>>what is the little neon >>bulb (think it's a neon bulb) for on the Mac Plus analog board? I've >>got one board that probably has a bad solder joint of cracked trace. >>It's intermittent as far as working and when one flexes it a bit it >>cuts out (machine restarts or shuts down) and the neon bulb comes on. >>I figure that bulb must be a clue to what's happening when I flex the >>board.
>I bet it's an indicator of some sort for the situation you describe :) I hate to overwrite pickle's aswer here, of which I think manufacturers should include in their products as much as possible (bend-bulbs, crack-bulbs, bad-soldr-joint-bulbs, coffee-on-keyboard-bulbs, MS-bulbs, dust-bunnie-bulbs, too-much-internetting-bulbs etc :), but neon bulbs often are used as voltage limiters. The start to conduct (e.g. to ground) at a certain voltage, making it difficult for the voltage to rise any further. As limiters, they are not very precise, but rugged and cheap. O course I could be wrong, the bulb being a true ultra-deluxe dashboard light - for the repairman. �mart -- Compact Macs is sponsored by <http://lowendmac.com/>. Support Low End Mac <http://lowendmac.com/lists/support.html> Compact Macs list info: <http://lowendmac.com/lists/compact.shtml> The FAQ: <http://macfaq.org/> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive:<http://www.mail-archive.com/compact.macs%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
