NAD 214 Power Amp Fault

Bennyboyph · 14th May 2005, 12:07 AM

The electric supply in my current house is pretty dodgy, bulbs keep blowing etc. Yesterday I was listening to a couple of cds at a quiet volume, when suddenly my NAD 214 power amp just switched off, with a click. Switched the amp off, then switched it back on, and only the red light came on, when normally after a short period of time the amp 'clicks' and a green light takes its place. No such luck. Have you people got any ideas as to what could be wrong?

Cheers!
Ben

anatech · 14th May 2005, 01:06 AM

Hi Ben,
Well, we know the power fuse is good - darn. What test equipment do you have?

At this point, disconnect the amp from everything. Let it sit to discharge caps. Remove the cover and look for some blown fuses.

-Chris

Bennyboyph · 14th May 2005, 01:52 AM

I've got a fairly bog standard digital multimeter and a soldering iron to fix the amp, so that's about it. I can't see any blown fuses inside. There is one fuse near to the front panel power switch, and that's it, other than a black box with DEC written on it, elsewhere in the circuit boards.

Ben

anatech · 14th May 2005, 03:33 AM

Hi Ben,
Time to start measuring DC offset voltages, supply voltages and bias currents to get an idea of what's going on. A schematic would help about now since you're getting into it.

-Chris

14th May 2005, 12:07 AM	#1
Bennyboyph diyAudio Member Join Date: Apr 2005 Location: Manchester	NAD 214 Power Amp Fault The electric supply in my current house is pretty dodgy, bulbs keep blowing etc. Yesterday I was listening to a couple of cds at a quiet volume, when suddenly my NAD 214 power amp just switched off, with a click. Switched the amp off, then switched it back on, and only the red light came on, when normally after a short period of time the amp 'clicks' and a green light takes its place. No such luck. Have you people got any ideas as to what could be wrong? Cheers! Ben

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14th May 2005, 01:06 AM	#2
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Ben, Well, we know the power fuse is good - darn. What test equipment do you have? At this point, disconnect the amp from everything. Let it sit to discharge caps. Remove the cover and look for some blown fuses. -Chris

14th May 2005, 01:52 AM	#3
Bennyboyph diyAudio Member Join Date: Apr 2005 Location: Manchester	I've got a fairly bog standard digital multimeter and a soldering iron to fix the amp, so that's about it. I can't see any blown fuses inside. There is one fuse near to the front panel power switch, and that's it, other than a black box with DEC written on it, elsewhere in the circuit boards. Ben

14th May 2005, 03:33 AM	#4
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Ben, Time to start measuring DC offset voltages, supply voltages and bias currents to get an idea of what's going on. A schematic would help about now since you're getting into it. -Chris

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