5.6.3 - CPU
Board
To remove the CPU board, it is necessary to disco"mect all
cables connected to the CPU. There are 3 flat ribbon cables to be
removed:
1 from' the CGP board, one1from the Channel board and one
ribbon cable that connects the
CPU to the Front Panel board Next,
remove the two brown power connectors and the
MIDI cable located
next to the rear panel on the
CPU. Now it is necessary to remove the
4 fastening nuts securing the four
1/4 inch phone jacks to the rear
panel. Then' remove the 13 phillips· head screws which mount the
CPU to the inner chassis.
5.6.4 -
Replacing
RMX
Engine
EPROMs
Remove the 4 phillips head screws from each side of the shelf
containing the Channel board. Lift the shelf
slightly.
You will not
be able to use
an
EPROM puller as there
is
not enough clearance. You
can use a long thin flat head screwdriver. Please be careful not to
damage p.c. board or sockets while doing this.
5.6.5 - CGP
Board
To
remove the CGP board, it will be necessary to remove 6
cables. Two from the
CGP board to the Channel board, two from the
CGP board to the CPU board, one from the power connector to the CGP
board and one long flat ribbon cable that from the CPU to the Channel
board. Once the cables have been disconnected, remove the
13
phillips head screws holding the CGP to the chassis.
5.6.6 -
Power
Supply
Assembly
The Power Supply board is attached to the Channel Board
on
the
inner shelf and is enclosed
in
a metal shield. Depending on the
repair you are performing it
mayor
may not be necessary to remove
the top portion
of
the Power Supply enclosure. If you are replacing
the Power
Supply board, it will be necessary to remove the 6
phillips head screws securing the top enclosure, disconnect the wire
terminals going to the Power
Supply board from the interal harness
cable and then remove the 7 phillips head screws securing the Power
Supply board to the 'bottom portion of the enclosure (see Chapter 7
for RMX Wiring Diagram).
Kurzwell 250 Service Manual, Chapter 5
5·1
5
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