User Manual

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ADCP-75-126 • Issue B • April 2002 • Section 5: Maintenance

Page 5-18

©

2002,

ADC

Telecommunications,

Inc.

5. Loosen

the

captive

screws

that

secure

the

STM

to

the

RU

cabinet

mounting

shelf

and

carefully

withdraw

the

STM

from

the

cabinet.

6. Remove

the

four

pan-head

screws

(requires

TORX

screwdriver

with

T10

bit)

that

secure

the

fan/grill

assembly

to

rear

side

of

the

STM

enclosure

as

shown

in

Figure 5-5.

Save

screws

for

reuse.

Figure 5-5. STM Fan/Grill Assembly Removal

7. Carefully

withdraw

the

fan/grill

assembly

from

the

enclosure

until

the

wiring

harness

is

exposed

and

the

connector

is

accessible.

8. Lift

the

small

latch

on

the

wiring

harness

connector

and

carefully

unplug

the

connector

from

the

circuit

board

connector.

9. Remove

the

plastic

rivets

that

secure

the

fan

to

the

mounting

plate

and

grill

by

pushing

outward

on

the

rivet

center

post

until

the

rivet

can

be

withdrawn

as

shown

in

Figure 5-6.

10. Separate

fan

from

the

mounting

plate

and

grill

11. Use

the

rivets

removed

in

step

9

to

secure

the

replacement

fan

to

the

mounting

plate

and

grill.

Orient

the

fan

so

the

wiring

harness

is

on

the

top

and

the

arrow

on

the

fan

points

away

from

the

enclosure.

Make

certain

the

rubber

grommets

are

left

in

place

on

the

mounting

plate.

12. Connect

the

wiring

harness

connector

to

the

circuit

board

connector.

13. Secure

the

fan/grill

assembly

to

the

back

of

the

enclosure

(see

Figure 5-5)

using

the

four

pan-head

screws

removed

in

step

6.

Do

not

overtighten

the

screws.

The

screw

threads

can

be

easily

stripped

if

too

much

torque

is

used

to

tighten

the

screws.

16992-A