NAD Audio Players & Recorders - Recent Questions, Troubleshooting & Support

You have a fault in the power amp. Identify the faulty channel by following the input leads. As, a stereo amp is basically two mono amps put together. You can compare the bad channel with the good one. First thing to do is a visual look around. If you see something odd looking in one channel and it's the faulty one, compared with the good channel, you might have found the cause. Look at the devices or device on the heatsink especially. If nothing stands out, the next thing to do is test the channels. You can do this in two ways. First, by touching the parts on each channel (with power on) with an insulated screwdriver. If you get a buzz in one channel and nothing in the bad one, in the same places of course! You might have located the faulty device. You can do the same with a volt meter. The readings should be the same in each channel. Work forward from the end of the preamp stage. Don't bother with the power supply parts, as they are common to both channels. By the way, don't short anything!

Distortion is categorized in Hum, Motorboating etc. Anyway see page 9 of owner manual for help. NAD C325BEE AMPLIFIER OWNER'S MANUAL ' ManualsLib For further help see page 24 of Service Manual NAD C 325BEE SERVICE MANUAL Pdf Download ' ManualsLib

I have nad t748 but not switching on the power on tha auto turn off

It is funny, I was just reading an article today about New Acoustic Dimension Cassette decks saying they were top of the line and equal to Nakamichi. The most likely reason is that the volume control needs cleaning with Electrical Switch Cleaner. You would have to remove the case and look. It is worth a quick spray. This says it has a motorized volume control. https://www.google.com/search?q=nad+1600+receiver+volume+on+high+volume ..

If I torn off the Nad 755, the setings on the osd menu is gone ! What I van do ? sorry for my english

You can find volume and balance control components for the NAD 1300 preamp from a variety of sources. You can check with NAD directly, or look for parts on websites such as eBay or Amazon. Additionally, you may be able to find parts from audio/electronics shops in your local area.

make sure the trigger switch in the back did not get switched to trigger, if thats o.k. it may have 2 regulators 2 5.1 zener diode and a capacitor or 2 deffective on the board in the regulator circuit. I have yet to see any bad outputs in a Nad T752, but I have only worked on three so far. Larry James

found same problem with mine, solution .. place clean paper over the optic, then a magnet, leave for a few seconds, the build up of static causes a magnetic field in the optic preventing it tracking, have cured a few other brands with this as well .. shows manufactures are putting inferior parts in to their players, hope this helps !!

Yes, the Bose user manualhttp://worldwide.bose.com/axa/assets/pdf/owner_guides/StereoSpeakers/901vi_guide.pdfsays that any amp with 10-450 WRMS is OK. The speakers impedance is given as 8 ohms, so the amp is compatible.Note that Bose say you have to have the Bose equalizer connected as well.

NAD (New Acoustic Dimension) was all the rage when I was into composite audio in the 1970s. Not sure why would want to tweak that sweet clear natural sound like the performers played it. Your problem will be that you are loading an amp to a pre amp. https://www.google.com/search?q=Nad+2600 https://www.google.com/search?q=Nad+3020 https://www.google.com/search?q=nad+3020+nad+2600+graphic+equalizer ..

Does it occur on both channels at the same time, (power supply) or independant channels, (coupling capacitor).

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.

Ref NAD C272 Power Amp how do I connect a ground Wire to this Amp this amp has only got a 230 Bolt 2 Prong Plug. There is no 3 Rd Earth Prong .and when my amp is on get high pitch Noise on my speakers. I need to ground this amp how do I do this. Please Confirm

Hi aartman

Yes it does have backlamps.

They are soldered to the PCB so you will need a few tools like a soldering iron, philips screwdrivers, solder, and some replacement lamps. Replace the lamps with this type from Farnell electronics. They have a 15000 hr life expectancy and last alot longer in the unit. I have tried many types of lamps over the years, and found these are the best choice if you want them to last.

FOR YOUR SAFETY-BE SURE TO DISCONNECT FROM THE MAINS BEFORE REMOVING THE LID

To get access to the lamps, you need to pull the main PCB out of the chassis to then get access to the bottom side of the printed circuit board where the 2 screws that retain the white lamp reflector assembly. Change both lamps with the type I mentioned,
Be careful not to flex the LCD display that is now exposed, it is quite fragile with the support of the lamp reflector cover no longer in place. ... reverse procedure to reassemble and away you go.

I am more than happy to talk about this solution with you further. Just ask away. Cheers

regards
robotek

I'm going to assume that you mean it jumps around, volume up/down by itself? If so, you have a bad rotary encoder. If you are interested in having your NAD repaired, please visit my website at audioserviceclinic.com. You may contact me there. Thank you.

click this link

... http://www.thefind.com/instruments/info-rotary-knob

This is the technical solution, you have to open the unit:Locate IC33 and connect pin 6 to ground, connect power, and then remove the ground connection at pin 6.The unit will then boot up in factory default.Henrik Pedersen

Bad connections along the front PCB.

I would suggest that the fuse in the amplifier has blown. This is usually caused by a bad amplifier component (duh!).

The unusual part of your problem is that sound is being passed. When a component dies, signal stops as the continuity is broken.

Which could also suggest the power supply. Transistors work like relays, you turn on the control signal and the transistor opens or closes. It isa possible that this control voltage is not being passed.


Either way, this will require shop work

Jeff

https://elektrotanya.com/nad_c370_sm.pdf/download.html https://music-electronics-forum.com/forum/amplification/other-amps/920148-nad-c-370-no-sound-from-speaker-outputs#post920172 https://audiokarma.org/forums/index.php?threads/nad-c370-repair.916194/