Aiphone T3130BGM Operating Instructions Manual page 8

®
PROFESSIONAL AUDIO & SOUND
MUTING FUNCTIONS
VOX - VOICE ACTIVATED MUTING
VOX - VOICE ACTIVATED MUTING - The Amplifier is equipped
with a noiseless, fast acting Logic Muting Function. When a signal
is present at the MICROPHONE or TELEPHONE Input, either
from a Microphone or a Telephone Paging source, the Muting
Function is activated muting the source present at the AUX Input
and as well as the source present at the PROGRAM input if selec-
tively activated. Once the Signal (paging) is terminated the pro-
gram is automatically restored on all muted inputs.
FOR THE VOX ATTACK AND DECAY TIMING REFER TO THE
FIG. 9B DIAGRAM.
ACCESS TO MUTING SELECTORS
FOLLOW DIRECTIONS AS PER DIRECT MUTING FUNCTION.
VOX SENSITIVITY CONTROL
The VOX Sensitivity Intervention threshold is adjusted at the factory for best performance and does not require re-touch-
ing under normal circumstances. Should the Trimmer pre-setting require adjustment follow the instructions listed below.
VOX SENSITIVITY TRIMMER
VOX
VR9
VOX
SELECTOR JUMPERS
MIC
VOLUME
Fig.8 - Main Amplifier PCB - VOX - MUTING Section - Top View
PAGE 8
INTEGRATED AMPLIFIERS
INSTALLATION AND WIRING
JP3
JP2
ON OFF
ON
OFF
AUX
VOLUME
Specifications are subject to change without notice
The Amplifier provides several levels of Muting functions:
MICROPHONE Can be selectively Muted by internal selector
TELEPHONE This input is never Muted
AUXILIARY Can be selectively Muted by internal selector
PROGRAM Can be selectively Muted by internal selector
Several Jumpers are provided to set the Muting functions:
JUMPER NO.
JP 1 MICROPHONE Mute ON - OFF
JP 2 AUXILIARY Mute ON - OFF
JP 3 PROGRAM Mute ON - OFF
NOTE: The Microphone Input is provided with a unique MUTE
and UNMUTE function. See the Mute/Unmute operation instruc-
tions in the appropriate section in this Manual.
3130 - 1
PROGRAM
VOLUME
MUTING FUNCTIONS
MUTING JUMPERS ADDRESS
FUNCTION
VOX SENSITIVITY ADJUSTMENT
CAUTION: PRIOR TO PERFORMING THIS
OPERATION BE SURE TO FOLLOW THE
SAFETY NOTES REFERRING
REMOVAL OF THE AMPLIFIER COVER.
AUTOMATIC PRECEDENCE THRESHOLD
The VOX Trimmer VR 9 sets the sensitivity level at which
point the VOX is engaged during paging. The VOX
Trimmer VR9 is located on the Main Printed Circuit
Board (see Fig.89).
CAUTION: Procure a miniature screwdriver having a tip
NO WIDER than 3/16" (3 mm). A larger tip screwdriver
can damage the trimmer.
1) Turn all Input Controls to 0.
2) Turn Trimmer counterclockwise until it stops.
3) Connect a Paging Source (Microphone or Telephone)
to the respective Input Terminals (For connection details
refer to the appropriate section in this Manual).
4) While talking from the Paging Source (Microphone or
Telephone) rotate the MIC (Front Panel) or TEL (Rear
panel) Volume Control until the desired output level is
achieved.
5) Connect a Music Source to the AUX 1 Input and
rotate the AUX 1/CD Volume Control on the front panel
until the desired output level is achieved.
6) While talking from the Paging Source (Microphone or
Telephone) turn the Trimmer slowly clockwise until the
Program (music) is cut-off (Muting activated).
VOX DEFEAT INSTRUCTIONS
In applications requiring the VOX to be
inoperative rotate the VOX TRIMMER VR 9
fully counterclockwise. In this position the
VOX is inoperative.
T3115/3130/3160BGM
TO THE