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8.5.3 Standby Tone Generator
This board is the STANDBY to the main tone generator board. Should the main board fail, the STANDBY
board is automatically switched into circuit and the TONE fault indicator on the front panel is
illuminated.
8.5.4 Microphone / BGM Mixer Board
The microphone preamplifier board accepts inputs from the Panel MIC via a microphone preamp (302-
475), Remote Paging Console and two BGM Inputs. The microphone inputs operate with a
compression circuit to compensate for varying input levels. Level adjustments for both the main and
remote microphones are provided to allow the user to set the system up for the specific requirements
of the installation. The BGM inputs are provided with level controls and will be muted to all zones
when:
➢ EWS is operating from batteries
➢ Alarm signal is received in automatic or manual mode
➢ In manual mode and the zone control switches on the ECP are selected
Note: The background music is restored ONLY following a MASTER RESET operation.
POWER
LED2
OWS PA MIC
RV4
RV5
PAGING MIC
TX8
C23
LED1
BGM 1
RV2
BGM 2
RV3
8.5.5 Standby Microphone / BGM Mixer Board
This board provides a complete duplicate of the main Microphone/BGM board and is automatically
switched in when the system detects a failure in the main board. The Microphone fault indicator is
also illuminated.
If level adjustments are required first remove the main Microphone/BGM Mixer.
8.5.6 FACP Input CPU Board
This board interfaces all the hard wired FACP inputs into the EV3000 Main CPU. When the EV3000 is
installed with an AB3000 this board is not installed. The secondary CPU has an address setting which
is factory set and should not be field adjusted.
LK1
+
IC8
+
+
MICROPHONE MIXER
Figure 9: 302-4840 Microphone / BGM Mixer
IC3
IC2
+
TX4
TX2
TX7
TX6
MAN1813-9
c
a
2
4
6
8
10
12
TX5
14
RFC2
16
+
18
20
22
IC7
24
26
28
30
32
302-484C
19
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