My nad 310 just plain dead..no light, no sound..suspected the toroidal transformer. what is the output V of the toroidal? because i can't get the same part here, so wanted to get it from other manufacturer...or maybe will use normal type of transformer...thank u..
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Re: nad 310 no power
The output should be 24v ac. Sounds like you have a busted transformer. Did you check out the resistor in front of the transformer.
You sound like you know what your talking about so I will not bore you with suff like glass fuses and thermal couples.
Good luck, I have had a few items like this over the years. Sometimes it's just best to send them in to the manufacture. I would look for a replacement transformer. 120v ac to 24v ac around 5 amps. Test it out and see if it works... If not, send it in.
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i suspect the sound your hearing is a whooping sound. this is a dead give away. i suspect you have a shorted horizontal output transistor do to a bad flyback transformer. they will need to be replaced.
check your output stage for bad speakers cable or bare wire of cable touch the body of amp----short circuit speaker cable----bad speaker it self------ bad input cable or defective input device . disconnect all and check if it is ok---start to connect one by one from input to outputs------if all above failed you must contact service center for help.
Hi there. From memory they had bridge rectifier problems with them going short circuit. Check them first. Sometimes the toroidal transformer can go a shorted turn, in turn blowing primary fuses. try to soft start it whilst it is blowing fuses, Best bet is to make up a special lead that has a 60w light bulb wired in series with the mains power supply(or across the fuse holdwer that is blowing:). Limits the power in the circuit to ... well you guessed it 60 watts.
If you are refering to the DC +- 65 Volts the AC side will be different. What you need to find out is the average loaded AC volts on the secondary side of the transformer.
Below is the link to one of the biggest transformer companies in the world. I go to them all the time for transformers and power supplies for high end audio equipment and especialy for custom design and construction. I am sure they can wind you a new transformer once they know the exact specs you need.
Coincidentally enough, I have a customer's C541i on my bench right now!
At this point, you will need to open the cover and check the fuses. With the cover off, looking from the front, all four fuses are in the back left corner of the player, next to the toroidal (round) power transformer. If any of them have blown, replace that fuse with exactly its type and rating. DO NOT jumper over the fuse, or wrap foil around it. It is EXTREMELY rare for a CD player to blow a fuse unless there is a very serious failure someplace.
If the player blows the new fuse/fuses immediately it will need to be serviced. If the fuses hold, and the player plays, it was just one of those random things.
Now, IF all the fuses are good when you first check it, you have a mechanical failure in the power switch, or a broken solder joint on the board where it's attached. Luckily, a replacement switch is easy to find.
The inverter boards for the backlights fail on these HP F series monitors. Sometimes it is cold solder joints on toroidal coils. Sometimes the transistors that drive the output transformers (4). It is not difficult to repair if you have good soldering skills. I usually resolder the toroids and replace the transistors regardless of culprit. You may see the heating effects of bad components (discoloration) on the board.