6
Adjust the lateral guide roller
Analog focus and azimuth alignment
Adjust the lateral guide roller
until you have agreement
between both the Cat. No. 97 and the “Buzz Track”. Adjust the
lateral position of the LED for maximum output from both
channels. The lateral guide position is important because it also
establishes the correct position for reading the digital track.
Move the LED in and out and vertically (rotationally) until you
have achieved the maximum output from both channels. Gently
tighten the clamp screw of the analog mount. Try not to overdo
the screw tightening so that the threads in the soft copper are not
deformed. There is a large area of contact between the copper
mount and the round stud on the support plate which means that
it takes only modest clamping pressure to firmly hold the
adjustment. (The other reason for this large contact area is that
there is very good heat transfer from the LED itself right on down
to the base casting of the sound head. This means extra long life
for the LED.)
Now is the time to do the rest of the
analog focus and azimuth
alignment
procedures. Before you do your final Dolby Tone
level adjustment, it is a good idea to run Dolby Cat. No.566
scanning beam illumination film. Touch up the in-and-out
adjustment of the LED if necessary. If you are sure that your
vertical, or rotational, adjustment is nearly correct, there is an
interesting method of optimizing it. Remove all film from the
projector and turn on the motor. Monitor the sound from the
reader and turn the gain up until you hear the slight microphonics
from the running projector. Tweak ever so carefully the vertical
position of the LED until the least sound is heard. This will be the
optimum position of the LED Lock the clamp screw, set your
Dolby Tone level and move on to the digital.
