The Channel board required the installation of U60, part" no.
63001201.
Some units did not. have a socket at this location;
and, therefore, required the addition of that socket. This
socket was supplied with the kit. Kurzweil never recommends
that this part is soldered into
the board. It was also required
to check values of certain resistors
and
capacitors on the
Channel board and the addi-tion or replacement of these parts.
The Audio board needed
to
be
replaced for any unit produced
prior to February of 1985. Therefore, Kurzweil offers two
Sound Modeling Program kits, one with Audio board and one
without. (Kurzweil offers these kits at the same cost.) The
part number of the Audio board required for
Sound Modeling
Program is 12011001. Some boards may not actually have this
part number printed
on
it, but will have the correct p.c. board
fabrication number, 33011001. The old Audio board that needs
to
be
removed is part no. 12001001 or
p.
c.
board fabrication
no. 33001001.
2.3 - May, 1985
Sound
Block
A--purchased option
The
Sound
Block
A board was offered under three part
numbers 14000801, 14000802 or14001301. Although there was
no
difference
in
the Sound Block A board itself, this was done as a
result of the K250s
in
the field. Older K250s did not have a series
of modifications to the
CGP board required for Sound Block
A.
For
these units, Kurzweil offered kit part number 14000801. This
included
an
updated CGP board
as
well as the Sound Block A board.
The old
CGP was to be returned to Kurzweil or the customer was
invoiced for the board.
Part number 14000802 was used for
customers who sent
in
their CGP board to be updated at Kurzweil.
Once the update was completed Kurzweil returned the CGP board
with a
Sound Block A board attached. This update
to
the
CGP
board
was done free of charge.
Part number 14001301 was just the Sound
Block A board sent
to
be installed
on
CGP
boards that did not require
any modification.
Kurzweil
250
Service Manual, Chapter 2
2 - 4
.r
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