An intermittent or open circuit problem that has occurred on occasion is caused by misaligning TMP male and pressing it too hard into the socket. What can happen is that the male pin hits the metal edge of the female socket inside the connector and actually pushes the metal socket out of its housing. The result is that the female socket edge is just resting against the male pin rather than having the male pin inside the socket even though the connector appears properly mated. This results in an intermittent contact.
The solution is to visually inspect the various TMP connectors on the KRX3 board as well as those on the KREF3 and Aux KSYN3 board. Looking into the socket you should see the metal receptacle inside the white plastic (Teflon?). IF all you can see is plastic, you may have pushed the metal socket back out of the connector. You can get access to the back of the connector and push the metal receptacle back in place but it will likely tend to bend again more easily now that it has been pushed out of place once. Be especially careful of it when plugging in the TMP cable. 73, Ron AC7AC -----Original Message----- From: Elecraft [mailto:[email protected]] On Behalf Of la3rk Sent: Thursday, May 4, 2017 12:32 AM To: [email protected] Subject: [Elecraft] K3 with subrx - intermittent main RX problem and pwr out I have a K3 approx 8 years old. Fully equipped with subrx, 100W PA, antenna tuner and in/out module. When I connect the subrx, the main rx sometimes loses signal and at the same time power out goes to zero. Looking at the diagrams, I suspect there is an intermittent contact problem in relay K1 shown on the SUBIN schematic. This relay is responsible for sending antenna signals to the splitter when using the subrx and also connects the splitter output back to the main rx. The same contacts on the relay is also a path for the low level tx signal. An intermittent contact on this relay and particularly contacts 3-4 could explain the behaviour I see. Has anybody experience relay failures and if yes have they managed to change out the relay? Sending the K3 back to Elecraft is not a preferred option as shipping charges to/from Norway will be fairly expensive. Regards LA3RK - Olaf Devik ----- 73 de LA3RK Olaf -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-with-subrx-intermittent-main-RX-prob lem-and-pwr-out-tp7630294.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ 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 Message delivered to [email protected] ______________________________________________________________ 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 Message delivered to [email protected]
