Audio Amplifier and Power Supply
USA MAV500/MKVI Service Manual
15.3 Audio SPL Requirement of EGM
The audio SPL requirement of the EGM is for a sound pressure level of 105dB at
0.5m from the front of the EGM measured from the top of the monitor. The
frequency response is from 50 Hz to 10kHz
±
6dB.
15.4 Amplifier Power Required
There are two high frequency speakers and one low frequency speaker.
Requirement is to achieve 105dB at a distance of 0.5m from the front of the
machine. The high frequency speaker has a sensitivity of 82dB/W at 1m. In other
words, with 1 watt at 1 metre the SPL is 82dB. At a distance of 0.5m the output is
85db. With two speakers, an additional 3dB is obtained, achieving 88 dB. A power
increase from one watt to 50 watts achieves the additional 17 dB required.
15.5 Interface Requirements
15.5.1 Power Interface
This is the power input, nominally 24V DC
±
10%. All the pins are used as there
is a high current through the pins.
Table 15-1 Pin Connections for Power Connector
Pin Number
Signal Name
Signal Description
1 24V
Power
in
2 24V
Power
in
3 0V Ground
4 0V Ground
Table 15-2 Power Requirements
Signal Name
Description
Voltage
24V ± 10%
Current
< 1A cont. 8.0 A peak
Power Consumption
< 200 W
15-4
28-00486-00
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© Copyright (ATI) Aristocrat Technologies, Inc. 2002
