"Mark Nace" <[EMAIL PROTECTED]> made an utterence to the drakelist gang ---------------------------------------------------------------------- Matt, I have a TR-3 that I bought as a junker, and R40, 470 ohm, had vaporized. Replaced it, and as I kind of expected, it also started smoking upon turning the band switch also. It was a very perplexing problem, and after some resistance measurements and quick voltage measurements turning the unit on and off very quickly, I found that the 250 volt line was being placed across R40 due to a double-make on the switch wafer due to the shaft being "wallowed out" and not registering correctly. I positioned the wafer correctly, and carefully added some fast-setting polyester cement on each side, right on the shaft and up onto the wafer a little. It cured the problem, and the TR-3 works perfectly now. Of course, the best fix would be to replace the wafer, but I only paid about 80 bucks for the radio, and this was a good fix at the time. Not sure about the lights, but make sure the bulbs are installed correctly, and not making contact with the metal shrouds that guide the light.
Anyway....hope this helps. Let us know how it goes. 73, Mark N5KAE ----- Original Message ----- From: "Matthew E. McNeely" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, September 09, 2004 2:56 PM Subject: [drakelist] TR-4 band switch problem > > "Matthew E. McNeely" <[EMAIL PROTECTED]> made an utterence to the drakelist gang > ---------------------------------------------------------------------- > I have a wonderful early TR-4 that works well except that sometimes when I > change bands with the band switch I hear a snap sizzle sound and resistor > R40 a 470 ohm resistor burns up. I replace the resistor and the TR-4 works > fine except that the upper and lower usb lights are both on in the upper > ssb position for any band. if I let the TR-4 sit for while without being > used after the initial repair the ssb indicator lights work as they should. > So my question for those more knowledgeable than are out there is what may > be going on? I don't see why R40 is blowing up? and what that has to do > with the usb lsb lights and why when the unit sits over night after the > repair things work correctly. > Oh by the way the ssb works just fine it seems like just the lights or the > light switching is what is fouled up. > > Thanks in advance for any help. > > Matt > > K1MCN > > ---------------------------------------------------------------------- > On Behalf of "Matthew E. McNeely" <[EMAIL PROTECTED]> > Submissions: [EMAIL PROTECTED] > Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body > Hopelessly Lost: [EMAIL PROTECTED] - help in body of message > Zerobeat Web Page: http://www.zerobeat.net > Brought to you courtesy of TLCHost.net http://www.tlchost.net/ > ---------------------------------------------------------------------- > ---------------------------------------------------------------------- On Behalf of "Mark Nace" <[EMAIL PROTECTED]> Submissions: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: http://www.zerobeat.net Brought to you courtesy of TLCHost.net http://www.tlchost.net/ ----------------------------------------------------------------------
