I've never taken my e-meter apart, so I'm not sure which RS-232 chip their using, maybe Lee could tell us (most likely a MAX232A) I do know where you can get a free sample of this part, http://www.maxim-ic.com/samplescart.cfm?Action=ViewCart
Rod I have 2 blown e-meters old style and can't find a place to fix them . I think they both blow because of high voltage leakage at fuse(corrosion on fuse) I had one repaired years ago for about $50 don't know were I may pop it open .I would have to replace the driver?----- Original Message ----- From: "Lee Hart" <[EMAIL PROTECTED]> To: "EVlist - Electric Vehicle Discussion List" <[EMAIL PROTECTED]> Sent: Wednesday, September 11, 2002 7:05 PM Subject: E-meter serial port > 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 > >
