"chuck" wrote in message
...
On Tue, 15 Jan 2013 06:50:24 -0800 (PST), j
wrote:
I'm trying to troubleshoot a 1980'2 era Nak receiver that has pushbutton
input switching via a microprocessor (can also be remote controlled). The
button lights don't work, and I get no input connections at all. Strange,
but the micro works, controlling the volume up and down. Also, the amp
works via the pre-out and power-in jumpers. Apparently, some aspect of
the switching (done via an analog switch IC) is screwed up. Anyone have
ideas on how to troubleshoot this?
I would first check the electrolytic caps in the power supply. Noise
on the B+ lines will cause all matter of digital problems with this
model. Chuck
I was able to download a service manual from Elektrotanya.
The site is difficult to access if you don't speak Hungarian but I can email
you the manual.
email me at:
and reverse "labolgcbs" to read "sbcglobal".
Mark Z.