Valcom V-9985-W, V-9983-W, V-9984-W Service Manual

V-9983 2 CHANNEL MODULAR PRE-AMP/MIXER

V-9984 REMOTE INPUT MODULE

V-9985 4 CHANNEL MODULAR PRE-AMP/MIXER

INTRODUCTION

These instructions contain the specifications and
guidelines necessary to install, operate, and
maintain the Modular Pre-Amp/Mixer. The unit
provides connections for up to 4 remote input
modules. The mixer consists of a V-9983 Main
Control Module and a V-9984 Remote Input
Module.

The Modular Pre-Amp Mixer is used with
Valcom distributed amplified one way paging
systems providing additional audio source
inputs.

The V-9985 provides active mixing for 1
balanced microphone and 2 auxiliary inputs.
Also supplied is an additional audio input
(building page) with an override feature. Up to 3
additional Remote Input Modules (V-9984) may
be connected to the Main Control Module. Each
Remote Input Module adds 1 Balanced
Microphone and 1 Auxiliary input.

Applications

• Valcom, Inc. Distributed Amplified One-Way

Paging Systems. Refer to Figure 1 for a
block diagram of a typical installation.

Features

Main Control Module V-9983

• High impedance auxiliary input

• Volume control for auxiliary input

• 2.5mm stereo mini jack for auxiliary input

• Master volume control

• Up to (4) four remote mixer modules may be

connected

• Separate outputs for Horns and Speakers

• Page port connection (Building Page) with

override option switch

• Remote Volume Control Connection

• LED Signal Meter

• Built–in Compressor, option dip switch

controlled

• Power "ON" indicator

• Mounts in 3 gang electrical box

MAIN CONTROL MODULE WITH
REMOTE INPUT MODULE

Remote Input Module V-9984

• Balanced microphone

• XLR Mic. Connection

• Phantom power for electret microphones

(Switch controlled)

• Phantom power “ON” indicator

• High impedance auxiliary input

• Volume control for auxiliary input

• 2.5mm stereo mini jack for auxiliary input

• Power "ON" indicator

• Mounts in single gang electrical box

• Connects to Main Control Module with 2 pair

24AWG station cable

• Screw terminals for distribution connections

Dimensions

Main Control Module

• 5"W x 4.25"H x 2”D
(12.7cm W x 10.8cm D x 5.08cm H)

• 4 lbs. (1.5Kg)

Remote Input Module

• 1.64W x 4.25"H x 2”D
(4.17cm W x 10.8cm D x 5.08cm H)

•

.25 lbs. (0.1Kg)

Issue 1

947285

1

Specifications

Outputs

Main Output: -10 dBm nominal, 100 ohms
Frequency Response: 20 Hz to 20 kHz ± 1dB
Horn Output: -10 dBm nominal, 100 ohms
Frequency Response 20 Hz to 20 kHz ± 1dB
(12 dB/Octave High pass at 300 Hz)

Tone Controls

Bass (50 Hz) boost or cut up to 12 dB
Treble (10 kHz) boost or cut up to 12 dB

Signal to Noise

-80 dB from maximum output

Auxiliary Input Sensitivity:

10 mV RMS for -10 dBm output
Input Impedance: >40 kΩ

Bldg Page Input Sensitivity:

30 mV RMS for -10 dBm output
Input Impedance: >4 kΩ (balanced input)

Signal Meter:

-10 dBm output lights first 5 LED's
3 dB per LED segment

Compression Ratio: 2.5 fixed
Attack: 1.5 Ms
Release: 0.3 seconds

Remote Volume Control

10 kΩ linear taper (gives audio taper)
One pair connection

Power Requirements

Voltage: 24VDC
Current: 50 mA

Remote Module

Connections: 1 pair audio, 1 pair 24 VDC
(From main control module)
Input Impedance: >4 kΩ (balanced)
Maximum Input: 1 V rms

Microphone Input

Input Sensitivity: 40 uV RMS (-10 dBm out)

Max Input: 30 mV RMS

Input Impedance: 3.5 kΩ Balanced

Signal to Noise:

-65 dB from max output

Phantom Power

24 Vdc with 2.2 kΩ

Auxiliary Input

Sensitivity:

10 mV RMS for -10 dBm output
Max Input: 1.4 V RMS
Input Impedance: > 40 kΩ

Environment

Temperature 0 to 50 Degrees C
Humidity 0 to 85% non-precipitating

INSTALLATION

Figure 1 shows volume control locations,
microphone and auxiliary input connections.
Figure 2 shows output terminal strips and
switches on the back of the mixer. Figure 3
shows a typical connecting arrangement. The V­9985 contains a Main Mixer Module and 1
Remote Module. Three additional remote
modules may be connected to the main mixer
module. Figure 4 shows other feature
connections. Figure 5 shows Remote Input
Module, Speaker and Power Connections.

All connections should be made to the mixer and
double-checked prior to connecting DC power.

Connect the microphone to balanced XLR cables
and the microphone XLR connector on the
Remote Input Module. If the microphone is a
condenser type it will require Phantom Power.
Turn “ON” the Phantom Power Switch located on
the Remote Module using a small scribe or paper
clip. The Phantom Power LED will illuminate.
The microphone volume control is located on the
remote module. Other sources such as CD and
MP3 players, tuners, and computer sound cards
may be connected to the auxiliary inputs located
on the remote and main modules. Volume
controls for the auxiliary inputs are located on the
remote input and main control module.

An additional audio input is available with a
volume control located on the PC board for
connection to a low level audio source such as a
telephone page port or Valcom One-Way Page
Control. An option dip switch located on the PC
board enables the input to override the
microphone and auxiliary inputs.

A compressor is available to even out a user’s
voice to compensate for poor microphone or
vocal technique and allow more microphone gain
before feedback. All auxiliary and microphone
inputs are routed through the compressor when
enabled. An option dip switch located on the PC
board enables the compressor.

947285

2

A connection is provided to add a remote volume
control. This is a 2 wire connection using a 10K
ohm linear potentiometer.

Speaker Connections

Connect Tip and Ring of Valcom Amplifed
Speakers to the output screw terminals located
on the Main Mixer Module. Connect Tip and Ring
of Valcom Amplified Paging Horns to horn audio
output screw terminals.

When setting the system up, it is recommended
that the master gain control be set 2/3 and aux
volume controls be set to 1/4.

OPERATION

The V-9985, Four Channel Pre-Amp/Mixer
actively mixes any signals present on the inputs.
Each input is equipped with its own volume
control to allow blending of the input sources.
The unit also has a master volume control to
allow a volume level adjustment of all mixed
signals. Bass and treble controls allow up to
12dB of boost or cut at 50 Hz and 10 kHz.

An audio input is available on the main control
module allowing connection of a low level signal
that will override all other inputs. An option dip
switch controls the override feature.

VALCOM LIMITED WARRANTY
Valcom, Inc. warrants its products to be free from defects in materials and workmanship under conditions of normal use and service for a period of one year from
the date of shipment. The obligation under this warranty shall be limited to the replacement, repair or refund of any such defective device within the warranty
period, provided that:

1. inspection by Valcom, Inc. indicates the validity of the claim;

2. the defect is not the result of damage, misuse or negligence after the original shipment;

3. the product has not been altered in any way or repaired by others and that factory sealed units are unopened (a service charge plus
parts and labor will be applied to units defaced or physically damaged);

4. freight charges for the return of products to Valcom are prepaid;

5. all units 'out of warranty' are subject to a service charge. The service charge will cover minor repairs (major repairs will be subject to
additional charges for parts and labor).

This warranty is in lieu of and excludes all other warranties, expressed or implied and in no event shall Valcom, Inc. be liable for any anticipated
profits, consequential damages, loss of time or other losses incurred by the buyer in connection with the purchase, operation or use of the product.

This warranty specifically excludes damage incurred in shipment. In the event a product is received in damaged condition, the carrier should be notified
immediately. Claims for such damage should be filed with the carrier involved in accordance with the F.O.B. point.

Headquarters:

Valcom, Inc.

5614 Hollins Road

Roanoke, VA 24019-5056

Phone: [phone]

FAX: [phone]

The integrated compressor feature is controlled
by an option dip switch. Microphone and
auxiliary inputs are routed through the
compressor when the compressor is active.

Two outputs are provided by the V-9985 modular
mixer.

• An output to drive full range speakers

• An output to drive limited range paging horns

TECHNICAL ASSISTANCE

When trouble is reported, verify there are no
broken connections. Assistance in
troubleshooting is available from the factory.
Call [phone] and press 1 for
Technical Support, or visit our website at
http://www.valcom.com.

Valcom equipment is not field repairable.
Valcom, Inc. maintains service facilities in
Roanoke, VA. Should repairs be necessary,
attach a tag to the unit clearly stating company
name, address, phone number, contact person
and nature of the problem. Send the unit to:

Valcom, Inc.

Repair & Return Dept.

5614 Hollins Road

Roanoke, VA 24019-5056

947285

3

947285

4

947285

5

947285

6