Toa A-503A - Rear Panel Controls and Features

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21
Name
AC power supply cord
AC outlet (unswitched)
AC fuse
24V DC terminals
Output terminals
Input 1 (Mic 1),
Input 2 (Mic 2) inputs
Pahntom power ON/OFF switch
(Mic 1, Mic 2)
Input 3 (Mic 3), Input 4 (Mic 4) inputs
Input 3 (Mic 3/Mag. phono) select switch
Input 4 (Mic 4/Aux 1) select switch
Mag. phono input
Aux 1 - 3 inputs
Aux 3 volume control
Tape output
Booster output
Preamp output
Power amp input
Link switch
Remote volume control terminals
Mute terminals
(adjustable muted level: 0 - 30dB)
Earth terminal
Function/Description
Connects to AC power supply.
Provides AC power for auxiliary equipment with power consumption
of up to 500W.
Prevents excessive current flow.
Connect to DC power supply (24V).
Connect to speakers.
Connect to microphones of balanced 200 ohms with XLR
connectors.
This switch is to be turned on when using the condenser
microphone.
These screw terminal inputs connect to unbalanced 50k ohms
microphone.
Selects Mic 3 or Mag. phono input.
Selects Mic 4 or Aux 1 input.
Connects to the record player with MM type cartridge.
Connect aux inputs.
Adjusts gain of Aux 3.
Provides connections for a tape recorder. The input impedance of
the equipment should be more than 4.7k ohms.
Provides connections for a booster amplifier. The input impedance
of the equipment should be more than 600 ohms.
Connects to a signal processing equipment such as a limiter,
equalizer etc. The input impedance of the equipment should be
more than 600 ohms.
In this case, Link switch should be set the "OUT" position.
When using this terminal, set Link switch to "OUT".
Disconnects between preamplifier and power amplifier when this
switch is set to "OUT", allowing the connection of other equipment.
Mic 2 volume can be adjusted by means of a 10k-ohms
potentiometer connected to these terminals.
Short-circuiting these terminals mutes input signals (inputs 3-5).
Normally connects to record player's ground.
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