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DIAPHRAGM AND VOICE COIL
ASSEMBLY REPLACEMENT FOR
DRIVERS
The diaphragm
and
voice coil assembly
in
HF
drivers
is extremely delicate and must
be
handled
with
care
.
Prior to starting the
replacement procedure, select a work area
that is clean and free from iron dust or
chips.
Cover
the
surface
with a few layers
of
clean paper
.
The area must be free from
drafts to prevent iron dust particles
in
the
air from being
magnetical
ly
attracted to and
lodged
in the voice coil gap of the HF driver.
Replace
the diaphragm and voice coil as-
sembly
in
accordance
with the following
procedures.
1.
Remove leads from external
binding
posts (see Figure
1). Note electrical
phasing (polarity) as leads are removed
.
CO
V
ER
EXTE
RNA
L
BINDING
POSTS
Figure 1. Typical Driver
2. As appropriate
to
the
installation
,
remove driver loudspeaker and/or horn
from enclosure or mounting,
and take
removed
assembly
to prepared
work
area
.
NOTE------~
Where easy
access
to the driver is
available,
the replacement procedure
may
be
completed
without removing
the
driver
loudspeaker
and/or
horn
.
ALTEC
902 AND 908 SERIES
HF DRIVERS
LANSING'
TECHNICAL
INSTRUCTIONS
DIAPHRAGM AND VOICE
COIL
REPLACEMENT
PREVENTION OF
STATIC
AND RF CHARGE
3.
Remove
screws
securing
driver cover
(see Figure
1).
4.
Lift
cover from driver and remove two
leads
from
internal binding posts;
set
cover aside
.
Note that Model 902-BT
is
equipped
with
an
aco
ustical
loading cap
(Figure 2); Models 902-BA, 902-16A and
908-BA are provided with an acoustical
absorbent felt disc (Figure 3),
instead
of
a loading
cap
.
.-------
CAUTION ------
The diaphragm is extremely delicate.
Use
care to prevent damage. Avoid
physical
contact
with
diaphragm.
Keep
screwdriver
away, as strong
magnetic
field
may
attract
screw-
driver
into
diaphragm
.
ATTAC
HIN
G SCREWS
INTERNAL
BIN
DING
POSTS
Figure 2. Model 902-BT
Driver
5. Remove three screws securing
acousti
-
cal
loading
cap (Figure 2), or
diaphragm
and voice coil assembly (Figure
3).
For
Model 902-BT,
set aside loading
cap.
DIAPHRAGM AN
D
VOIC
E
CO
IL
ASS EMB LY
INTERNAL
BIN DING
POSTS
FELT
DISC
ATTA CHING
SCREWS
Figure 3.
Models 902-BA and
!902-16A
6. Carefully
work
diaphragm and voice
coil
assembly
free.
Rem
ove
assembly (see
Figure 4).
CA IJTlON
:
THE DIAP HRAG
M
IS
EXTREMEL
Y DELICA
TE.
USE
CARE TO PREV
ENT
DAMAGE
.
AVOI
D PHYSICA
L
CO NTAC
T
WITH
DIA
PHRAGM
.
KEEP SCREW•
DRIVE
R
AWA Y. AS
STRONG
M.A
G·
NETI
C
FIELD M
AY ATTRACT
SC REW
DRIVE
R
INT
O
DIA PHRA
GM
.
Figure
4.
Diaphragm
and
Voic
e
Coil Assembly
7. Clean
foreign
mater
ia
l
from voice coil
gap with
a short
strip
of masking tape
one-inch wide
.
Fold
tape back to form a
strip
with adhesive
exposed
on both
S'p
ecif ica
ti
o
n
s
a
n
d co
mp
o
n
e
n
t
s s
uhj
<,
ct
t
u
c
ha
n
l{e
wi
th
o
ut
no
ti
ce
.
Ov ('
r<J
I I
pP rfu
rmon
c
e
w
ill
he
maintain ed
or imp roved
.
1515
S. Manchester Ave., Anaheim,
Ca!if
.
92803
42·02·035169-01
SUBURBAN
PRINTING
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