Re: EDP+ schematics?

[Matthias Grob <matilists@atarde.com.br>]

here is the essence:
http://matthias.grob.org/pEE/EDP_service_docs.zip


I just realize that I did answer your previous mail, but it did not  
make it to the list. I wrote:

if nothing makes it reboot, once its working, then it hardly can be a  
bad contact.

what kind of RAM do you use: 2, 3, 8 or 9 chips (ICs) / SIMM?
If its 8 or 9, try to to start it up with only 2 SIMMs in place (the  
ones next to the EPROMs, otherwise it never boots ;-)

another possibility:
At startup it switches from one crystal to the other and if their  
frequencies are too far apart, it crashes.

and there are many other possible hardware, mostly tolerance problems...

Matthias

On 27 Feb 2008, at 17:29, Magnus S. Hannibal wrote:

> Hi,
>
> Anyone know if its possible to find a schematic of the EDP+ anywhere?
> I have this annoying problem with my EDP+ sometimes refusing to boot  
> up.
> Its a random failure which is the worst kind of thing to diagnose.
> Please if anyone have information, tricks or any kind of help, please
> contact me.
> Read my old message underneath for details of the problem.
>
> Best regards,
> Magnus
>
> Hello,
>
> My EDP+ has a problem. Sometimes it refuses to boot correctly. It will
> light up in some of the leds and on the screen, but very briefly, and
> then it's blacked out. It is unpredictable but it seems like it  
> happens
> more often when the unit has been on for some hours. Also, when it  
> does
> black out, I can hear that there is still current in the electrical
> circuit.
>
> I should say that it is only during boot-up this happens, and only
> sometimes. If my unit boots up correctly, it is functioning as normal
> and stays on.
>
> I searched through the archive and someone suggested re-seating the  
> ROMs.
> Does this mean actually taking out the ROM chips (not sure exactly  
> which
> ones they are) and putting them back in again?
> I've checked all the SIMMs and made sure everything is in place. And
> I've reset the EDP+, but none of this have helped.
>
> Any suggestions?
>
> All the best from,
> Magnus
>