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Operating instructions

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Doc.No.: 96106-001-DE
Page 3 of 8
V:\prosjekt\96106 SPA-1500\1500\DESC\96106-001-DE.doc
1.0. INTRODUCTION.
A pa and entertainment system consists of PA control units, operation unit, and the
amplifiers.
The operation unit SPA 1500 is the central unit in a SPA system.
The compact design makes it easy to install. The mounting is in standard 19" rack or
console.
All the electronics and logic required is located in the SPA 1500.
The amplifiers may be placed away from the SPA 1500, but this requires more cabling.
2.0. GENERAL DESCRIPTION.
The SPA 1500 is in max version is comprising the following parts:
- System board for SPA 1500.
- Car cassette radio/ CD player. (Option)
- Power supply for 110 > 230 VAC (Option)
- DC converter for the car radio. (Option)
- Entertainment control panel.
- Status panel leds.
- Screw terminals for power and signal cables.
3.0. SYSTEM BOARD FOR SPA 1500.
This PCB contains all the electronic parts required in an operation unit.
The below description refers to drawing 96106-006-CD.
3.1. AUDIO ROUTING.
The 3 microphone line inputs are routed through the user audio switching relays RE1-RE3 to
the preamplifier (M19, M20) with automatic gain control. The preamp. raises the audio
from microphone level to approximately 0 dBm. (775 mV)
0 dBm is the appropriate level to the power amplifier inputs.
The external pa audio interface is on 0dBm level, and goes through RE4 directly to the audio
buffer.
Attention tone ding-dong board. (Option).
This circuit board generates a ding-dong sound in the loudspeakers prior to a PA message.
An active TALK/KEY signal from the three users or the external pa source starts the
ding-dong generator.
Note that the ding-dong only work in PA mode, entertainment does not start the ding-dong.
Alarm tone generator board (Option).
The alarm is an optional facility. There are three different alarm sounds available in the
system.
The alarms are started and stopped from an external control panel or from automatic alarm
panels like a fire detector panel.
Handbook page
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