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MARCH
"74
8.13
Adjustment
:
To
adjust,
loosen
screw
in rewind
lever
Lubricate
fiber
gear
teeth with
silic-
one
or other
fine
oil.
Wipe
off excess.
SOUND PICK-UP
Function
:
Check
;
Adjustment
17
It
is best
to
remove
lamp
house
frame
casting
312-32111
for adjustments
of
optical
sound
lens.
Install
an 8 ohm 10W resistor
across
speaker
output.
Connect
a low
reading
AC voltmeter
and
an
Oscilliscope
acro-
ss
resistor,
with
projector
operating,
set
meter
and
scope
for
convenient
reading
with
volume
control
at
approx.
"9;00
o'clock"(1/4
rotation)
and
treble
control
at maximum,
Loosen
screw
in
lens
holder
bracket
ST-40011,
thus
allowing
lens
to be
moved.
Rotate
lens
for azimuth
adjust-
ment.
Observe
clean
sine
wave
pattern
on
Oscilliscope.
Set
for
maximum
read-
ing.
Slide
lens
up or down
for
focus.
Observe
meter
reading
or
Oscilliscope
amplitude.
Set
for
maximum
reading.
After
obtaining
maximum
reading
on
both
azimuth
and
focus
with
simultane-
ous
adjustment,
tighten
screw
to
clamp
lens.
Observe
meter
or
scope.
Out-put
should
not
drop.
Seal
set
screw
with
paint.
Check
:
Scanning
beam
must
fall
on
center
of
optical
sound
track
of
film.
Excessive
noise
will
be heard
together
with
dis-
torted
sound
if
scanning
beam
position
is incorrect.
Use SMPTE "JIFFY"
test
film
to
check.
It
contains
a section
of
Buzz
Track
Test
Film.
Adjustment
:
To
adjust,
use
SMPTE
PH
22.57
Buzz
Track
Test
Film.
A 1m(3')
length
to
form
a loop
is
convenient.
(SMPTE
"JIFFY
Test
Film
may
be
used.)
Sound
lens
bracket
is mounted
on
two
pins
which
slide
into
holes
of main
casting.
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