Protech Audio 901 - Manual

PROTECH
MODELS COVERED
®
INTEGRA III SYSTEM
MODEL 901
MODULAR MATRIX MIXING CARD
INSTALLATION & OPERATION MANUAL
901
The Model 901 Modular Matrix Mixing Card is
designed for use in professional audio applications. Each
unit features four (4) selectable music inputs, three (3)
paging inputs, one (1) line level output, and a switch
closure circuit for control of priority bypass relays.
Typical applications are public address systems in build-
ings such as airports, factories, hospitals, courthouses,
casinos, convention centers, libraries, hotels, racetracks,
and office buildings.
The mechanical construction of the Model 901 allows
mounting of up to ten (10) units in a standard Model 857B
Card Frame, or 9 units in a Model 858B Card Frame. Each
Model 901 card unplugs from the front of the card frame,
without the need for removing any wires from the rear of the
card frame. Spare units may be placed into service in a
matter of minutes.
Each Model 901 has four user adjustable features, in
addition to the actual wiring hierarchy. There are two level
adjustments, one for the page output level, and one for the
music output level. There is one four position DIP switch
for selecting any of four music input channels, or no music
input at all. The fourth adjustment is the push-on jumper
which allows public paging to enter a zone. The Model 901 Modular Matrix Mixing Card is built using two
separate printed circuit board assemblies. The two boards are
connected together using a high quality, gold-plated 15 pin
connector. The main printed circuit board contains all audio
input and output connection points, the page output level
adjustment, the public add enable jumper, and all relay control
circuitry. The smaller printed circuit board is piggy-backed to
the main printed circuit board, and contains all background
music channel circuitry, including the channel selector switch
and the background music level adjusting trimpot.
All integrated circuits used in the Model 901are mounted in
plug-in IC sockets, to facilitate maintenance of the system.The
DC power supply connections are protected by self-resetting
electronic fuses. If a card should malfunction, the electronic
fuses will disconnect the card from the power supply. The
same type of fusing is provided in the priority bypass relay
control circuit.
Other INTEGRA III SYSTEM cards, such as distribution
amplifiers or compressors, may be used in the same card frame
assembly, to allow construction of complete audio systems.
Each of these products is designed to provide the user
with high quality audio, for years of uninterrupted
service.
1/02
Model 901 Shown
Protech Audio Corporation, PO Box 597, 192 Cedar River Road, Indian Lake, New York, 12842, Voice 518-648-6410 Fax 518-648-6395
www. protechaudio . com