Chris, It might be OK (and most likely is). Pins 12 and 30 are connected to ground, so between pins 11 and 12 and also between 30 and 31, you are reading the resistance of the 6 volt rail to ground - you are measuring not only the 78L06, but also U2, U3 and U5 which are also connected to this same voltage rail.
It may be too that your DMM is using a higher than normal voltage to measure resistance (which can turn on active devices), or that the polarity of your leads is different than most DMMs which explains why the reding is OK when the leads are reversed. Try a different DMM if you can. 73, Don W3FPR [email protected] wrote: > Before mounting the LCD on the K1 FP board, I am checking the > resistances of adjacent pins on the U1 socket. > > Most of them come out unmeasurably high >1M, but 30 and 31 (and 11 > & 12) on the U1 socket come out as 480 ohm which is too low. If I > reverse the leads on my DMM, I get 1.65k. Confusing. > > I had a look at the schematic and the pins connect to Vss and Vdd, > where the 6 volt regulator U4 is connected. > > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
