Panasonic SAHT730 Technical Guide - Page 23

3. Internal test tone - An alternative to input a signal to test the amplifier is to use the internal speaker level test mode. Once in this test mode, IC2011 generates a fixed level signal to each speaker, one at a time except the subwoofer. The test tone lasts for approx half second at each speaker and repeats. As feedback, the display shows which channel is test active. Test Tone generating procedure: a) Turn the unit on. b) Press the front panel or remote input selector to select DVD / CD (front panel display). c) On the remote top opaque buttons, press DVD (so the remote buttons are for DVD mode. d) On the remote, press both the SHIFT and TEST buttons. The front panel display will show the speakers that are producing the test tone. e) Stop the test tone sequence - press ENTER or both SHIFT & TEST buttons. B Tracing the audio • Audio output IC2011 can be traced by following the audio path through coupling capacitors at the top of the main board. • Use figure 15 to identify the signal path and figure 16 to locate the capacitors in the path. Follow the signal from capacitor to capacitor with a scope to determine where the signal is lost. Figure 16 SA-HT730 / SAHT930 23