Kurzweil K250 - Keyboard Assembly and Maintenance

5.3 - KEYBOARD ASSEMBLY
5.3.1 - Accessing the Keyboard
You can remove all the K250 wooden key~, except the two end
keys, by simply opening the Front Panel assembly as previoulsy
described. The two keys that cannot
be removed are the' ones at each
end of the keyboard. These keys can only be removed if the top
enclosure is off.
5.3.2 -
Accessing the Keyswitch Board Assemblies
Should you need to remove, replace or adjust the Keyswitch
board assemblies, disconnecting the top and bottom enclosures
is
required. When disconnecting the top from the bottom enclosure for
this purpose, removing the Front Panel assembly is not required.
Simply disconnect the ribbon cables coming from the CPU and
Channel boards
to the Keyswitch and Front Panel assemblies. These
cables can easily be accessed once the slide chassis is opened.
Once you have disconnected the top from the bottom enclosure
and disconnected the cables, the Keyswitch board assemblies can be
accessed.
There
are' two Keyswitch board assemblies, each consisting of
a set of 44 leaf switches
and a printed circuit board. A Keyswitch
board assembly is
always treated as a unit; you do not have to
disassemble. The Keyswitch board assemblies are mounted on a
bracket which screws into the action assembly. To remove a
Keyswitch board assembly,
loosen the four mounting screws and lift
the assembly up (vertically) off the action assembly. Be careful to
slide it up off the mounting screws since pulling the assembly out
horizontally may strip the screws.
Kurzwell 250 Service Manual, Chapter 5
5·7