Hi Don, I was wiring up a switch box for dual-sourcing hifi speakers, and looks like I had a short on the Sub (right) side circuit. This may have damaged the speaker amp, U1 on the DSP board (sh 3 of 9 from 6/2010 schematics).
Symptoms: If only the main RX is operating, output is roughly equal from both speakers. BTW, the Sub AF is set to Balance. If the sub RX is also enabled in diversity with balance set full CW, I hear nothing. If the control is set full CCW, I hear the main RX. If I use the headphone jack with sub RX enabled, I get the two signals as expected. -- This seems to point to U1, the speaker amp on the DSP since the headphone output is OK for both channels. Is there some way to confirm U1 is bad? I will be running a sig gen into the main and aux antenna inputs to drive the two channels separately and try to isolate the problem. Any ideas are welcome. Meanwhile, is the LM4950TS stereo amp available as a component from Elecraft, and is it user-repairable? Many Thanks! matt W6NIA K3 #24, K2 #2810 ______________________________________________________________ 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
