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Looper's Delight
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Hej all, A big thank you to Phillip, Adam, Paul, Andy, Don and Matthias. I will explain the problem and deliver the schematics to my tech. I've already tried to re-seat the ROMs, but it seems that there might be some chips hidden underneath the shiny metal caps (at least on this blackface Gibson EDP+) that might need to be re-seated! Those are really difficult to get to. But it should be possible by using a dremmel! Matthias. I will try some of your suggestions. Anyway, I'll definetely post back here when and if the problem gets solved. It might take a little while though. I really appreciate the help guys. What a cool place this is. All the best, Magnus Den 28/2/2008, skrev "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 >> > >