[Jack[_11_]]

Jack wrote:
Jack wrote:
Well... after switching channels between the push button input selector
board and the tape monitor board, the bad channel switches from left to
right. This indicates to me that push button switches are the problem.
However, when I use the tape playback inputs on the back of the unit and
flip the appropriate tape monitor flip switch, the problem continues.
The tape monitor switch switches on the tape playback jacks and switches
off all input from the pushbutton switches. I will have to look at the
schematics and try to puzzle out this behavior.

Okay, I totally disconnected the signal wires going from the pushbutton
switch circuit board to the tape monitor switch circuit board and I am
playing from the computer through the tape play back jacks. Both
channels are playing fine at the moment, but being that the problem is
intermittent without any way to induce it (that I know of) I will just
have to wait a see again.

With the two signal wires from the push button switch board disconnected
from the tape monitor switch board, the right channel went out while in
tape monitor mode....(many minutes later) just found a likely suspect...
the -20 db circuit board and the pushbutton switches mounted on it. It
is right next to the push button input switch circuit board and is
dragged down with it when I push down on that board with a chopstick.
The bad channel is much more responsive to pushing down on the -20 db
circuit board than on the push button input switch circuit board, and
pushing the -20 db switch exactly mimics what happens when the channel
goes out... volume on that channel drops way down but is still
responsive to the volume control. I FOUND IT!!!