13
INSTALLATION & OPERATION
for left and both LED’s for right are on simultaneously.
There are preamp testpoints located just to the right of the
calibration LED’s to which you may hook up an AC volt-
meter to accurately measure the preamp levels. The correct
level for Dolby tone is 707 mV AC.
SURROUND NULL:
Make sure the MATRIX CARD is plugged back into its
slot. Set the SURROUND NULL switch on the Front Panel
Display Card to ON. While running the CAT. # 69 Dolby
tone adjust the NULL trimpot on the MATRIX CARD for a
minimum signal observed on the Left Surround LED array
on the front of the MOD V. Switch the Surround Null back
to off when finished.
BYPASS:
Listen to the CENTER channel on the booth monitor.
Switch from normal to backup (the Red switch on the Sub-
Bass Card) and adjust the backup level pot on 305 Mono
Card to achieve equal levels while switching from Normal
mode to Backup mode while running a film soundtrack.
This completes the “A” Chain and BYPASS calibrations.
OPERATING INSTRUCTIONS
The MOD V system is one of the easiest systems to operate.
The Manager/Operator of the sound booth should review
the operation instructions to assure that emergency func-
tions are also understood, should they ever be needed.
TURNING ON THE SYSTEM:
The sound engineer who installed the sound system has pro-
vided a way to apply power to the system through a master
power switch or circuit breaker. Also, several of the individ-
ual components in the equipment rack have their own power
switches. Become familiar with all switches or breakers that
control power to the sound equipment.
If the components are normally turned on individually, it is
important that the processing components are turned on first
and the power amplifiers are turned on after all other com-
ponents are on for a few seconds. This will allow time for
the low level circuits to stabilize so that the power ampli-
fiers will not pass a “turn-on thump” to the auditorium
speakers. Repeat in reverse order when turning off the sys-
tem.
MUSIC SELECTION:
It is likely that the sound system will be turned on before
the arrival of the first audience of the day. The MOD V
powers up in Music mode. If the music player (CD player or
tape machine) is running, music will be heard in the audito-
rium and on the booth monitor. MUSIC may also be select-
ed by pressing the front panel Music button.
PROGRAM SELECTION:
The automation should be set to select the proper formats
when needed. However, any format may be overrided by
simply pushing one of the Format buttons located on the
front of the MOD V.
EMERGENCY BYPASS SWITCH:
The MOD V contains a backup system that will keep the
show sound on the screen in the event of a failure of the
processor. This special circuitry is located on the MONO
card in the main card cage unit and is activated by the red
NORMAL-BACKUP switch located on the Sub-Bass
Expander card at the far right slot in the MOD V chassis.
MASTER FILM FADER:
This control is located on the MOD V Front Panel and is
used to set the system level for any film format, but not for
music level.
FORMAT LEVEL TRIMS:
These front trim controls can be used to make minor volume
changes to any of the formats. The MUSIC control serves as
the master fader for music level, and is a full range volume
control.
AUTOMATIC SURROUND GENERATOR:
The MOD V system may contain an optional surround gen-
erator for monaural soundtracks when the system is placed
into the GEN mode of operation. This circuit needs no
adjustment by the installer or operator.
SERVICE
CAUTION:
Service instructions are included for use by qualified per-
sonnel only. To avoid electrical shock, do not perform ser-
vicing other than that described within the Operating
Instructions unless you are qualified to do so. Refer all such
servicing to qualified service personnel.
Repairs to this product should be performed in accordance
with applicable safety standards, and should be performed
only by a trained service technician.
Most components used in the MOD V are available locally
The front of the MOD V is where the Master Film Fader,
Format Level Trims, Format Select Buttons, and individual
channel LED indicators are located.
