Protech Audio 882 - Manual (Page 2)

INSTALLATION
The 882 Line Amplifier/Tone Control Card is designed to
be mounted in the Model 857B Card Frame Package, or
the Model 858B Card Frame Package. The Model 857B Card
Frame Package will accomodate up to 10 audio cards, and
requires an external power supply. The Model 858B Card Frame
Package will accomodate up to 9 audio cards, and has a built-in,
unpluggable power supply card.
Both card frame assemblies bus the DC power to the individual
card slots, and provide screw-type barrier termination points for
audio and DC connections.
The determination as to which card frame assembly to use
in your project, was made prior to our factory receiving the order.
The card frame assembly you have received will
accommodate the group of cards you or your designer have
specified.
4- Unpack each individual card, inspect for shipping
damage, and assuming none is found, slide the card
half-way into the appropriate slot. After all cards have been
installed half-way into the card frame, plug in one card at a time
and turn on the power supply. Make sure no unusual loading is
noticed at the power supply. If loading is noticed, turn off the
power supply, unplug the card and recheck terminations. If no
loading is noticed, continue inserting each card in the card frame,
checking power supply loading as each card is plugged in. When
all the cards have been plugged in, the installation is complete,
and all that remains is the alignment.
Each INTEGRA III SYSTEM card with line level inputs has been
shipped from the factory aligned for unity gain. This alignment
optimizes headroom. Ifadditional gain is required, the following
alignment procedure is recommended;
1 - Apply a signal representative of the actual signal level to
be used, to the input.
2 - While monitoring the #1 output channel, turn the output
gain trimpot clockwise until the output signal reaches
the desired level.
3 - Using whatever measuring system is appropriate for the
particular installation, adjust the low frequency trimpot
until the desired low frequency response is achieved.
4 - Repeat step 3, now adjusting the high frequency trimpot.
This completes the installation and alignment of your Line
Amplifier/Tone Control cards. The cards may be expected to
deliver years of uninterrupted service.
Page 2
ALIGNMENT
Note 1 -
The alignment procedures for INTEGRA III SYSTEM cards,
differ from card type to card type. Therefore it is necessary to
consult the alignment procedure for each type of card being
installed, to properly align a card frame using different card
types.
INTEGRA III SYSTEM
CONNECTOR & TRIMPOT DRAWING
MODEL 882
857B & 858B BACKPLANE CONNECTIONS
PROTECH AUDIO ®
HI FREQUENCY
LOW FREQUENCY
CW = BOOST,
HORIZONTAL = FLAT
CCW = CUT
The actual steps necessary for installation of the Model 882
Line Amplifier/Tone Control cards, are comparable to those
necessary for any of the INTEGRA III SYSTEM cards. They are
as follows:
1- Mount the card frame in an appropriate EIA 19" width rack,
using 4 screws of sufficient tensile strength to provide secure
mounting.
2- A determination has been made as to which type of power
supply will be used on your system. Follow the instructions for
the type of power supply you will be installing.
EXTERNAL POWER SUPPLY.
If an external power supply is to be used, terminate the proper
supply connections to pins 1, 2, & 3 of the DC barrier connector
, as shown in the card frame layout drawing. Turn on the
power supply, and using a DC voltmeter, check for correct
voltage and polarity at pins 1, 2, & 3 of the barrier connector.
INTERNAL POWER SUPPLY.
If a plug-in power supply card is to be used, plug in the
supply card, and check for proper illumination of both the
positive and negative voltage LED's, on the power supply
card front panel.
3- Terminate all audio input and output connections, using
the card connection drawing on the facing page. Double
conductor shielded cable is recommended for all audio
connections. Terminate each unused input with a 1K ohm
resistor.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
GND
GND
GND
OUTPUT LO
OUTPUT HI
INPUT HI
INPUT LO
Page 3
GAIN