Protech Audio 589 - Manual (Page 2)

INSTALLATION
Page 2
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, 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 the remains is the alignment.
ALIGNMENT
INSTALLATION
The 589 Audio Controlled Switching Card is designed
to be mounted in the Model 857B Card Frame, or
the Model 858B Card Frame.
The Model 857B Card Frame will accomodate up to 10
audio cards, and requires an external power supply.
The Model 858B Card Frame 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 termi-
nation 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.
The actual steps necessary for installation of the Model
589, 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.
The model 589 has been shipped from the factory with;
1-Input selector switch (S1) in the line position.
2-Gain Aligned for Unity
3-Threshold selector switch (S2) in the On-Board position.
4-Threshold adjustment set for -20dB.
5-Contact selector switch (S3) in the relay position.
If additional gain is required, the following alignment proce-
dure is recommended;
1- Remove the card from the card frame, and realign
switches to desired positions.
2- Replace card in slot.
3- Apply a signal representative of the actual signal to be
used, to the input.
4- While monitoring the output, turn the gain trimpot clock-
wise until the desired output level is reached.
5- Adjust threshold trimpot as required. The green LED
indicates the threshold/switch action.
6- Adjust dropout delay as necessary.
This completes the installation and alignment of the audio
controlled switching card. The cards may be expected to
deliver years of uninterrupted service.
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.