PROFESSIONAL AUDIO & SOUND
®
TM
DIGITAL MUSIC SERIES
DIGITAL MUSIC AMPLIFIERS
INSTALLATION AND WIRING
PAGE 10
SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE
T3015/3030DMA
MUTING FUNCTIONS
VOX - VOICE ACTIVATED MUTING - The Amplifier is equipped
with a DUAL noiseless, fast acting Logic Muting Function. When a
signal is present at the INPUT 1 or INPUT 2 Input, either from a
Microphone or a Telephone Paging source, the Muting Function is
activated muting the source present at the INPUT 3 and as well as
the source present at the PROGRAM input(INPUT 2) if selectively
activated. Once the Signal (paging) is terminated the program is
automatically restored on all muted inputs.
FOR THE VOX ATTACK AND DECAY TIMING REFER TO THE
FIG. 11B DIAGRAM.
ACCESS TO MUTING SELECTORS
ON REAR PANEL THROUGH SELECTOR SWITCHES
VOX CONTROL
INPUT 1 VOX ON = INPUT 1 MUTES INPUT 3
INPUT 2 VOX ON = INPUT 2 MUTES INPUT 3
INPUT 1 VOX & INPUT 2 MUTE ON = INPUT 1 MUTES INPUT
2 and 3
Fig. 10 - Main Amplifier PCB - VOX - MUTING Section - Top View
VOX - VOICE ACTIVATED MUTING
VOX SENSITIVITY CONTROL
VOX 2
VR7
VOX 1
VR6
VR1
VR2
INPUT 1
CONTROL
CHIME PCB
VR8
CURRENT
CN17
INPUT 2
CONTROL
VR3
INPUT 3
CONTROL
DMS-1
3015B Vovpcb
VOX 1 SENSITIVITY
TRIMMER
VOX 2 SENSITIVITY
TRIMMER
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 Trimmers pre-setting require adjustment follow the instructions listed below.
The Amplifier provides several levels of Muting functions:
INPUT 1 (MIC/TEL)
This input is never Muted
INPUT 2
Can be selectively Muted by selector Switch
INPUT 3
Can be selectively Muted by selector Switch
MUTING FUNCTIONS
CAUTION: PRIOR TO PERFORMING THIS
OPERATION BE SURE TO FOLLOW THE
SAFETY NOTES REFERRING TO THE
REMOVAL OF THE AMPLIFIER COVER.
AUTOMATIC PRECEDENCE THRESHOLD
The VOX Trimmers VR 6 & 7 set the sensitivity level at
which point the VOX 1 and VOX 2 respectively are
engaged during paging. The VOX Trimmers are located
on the Main Printed Circuit Board (see Fig. 10).
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 INPUT 1 (Front Panel) Volume
Control until the desired output level is achieved.
5) Connect a Music Source to INPUT 3 Input and rotate
the INPUT 3 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 VR 6 (VOX 1) slowly clock-
wise until the Program (music) is cut-off (Muting activat-
ed).
VOX 2 ADJUSTMENT
Connect a Microphone or Program to INPUT 2 and
adjust Trimmer VR 7 (VOX 2) as per above
VOX SENSITIVITY ADJUSTMENT
MUTING SWITCHES ADDRESS
Switch Settings
I
N
P
U
T
1
TEL
Prog
CD
Off
Off
Off
MIC
MIC
I
N
P
U
T
2
I
N
P
U
T
3
I
N
P
U
T
1
I
N
P
U
T
2
I
N
P
U
T
2
Z
O
N
E
1
Z
O
N
E
2
E
Q
L
I
N
K
Off
Vox
On
Mute
On
Vox
On
Aux
INPUT
3
INPUT
2
On
Switchset06
Fig. 10A - Muting/Vox Control Switches - Rear Panel