Commodore SX64 probs...

Hi Jules, I have an SX-64 myself that I still use to this day. I have seen the fault that you describe in the first system a few times before and have always managed to clear it by reseating the socketed chips and reseating the connections between the boards themselves. Particularly the connection of the board that runs vertical, as you look at the front of the system, at the back to the board perpendicular to it. That one connection tends to work itself loose over time from the bottom of the board up. Greg Manuel -----Original Message----- From: cctech-bounces(a)classiccmp.org [mailto:cctech-bounces@classiccmp.org]On Behalf Of Jules Richardson Sent: Saturday, July 17, 2004 5:16 PM To: classiccmp(a)classiccmp.org Subject: Commodore SX64 probs... I've got a pair of non-working Commodore SX64's here. One machine powers up, but the floppy drive light remains lit and I can hear the drive spinning continuously, and there's a 50% grey pattern filling the screen (i.e. pixels look to be alternating white/black). Actually, there's also short run of pixels middle-bottom of the screen which aren't illuminated at all. Pressing reset has no effect. Pressing caps-lock does result in the caps-lock light illuminating, but I don't know if that's a simple circuit hardwired to the key and doesn't go via the CPU... The second machine is totally dead - no activity whatsoever. There's a *very faint* humming noise from the monitor area, typical of a display that's at least getting power though - but on the CPU side of things no chips seem to be getting remotely warm, suggesting that there's no +5V. Before I start digging deeper, does the fault with the first machine sound familiar, and are there any common PSU faults which affect these systems? Plus, anyone have schematics they could scan? Be nice to get one of them going. One keyboard is damaged (plus I only have the one original keyboard cable), so it's only really viable to have one running, but I'd like to get to the bottom of what's up with both of them... cheers, Jules ==> Most computers are infected with SPYWARE. Check yours for free at http://YourSpySweeper.com/ * FREE spam killer: http://eliminatespam.com * FREE PopUp Buster+: http://popupbuster.net