Hi all! First time poster. I obtained a Classic II while back and am not restoring it. Apparently I am a glutton for punishment because I haven’t given up yet. I cleaned and recapped and resoldered the Egret chip.
The problem is that computer boots with the bing sound (good!) but no video and no high voltage (boo) — but first I want to ask about something odd I found testing the voltage.
When I check for 5v and 12v through the floppy port, if I connect to ground on the floppy port connector or another shield on the logic board (eg the outsides of the DIN connectors), I get 0.335v and 1.262v respectively. However, if I put my probe on the computer case shielding, I get 5.074v and 12.19v.
Does that make sense? What is going on here? Photos of the measurement approach attached.
Thank you,
Bob
The problem is that computer boots with the bing sound (good!) but no video and no high voltage (boo) — but first I want to ask about something odd I found testing the voltage.
When I check for 5v and 12v through the floppy port, if I connect to ground on the floppy port connector or another shield on the logic board (eg the outsides of the DIN connectors), I get 0.335v and 1.262v respectively. However, if I put my probe on the computer case shielding, I get 5.074v and 12.19v.
Does that make sense? What is going on here? Photos of the measurement approach attached.
Thank you,
Bob