In article ,
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?


Did Nakamichi do the thing with the button lights that they did on some
other units? (The lights were used as the pullup resistors in the matrix
scanned keyboard or something strange like that).

Mark Zenier
Googleproofaddress(account:mzenier provider:eskimo domain:com)