Mark,

Thanks for the quick reply!

After I posted my earlier message, I found a discussion in the newsgroup
about the VSX-29TX, which is basically the same model. I think you helped
whoever asked back then also...

Anyway, that discussion set me on the right course (check the DSP board). I
discovered that there is audio present at the board's input, but not its
output. Fortunately, Pioneer did a nice job silk screening the board -- all
the connectors are labeled in a way that makes sense.

I poked around and managed to get the thing to work a few times, in less
than the usual warm-up time. I then looked at the address (or data -- I
don't know) pins on the large PLCC part with my scope (is this the SRAM?
It's Toshiba and marked like a memory) and noticed that it looked like the
DSP is resetting a few times per second, rather than executing continuously
as it should.

If the PLCC device is indeed the SRAM to which you're referring, I can
probably resolder it. If it's the DSP, then I'm in trouble! I don't think
I have any chance resoldering that.

Thanks again!

Jeff

"Mark D. Zacharias" wrote in message
...
There is a known problem on these - a RAM IC needs resoldering. Expect a
recurrence after a year or so. Not for the novice - the foil runs at the
IC
are too easily damaged. It is on the DSP board, but the board is no longer
available - since Pioneer went through all of them for this problem. For a
while Pioneer was exchanging the receiver for a newer model - but I'm
pretty
sure that program would have ended by now.

Mark Z.

--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"Jeff" wrote in message
...
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