Question about NAD L40 CD Player
My NAD L40 is about 5 years old, and it works fine, but since a month or so it has been making a high pitch sound whenever it is turned on, the sound is not very loud, but it is annoying. I have even unplugged the speakers and everything connected to the receiver (aux input), and the sound is still there. This is regardless of the input (CD, AUX, TAPE, TUNER).
I hav had the same problem (probably). It is a smal chopping powersuply to power the backlight of the lcd-display. It's a small pc-board mounted at the rear of the cd-cabinet, just next to the mains-power-transformer. It can be easyiely disconnected by unplugging the 3-pole connector from the mother-board, and the sound will be gone. However the display readout will faint down then, but its still readable. The higher serial-numbers don't have this problem, so an exchange of the small pc-board might be the best solution.
Posted on Feb 03, 2008
1.the problem with your audio processing circuits and improper power filter
2. Check audio amplifier coupling capacitors
3. Rectifier capacitors
4. contact service centre
Posted on Dec 22, 2007
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