Amps channels aren't fused anymore. Solid state protection circuits shut everything down in the event of a problem.
Have you eliminated the left speaker and interconnects as a cause?
Is it powered directly from the Surr Back / Zone 2 speaker terminals or are you slaving an external amp to Zone 2 (Surr Back / Zone 2 OUT RCA)?
Page 38 suggests the external equipment and interconnects (if present) plays a part in this.
http://www.retrevo.com/support/Denon-AVR-886S-Receivers-manual/id/363dj788/t/2/
Page 45 discusses the setup for Zone 2 Amp Assignment. Can you verify it?
Okay, you seem to understand the hardware. Can you verify the zone 2 left channel is alive at the SURR BACK/Zone 2 pre-out (page 17) for it? Connect an RCA cable from each channel to, say, the TV to see if there is programming emitted. If the left channel's not squawking I wouldn't expect the speaker terminal for it to be active either.
Craig, looking back, you said, "All left channel speakers throughout the house are now non-funtional". If your amp channel is truly dead we might want to consider WHY. Can you attach the RIGHT channel speakers to the left channel and see if they work; and then the risky part: connect the left channel speakers to the right speaker output and gently test it at low volume to verify those speakers still work and don't cause amps to die; or use a DVM to look for shorts in the left speaker circuitry.
I suggest you put more attention into the wiring side than the amp side at this point. As speakers go ANY MEG is essentially an open circuit. Even 33 ohms sound suspiciously high but I have no idea how the speakers are wired. Something is/has changed and you need to have a plan to measure it if it appears to fail again.
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All left channel speakers throughout the house are now non-funtional. I disconnected the speaker wires from the Zone 2 output and measured the output voltages. The problem is definately wiith the Denon Zone 2 output for the left channel.
Zone2 to directly powers speakers throughout our house. No additional amps are in the circuit. These have worked perfectly for over 5 years up until this weekend. One channel (right side) works and has good variable voltage out (as a function of the volume control) and the other (left) is basically zero and non-responsive to adusting the volume control..
Zone 2 amp assignment is in accord with page 45.
All left channel speakers throughout the house are now non-funtional. I disconnected the speaker wires from the Zone 2 output and measured the output voltages. The problem is definately wiith the Denon Zone 2 output for the left channel.
Zone2 to directly powers speakers throughout our house. No additional amps are in the circuit. These have worked perfectly for over 5 years up until this weekend. One channel (right side) works and has good variable voltage out (as a function of the volume control) and the other (left) is basically zero and non-responsive to adusting the volume control..
Zone 2 amp assignment is in accord with page 45.
Good idea! Both zone 2 pre-amp channels (right & left) have good and equal sounding output quality.
This seems to suggest that the problem is in the final stages of amplification since the pre-amps are working fine.
Craig
Excellent suggestion. I had performed those same tests before contacting you, but at your suggestion decided to run them again.
When I ran them a few minutes ago, the outpput from the left speakers was basically zero volts and the wiring to the speakers was over 1 Meg ohm ( as it was before congtacting you all). The right side output was a variable voltage going up to over 1 volt and the wiring to the right speakers was about 33 ohms.
I then connected the right side speakers to the left output and to my surprise they worked. I then retested the left channel output voltage (which had previously been zero) and it now is variable up to over 1 volt and the ohms to the left speakers is now 33 ohms. I've reconnected all speaker wires and checked the system throughout the house and all now works correctly.
I have no idea what/how zone 2 went from non functioning on the left channel to working correctly...but alas that is the case.
Craig
Not much you can do now.
However, what circuit board and where is the zone 2 amp circuits. That's where we were heading when my system began to work again. I'm not so baffled by the possiblity that the problem was somehow associtated with my wiring but am very baffled by the fact that with my wiring comploetely disconnected, I did not get output signals from zone 2 left channel but did from the right channel. Similarly, zone 2 left channel read 1M+ ohms and the right channel 33ohms...before the system suddenly began working and the left channel resistanced dropped to 33ohms.
Craig
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