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Old 7th May 2006, 02:39 PM   #1
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Location: ohio
Default nad 2400 thx amp schematic

Does anyone have a schematic fo a Nad 2400 power amp,I have 3 units with the same problem of not coming out of protections.They do not have any dc offset and no fuses are blown.It seems to be a problem with the protection IC that drives the speaker relays.
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Old 7th May 2006, 03:08 PM   #2
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The service manual for this unit has just been posted on:
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Old 9th May 2006, 11:45 AM   #3
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Default nad 2400

Thanks,I figured out the problem.I had 3 of these to repair for a customer.They were all in protection but had no dc offset.The protection circuit was on because of C817 a 4.7 mfd was leaky.Once audio was applied both channels would go into protection because C818 was leaky a 220mfd.Also C403 and C453 was leaky in the diff amp cause protection with audio applied.In the power supply as preventive measure C810 and C811 was replaced because of open tops of the caps.They get heated up from the nearby regulators.These amps also have alot of bad solder connections that needed to be retouched.Its worth the time to go over the pcb and retouch any connections that appear suspect.
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Old 9th October 2008, 04:56 AM   #4
damage is offline damage  United States
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-1.5V DC offset on Left channel caused protect. Replaced C403 and music was restored.

Obviously, this one is an easy one to do total recap on, just thought I would share.
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Old 25th July 2013, 05:23 AM   #5
Jonas83 is offline Jonas83  Sweden
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I guess there are several differences between 2400 & 2400 thx (?) canīt find any specific 2400 thx but plenty of the 2400. anyone who has the thx service manual scraping around? or know the differances.....
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