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The jumpers were the problem - the unit I bought did not have the jumpers. After reading your post I went back to the manual and sure enough there is one small line that states "In normal use these should be connected together using the links supplied."
I was supposed to go and return the unit to the seller yesterday and your post saved the day for me.
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If the speakers are all good and wiring too, then it's likely that a fault has developed in the main amp section. Till this is cleared the protection will not go away.
Never connect incompatible connections. Speaker outputs are for speaker inputs. Period.
The various inputs on this or most any amp are for Line Level signal with the exception of anything explicitly labeled "PHONO" as that would be for a non-preamplified turntable ONLY.
From what I have found online, Lab-In was a NAD feature that restored the frequencies that were rolled off when turntables were being used in the (assumed) preamplifier that fed this amp.
"NAD belleived at the time that practical PHONO stages and the preamp and power amplifier stages be rolled off at subsonic frequencies to prevent subsonic wow and flutter from Turntables and supersonic frequencies (EMI/RF/Radio) signals from getting into the system in the first place. Their notion was that if your ears cannot physically hear it, then why amplify it. For the PURIST, there were a set of LAB IN amplifier inputs with more extended response called "LAB IN" inputs"
Use the Lab In's UNLESS you have a turntable source.
Dear Tim,
Yes, you can connect your NAD as a preamp to the Carver power Amp.
Connect the NAD's pre-out to the input of the Carver Power Amp. You can then connect the Klipsch speaker to the Carver. Set the gain control on the NAD.
Now you should be able to control all the input and the main volume control from the NAD.
A 712 is not set up to use an Ipod USB dock. You can buy a dock that will use RCA jacks into an old stereo - Apple sells them, others too. Then the Ipod sits up and you can look at it. Or you can buy the 1/8" stereo plug to two RCA plugs that Radio Shack has been selling for 30-40 years, plug one end into your Ipod headphone jack, and run the two RCA plugs into your Aux input. That costs about $5, and is easy as pie. An Ipod will play through any old receiver, but the USB docks will not plug into them.
Use a 3.5mm stereo jack to RCA connector lead.
Connect this to the AUX input on the back of the 7140, and away you go. Get the lead as an accessory from just about any electronics hobby store.
The clicking is the sound of a bad relay. A relay is an electrical switch that opens and closes under the control of another electrical circuit. There is no user solution for this. You'll have to take it to an electronics repair shop (~$150) or dump the whole unit.
On my system the bulbs burned out some time ago. Today, I bought a pair of 12v micro lamps at Radio Shack (part 272-1092). Then removed the board behind the display and replaced the bulbs. This required some soldering. The bulbs have held up for more than 6 hours, so I do not think they are going to burn out.
Amplifier is about shot, need to replace IC pack or transistors (whichever it has). Could, remotely, be the speaker lines are installed incorrectly?out of phase. + to +, - to - from amp to speakers. Some amps will protect themselves when this condition occurs till fixed.
The only thing I can tell you for sure is that the mute indicator always flashes (very dimly) when the receiver is off. I have no idea why, but mine has always done this.
Connect this to the AUX input on the back of the 7140, and away you go. Get the lead as an accessory from just about any electronics hobby store.
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