Altec Lansing 902 Series Technical Instructions
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Brand: Altec Lansing
Category: Controller , DC Drives , Speakers
Type: Technical instructions
Model: Altec Lansing 902 Series , Altec Lansing 902-16A , Altec Lansing 902-S , Altec Lansing 902-SA , Altec Lansing 908 Series
Pages: 2
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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 .
COV 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 HING 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 AND
VOICE COIL
ASSEMBLY
INTERNAL
BIN DING
POSTS
FELT DISC
ATTACHING
SCREWS
Figure 3. Models 902-BA and !902-16A
6. Carefully work diaphragm and voice coil
assembly free. Remove assembly (see
Figure 4).
CAIJTlON : THE DIAPHRAGM IS
EXTREMELY DELICA TE. USE
CARE TO PREVENT DAMAGE .
AVOI D PHYSICA L CONTAC T
WITH DIA PHRAGM . KEEP SCREW•
DRIVER AWA Y. AS STRONG M.AG·
NETI C FIELD MAY ATTRACT
SCREWDRIVER INT O
DIA PHRAGM .
Figure 4. Diaphragm and Voic e
Coil Assembly
7. Clean foreign mater ial 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 on s a nd comp o nen ts s uhj <,ct tu c ha n l{e wi th o ut
noti ce . Ov ('r<JII pP rfu rmon ce will he maintain ed or imp roved .
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