20 Most Recent NAD 2200 2Channel Amplifier Questions & Answers

put a magnet on the side of the relay or you must have a bad cap that drives power to the relay it is getting to much ac to it

Hello Hans
Have you checked the continuity of the primary windings of your amp's tranformer?. You have already stated that your amp went dead. If it is so, there must be some fault inside it, a fuse is blown, a shorted rectifier, a shorted filter capacitor, shorted output transitors or so. If so the mains fuse will blow out. have it happened in your amp?

Anyway the colour code cannot be predicted as Nad has different colour codes used for their primary winding input to their transformers. You just do one thing. The transformer primary have tappings in it, to input various voltage inputs, and that tapping are comming out in different colored wires. Measure the resistance of the winings, with a multimeter set to ohms range. One end of the winding will be direct, and the other end is tapped for different voltage inputs. The maximum resistance winding which you gets with respect to the common direct end will be meant for 240V, and next lesser meant for 220V. Leave the other ends free, and insulate its ends without touching each other, or touching in on the chasis. OK.

Possible output power transistor issue. Always use factory parts and use matched pairs.

See the picture:

http://wired4sound.net.au/systems/nad/nad.htm

Flip the switch to "bridged" and conenct a single speaker to the two red connectors.

The bios adjustments are critical, especially if it is run at high volume, and the original transistors must be used. The only solution that I can think of is measure the bios voltage on the good side, you should have one or two pods right near the output transistors and see how they match up with the problem side. I find that using a sub replacement usually will get you into trouble because the bias is not a match and the hfe is to low "output" Long shot have you checked www.nad.com for customer support to see if they can offer up the procedure in a download.

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 ..

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.

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).

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.

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.

Check your connections to the plug there will be a little spark. repair it

Solved the recognition of DTS signal issue but the DTS options/settings in the menus are still not appearing - believe the previous owner may have upgraded the software. The solution for the DTS signal recognition was an output setting on the DVD (blu-ray) player - digital output vs analog.

++++ https://nadelectronics.com/software/ https://nadelectronics.com/wp-content/uploads/2017/02/T755-English.pdf