🚀 go-pugleaf

I have a friend who owns a Pioneer SX1980 reciever.  He has had it
in the shop once before (a couple of months back) and had one
channels final amp replaced.  However, now when he uses it (after
it has been turned on for some time) and shuts it off, it will not
come back up and run.  It goes thru some sort of diagnostics before
it will operate (user can see lights come on the front, etc).

My first impression is a heat related problem may be the culpret, so we
cooled it down with an external fan (not too good, since it was not
forced air from inside the cabinet to outside).  So before I go ahead
and tear into it, and use component freeze and a hair dryer to see if
this is it, I thought I would ask all you audio people if anyone either
owns this same piece of equipment and may be  or have had similiar
problems, or if anybody has seen this in other devices.  One other note,
I looked at the equipment the other day.  He does have enough
ventalation (not rack mounted), and it was working earlier in the day.
He also said sometimes it will start to power up (the lights will come
on, but slowly fade out).  The service tech said he "might have a bad
zener".

Please post to sci.electronics, as I am not sure if I can get e-mail.  I
also posted this to rec.audio.  Thanks in advance for any solutions.

Harrison Cooper  N7KSt