NCI Technologies NCI 20 User manual

FEATURES
TEL /MIC
VOL BASS TREBLE
PRE-
TONE
VOL
VOL BASS TREBLE
MUSIC NITE
BELL
VOL
User Manual
for
Telecom Paging Amplifiers
Models NCI 20, NCI 50 & NCI 100
NCI Technologies
• Telephone system interface for paging.
• Full range volume and tone controls.
• Output fully short circuit protected.
• Separate bass & treble controls for paging and music.
• Adjustable background music.
• Adjustable paging pretone.
• Dry contact or VOX music mute (for telephone system applications)
• Integrated connector for optional system expansion modules.
• Wall mounting.
• NRTL/C certified (Complies with both UL & CSA standards)

CONTROL PANEL LAYOUT
6"
• Power output: NCI 20 20 watts rms
NCI 50 50 watts rms
NCI 100 100 watts rms
• Distortion: Less than 1% at
1,000Hz rated output
• Frequency response: ±3 dB, 100 ≈20,000Hz
• Inputs: Tel/Mic 600Ωbalanced
Music 10kΩunbalanced
• Sensitivity Tel 150mV
Mic 1mV
Music 100mV
• External Controls Pretone Volume
Music Volume
Bass ±10 dB @ 100 Hz
Treble ±10 dB @ 20 kHz
SPECIFICATIONS
• External Controls Tel/Mic Volume
Bass ±10 dB @ 100 Hz
Treble ±10 dB @ 20 kHz
Nite Bell Volume
• Internal Control VOX
• Output: 70.7 Volts rms
• Power source: 120V AC, 60Hz
• Power Consumption: NCI 20 48 watts
NCI 50 80 watts
NCI 100 176 watts
• Dimensions: W 123/4", H 71/2", D 3"
(W 323, H 190, D 76 mm)
• Weight: NCI 20 6.0 lb (2.73 kg)
NCI 50 7.6 lb (3.44 kg)
NCI 100 10.7 lb (4.86 kg)
1) Mount the amplifier on a wall, or base plate,
capable of supporting its weight securely. Use
appropriate screws or dowel/screw combination
for dry walls.
Be sure no radiators or other heat producing
elements are nearby. Also be sure that the
area behind the amplifier allows a clear path
of air to flow behind the amplifier and that the
air slots at top and bottom are not obstructed.
INSTALLATION
IMPORTANT NOTICE
Should you require technical assistance during installation, please call our toll-free
Technical Support Line
1-888-633-2666
IMPORTANT: To comply with NRTL/C safety regulations,
a minimum clearance of 6 inches must be maintained
above the unit (see diagram).
2) Loosen (do not remove completely) the screw at the
bottom of the door to gain access to the terminals of the
amplifier.
3) Lift the door all the way up. In the fully open position you
can conveniently use the screening as a guide to the
terminal connections.
FUSE Power ON
Indicator
GND Output
Terminal
Main Controls DIP Switches VOX Control
Input Terminals
External Module
Ribbon Connector
2

In accordance with your particular system installation
and requirements, make the following connections at
the terminal block at the right.
A) Pins 1&2 – TEL/MIC (Balanced Input)
Connect to either the telephone system page port,
C.O. port, a telephone set or an external microphone
(600Ωbalanced - shield to pin 3) to these terminals.
Depending on which source is used, DIP switches
1&2 need to be set accordingly.
This voice input can only be activated by the page
port dry contacts, the VOX circuit, the C.O. port talk
battery circuit or a strap across pins 5 & 6
See installation examples on pages 6.
CAUTION:This input must NOT be connected directly to
the telephone network.
B) Pins 3&4 – MUSIC (Unbalanced Input)
Connect a music source to these terminals noting
that pin 3 is a signal ground pin. Reversed
connection can cause oscillations. It is important that
shielded cable be used to avoid any induced hum.
See installation example F on page 6.
C) Pins 5&6 – MUSIC MUTE
Connect the telephone system page port dry relay
contacts to these pins. This will activate the voice
input of the amplifier and deactivate the music input
(Music mute) thus cutting off the background music.
These pins must be strapped if voice input on pins
1 & 2 is to be permanent.
D) Pins 6&7 - NITE RINGER Activation
Connect N.O. (normally open) dry relay contact
from KSU or PBX to these pins.
E) Pins 8&9 - NITE RINGER Activation
Connect Tip & Ring from Bell C.O. line or phone
system single line port.
123456789
OUTPUT
OUTPUT CONNECTIONS
Connect the speaker wiring to the terminal block at the left
marked OUTPUT. Follow the guidelines for Class 2 Wiring
making sure that the total load does not exceed the rated
maximum load as marked on the door of your particular
model amplifier.
NOTE:To prevent any possible oscillations, ensure that
the speaker wires connected to the output
connector are kept away from any input wiring
connected to the terminal strip described below.
INPUT CONNECTIONS
Input
Connections
3
123
From
telephone
system
page port
or C.O. port
1234
123456
Aux
Tuner or Casette
Output
78
Signal Input
Signal Ground
9
123456
Page Control
contacts
7
123456
Dry Contact
789
Activation from
KSU or PBX
123456
Tip
789
Activation from
Bell C.O. Line
or Single Line Port Ring
123456789
Balanced
Microphon
e
A
B
D
C
E
123456789
Strap for permanent Voice Input

VOX CONTROL SETTING
DIP SWITCH SETTINGS
DIP SWITCHES (1-7)
Set the DIP switches according to your particular system
installation and requirements as follows.
Note: Switch 8 is not used.
A) DIP Switches 1&2 – TEL/MIC
If connected to a phone system page port set both
switches to the ON position.
If an external mic is connected, set both switches to the
OFF position.
B) DIP Switch 3 – VOX (Voice activated switch)
Set the switch to the ON position if the VOX option for
music mute is to be enabled.
C) DIP Switches 4 & 5 – TALK-BATT. (Talk Battery)
Set both switches to the ON position to enable this
function. This option provides talk battery to the
telephone set or telephone system C.O. trunk port.
D) DIP Switch 6 – PRE-TONE
Set this switch to the ON position to enable the
Pre-tone function.
E) DIP Switch 7 – NITE RINGER-TONE
Set this switch to the ON position to provide a normal
chime tone.
Set this switch to the OFF position to provide a high
frequency chime for noisy environments.
DIP Switches
VOX Control Setting
Control setting for VOX (Voice activated switch)
This trimpot adjusts the sensitivity of the VOX threshold
of the voice (Tel/Mic) input. To adjust the VOX
threshold, the following procedure should be followed:
1) Set the VOX control fully CCW (background music
should be on).
2) Have someone, such as the receptionist, make a
page call. During the page call slowly turn the VOX
control CW until the VOX circuitry triggers, the
background music cuts off and the page is heard
over the speaker(s).
3) Turn the control an additional 1/8 turn CW and leave
at this setting.
If the VOX function has a tendency to drop out,
slightly increase (CW) the control setting.
Notes:
1) The absence of speech for more than 4 seconds
releases the VOX and the background music comes
back on.
2) This adjustment is critical and may require some
experimentation.
VOX
VOX
Control
4
123456
ON 7TEL
MIC
123456
ON 7VOX enabled
VOX disabled
123456
ON 7TALK-BATT enabled
TALK-BATT disabled
123456
ON 7PRETONE enabled
PRETONE disabled
123456
ON 7Normal Chime
High Frequency Chime
A
B
C
D
E
1/8
Turn
Testing
Hello
Testing

MAIN CONTROLS
A) FUSE
Warning Replace only with same type fuse (3AG
SloBlo) with rating depending on which model of
amplifier you have.
Model NCI 20 3/4Amp
NCI 50 11/4Amp
NCI 100 2 Amp
B) POWER ON Indicator
Provides indication that the amplifier is powered.
C) GND
A chassis ground post has been provided to allow
separate electrical grounding of the unit, if required.
IMPORTANT
Do NOT connect signal ground leads to this post.
5
FUSE Power
ON
GND
POWER CONTROL
MAIN CONTROLS
All user controls are accessible through the front door.
Since these controls are normally set at installation, they
purposely protude only slightly from the cover so that they
are not accidentally changed from their settings.
A) PRE–TONE Vol
Adjust the level of the pre-tone signal over the speakers.
B) MUSIC Vol-Bass-Treble
Adjust the level and tone of the background music.
C) TEL/MIC Vol-Bass-Treble
Adjust the level and tone of the tel/mic input separate
from the music.
D) NITE RINGER Vol
Adjust the level of the nite ringer signal over the
speakers.
PRE
TONE
VOL VOL BASS TREBLE VOL VOL
NITE
BELL
BASS TREBLE
MUSIC TEL/MIC
AB CD
This equipment has been tested and found to comply with the limits for Class B Digital Device, pursuant to Part 15 of the
FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential in-
stallation. This equipment generates and can radiate radio frequency energy and, if not installed and used in accordance
with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that in-
terference will not occur in a particular installation. If this equipment does cause harmful interference to radio or televi-
sion reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
• Reorient or relocate the receiving antenna;
• Increase the separation between the equipment and receiver;
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected;
• Consult the dealer or an experienced radio/TV technician for help.
Any changes or modifications not expressly approved by NCI Technologies could void the user’s authority to operate the
equipment.
CLASS B DIGITAL DEVICE WARNINGS
INFORMATION TO USER

A- Typical Paging from a Telephone System Page Port with
Control Contacts
1 - Connect voice source to
pins 1 & 2
2 -Connect page control to
pins 5 & 6
3 -Set DIP switches as shown
Setting of DIP switch 6
(Pre-tone enable) to the ON
position is optional.
Note: The input impedance of
pins 1 & 2 is 600Ω
balanced.
B- Typical Paging from a Telephone System Page Port without
Control Contacts 1 - Connect voice source to
pins 1 & 2
2 - Set DIP switches as shown
Setting of DIP switch 6
(Pre-tone enable) to the ON
position is optional.
3 - Adjust VOX control
accordingly.
(See page 4)
Note: The input impedance of
pins 1 & 2 is 600Ωbalanced.
C- Typical Paging from a Telephone System C.O. Port or a
Telephone Set
This configuration is normally
used in applications where a
telephone system is not
equipped with a page port.
1 - Connect Tip and Ring wires
to pins 1 & 2 respectively
2 - Set DIP switches as shown
Setting of DIP switch 6
(Pre-tone enable) to the ON
position is optional.
123456
TR
From
telephone
system
C.O. port
123456
ON 7
789
123456 VOX
From
telephone
system
page port
123456
ON 7
789
D- Typical Paging / Public Address using a Microphone and
VOX Control for Music Mute
1 - Connect mic to pins 1 & 2
2 - Connect Mic shield to pin 3
3 - Set DIP switches as shown
Setting of DIP switch 6 (Pre-tone
enable) to the ON position is
optional.
4 - Set VOX control
accordingly.
(See page 4)
Note: Microphone used must be
a 600Ωbalanced type.
E- Typical Paging / Public Address using a Microphone without
Background Music.
1 - Connect mic to pins 1 & 2
2 - Connect Mic shield to pin 3
3 - Strap pins 5 & 6
4 - Set DIP switches as shown
Setting of DIP switch 6
(Pre-tone enable) to the ON
position is optional.
Note:Microphone used must be
a 600Ωbalanced type.
F- Typical Background Music 1 - Connect music source to
pins 3 & 4
Note:The input impedance of
pins 3 & 4 is 10kΩ
unbalanced.
Important:
A shielded audio cable must
be used to avoid any
induced hum or oscillations.
Be sure the shield is
connected to pin 3 while the
center signal conductor is
connected to pin 4.
123456
Aux
Tuner or Casette
Output
78
Signal Ground
9
123456
123456
ON
Balanced
Microphone
7
789
123456
123456
ON
Balanced
Microphone
7
789
6
123456
Page Control
contacts
From
telephone
system
page port
123456
ON
78
7
9
THREE (3) YEAR LIMITED WARRANTY
NCI warrants its products to be free from defects in material and workmanship under normal use and service for a period of three (3) years after delivery to the ultimate
user. At our discretion, NCI will repair-free-of charge or replace at no charge a product should it, upon examination, be proven defective and under warranty. NCI
reserves unto itself the sole right to make the final decision whether there is a defect in materials and/or workmanship, and whether or not the product is within the
warranty.
This warranty shall not apply to any NCI product which has been subject to misuse, neglect, accident, or used in violation of instructions furnished, nor extended to units
which have been repaired or altered outside of the factory.
This warranty covers bench repairs only. Any repairs must be made at the shop or place designated in writing by NCI. NCI will not be responsible for any costs
incurred involving on-site calls.
All implied warranties, including any implied warranty of merchantability or fitness for any particular purpose, are limited in duration to three years from date of original
purchase. In no event will NCI be responsible for consequential damages resulting from the use of this product.
© NCI 0003 V1.1 - All rights reserved.
Installation Examples