NAD 2100 protection on!

jerryo · 18th August 2011, 01:24 PM

Hi,
I have a NAD 2100 amp that only switches on with the "protection" light on.
Inside reveals no burnt components and the fuses are still intact so where should I be looking for a fault. I have the service manual so will start continuity testing and resistor checking when I have time.
I just need a push in the right direction by those who might have an idea where to look.

Many thanks

Jerry

trainman94 · 4th September 2011, 06:32 PM

Hi,
I have the same problem with mine. Have not yet resolved the issue.
Check the voltage s at R471 and R 472. If one is at supply voltage that channel may be at fault .
Q 605/606 are the protection circuit. that control the speaker relays. Let me know if you find a solution.

Horace

jerryo · 1st October 2011, 03:20 PM

Hi trainman94,
I don't know about you but I have no-one locally who repairs amps so I am on my own on this one.

Protection light comes on upon switch on and goes out after it warms up.

The symptoms I have are as follows; one channel has centre voltage of 81mv
(0v +/- 100mv) and idle voltage of 16mv (15mv....+/- 2.5mv)
Other channel has centre voltage of 0.6v (!) and idle of 6.4mv which cannot be adjusted; although if you go to turn the idle up the protection kicks in and if you turn it back down it turns off again.
Relays both work with protection. Fuses fine and everthing else looks normal.

If you or anyone else has any ideas where to go next I would really appreciate some help so I can save this amp.

Cheers

18th August 2011, 01:24 PM	#1
jerryo diyAudio Member Join Date: Jun 2007	NAD 2100 protection on! Hi, I have a NAD 2100 amp that only switches on with the "protection" light on. Inside reveals no burnt components and the fuses are still intact so where should I be looking for a fault. I have the service manual so will start continuity testing and resistor checking when I have time. I just need a push in the right direction by those who might have an idea where to look. Many thanks Jerry

4th September 2011, 06:32 PM	#2
trainman94 diyAudio Member Join Date: Sep 2011	nad 2100 Hi, I have the same problem with mine. Have not yet resolved the issue. Check the voltage s at R471 and R 472. If one is at supply voltage that channel may be at fault . Q 605/606 are the protection circuit. that control the speaker relays. Let me know if you find a solution. Horace

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1st October 2011, 03:20 PM	#3
jerryo diyAudio Member Join Date: Jun 2007	Hi trainman94, I don't know about you but I have no-one locally who repairs amps so I am on my own on this one. Protection light comes on upon switch on and goes out after it warms up. The symptoms I have are as follows; one channel has centre voltage of 81mv (0v +/- 100mv) and idle voltage of 16mv (15mv....+/- 2.5mv) Other channel has centre voltage of 0.6v (!) and idle of 6.4mv which cannot be adjusted; although if you go to turn the idle up the protection kicks in and if you turn it back down it turns off again. Relays both work with protection. Fuses fine and everthing else looks normal. If you or anyone else has any ideas where to go next I would really appreciate some help so I can save this amp. Cheers

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