DETAILS OF CALL-POINT CONNECTIONS : SINGLE CALL-POINT
CAUTION
: THE MIXER CONTROLS ARE FACTORY SET : DO
NOT
ADJUST THESE
WITHOUT REFERENCE TO THE INSTRUCTIONS BELOW
The microphone gain (and therefore the output level) of the intercom unit is set to suit the
ADPRO transceiver’s input sensitivity. This is nominally 1 Volt peak-to-peak. Adjustment
of this control is performed at the factory and should not be adjusted in the field unless an
oscilloscope is available to measure the input level to the transceiver.
Mis-adjustment of this control may cause the audio signal to be too low, inaudible or
distorted at the receiver.
The output level control may be adjusted on-site to give the required audio level from the
call-point’s loudspeaker. The message control will normally be set to minimum, as the
message playback level is set on the message card PCB (where fitted).
U4
MIC
GAIN
MESSAGE
GAIN
OUTPUT
LEVEL
NOTE : These controls are shown
set to their factory positions and
should not require adjustment
800
mA
F
U
S
E
PB
PB
OC+
OC-
LSP+
LSP-
MIC+
MIC-
LSP+
LSP-
MIC+
MIC-
SPARE
VIDEO
GROUND
+12V
VIDEO GROUND-LOOP
ISOLATION TRANSFORMER
C14
C11
Solder
Dot
U1
R7 R13 R19
U2
U3
IC1
9 15
1
8
GR
OU
N
D
CA
LL IN
P
U
T (
+
)
CA
LL IN
P
U
T (
-)
AUD
IO
O
U
T
(-
)
AUD
IO
O
U
T
(+
)
A
U
D
IO
IN
(
-)
A
U
D
IO
IN
(
+
)
} CALL
O
U
T
TO VST10 I/O EXPANSION
POW
E
R
CO
N
N
E
C
T
MODEL AVPSU4
Advanced Visual Solutions
CA
L
L
O
U
T
+V
O
U
T
PAIR A
PAIR B
ORANGE/WHITE
WHITE/ORANGE
BLUE/WHITE
WHITE/BLUE
PAIR C
WHITE/GREEN
GREEN/WHITE
VIDEO OUTPUT
TO ADPRO
TRANSCEIVER
ALARM INPUT
CHANNEL (n)
2 CORE DC POWER CABLE : >= 1.0mm
2
F
A
CT
OR
Y
W
IRE
D
F
A
CTO
R
Y
W
IR
E
D
F
A
CTO
R
Y
W
IRE
D
THIS UNIT (AVPSU4) IN EQUIPMENT ROOM
WITH ADPRO TRANSCEIVER
THIS UNIT (CALL-POINT) AT REQUIRED LOCATION
(WITHIN 250m OF AVPSU4)
FA
C
T
O
RY
WI
R
E
D
15 WAY RIBBON CABLE
TO ADPRO TRANSCEIVER
LABELLED
“Auxiliary I/O”
or “Switcher”
(15 Pin “D” type connector)
DOCUMENT NUMBER AV102SS/OEM/01 REVISION 6.1 1st August 2006 Page
5
of 22
