Gunther Schadow wrote:
Yup, that's how it works with the TU81. Those brackets can be 
easily
 removed by loosening up the screws and lifing the metal
pieces up 
and
 away. Then the side walls can be yanked off by a good
pull straight 
up.
 That's how it appears to be with the HSC initially:
in fact, there 
are
 two similar metal pieces in the front that can be
unfastened and 
pushed
 inward. Yet, after this is done the sidewalls don't
move any 
easier.
 They are stuck as if glued or welded on! This is like a
magic 
chinese
 woodbox. May be there is a magic thing you have to know
so 
everything
 resolves in ease, but so far this transcendental
knowledge has not
been revealed to earthly beings by the gods who dwelleth on the Mt. 
 Manynard or their prophets who service the fields. :-)
        I've not followed this from the start so I don't
        know how deep into the HSC90 you want to
        go, but the steps for upgrading an HSC90 to
        an HSC95 may help.
        1. Power off.
        2. Turn the nylon catches on the card cage cover
             1/4 turn each and pull cover up and out.
        3. Swap modules to taste.
        For removing the rear door:
        1. Open door.
        2. Release hinge pin by pulling down on release lever.
        3. Slide door out and lift up: do not bend bottom pin.
        I've never (knowingly) seen an HSC6x or HSC9x so
        all I can say is that it sounds pretty easy so I
        assume you are doing something other than
        swapping modules?
        The IPB suggests that the side panels "hang" on
        the sides and, once the top is off, will slide upwards
        until they are clear of their "hooks". There may be some
        obvious screws involved too (it's not immediately clear
        whether this is a different cab variant/rev or not).
        Antonio