I have a Pioneer VSX-27TX receiver that works fine in all respects except
that it takes about 20 minutes before audio can be heard from any of the
outputs (main or surround.) During the 20 minute "warm-up", the display is
active and all control functions of the receiver seem to work. I can use
the tuner, select inputs, enable/disable surround modes, use the remote
control, etc. Also, signal is present at the tape output during this time,
but not at the preamp outputs.

Once 20 minutes (or so) has passed, the audio almost suddenly starts
playing.

Whatever is wrong, it seems to be temperature related, as the "warm-up" time
is shorter if I cycle power after the receiver has been on for a while.

Has anyone seen similar behavior from this unit? Any tips as to what might
be wrong? Does anyone have a schematic for this model?

Thanks,

Jeff