Perfecta, gracias una vez más
poco a poco y gracias a gente como tú se van aprendiendo cosas, a ver si un día de estos me atrevo a fabricarme un interface
El link que me has puesto ya lo había visto, fué el único sitio donde encontré algo de información en castellano pero mis averías no coinciden con ninguna de las ahí descritas.
Después también encontré algo interesante aquí:
http://www.worldofspectrum.org/SpectrumRepairGuide/Pero tampoco me entero de gran cosa.
La segunda avería parece ser esta:
"Alternate thick black & white vertical bars, with or without flashing pieces. Check CPU IC2 is plugged in correctly, or any legs that were cut are resoldered, also check the ROM, IC5. Test or change TR6 and TR3 both ZTX313's, if OK re-measure legs 2-14 of IC6 - IC13. If OK, let the computer cool down for five minutes, then measure accurately legs 1 of IC6 (should be above 13k), now run the computer for five minutes. Again measure Pin 1 of IC6, if it has dropped significantly, then suspect any of the remaining 4116's that have not been changed. If there are only a couple of the originals left, then it would be prudent to change them. To help find the culprits, leave the computer on again for five minutes, then feel if any are getting warm, if so, you are lucky. If not, cut pin 1 of each chip, just after switching off and measure on 20k, any that are below 13k replace.
Screen full of bright, shimmering, fine herring-bone pattern. Check for -5v on leg 1 IC6, it may have vanished, if so change TR4. Check that all the cut legs are joined correctly, especially leg 1 of IC6 - IC13.
Black screen, with lots, or just one or two vertical very thin dash lines. This is more than certain, to be one or more 4116's (so you have missed one). Also check the ULA, IC1, for straddling legs, bent or damaged legs.
A blank, black screen only, no lines or anything. The likely cause, is one of the upper RAM, IC15 - IC22, cut pin 2 - 14 of each chip, that have not previously been replaced, trying the computer between each chip.
Flashing blocks, or a mixture of above, make sure, both legs of each upper memory chip that may have been cut, have been resoldered correctly. Check ROM is correct type for links and also plugged in correctly. If the original ROM, then check any legs that may have been cut. If at fault then replace ROM."
La reparación parece complicada, pero bueno, por lo menos ya he encontrado algo.
Gracias
