Re: Troubleshooting on an Apple II

["Tom Zuchowski" <eamoncd@bellsouth.net>]

"spacealbum" <dbackenkoehler@t-online.de> wrote in message 
1127913352.447169.134530@g14g2000cwa.googlegroups.com">news:1127913352.447169.134530@g14g2000cwa.googlegroups.com...
>I have an original Apple II which unfortunately is not working any
> more. The power supply gives correct voltages, but there is no beep
> when I power it up and no proper signal appears on the screen, even
> after a reset / ctrl-reset.
> I do have some scematics as well (Gardner and Sams) but don't know
> where to start.
> Can anyone help?
> spacealbum


Assuming that you don't have access to an oscilloscope, the first thing I 
would do would be to remove and reinsert all of the socketed IC's. If that 
doesn't work, then you will need an oscilloscope or a second Apple II to 
make any additional progress.

The most likely problem is simply bad seating of a socketed IC. If that's 
not it, then my next guess would be a bad EPROM; they do become high failure 
items after 20 years or so. But it could be almost anything.

Good luck!