3.4.8 - POD Assembly
The POD assembly has been changed since the Kurzweil 250
was originally introduced. The original POD did not have a power
supply that was switchable for different voltages. Therefore, the
internal design for the PODs is quite different'. The only design
difference between the
Kurzweil 250 and the Kurzweil 250X POD is
that the
Kurzweil 250X POD does not have pedals. The power supply
board for the Kurzweil RMX
is
internal to the unit.
The
following is a list of the part numbers for the different
Kurzweil
250 and Kurzweil 250X PODs:
10000301
110V/120V, Kurzweil 250 POD
10000302
220V/240V, Kurzweil
250 POD
10002201
110V/120V, Kurzweil 250X POD
10002202
220V/240V, Kurzweil 250X POD
10002501
Switchable Kurzweil 250 POD
10003001
Switchable Kurzweil 250X POD
The bulk of the POD is the power supply. It contains a 5 volt
supply for the system's
logic circuitry, and a ± 15 volt supply for
the audio circuitry. The newer, switchable
POD contains only one
board.
Another sub-system
in
the POD is a pair of piano-style pedals
for
controlling characteristics of the sound (such as whether notes
are sustained after key release). The
pedals are monitored by a
circuit
on
the "POD board" which sends signals up through a cable
to
the main enclosure. These signals denote whether a pedal
is
up,
down or
in
transit.
The
POD assembly also contains circuitry which monitors the
AC power line and produces an "advance warning"
of
imminent
power failure. This circuitry
is
contained on the POD board
in
the
older, non-switchable
POD assembly. When this pulse is detected,
the instrument saves information about its current state so that it
can resume after power interruption.
Kurzwell 250 Service Manual, Chapter 3
3·40
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