OBERHEIM SYNTH

I'd go through the two motherboards, pull every socketed chip and clean the pins with an artist's eraser, wipe with alcohol and reinstall before I started troubleshooting. Some of the old Texas Instruments chips are notorious for oxidation problems on the pins.


--- In oberheim@yahoogroups.com, "Paulo Palmieri" <paulopalmieri@...> wrote:
>
> I don´t have the eprom but have an OB-Xa with the same problem.
> In my case the buttons are working but the leds are flickering too and after 20 minutes they light off...
> I suppose that this could be an Eprom problem???
> 
> Paulo
> 
> 
> 
>   ----- Original Message ----- 
>   From: doug1052365 
>   To: oberheim@yahoogroups.com 
>   Sent: Tuesday, November 27, 2012 5:43 PM
>   Subject: [oberheim] OB-Xa Diagnostic EPROM needed
> 
> 
>     
>   I'm trying to repair this OB-Xa w/JL Cooper MIDI. 
>   Has no sound, all LEDs are flickering, buttons don't change anything.
>   The power supply is OK. It seems the CPU is not booting up. 
>   Does anyone have an image of the Diagnostic EPROM?
> 
>   Thanks 
> 
>   Doug
>