Section-5 Maintenance
October 28, 2013
5
‐
18
Copyright
©2013,
Harris
Broadcast
WARNING:
Disconnect
primary
power
prior
to
servicing.
888
‐
2720
‐
001
STEP 4
Set
the
UNIT
POWER
to
the
value
calculated
using
the
formula
described
above.
STEP 5
To
set
the
gain
correctly,
access
to
the
System
Interface
Board
in
each
power
block
will
be
required.
This
is
the
board
located
to
the
right
of
the
power
supplies
behind
the
Unit
Controller
panel.
STEP 6
Notice
on
the
LCD
a
voltage
reading
for
each
power
blocks
forward
and
reflected
power.
Using
S9
(raise)
and
S11
(lower)
on
each
System
Interface
Board,
set
each
power
block
so
the
forward
reading
is
3.49
V.
See
Figure
5
‐
9
for
switch
location.
STEP 7
Set
Dipswitch
S2
(top
of
the
board
on
the
left)
section
8
(far
right
section
of
S2)
to
ON.
This
puts
the
board
in
the
calibration
mode.
Figure 5-9 Power Block System Interface Control Board.
STEP 8
Now
adjust
reflected
S12
(lower)
ad
S13
(raise)
so
the
Reflected
voltage
value
for
forward
and
reflected
(using
forward
and
reflected
for
same
power
block)
match.
Repeat
for
each
power
block.
STEP 9
Set
Dispswitch
S2
‐
8
on
all
power
blocks
to
OFF.
STEP 10
Go
to
Calibrate,
change
to
YES
and
press
Enter.
Once
the
message
DONE
appears,
STEP 11
Calibration
is
complete.
5.7.3
Transmitter Air Flow Calibration
The
following
procedure
is
used
to
calibrate
the
Airflow
in
each
power
block
to
insure
proper
cooling
of
the
transmitter
system.
This
is
done
at
the
factory
prior
to
shipping
and
should
not
have
to
be
done
unless
the
Power
Supply
Interface
board
is
replaced.
The
transmitter
has
variable
speed
fans
and
is
calibrated
at
100%
which
is
full
speed.
Under
normal
conditions
the
fans
will
run
at
about
70
‐
90%,
under
fault
conditions
the
fans
will
ramp
up
to
full
speed.
On
some
older
model
units,
the
fans
were
single
speed
and
do
not
require
calibration.
STEP 1
Be
sure
there
are
no
obstructions
on
the
top
or
back
areas
of
the
transmitter
cabinet.
Periodically
check
the
air
filters
for
dirt
buildup.
It
is
very
important
to
keep
the
filters
clean
at
all
times.
STEP 1
Go
to
SETUP>TX
CALIBRATE>AIRFLOW
SET
STEP 2
To
get
fans
to
run
at
full
speed
a
fault
must
be
created.
The
easiest
way
is
to
pull
one
PA
module
from
its
slot
in
the
power
block
that
is
being
calibrated.
Be
sure
not
to
pull
the
IPA
or
the
transmitter
will
be
off
‐
air.
The
fans
should
ramp
up
to
full
speed.
STEP 3
For
the
power
block
that
is
being
calibrated
only,
go
to
PBx
AIRFLOW
menu.
STEP 4
SET
PBx
100%,
change
to
YES
and
press
enter.
AIRFLOW
CAL
should
read
100%.
STEP 5
Reinstall
the
PA
module
and
fans
should
ramp
down
in
speed.
.
Содержание Flexiva FAX 5KW
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