2. Calibrate oscilloscope to processor:
a) Thread a loop of Cat. No. 69P test film into projector and reader; start machine.
b) Select Channel 2 for display.
c) Adjust the horizontal position to line up the inside edge of the left “goal post” with the left edge
of the graticule.
d) Adjust the sweep vernier to line up the inside edge of the right “goal post” with the right edge of the
graticule.
e) Adjust the vertical position for the baseline of the clamp signal (Channel 2) to coincide with
a line in the lower section of the graticule.
f)
Select either
Alternate
or
Chop
to give the brightest display of both channels.
g) Adjust the vertical position of the video signal (Channel 1) to coincide with the same line as the
clamp signal.
3. Alignment of the Reader:
a) Rotate the horizontal positioning locknut and roughly adjust the lateral position of the CCD board
so that the outer trace (perf) is centered between the “goal posts.” This is approximate, and will
be repeated later for accurate positioning.
b) Rotate the L.E.D. mounting assembly for maximum amplitude on the upper trace without
sacrificing flatness. The trace should vary one block or less (± .5 volt). As shown, Figure B is
improved from Figure C. Amplitude, as measured with the top trace, should be between 2-5
volts from baseline. Adjust the digital L.E.D. for minimum ripple on the upper trace of the video
signal. As shown, Figure B is improved from Figure A.
c) If available, use DRAS10 software and a laptop computer to view the adjustment of azimuth for a
zero degree reading. Or, center the reader rotation between sync lost points using the error rate
of the Digital Processor to indicate lost sync.
d) Adjust focus for darkest center in area of bits (grass). Confirm highest reading with DRAS.
e) Confirm calibration of oscilloscope as above. Readjust the lateral position to align the outer
trace to one minor division (2/10) left of center between the “goal posts.” Figure B is improved
from Figure D.
4. Final Analog:
Check the lateral alignment, as initially set using the “Buzz Track,” and correct as required.
Confirm the L.E.D. positioning by setting the oscilloscope for “X-Y” display and running the
Dolby Cat. No. 97 loop. A “cross” should appear on the screen. When both the horizontal and
vertical lines are straight and of uniform length, the optimum position has been reached. Repeat
the tests for focus, azimuth, equalization, and “Dolby” level set. A difference may be noted in that
the high frequency range is extended, and very little high frequency boost will be required.
13
Summary of Contents for APOGEE
Page 17: ...12 Figure B is in optimal alignment ...
Page 35: ...30 FILM TRAP Assembly No 52 00223 ...
Page 39: ...34 APOGEE LENS TURRET Assembly No 52 00279 ...
Page 45: ...CONTROL CABINET Wiring Diagram 40 ...
Page 54: ...OIL PUMP ASSEMBLY 49 ...
Page 63: ......