INSTALLATION & OPERATION
11
If you have a second projector, repeat the above steps except
hook your solar cell wires to the -RIGHT2, +RIGHT2, -LEFT2
and +LEFT2 inputs.
DOUBLE CHECK your work to see that the solar cell leads
arrive at the proper terminals. A reversal of leads will
cause very strange results. You may hear the center
channel information through the surround speakers, the
surround through the stage, and the left channel out of
phase with the right. This is a common error, so verify
correct wiring before proceeding.
Two Projector Systems
Connect the
CHANGEOVER
and
GROUND
terminals on
the MOD 7a
AUTOMATION
terminal strip to the booth
automation changeover relay terminals.
Projector changeover is accomplished by using only a
single pair of wires and either a manual switch or relay
contacts in the automation system. A relay closure in the
automation equipment will execute a changeover by
grounding the
CHANGEOVER
terminal. Run a two-
conductor shielded cable to the dry contacts of the
automation projector changeover relay. On the other end,
connect one wire to the
CHANGEOVER
terminal on the
MOD 7a. Ground the other wire to the nearest ground
terminal on the MOD 7a. Connect the shield of the wire, on
the MOD 7a end, to a ground terminal. Cut off the shield on
the automation end. When the automation relay closes,
Projector Two of the MOD 7a will be enabled, and the first
pair of stereo preamplifiers (Projector One) will be dis-
abled. Releasing the relay will cause the reverse action to
occur. In other words, Projector One is always ON until the
CHANGEOVER
terminal is grounded. The
CHANGEOVER
Connecting the MOD 7a to a Reverse Scan
terminal must be tied to ground to activate Projector Two. It is
not a pulse-toggled input.
TWO PROJECTOR SYSTEMS - NO AUTOMATION:
Rig a single pole, single throw switch between the
CHANGEOVER
terminal and a
GROUND
terminal.
When the switch is open, Projector 1 will be active, when it
is closed, Projector 2 will be active.
NOTE : Changeover between projectors is done electroni-
cally in the MOD 7a. This necessitates that BOTH exciter
lamps be lit at the same time. No exciter light changeover is
provided in the unit. An exciter light changeover has at
least 3 dB more circuit noise than an electronic changeover
and is NOT recommended in high quality systems.
Non-Sync Music Connections
The non-sync music inputs for the MOD 7a are run through
the Circle Surround matrix to generate 5.1 channels of
auditorium music. Connect your stereo music source (CD
player, tape, etc.) to the MUSIC LEFT and MUSIC RIGHT
inputs on the back of the MOD 7a.
Occasionally, a theater may use a monaural sound player
such as a background music cartridge player or satellite
music service that does not have stereo capabilities. In this
event, connecting a mono signal into both LEFT and RIGHT
MUSIC inputs will generate music in the center channel
only.
SMART recommends using a stereo distribution amplifier
such as the
SMART DA226
to feed signals from one music
source to multiple sound processors.
Automation Connections
Connect the format pins on the AUTOMATION terminal
strip of the MOD 7a to the systems corresponding automa-
tion relay terminals.
A momentary ground contact on one of the FORMAT
SELECT inputs on the rear of the MOD 7a will switch the
processor to any desired format, including music. The
EX
format select terminal will toggle between EX ON and EX
OFF when pulsed to ground.
Note: The MOD 7a powers up in Non-Sync Music mode.
Muting Function
A convenient
MUTE
terminal in the AUTOMATION
section of the back panel allows all output channels of the
MOD 7a to be silenced whenever this terminal is grounded.
