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

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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.

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