Question about NAD T752 Receiver

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NAD T752 Hi have a NAD T752 reciver. Volume goes up and down - intermittently of its own accord.Also I have a problem with the no output except for FM. This again is internmittent. And hasn't occurred for a while, just annoying.If I turn off and turn on it sometime fixes itself.Seems like the things got a mind of its own absolutely no video from component video side. volume going intermittently also.

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  • Anonymous Mar 04, 2009

    I have a NAD T752 receiver and it is full of problems; this thing is the biggest piece of junk I have ever purchased. Do not repair the unit you will be thowing good money after bad. Throw it out and count your losses. Go buy a Japanese brand and be done with it.

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6 Suggested Answers

cheebster
  • 39 Answers

SOURCE: volume and multi channel output issue

Hi there. Are you familiar with board level repair for such products ? Your problem is most likely hardware. Either some of the final output transistors are fried, or it's a dsp problem, a regulator, a diode, a transistor in the circuit.. it could be a lot of things. But if everything was working fine and it quit someday without a change in the system's setup, it really looks like an hardware issue ! Do you have a way in the manual, that sets factory defaults, a kind of reset ? A lot of such units do have that. Try to unplug/interchange speakers as well, a shorted speaker could make the amp go nuts as well, but i wouldn't bet on it. Still, i'd check that out. Hope that helps ! cheebster.

Posted on Jun 26, 2007

larry james
  • 286 Answers

SOURCE: Receiver powers down after few minutes of play

has bad 12 volt regultor and 2 5.1 volt zener diodes on the main board in the regulator circuit, also may have a few caps near these parts which also need replacing. ref # for the 12 volt reg is u703 , kinda a major job.

Posted on Sep 18, 2007

  • 1 Answer

SOURCE: OSD for NAD T752

The blue screen indicates a proper connection (signal received by the monitor). Try selecting "amp" on your HTR 2 remote then use any directional button at the center of the remote, the keys which circle the "Enter" button. Hopefully you will then see the menu appear. Use the same directional keys to navigate the menus.

Posted on May 11, 2008

  • 4234 Answers

SOURCE: Intermittend no audio from digital inputs, flicker video monitor out, volume goes up but not down

Since the problem appears only after the unit has been run for a while, I'd be looking for any part close to a heat source. The odd behavior suggests that there is noise on the data lines for the volume control chip and the digital processing areas. Look for a bad 5V regulator +/or bad caps on the 5V line. Also check for poor solder connections in the power supply and final output stages.
Keep us posted.
Dan

Posted on May 13, 2008

SOURCE: NAD T752 Receiver. The unit

It's sitting on a totally open cabinent with sufficient space around it.

Posted on Sep 16, 2008

ronaldo_ross
  • 1056 Answers

SOURCE: Processor short-circuit.

I just crossed referenced that part, and the sofware couldn't find it. You need to find out what manucturer it is, then go to that web site and order it. How many pins does it have? Is it a sip, or a dip chip? sip stands up with pins at the bottom., dip lays flat with pins on both sides. You may have to order that from the product manufcturer.

Posted on Jul 01, 2009

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It could be entering protect mode because it has no speakers wired to it, have you tried connecting to all 6 speaker - out connections. Often, if an amp can't detect a load on all 6 channels it won't work. Also, have you checked the thermal fuses? a blown fuse could cause this problem.

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I hate to say this but the repair was not complete. If the sound levels are different with the balance in the middle, then either they missed a problem in one of the pre-amp stages, or they used an incorrect substitution for transistors in one or more stages. This unit should be brought back to complete the repair.

Any additional detail would require that I see the actual unit and poke around inside with test equipment.

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Aug 08, 2010 | NAD T752 Receiver

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Processor short-circuit.


I just crossed referenced that part, and the sofware couldn't find it. You need to find out what manucturer it is, then go to that web site and order it. How many pins does it have? Is it a sip, or a dip chip? sip stands up with pins at the bottom., dip lays flat with pins on both sides. You may have to order that from the product manufcturer.

Jul 01, 2009 | NAD T752 Receiver

1 Answer

Intermittend no audio from digital inputs, flicker video monitor out, volume goes up but not down


Since the problem appears only after the unit has been run for a while, I'd be looking for any part close to a heat source. The odd behavior suggests that there is noise on the data lines for the volume control chip and the digital processing areas. Look for a bad 5V regulator +/or bad caps on the 5V line. Also check for poor solder connections in the power supply and final output stages.
Keep us posted.
Dan

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Right Channel Not Working


I have had the front, left and right channels go out over time. I have fixed all of them, and each time it has turned out to be a cold solder joint. While I love NAD and will continue to purchase there equipment, this generation is plagued with poor workmanship.

To fix the channel going out, I removed the top cover. Back cover and 2nd card from the left (looking at the receiver from the back side). This card handles all of the audio processing. I have found cold solder joints all over this board which has caused channels to suddenly go quite. I have never found a bad component. Also, I have cleaned the interconnect to be backplane (board that the audio processing board connects to) in the case of the center channel going quite.

If you have poor FM reception, the first board from the left (looking at the receiver from the back side) may have a cold solder joint on the coaxial connection for the FM antenna.

Apr 26, 2008 | NAD T752 Receiver

1 Answer

OSD for NAD T752


The blue screen indicates a proper connection (signal received by the monitor). Try selecting "amp" on your HTR 2 remote then use any directional button at the center of the remote, the keys which circle the "Enter" button. Hopefully you will then see the menu appear. Use the same directional keys to navigate the menus.

Mar 28, 2008 | NAD T752 Receiver

1 Answer

Receiver powers down after few minutes of play


has bad 12 volt regultor and 2 5.1 volt zener diodes on the main board in the regulator circuit, also may have a few caps near these parts which also need replacing. ref # for the 12 volt reg is u703 , kinda a major job.

Aug 29, 2007 | NAD T752 Receiver

2 Answers

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It sounds like You have a Bad output Some where and its going in to protect mode disconnect spkrs and make sure volume is Down all the way and power up,Ck your wireing for Freyed wires and shorts at the inputs and outputs good Luck ttech

Jul 09, 2007 | NAD T752 Receiver

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