Top 20 NAD 712 Questions & Answers

Hi DERAIN Francois,First of all, thank you for purchasing the service manual of NAD T753.Please email me at [email protected] I will send to you the copy. It is a PDF file format and can't be upload here.Again, thank you so much!Take care and have a great day!Rating and feedback are highly appreciated.mjsazon

Check to see if one of the Tape Monitors is ON. Turn it OFF.

There's supposed to be a pair of jumpers between Pre Out and Main In. Are they there? If not, install a short RCA cable pair.

Funny that you just posted. On Monday, I dropped off my G-7700 at The Audio Lab in Harvard Square, Cambridge, MA. http://www.theaudiolab.com/

As soon as I walked in the place I knew I was at the right spot. They service and sell some really high-end vintage units as well as carry brand new high-end audio equipment. $60/hr for service work. As a gauge, my G-7700 took 2hrs to do a complete overhaul, which included replacing some pots, re-soldering cold joints, calibrating the tuner and other components. i thought it worked really well before!

Experienced, knowledgeable, efficient.

Give them a call and ship your G-7700 to them. It's worth it.
MRE

There could be a number of reasons for this. It woyld help if you could indicate what resistors you changed. The circuit designation should be marked on the PC board. Please post those here and I'll look further and provide some possible solutions.

Thanks,
Dan

The contacts in the A B speaker selector switch had degraded on my NAD 7130 receiver. Distortion and signal loss would come and go. Contact cleaner and wriggling the swx knob became useless. Then, years ago I jumped the swx with small lengths of bare wire and tinned the whole thing with solder. Never had a problem since and it probably improved the receiver because it eliminated a component in the output stage that could (and did) introduce distortion.

Hi okapi6

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.

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.

In my case, if I push in on the balance knob, I can get the channel that quits to work for a while.
This leads me to believe that the pot is dirty as opposed to a circuit or component failure.
A couple of years ago, I sprayed circuit cleaner into the pot as best I could and the problem disappeared but, it has returned.
My next attempt will be with one of the newer cleaner/lubricators that are available now.
I don't know if this will solve your problem but, it might be worth a try.
BTW, getting access to the volume/balance pots takes some doing. As long as you are there treat both pots.
Greydog(1)
G

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.

Here Ya Go!
Note: pages 60-62 is the wiring diagram.


http://service.us.panasonic.com/OPERMANPDF/CQ-DF802U.PDF

problem is- intermittent speaker relay. You can cleaned contacts or better upgrade relay to better one (sealed)  Dariusz

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.

Bad regulators in the power supply or the capacitors in the power supply are drying up. Needs to be taken into a shope as there are no user serviceable parts inside these units good Luck

the lamps i use on all NAD displays(and have done since the early 1990's) last heaps longer.You can get them from RS components in your country. They are a 14v 37ma type, and seem to last. Never had any come back for replacement again. P/N 351-9585. Increasing the ballast resistor where fitted by 25% in valua also helps preserve them

http://www.bulbdirect.com/ who's your mommy? ;]

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

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 ..