Vintage Synth Repair

greetings Doug:
   thanks for the reply. I'll try to make this brief.

1) no scanning of pot, switches, LEDs or D/A converter

2) supplies good, no ripple

3) data and address buss lines all active, look clean on 'scope

4) IC 108  (74LS42) pin 1  (ROM 0*) active.

5) All other fan out "glue" logic: no activity.

I would guess that the system fetches it initial instructions from ROM 0
Bad ROM????
What do you say?
MY ROM burner/reader can't read 2708s only 2716s and on up.

when I get this beast running I will need key tops. Do you sell those?

cheers
Kevin Siegenthaler




________________________________
From: synthparts <synthparts@...>
To: vintagesynthrepair@yahoogroups.com
Sent: Monday, September 5, 2011 4:04 AM
Subject: [vintagesynthrepair] Re: Oberheim OB-X diagnostic ROM


  
It would be nice to have if anyone can has a ROM image file for it but I've fixed a few OB-Xs and never found I needed it. Usually you can just use a meter and scope to find faults. What's the problem with yours? Doug synthparts.com

--- In vintagesynthrepair@yahoogroups.com, cordanova@... wrote:
>
> greetings 
>     I am in need of the factory obx diagnostic ROM
> or the file so I can burn one
> any leads would be most appriciated 
> Kevin S
>