I have a Sonance Sonamp SAT275 amplifier hooked up to a new (to me) Sony DG810 receiver hooked up through the SA-CD/CD CD-R plug. The amp is pushing sound to dining room speakers, porch speakers and outdoor speakers. They are not working. The amp doesn't seem to be recognizing a signal coming from the receiver.
The Sonamp 275 has Signal LEDs on the front panel, above the Volume pots. If signal is present at the RCA inputs, the Signal LEDs will be blinking.
Most likely, there isn't any line level audio signal coming from the receiver. Hook RCAs to Tape Output or MD output and check system using the Tuner which is an analog signal.
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