I don't remember if this is the same model, but one of the early players
with a laser diode had a problem with the switch that determined whether
an
LV or CD was inserted. If you played a CD, the unit would then refuse to
play an LV, until you took off the cover and manually reset the
mechanism
(flipped the tray).
good thought.
i believe i am on side #1. w/a laser disc installed pressing button
for side#2 lights the indicator but nothing happens mechanically. both
lights remain lit.
i wonder which screws i need to remove to seperate the mechanical
assembly from the top of the boards.
thats because there's no removeable bottom plate under the boards for
me to take voltage readings.

For what I suggest, you need only remove the top cover.