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Re: I have a carver M 1.5 amp rt. channel is out.
Carver designs in general are not easy to repair. I would recommend that you send this unit into a Carver authorized service center. The likely problem is the output transistors, but the driver circuits and predrivers are not simple designs and if there is a problem there, it could effect the outputs. Tracing this will require equipment and schematics that I don't believe are available on the net.
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Be advised, this speaker system requires its own dedicated two channels of signal preamplification and power amplification and the required Active EQ is not to be used in the signal path of anything else. I have them as my Main Left and Right Speakers in a 7.1 set-up, but I'm using a 5-channel external Carver Power Amp to drive them, a sSb and the Rear Surrounds. The Active EQ is between the Receiver's Main L&R Preamp Outputs and the two Carver Amp channels that drive the 901's. Don't think you can just add the 901's into your living room and enjoy multichannel sound. Search around fixya, I have written extensively on this subject.
You should be able to online to the manufacturer of your products and download manuals. However, I will try to help.
Connect the sound output cables from your DVD player including, left/right(white/red) as well as the Coax output/input if your DVD and your Carver each have this feature for enhanced sound on certain DVDs, and connect to the matching DVD inputs on your Carver.
Then, connect your DVD video output either by use of your RGB(RED/GREEN/BLUE cables or an S Video cable to your the matching video inputs on your t.v.
On the back of your Carver, you will find outputs for left and right speakers, connect to the left and right speakers with proper wire. Make sure that the 2 conductor wire is connected with the same side(polarity) on all speakers for the best sound quality.
You will also find rear channel left and right outputs on your amp, connect those to your rear right and left speakers.
Connect the center channel speaker to the center channel speaker output on your amp.
If your Amp has a sub-woofer output and you have a subwoofer, make the connections on that as well.
Test all of the speakers with a feature that many amps have on the menu using your remote, simply called test. if all speakers are connected correctly you will be able to hear each one as they are individually tested by the amp. Hope this helps out.
I've owned four of the amps from this series and in no way are the power switches the weakness in this product. (A-220, A-753x, A-760x and an A-500x.) If yours is "broken" it had to be an environmental issue or single unit anomaly if yours hasn't held up. I don't get why people are asking your about the output characterstics of the amp because I don't see anything about THAT in your question. Go to Ebay.com and search for "Sunfire Amplifier" and look for a gentleman who's taken over "Rita's" Carver repair service. They both were affiliated with Bob Carver (you can also search for Bob himself under the seller name "audioshopper") and someone can direct you towards somebody who might (MIGHT) have a NOS power switch available. There have to be a ton of switches that will perform the same function, they just might not be a perfect Chassis fit. There's a solution to your problem. If nothing else, straight wire the switch on and plug the amp into a power strip.
You need an amplifier with at least 200 wpc to get the most out of your BOSE. Look into getting a NAD, ADCOM or CARVER amplifier. I prefer CARVER myself. I am running a CARVER M-500T(251 wpc) on my 901's and they sound incredible.
1-shut down all flourecent lamp and check. 2-check for your cables in a good condition and no touching of wires to the body of amp. 3-connect(ground loop isolator)code number(270-054)from radio shack near you and connect it between your audio device(like cd player and amp)
if it is not working then there is another serious problem , and it could be the amp IC or the volume IC but tests will need to be done to determine what is causing the failure , but it does sound like amp IC as a suspect since the rear were not even working , did the volume seem different when turning it up or down before the center quit or after the center quit?
The part that you speak of is called the emitterstabilizer resistor. It is common to the output pair on one channel. You will find that the large "output" transistors mounted to the heat sink either side of this resistor will most probably be faulty.
Best not to run the amp at all whilst in this condition.
To be sure that you have an effective repair, you will need to change both these parts, and also the "driver" transistors that connect to the outputs. They too are in symmetrical positions close to the the output transistors. You should also check that the 3 legged resistor you mentioned is measuring its correct value, and check all other low value resistors in the output stage area to that channel.
If you are not familiar with repairing this sort of equipment, perhaps you can find a repair guy with some experience on audio equipment, then this work should be all he needs to do to repair the amp. I would also ask him to "blanket resolder" the output/bias stages and power regulator stages in the amp as problems with heat stressed cracked/failed soldering and dry joints often cause these amps to blow the output transistors.
BE SURE THAT THE CORRECT PARTS ONLY are used for the repairs. Different transistors could cause future problems with the amp. The parts can be obtained relatively easily from a marantz distributor(we can find one in a country near to you). OR if you can give me the markings to each of the parts you need, I can provide you with an international source to get them from.
The amp is decent HiFi, and worth repair. Happy to provide you any assitance I can, Good Luck
If you can not find a service manual, look for the emitter resistors connected to the outputs. They are usually small value like .22 ohms. There should be one from the emitter of the 2SA3281 and one on the 2SC3281 emitters. These two resistors will connect together at the end opposite the emitter. Sometimes these resistors will be combined into one 3 legged resistor. If you can find these resistors, then measure the DC voltage across one of the resistors in the channel that was not bad. This is your reference. Then compare this to the same resistor in the channel you repaired. Here is a simplified diagram. You are looking for RE
The other thing you need to check is the DC voltage from the center of these two emitter resistors to ground. It should be very close to zero.
You do not need to replace the other set of transistors.
All measurements should be taken with the volume turned all the way down.
The DVD system problably doesent have PRE AMP outputs..you can take the record outputs from the DVD system and use them to connect to the input of the power amp. You then will need o use the Carvers volume controls as the volume controls as the record output of the DVD system will be a fixed output set at 0db.
check all op amps for correct voltage swing +-should be equal,test output of op amps no voltage should be present, use chasis gnd as tester neg.check voltage regulation especially 12v or 15v +-.note some amps show unequal led indications when only 1 channel connected to a load.I will try to get some more info on this specific amp because i don't know this circuit well,keep in touch as you update though.