Question about NAD C315BEE 2Channel Amplifier
The amp seems to be working. However, when playing a CD through the matching C515BEE player, the output loudness initializes to approximately 85% on startup, and cannot be turned down, by means of either the NAD remote or manually. Turning the volume up does increase the output sightly to maximum. This fault occurred after changing speakers with the amp and CD player turned off using the remotes (Standby mode), but not unplugged. Has the amp gone into "protect" mode, and if so, how do I reset it? I find it curious that I still have output, just not controllable output. Any helpful info or suggestions would be much appreciated. Thanks.
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: nad 302 amplifier
sounds to me that the vol control has lost its earth end connection So yes its a problem with the dial control You couls try some contact cleaner But better still lift of the lid and base if possible while the amplifier is not plugged into the power socket and see if you have a dry joints around the vol control pot regards Trev
Posted on Mar 14, 2007
SOURCE: Nad c372 Remote Control
I have had the same problem which required a replacement motorised pot. I've also had a small cap fitted next to the heatsink on the positive rail regulated supply transistor go pop! Bad smell, protection circuitry operates.
Great amp, great design, poor quality assembly and QC. NAD need to lift their game!
(30 years electronic repair industry)
Posted on Jan 06, 2008
SOURCE: Nad C370
Since the problem seems to be sensitive to the volume level, I would be looking at the output wave form for any DC current. Although the protection circuit should detect any DC present, it is possible that some is leaking through. Also, verify that the speaker impedence is correct. If the amp is seeing too low an impedence load, it will work too hard causing excessive heat which will shutdown the unit as well.
Keep me posted.
Posted on Nov 05, 2008
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