Screen Adjust on a Mac Classic? — #16

Post #16 by aftermac

Source Forum	68kMLA
Category	Troubleshooting
Post Date	Sun, 14 Feb 2010 - 14:16
Original URL	https://68kmla.org/bb/threads/screen-adjust-on-a-mac-classic.19865/

Post

Scroll down a bit on this page and it shows the best way to discharge the CRT:

http://www.biwa.ne.jp/~shamada/fullmac/repairEng.html

Click to expand...

Actually, that site gives unnecessarily elaborate advice. The discharge tool he describes is utterly useless. The high voltage simply arcs across the resistor. Don't bother with a resistor; just use a grounded tool.

That said, I'll repeat my "broken record" utterance: There is no need to discharge the crt if you are not going to disconnect it from the analog board.

I wouldn't bother with the resister either. However, it shows a simple way to ground it with a screw driver and a wire with alligator clips at each end. And it shows you how to ground it. Nothing really elaborate about that... it's one of the simplest diagrams for discharging a CRT that I've seen.