After one minute aproximately, the left channel dies! A while
after that there is noise and problems with both channels turning on
The player is a NAD C542, and I am entirely responsible for the fault,
as I have been tampering around with it, upgrading certain capacitors,
etc. All well advised modifications according to certain internet
forums where knowledgeable people share their modding experiences. I am
not unqualified to make these modifications, I know how to solder and
have a basic understanding about electronics and such, but I am not
educated enough to diagnose exactly what might be causing this problem.
What do you think, what does this sound like?
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There is a diode in the power supply which gives dc supply to the laser focusing coil driver ic . if the diode get faulty this problem can occur. Just replace all the rectifier diodes in the power supply stage. Its better than searching for the exact one. then check the cd player is it skips the tracks. if then also its skips the tracks then you have to change the laser pickup unit.
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?
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.
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