[sdiy] Looking for MATRIX 12 information

[Christophe Janot]

Unfortunately, I didn't saw any trace of the Matrix 12 Service Manual on the w3.
About the PSU, the service manual scan available on the net is not very readable. I suppose you have this one...
About the 1-6, 7-12 identification, I think you had just to unplug one of them. The auto-test function should help you to identify the missing one. Normally, the board identification is made with a strap near the U901 chip near the 40pins connector of the voice board. On board 1-6, the strap 'may' be connected to pin 6 of the connector. Board 7-12 'may' be connected to pin 5.

Regards,

Christophe

Le 30 mai 2012 à 23:35, John Henson a écrit :

> Hi everyone,
> yesterday one of Ireland's only Matrix 12's arrived in for service.
> Most of it is ok, but there is a PSU issue where the switch-mode frequency is audible for an hour
> after switch on, I know it's supposed to be 30kHz, and it needs attention but for the time being the
> voltages are of no major concern, all well within Spec.
> I have the Xpander service guide but not the Matrix 12, so my question is probably a little silly!
> The two 6 voice modules that sit one above the other, which card is 1-6 and which is 7-12.
> The two boards are different revisions, as this Matrix 12 is no. 9, the lower of the new boards is much
> newer, and I would guess that at some point the whole 6 voice board was replaced, the engineering
> change orders from the original Xpander are all implemented on the pcb of the newer module.
> The problem I'm having is random tuning failures every time I tune, but voices 7-12 seem to be the
> worst, failing more completely more often. The tuning comparator circuitry is very different between the
> two boards, with a lot of components tack-soldered around the newer one.
> Anyone out there have the service manual and/or the ECO's for the Matrix 12.
> 
> Regards,
> John.
>> Hi Mike !
>> 
>> Until now, the only solution is this kit : http://www.lenham.clara.net/sound/market.html It is quite expensive since you have to replace the 3 displays. I'm not sure this kit is already available. I'm studying a similar product, but I'm not close to the solution ;-)
>> 
>> Regards,
>> 
>> Christophe
>> 
>> Le 30 mai 2012 à 18:37, mike schmidt a écrit :
>> 
>>> Thanks everyone for your suggestions! I ended up going with little diode in the uk, as suggested by christophe. part works great, and was pretty cheap to boot. Fwiw, it had a mid 90s date code.
>>> 
>>> I have one Final issue with the Matrix, The 20th character on the top right display is out. every segment in that character is out. Any ideas? Does anyone have a replacement for the florescent display? I've swapped the driver ics around, in hopes that the problem would follow, but alas, it didnt.
>>> Thanks in advance!
>>> 
>>> -Mike
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