4
MODIIB STEREO PROCES-
TIONS section). Jumper H2 is used to select whether
or not the 3-D feature is on or off for Mono mode
when the processor is powered on (see diagram).
Units are shipped to power up with the 3-D function
active. Either way, the 3-D feature can be activated or
disabled by simply pushing the
3-D button on the Format Card. By toggling the 3-D
feature on and off, you can hear the difference the 3-D
process makes. If the 3-D feature is activated, the but-
ton will remain lit all the time, but
the 3-D “action” is only used in
Mono mode and only if the option-
al 3-D Mono card has been
installed. Without the optional 3-D
Mono card, the 3-D button has no
effect in Mono mode. In Stereo,
Digital and Music modes, the 3-D
“action” is not part of the signal processing.
DUAL PROJECTOR PREAMP CARD:
MOD4x300
There are two stereo solar cell preamplifiers in the MODIIB. Each preamplifier channel is
equipped with slit-loss correction. The Stereo-optical preamplifiers on this card increase the
incoming level from the stereo solar cells. Electronic changeover circuitry between stereo pairs
is built on the card to allow use in dual projector booths. If the MODIIB is installed in a single
projector booth, leave the second projector inputs unconnected.
The Dual Projector Preamp Card has two solar cell preamplifier gain controls (marked L1 G,
etc.) and two slit-loss correction controls (marked L1
HF, etc.) for each projector. There is sufficient gain
built into the preamps for narrow slit optical sound
lenses when the exciter lamp is run at 80% of its rated
value. The card is silk screened to make it easier to see
the location of each preamplifier gain and slit-loss cor-
rection control pot.
MONO/BACKUP CARD:
MOD2x305
The MONO/BACKUP card provides the necessary
frequency response shaping and level shifting to pro-
vide a quality mono signal from mono prints. In addi-
tion, a special open ended noise reduction circuit
called Dynamic Noise Reduction is used to eliminate
much of the “hiss” and film scratch noise often pre-
sent on film.
The MONO/BACKUP card contains the necessary circuitry for the emergency backup system in the event of loss
of sound within the MODIIB processor. The multi-turn pot on this card is for setting the emergency backup level.
Jumper H3
Jumper H2
