Functional Description; Block Diagram Of Amplifier Module - Aristocrat USA MAV500/MKVI Service Manual

USA MAV500/MKVI Service Manual

15.1 Functional Description

The Audio Amplifier Module 410539 amplifies the signal from the speaker output
of the main board. The amplifier module has two channels to allow for stereo
sound.
An active crossover splits each audio signal into a high frequency and a low
frequency and the signal is then fed to the power amplifiers. The active crossover
allows easy balance of the acoustic output of the speakers as they have different
sensitivity.
A signal detector circuit mutes the amplifier when not in use to minimize the
power consumption.
A digital potentiometer controls the volume. This can be controlled by a panel-
mounted toggle switch.
The audio amplifier is powered from the 24V rail of the EGM.
A power supply generates the correct voltage required for the amplifier.
15.2

Block Diagram of Amplifier Module

Audio Inputs
High Level Right
INPUT
High Level Left
BUFFER
Low Level Right
Low Level Left
USB USB DAC
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DIGITAL
MIXER
POT
INPUT SIGNAL
DETECTOR
Figure 15-1 Block Diagram of Amplifier Module
Audio Amplifier and Power Supply
50 W AMP
HIGH
PASS
50 W AMP
50 W AMP
Mon Summing
LOW
Bridging and
PASS
Level Adjust
50 W AMP
POWER SUPPLY
Audio Outputs
High Frequ Right
High Frequ Left
Audio Outputs
Low Frequ Right
Low Frequ Left
15-3