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 a écrit :
De: r_j_d_2.phila
Objet: [xpantastic] Matrix 12 not booting up
À: xpantastic@yahoogroups.com
Date: Mardi 15 février 2011, 21h03Hi 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
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/xpantastic/
<*> Your email settings:
; Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/xpantastic/join
(Yahoo! ID required)
<*> To change settings via email:
xpantastic-digest@yahoogroups.com
xpantastic-fullfeatured@yahoogroups.com
<*> To unsubscribe from this group, send an email to:
xpantastic-unsubscribe@yahoogroups.com
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/