Gene, Check RP1 pin 7. If you do not find close to 8 volts there, you will need to track down the source of the problem in the 8R input to the KPA100.
If you find the voltage at RP1 pin 7 is not anywhere near 8 volts, check the source - what is the voltage on the K2 Control Board Q2 collector - that is the source for 8R. If the two points have significantly different voltages, you will have to find the discontinuity in the wires, connectors and PC traces between those two points. If RP1 pin 7 is OK, but U1 pin 27 is lower than normal, that may be OK - pin 27 of U1 is simply drawing a bit more power than usual - as long as the 5R and 5T outputs from U1 at pins 13 and 14 work OK, you will not have a problem. 73, Don W3FPR On 10/25/2011 11:26 AM, Eugene Worth wrote: > Hello all: > > I am building a remote KPA100 in an EC-2 enclosure. The KAT100-2 has already > been built and tested correctly. > > My K2 is S/N 5717 with firmware 2.04P. > > Problem: All the test point voltages are nominal (+/-10%) except U1 pin 27. > The voltage listed is 5.8 … I got 3.99 volts. Everything else in the section > of initial tests is flawless. > U1 pin 20 = 5.04 > U1 pin 28 = 5.56 > U2 pin 10 = 13.65 > U4 pin 1 = 13.65 > U4 pin 11 = 5.04 > All of the other values are 0 as noted in the checklist. > On initial power up, the K2 power supply voltage was 13.8 and current 0.36. > > Any hints on where to look for the problem? > > Thanks. > > gene > WG7GW > > ______________________________________________________________ > 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 > ______________________________________________________________ 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
