14
15. BLOCK DIAGRAM
+
+
+
8765432
1
MOH OUT
0 dB/600
Ω
EMERGENCY
0 dB/10 k
Ω
TEL PAGING
–
20 dB/10 k
Ω
MIC 1
–
60 dB/600
Ω
MIC 2
–
60 dB/600
Ω
MIC 3
–
60 dB/600
Ω
AUX 1 (MOH IN)
–
20 dB/10 k
Ω
AUX 2
–
20 dB/10 k
Ω
AUX 3
–
20 dB/10 k
Ω
MIC 1
SELECTOR
REMOTE OUT
CONTROL
+
+
+
–
–
H
C
H
C
G
H
Optional
C
G
(70 V)
240 V
230 V
(50 V)
PA
Relay
2
Relay
1
Mute control
Chime
Emergency
mode ON/OFF
ON
POWER
switch
P
o
w
er f
or
control section
Mute
Mute
P
o
w
er f
or
audio section
P
o
w
er f
or
chime circuit
ZONE 2
ZONE 1
ZONE 1 (100 V)
ZONE 2 (100 V)
Zone 2
Zone 1
POWER
TEL
EMERGENCY
220
–
230
V A
C
or 240
V A
C
,
50/60 Hz
PT
Fuse
Fuse
Output
le
v
el meter
JP
OT
DIRECT (100 V)
4
–
16
Ω
+
24 V
INPUT
C
C
REC OUT
0 dB/600
Ω
LINE OUT
0 dB/600
Ω
0 dB
1
2
ON
OFF
ON
OFF
–
20 dB
–
20 dB
–
20 dB
–
20 dB
0 dB
0 dB
0 dB
BASS/TREBLE
MASTER
volume
Interlocked with
Relay 1 (ZONE 1)
(Relay 1)
(Relay 2)
Interlocked with
Relay 2 (ZONE 2)
Phantom po
w
er ON/OFF
Phantom
po
w
e
r
Function s
w
itch (DIP s
w
ich)
Fuse
EB
EB
EB
EB
Mute control
(MIC 1)
Mute control
(TEL, EMER)
MIC 1 voice-activated mute ON/OFF
Chime tone selection
TEL voice-activated mute ON/OFF
–
TEL
EMERGENCY
A-1812 only
