Power Problem With NAD 7100 Receiver
Paul Kapelanski
The power to my home "bounced" due to a storm. Now my NAD 7100 receiver is
dead. No lights - won't power up. Internal fuses look good. I had this
same type of situation years ago. I had given up on the box figuring it was
a victim of a power surge & threw in the corner for latter repair. I didn't
get to it for awhile & when I finally plugged it back in it powered up fine.
Is it possible there is some protection feature that is locking out the
power switch? Is there a reset somewhere or do I just have to wait & if so
how long? Any help would be greatly appreciated. Thanks.
Jerry G.
trace through the path of the volts through the powersupply and see
where it is stopping.
That is the approach I would take. This way you will be sure to find
where the failure area is.
--
Jerry Greenberg
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Electronic Components, And Navigation Compasses
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"Paul Kapelanski" <kapel...@prodigy.net> wrote in message
news:8lvf5u$24fo$1...@newssvr03-int.news.prodigy.com...
TIM SCHWARTZ
>
> The power to my home "bounced" due to a storm. Now my NAD 7100 receiver is
> dead. No lights - won't power up. Internal fuses look good. I had this
> same type of situation years ago. I had given up on the box figuring it was
> a victim of a power surge & threw in the corner for latter repair. I didn't
> get to it for awhile & when I finally plugged it back in it powered up fine.
> Is it possible there is some protection feature that is locking out the
> power switch? Is there a reset somewhere or do I just have to wait & if so
> how long? Any help would be greatly appreciated. Thanks.
There is a NAD service bulletin on this. I quote:
Ocasionally, you may recieve a complaint of logic lockup- the controller
IC is completely unresponsive to commands, both via the front panel and
via the remote controller- but works OK after being unplugged for a
while. It will also work fine in the shop, of course.
This is caused by brief power line voltage dips, which trigger the
controller IC's 'standby' mode but not its 'reset' mode. In effect the
IC is asleep.
To cure this simply remove Q804 (and disgard it), which is located
below the FM switch on the controller PCB, behine the faceplate.
After modifcation, brief voltage dips are ignored, and longer ones
reset the IC to initial state, as when first plugged in.
The service bulletin is dated 10-1-91 from NAD's distributorat the
time, Lincolnwood. As I recall GETTING to the transistor is the
hardest part.
Regards,
Tim Schwartz
Bristol Electronics (an authorized NAD servicer)