clicking loudly through my headphones as I tweak a sound). I am using cubase and it receives midi from the knobs as I turn them but then what? the xpander receives pitchbend and modulation from the wheels ok but how can I tell the xpander to take data from a knob and map that to the (say) resonance. Can somebody point me in the right direction on this?

I hope I'm not asking a dumb question but I find all this VERY confusing!
Thanks,
Nick

?

wow, this is wierd. i JUST came here to ask the same thing. well, technically, on a matrix 12, but yea.....

so any ideas? i am told that the midiboard can be set up so that 16 midi channels can each control a voice....

--- In xpantastic@..., Wayne Griffin wrote:
>
> I should know this off the top of my head but anyways...
>
> How could we configure the Xpander to respond to polyphonic pressure signals
> from a Kurzweil Midiboard?
>
>
> thanks, [w]

I should know this off the top of my head but anyways...

How could we configure the Xpander to respond to polyphonic pressure signals
from a Kurzweil Midiboard?


thanks, [w]