> Rick Woodbury wrote: > >> There is apparently a 100 ohm resistor in the E-Meter between >> pin 1 of the main connector and pin 5 of the DB-9. This gets >> instantly fried as soon as it's hooked up to a chassis >> grounded pin 5 of the DB-9 when power is applied. > >> Does anyone know where the resistor is that gets fried? I >> looked at the board carefully with a magnifying visor and >> couldn't find a trace. > > Hi Rick, > > I can't help with identifying the location of the fried resistor, but > would point out that resistors tend to fry open, so since you already > know which two points the resistor needs to be connected between, you > ought to be able to make the meters reliable again by connecting a 100R > resistor appropriately on the ~outside~ of the meter. > > With a bit of care, it should be possible to solder one end of the > resistor to the appropriate pin of the DB9 where it attaches to the PCB > behind the terminal strip, and run the other lead (or a flexible wire > attached to it) to pin 1 of the terminal strip.
Thanks Roger. Actually when the first one started transmitting erroneous data I found that pin 5 of the DB-9 on the E-Meter was not grounded. The manual clearly states that it should be so I connected a jumper. The only reason I assumed that there is a 100 ohm resistor is because when I got the replacement E-Meter and checked to see if a new one was actually grounded I got a 100 ohm resistance. After frying that one too, I then got another one and found 100 ohms again. The one I jumpered without the resistor had some interesting characteristics. When I had the jumper connected, the volts showed on the E-Meter display correctly, however, the amps showed 600 mA at rest and should have been about 100 mA. As soon as I ran the motors the display went to over 1000 A, highly unlikely since the wheels were off the ground. I'll try sticking a 100 Ohm in instead of the jumper and see if works then. If the jumper is disconnected the whole E-Meter runs fine. Thanks for your input. Rick Woodbury Phone: (509) 624-0762 President, Commuter Cars Corporation Toll-free: (800) 468-0944 Doubling the capacity of freeways Fax: (509) 624-1466 Quadrupling the capacity of parking Cellular: (509) 979-1815 Zero to 60 in under 4 seconds 715 E. Sprague Ave., Suite 114 Email: [EMAIL PROTECTED] Spokane, WA 99202 Web: http://www.commutercars.com
