User Manual
ADCP-75-150 • Preliminary Issue A • March 2003 • Section 5: Maintenance
Page 5-16
©
2003,
ADC
Telecommunications,
Inc.
Figure 5-3. Removing Host Unit Fans From Grill
8. Remove
both
fans
from
the
grill
9. Use
the
rivets
removed
in
step
7
to
secure
the
replacement
fans
to
the
grill.
Orient
each
fan
so
the
wiring
harness
is
on
the
top
and
the
arrow
on
the
fan
points
into
the
enclosure.
10. Connect
the
two
wiring
harness
connectors
to
the
circuit
board
connectors.
11. Secure
the
fan/grill
assembly
to
the
side
of
the
enclosure
(see
Figure 5-2)
using
the
six
flat-head
screws
removed
in
step
4.
12. Place
the
HU
On/Off
switch
in
the
ON
position
(press
I).
13. Verify
that
the
fans
run
properly
following
power-up.
14. Notify
the
NOC
or
alarm
monitoring
system
operator
that
the
system
is
going
back
online.
5.4 Spectrum Transport Module Fan Replacement Procedure
The
STM
is
equipped
with
a
rear
cooling
fan
that
exhausts
heated
air
from
the
STM
enclosure.
Cool
air
enters
the
STM
through
vent
openings
on
the
side
of
the
enclosure.
Replacement
of
the
fan
requires
that
the
STM
be
turned
off
for
a
short
period
of
time
and
that
the
STM
be
removed
from
the
cabinet.
Use
the
following
procedure
to
remove
and
replace
the
STM
cooling
fan.
1. Before
working
on
the
STM
or
handling
a
fan,
slip
on
an
Electro-Static
Discharge
(ESD)
wrist
strap
and
connect
the
ground
wire
to
an
earth
ground
source.
Wear
the
ESD
wrist
strap
while
completing
each
section
of
the
fan
installation
procedure.
2. Notify
the
NOC
or
alarm
monitoring
system
operator
that
the
system
is
going
offline.
3. Place
the
STM
On/Off
switch
in
the
OFF
position
(press
O).
4. Disconnect
the
various
power,
fiber
optic,
service,
alarm
wiring,
and
coaxial
cable
connectors
from
the
STM
front
panel
as
specified
in
Figure 5-4.
Warning:
Electronic
components
can
be
damaged
by
static
electrical
discharge.
To
prevent
ESD
damage,
always
wear
an
ESD
wrist
strap
when
working
on
the
HU,
STM,
or
LPA
and
when
handling
electronic
components.
16173-B