Xpantastic!

Hi

EP has good advice about your problem.

Also,
It sounds to me like your M12 stuck
in start-up. This points to the main processor board. 

I would start by carefully disconnecting and reconnecting the cables 
that run to the main processor board. 

Do this until you run out of connectors to check, Do this with both 
ends of each cable. 

If still not working,
All chips are in a socket. This is a good and bad thing.
On the good side repairs are easy and there is little chance to damage the 
circuit board.

On the bad side :
The chips can work themselves loose over time, and dirt, corrosion, etc
can build up on the connection between the IC and the socket. 
But re-seating them often fixes many problems

So

Try pushing down all the IC's on the main processor board.
Some may have worked themselves loose.

Next:
What you might try is to gently remove and re-seat the 
microprocessor on the main board, and the associated logic and
memory chips.

Best Luck

Karl Schmeer




________________________________
From: E P <erfly44@...>
To: xpantastic@yahoogroups.com
Sent: Tue, February 15, 2011 4:42:24 PM
Subject: Re : [xpantastic] Matrix 12 not booting up

  
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 écrit :


>De: r_j_d_2.phila <r_j_d_2.phila@...>
>Objet: [xpantastic] Matrix 12 not booting up
>À: xpantastic@yahoogroups.com
>Date: Mardi 15 février 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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