No output - After powering on, the normal momentary delay occurs and I hear the relay kick in. - Muting and canceling mute to ensure muting was off. - All front panel and all remote functions are working (radio tuning, DSP, etc.). - Selecting front and/or rear speakers does not matter. - No headphone output - Removed the three fuses and all ohm out ok. - After powering off for a while, the unit sometime produces only static output to the speakers, most times it does not. - Tried all inputs from CD, Tape, Aux, VCR1, and LD/TV (cable/dvr), all of which were previously operating fine. - No components appear to be burnt, etc.

Mute Microphone
With the handset
You can temporarily turn Off the microphone so that the person you are talking with cannot hear you.
1)Press menu/del during talk mode (while phone is in use).
2)Press ring/vol/? or ring/vol/? to move the pointer to Mute and then select/
.
Mute On and appear in the display. To cancel muting, repeat above step again when Mute
is set to on, Mute Off appears.
With the base
While using the base speakerphone, press mute on the base to turn Off the microphone.
Press mute again or press (speaker) to cancel muting.

Uniden offers a variety of electronics products including corded and cordless telephones. Each of these phones features the ability to mute the phone whenever you desire. Muting the phone can be done as often as you like and canceled as you desire. The steps to muting your phone will vary depending on the type of phone you are using.
b> Locate the "Mute" button on the phone. The button will be on the keypad near the number keys. Press the "Mute" button to mute the phone. Look for the "Mute" indicator on the phone's display to ensure that the phone is muted. Speakerphone Volume Use the VOL (+ or -) buttons to adjust the speakerphone listening volume while it is in use.

http://www.uniden.com/pdf/1380BKom.pdf users guide

Maybe you have MUTING selected. Turn the volume knob up or toggle the Mute control on the remote.

If it defaults to muting on power up find the manual and search it for a default volume setting.

http://www.retrevo.com/support/QSC-RMX-4050HD-Amps-manual/id/23107ci658/t/2/

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CLIP: red, to the left of each Gain control.

Normal indication: illuminates whenever the amplifier is driven beyond full power. The LED's brightness indicates the amount of distortion. Distortion that causes only brief flashing may not be audible.

During muting, the indicator fully illuminates. This occurs during normal "On-Off" muting.

Abnormal indication:

•Bright red illumination while the amp is being used indicates either thermal muting or a shorted output.

•If the amplifier overheats, the fan will run at full speed, and operation should resume within one minute. Allow the fan to run, and make sure the amplifier ventilation is adequate.

•A shorted or overloaded output circuit will cause excessive Clip flashing and possible overheating.

•If distortion is audible without a Clip indication, the problem is either before or after the amplifier. Check for damaged speakers or overloaded signal source. The amplifier Gain control should be in the upper half of its range to prevent input overload.

That's normal.

The Auto Muting mode mutes the audio output of the tuner if the station is not sufficciently strong to be accurately tuned. Otherwise you would hear all that interstation hash noise.

Press the FM Mode button to change it to Mono if you want to manually tune a hard-to-reach station. It will be in Mono.

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AUTO MUTING Normally select this.
When a program is broadcast in stereo, you will hear stereo sound; when in monaural, you will hear monaural sound.
This mode is also useful to suppress static noise between stations. The AUTO MUTING indicator lights up on the display.

This not muting, but protect mode. This means that a problem was detected internally and the unit has shutdown to prevent further damage. The most common cause of this is a failure of the output transistors. Expect a parts cost inthe $20-40 range for this repair.

Dan

It's a muting problem, not a power amp problem. The muting circuit on this amp has a very high impedance node, which makes it very sensitive. Right next to the area of the board that contains the muting circuit is a large-ish capacitor that is held in place by a blob of glue. The glue has usually spread out enough to reach some of the muting components. The glue decays over time and becomes slightly conductive. This is enough to keep the amplifier in the muted state, permanently, instead of releasing it about two seconds after power-on.
The picture shows the amplifier with the top removed. The box is where the old glue used to be. The glue is to hold the purple tubular capacitor steady. It is not really necessary unless you have the amp sat on top of your speakers (not recommended).
To remove the glue, unplug the amp from the mains, remove the lid (six screws), locate the area in the picture and scratch the glue away with a large needle or tiny screwdriver. The most important bit is to remove the glue from the bare wires at the ends of the resistors (the brown stripy things).
It may also be necessary to scrub dust etc from around that area, and also from the small, thin wires coming from the on-off switch onto the board.
If this doesn't solve the problem, or it returns, the capacitor that determines the length of the muting period may have failed. This is a slightly less diy repair as you will need a soldering iron and a new capacitor.

The echo you hear is the audio delay between your TV speakers and Bose speakers. Muting (or lowering the volume) on the TV will eliminate the echo. Some TVs have a setting to turn of TV speakers entirely, allowing you to listen to your TVs audio strictly through your Bose system.

What is the signal level at the tape-out jacks? Is that level "normal"?
Dan