FAX 5/10/20/30/40KW
October 28, 2013
5
‐
23
888
‐
2720
‐
001
WARNING:
Disconnect
primary
power
prior
to
servicing.
Copyright
©2013,
Harris
Broadcast
Figure 5-11 PA Backplane Boards
STEP 7
Note
where
all
the
wires
are
located,
ensure
that
they
go
back
to
the
same
location
when
re
‐
assembling
the
unit.
STEP 8
Remove
the
ribbon
cable,
DC
Power
cables
and
RF
connectors
from
the
backplane
being
replaced.
STEP 9
Using
a
small
phillips
screwdriver,
remove
the
nine
silver
screws
from
the
backplane.
Lift
the
backplane
from
the
cabinet.
Note
Do not remove any brass screws.
STEP 10
Set
the
dipswitch
on
the
new
board
to
match
the
board
just
removed.
STEP 11
Install
the
new
backplane
into
the
transmitter
and
secure
with
the
nine
screws.
STEP 12
Replace
the
RF
cables,
DC
power
Cables
and
the
ribbon
cable
to
the
same
location
they
were
removed
from.
STEP 13
Re
‐
install
the
Splitter/Reject
load
assembly
to
the
right
side
wall
on
the
transmitter.
STEP 14
Re
‐
connect
the
coaxes
to
the
14
‐
way
combiner.
STEP 15
Re
‐
install
PA
modules
and
turn
transmitter
ON.
5.8.2
System Interface Control Board Replacement
The
following
instructions
explain
how
to
replace
a
System
Interface
Control
PWA
including
the
correct
setting
of
all
PWA
switches.
The
high
power
Flexiva
FAX
series
of
transmitters
all
use
the
same
System
Interface
Control
PWA.
In
the
10kW
Transmitter
and
10kW
Power
Block,
the
System
Interface
Module
is
located
on
the
right
end
of
the
Power
Supply
Modules.
In
the
20kW/30kW/40kW
Transmitters,
a
second
Interface
Module
is
utilized
in
the
Primary
Power
Block
and
it
is
called
the
Multi
Unit
System
Interface
Module.
The
Multi
Unit
Module
interfaces
with
all
of
the
other
System
Interface
Modules
in
each
Power
Block.
The
hardware
for
each
is
identical,
the
difference
is
the
switch
settings
that
determine
of
the
board
is
a
power
block
controller
or
a
system
controller.
The
replacement
Rev
“E”
or
higher
PWA
is
universal
which
means
it
can
be
used
in
either
location
and
will
replace
older
versions
of
the
same
PWA,
however
do
not
set
the
dipswiches
to
match
earlier
version
boards
as
some
new
parameters
have
been
added.
Dipswitch
settings
are
used
to
designate
which
Power
Block
and
position
the
PWA
will
be
used.
Dipswitch
settings
are
also
used
to
identify
which
Harris
Broadcast
Exciter
is
being
utilized
in
the
system.
Please
see
section
5.4.4
for
guidance
on
proper
settings
for
your
model
FAX
transmitter.
Figure
5
‐
17
above
Summary of Contents for Flexiva FAX 5KW
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