Dc Power Operation - Toa A-503A Operating Instructions Manual

Output Connections
Tape output
A tape recorder may be driven from the Tape output jack on the
amplifier. In this case, the output is not subject to the volume or tone
setting of the amplifier and is controlled at the tape recorder. A patch
cable terminated in a. standard pin plug is connected between the
Tape output jack on the amplifier and the input of the tape recorder.
Booster output
A booster amplifier may be driven from the Booster output jack on
the amplifier. In this case, the output is not subject to the volume or
tone setting of the amplifier and controlled at the booster amplifier. A
patch cable terminated in a standard pin plug is connected between
the Booster output jack on the amplifier and the input of the booster
amplifier.
Link switch
Provision is made to insert signal processing equipment into the
signal path, using the PREAMP OUT and POWER AMP IN.
Using signal processing equipments, LINK SWITCH must be turn-off.
Operation
When all connections are completed, turn power switch on.
Then the power indicator is illuminated when the amplifier is on.
Adjustment of volume
Adjust the individual input and the master volume control to obtain
appropriate output level.
Adjustment of tone quality
Each of the Bass and Treble control provides frequency-response
characteristics of flat in center, boost in clockwise and attenuation in
counterclockwise positions.

DC Power Operation

The unit will also operate from an external 24V battery or other direct
current source with negative (-) as ground. Power connections are
made at the DC terminal strip on the rear panel.
If AC power supply fails, transfer to DC power is instantaneous,
automatic and silent.
The battery power supply is not operated by the primary power
switch. If switching of battery power is desired, an external relay or
switch should be installed by the qualified service personal.
24V DC
24V DC
Terminal
24V DC
CAUTION
The unit should be used only with negative-grounded vehicle
or frame when DC operation is required.
Do not use the unit with positive-grounded equipment of DC
operation.
Connect the battery to DC terminal, after removing the screw
terminal cover.
Put the cover back on when finished the connection.
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Battery