Drat... I can't find the post on the E-meter's serial port. I'll have to start the thread again.
There *is* a physical 100 ohm resistor between the serial port's common (pin 5 of the D-connector) and negative for the meter (pins 1 and 8 of the screw terminal block). If you accidentally plug the serial port into something without an isolator, this resistor blows like a fuse and the serial port quits working. If you want to try to fix it yourself, cut the warranty sticker, push down the two snap tabs at the rear, and the case pops open like a clamshell. Position the PC board with the screw terminal block on the bottom and the screw heads facing you, and look for the word "TOP" printed on the extreme lower left corner. Just above it are 3 surface-mount parts; two unmarked capacitors, and the 100 ohm resistor (marked "101") between them. If the resistor is blown, it is probably unreadable, or just plain gone (vaporized). Note that if you've blown this resistor, you have probably blown the driver chips as well. -- Lee A. Hart Ring the bells that still can ring 814 8th Ave. N. Forget your perfect offering Sartell, MN 56377 USA There is a crack in everything leeahart_at_earthlink.net That's how the light gets in - Leonard Cohen
