Electro-Voice 7600 - Electrical; 120 V Ac, 50;60 Hz Power Connections; Installation; Rack Mounting

Operating and Servicing Instructions for the Electro-Voice 7600 Power Amplifier
Figure 1 Top Cover Removal
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 ot¬
her amplifier model is for export
into countries where the ac line
voltage is 100 volts, 50/60 Hz. The
next two sections refer to the first
model with the dual 120 V ac pri¬
mary windings.
1.1 120 V ac, 50/60 Hz
Power Connections
The amplifier is provided
with the primary of the power tra¬
nsformer strapped for 120 V ac op¬
eration from the factory. Refer to
Figure 2a for the wiring details.
WARNING: Verify that the power
transformer's primary 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 requi¬
rements. Use the following proce¬
dures to re-strap the primary of
the power transformer for 220/240
V ac applications.
1. Make sure the amplifier is
not connected to any pow¬
er source.
2. Remove and save the ele¬
ven screws securing the
top cover. There are three
screws on each side and
three along the top-rear
edge of the chassis. In
addition, you must remove
the two innermost screws
inset into the top bumper
strip. Refer to Figure 1 for
the exact screw locations.
3. Locate the barrier strip
mounted on the top-rear
edge of the power trans¬
former. Referring to Figure
2b, reconnect the leads as
shown.
4. Install the top cover with
the eleven screws previous¬
ly removed. Two screws
are longer than the others
removed from the sides
and rear. These longer sc¬
rews install into the rear¬
most position on each side
of the chassis.
5. Install an 8 amp fuse,
Littelfuse Type 3AB
8A/250V slo-blo® 326-
series ceramic body or
equivalent.
2 INSTALLATION
2.1 Rack Mounting
The amplifier may be
installed in a standard 19 inch
equipment rack. It requires 5V*
inches of vertical 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 V entilation
The amplifier must be
adequately ventilated to avoid
excessive temperature rise. It
should not be used in areas where
the ambient temperature exceeds
60 °C (140 °F). To determine the
ambient air temperature, operate
the system in the rack until the
temperature stabilizes. Measure
the ambient air with a bulb-type
thermometer held at the bottom of
the uppermost amplifier. Do not let
the thermometer touch the metal
chassis because the chassis will be
hotter than the ambient air. If the
air temperature exceeds 60 °C (140
Electro-Voice • a Mark IV Company
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