High Voltage Section
The High voltage section of the ALS-600SPS uses high current switching circuit with
superior filtering to produce a high current DC voltage. This line is protected by F1 on
the printed circuit board.
Primary Circuit
A 10 ohm resistor limits the line current during start-up, which lowers the stress on the
power supply components. When the –14 volt control line approaches full voltage, a
relay bypasses the 10 ohm resistor and applies full line voltage to the primary. The 10
ohm resistor is protected from supply shorts by a 2 amp slow blow fuse during start-up.
An input over-current circuit will disable the power supply at approximately 16 amps of
input AC current.
The primary circuits are fused by two fuses located on the back panel of the switching
power supply. The fuses are rated at 15 amps on 120 volts, or 8 amps on 240 volts.
Low Voltage Circuits
The low voltage power supply sections supply 14 volts positive at 2 amperes maximum
for control of lights, bias voltage regulator and the Bias/Wattmeter board in the ALS-600.
A separate 12 volts negative supply is used to operate inrush relay and the ALC circuit of
the ALS-600.
INSTALLATION
Amplifier Location
Do not locate this amplifier in excessively warm locations, near heating vents or near
radiators. Be sure that air can circulate freely around and through the amplifier cabinet.
Do not obstruct the air inlets at the rear of the amplifier and the outlet air holes on the
lower right side of the amplifier cabinet.
The best location for the amplifier is one that allows the meters to be easily read and the
controls accessed during operation. The length of the interconnecting control and ALC
cables are not critical. These should be made from good quality shielded cables. Low
level audio cables, sold for use with home theater equipment, are ideal. The RF input and
output cables should be kept as short as possible.
Power Supply Location
The best location for the power supply is one that is away from devices that are sensitive
to magnetic fields. The meter should be visible and fuses should be accessible for
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