I have a Nad C520 cd Player which works fine but emits a high pitched ringing noise which I located to a component on the circuit board the sound is not throught the speakers it is comming directly from the circuit board I was wondering if anyone has come across this problem before and is it fixable Thanks
From your description, it sounds as if the noise is coming from the circuit that controls the display backlight. If I recall correctly, the C520 has an EL backlight just like the C521 (which I have one of). On the front of the circuit board, there should be a little yellow trimmer potentiometer that controls the brightness of the display. It may be that the noise will go away if the brightness is turned down some. If the noise varies as you turn the controller, but doesn't go away completely, the backlight may need servicing.
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This is not a problem but may be due to the surge current that occurs due to the charging of the power supply Filter capacitors. This might be made less with some silicone sealant. Best to have a Technician look at it as it could also mean a too high of current draw due to aged and defective Chinese Capacitors- yes the have infiltrated this business too and are the result of many a failures including flat panel display TV's and computer monitors.
If it's the C541i version then there should be a switch on the rear of the unit. Flick this switch and all should be fine. I think it's something to do with interconnecting other NAD products why this switch is used.
Model number? If it uses analog audio cables you might have a noise leak from improper shielding. Reseat the cables or try new ones.
I'd also consider if you're using dimmer-controlled lighting in the room. They generate a lot of electronic noise. I never solved my problem with them even with a new dimmer so I just don't use them while listening.
You could fix this yourself, in saying this of course, you will need to also source a new belt for the player ( I can help you there too) That is probably what is preventing the Cd tray from opening. If you where to remove the lid, and give the transport a little assistance in the direction that things initially start moving, then you can be sure that the mechanism is not damaged in any way, and that a lazy belt is the source of you problem.
Do this if you are into fixing it yourself, to see for sure what is happening and we can go from there.
hi, i've had a few nad C541i's and not so long since the sound on one of them cut out for milliseconds and on some occasions the sound would make the noise very much like a severely scratched vinyl record, i thought it was a faulty laser so i tried another KSS-213C laser out of a scrap kenwood and the fault persisted. to cut a long story short, i took the main PCB out and there were various dry joints. once these were resoldered i was blessed with a fully functioning player. hope this helps?
The transport may have been forced out of alignment if jamming mechanically may require removal and reinsertion while in the open position if , but if it appears to not have the "grunt" to drive the drawer from slipping belts, you will need to change the load belts. Belts slipping are preventing the mechanism from operating correctly. Can be a tricky job if you dont do much of this sort of thing, but is within the range of most handyppl.
They are in Aussie, but you can get drive belts for any peice of gear from WES Components by mail order.
well, typical problem i nad cd players, and also receivers by the way.
The proble are tha nad use standard glow lamps. And as we know, the blow!! And often when you move around with the cd. Well i do have repair note for this one also.
go to the menu: 'amplifier repair notes' (yes includes cd players ;) )
Here you can find free amplifier repair notes, an go fore nad 705 repair fix (same fault with defect bulb's as in you nad cd)
And also a technical repair movie showing you the hole process of the 'workaround' this fault i NAD 522 (NAD 501, 502, 512 and more)
best regards michael miguelovitch