Altec Lansing 9441A - Manual (Page 3)

Operating and Service Instructions for the Altec Lansing 9441A Power Amplifier
1 ELECTRICAL
Two amplifier models are
available. One model has a 50/60
Hz power transformer with two
120 V ac primary windings. These
windings may be wired in parallel
or series for operation at either
120 V ac or 220/240 V ac. The
other amplifier model is for export
into countries where tlie ac line
voltage is 100 volts, 50/60 Hz. The
next two sections refer to the first
model witli the dual 120 V ac pri­
mary windings.
1.1 120 V ac, 50/60 Hz
Power Coimections
'rhe amplifier is provided
with the primary of the power
transformer slrappcil for 120 V ac
operation from the factory. Refer
to Figure 2 for the wirijjg deUiils.
WARNING: Verify that the power
transformer’s priinaiy circuit con­
figuration is correct for the in­
tended ac line voltage BEFORE
applying power to the amplifier.
1.2 220/240 V ac, 50/60 Hz
Power Connections
The power transformer
has two 120 volt primary windings
which can be connected in parallel
for 120 V ac line voltages, or in
series to meet 220/240 V ac re­
quirements. Use the following
procetlures to re-strap the primary
of the power transformer for
220/240 V ac applications.
1. Malce sure the amplifier is
not connected to any
power source.
2. Remove and save the ten
screws securing the top
cover. Refer to Figure 1
for the exact screw loca­
tions.
3. Locate terminal block TBl
located behind the AC
main power switch. Re­
connect the leads as
shown in Figure 2.
4.
5.
6 .
Install the top cover with
the ten screws previously
romovetl.
Install the 2.0 A fuse,
T2.0A /250V slo-blo or
equivalent.
Install the 230 Vac 50/-
60Hz and the T2.0A/250V
decals
in the proper
positions.
INSTALLATION
2.1 Rack Mounting
The amplifier may be in­
stalled in a standard 19 inch
equipment rack. It requires 1.75
inches of vortical rack space and
secures to the rack cabinet with
the-four rack mount screws and
cup washers provided in the hard­
ware kit.
2.2 Ventilation
The amplifier m.;;;t be
adequately vontil.ntod tn ir.'oid ex­
cessive temjjerature rise, i si;ould
not be used in areas where the
ambient temperature exceeds SO'C
(122°F). To determine i .imbi-
ent air temperature, opemte the
system in the rack until the tem­
perature stabilizes. Mea'"ro the
ambient air with a bulb-type ther­
mometer held at the botloin of the
uppermost amplifier. Dc tmt let
the thermometer touch the netal
chassis because the chassis will be
hotter than the ambient a:.-. If the
air temperature exceerls 50°C
(122°F), the equipment siiould be
spaced at least 1.75 inches apart
or a blower installed to provide
sufficient air movement within
the cabinet.
WARNING: Do not operate the
amplifier within a completely
closed unventilated housing.
ALTEC LANSING* CORPORATION • a Mark IV Company