Just got my third JVC RX-515V in the mail
today - fully functional, but with same
problem:

The smaller PC board perpendicular to the
mother board connection has eroded over
21 years. Out of the box, no center channel
in pro-logic mode. After some wiggle and
tapping, it worked.


So what I will do is use this RX Receiver as
a stereo only for all my analogs, and feed tape
1 out to a modern digital X.1 surround receiver
with pro-logic for surround from 2-ch sources.