On Dec 2, 2009, at 10:46 AM, John King wrote: > Thanks for the source of information, Jerry. I have looked at the schematic > on the Y2K site and see relay 601, the break in relay. Now I must physically > locate it and determine if the relay is indeed bad. I have 12.95 vac at > terminal 9 on the terminal board on rear of R390.
Not sure of the age or condition of your 390, but you might also just try pulling and reseating P120/J620 on the audio chassis. Among other stuff, this connector carries the operating voltage to the Break-in relay, K-602. (K-601 is actually the squelch relay). Both relays just ground the audio out from the AF amplifier V-601 through the interstage transformer T-601. Pins 1 and 2 of P120 carry the control voltage to the relay. You could measure the voltage there also, to make sure it's getting that far along when pin 9 of the rear connector strip is grounded. Grant/NQ5T ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/[email protected]/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: [email protected] To unsubscribe, send an email to [email protected] with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
