On Tue, 6 Nov 2012 23:31:14 +0000 (UTC), in sci.electronics.repair you wrote:
SNIP
there is generally a crappy leaf type switch to sense with the door is
open. try burnishing it with some paper.

does the unit open all the way, then pause and close or just close
instantly? It may have no idea when it reached end of travel.

Hi,

The tray opens all the way, then immediately closes.

Regarding the leaf switch or other type, did you notice this part of my
post: " Note: I was in consumer electronics service for many years."
Don't you think I looked for such a switch?

One thing I forgot to say, I do NOT have a service manual for
this unit.

Revised Question:

Did anyone have this exact same problem with this same brand and model DVD
player and repaired it?

Thank You in advance, John