Service manual

1.
B.
MS-400A
Description?
The
MS-400A
is
designed
for
applications
Controls
which
affect
the
input
and
in
which
a person
needs
to
communicate
output
at
the
station
(mic,
headsets,
with
up
to
four
other
people
or
groups
speaker,
and
program)
are
located
in
a
i
of
people,
either
individually
or
row
along
the
upper
right
of
the
front
simultaneously,
while
still
maintaining
panel.
Controls
that
are
recessed
be-
isolation
between
each
of
the
four
hind
the
front
panel
are
normally
used
channels.
only
during
installation
and
set-up.
The
MS-400A
is
self-powered,
and
can
On
the
rear
panel,
three
XLR
connectors
also
power
up
to
20
speaker
stations
or
for
each
channel
allows
easy
connection
100
headset
stations.
It
is
normally
to
the
rest
of
the
system.
A
program
used
as
a
main
station
(which
provides
(auxiliary)
input
on
the
rear
panel
system
termination
at
a
central
loca-
allows
an
external
program
to
be
moni-
tion),
but
may
be
used
also
as
a
remote
tored
at
the
station
and/or
sent
onto
station
that
provides
extra
power
capa-
one
or
more
of
the
intercom
channels.
city.
Its
preamp
gain
is
switchable
for
mic
or
line-level
inputs.
Access
to
the
channels
is
controlled
by
the
row
of
pushbutton
and
toggle
swit-
Special
functions
ISO
and
IFB
may
be
set
ches
along
the
bottom
right
side
of
the
up
with
internal
jumpers.
See
Section
front
panel.
Separate
controls
for
talk
III
for
a
detailed
discussion
of
all
con-
and
listen
for
each
channel
enhance
the
trols
and
jumpers.
0
I
station's
versatility.
0
2