10
Azimuth adjustment is difficult when using only a ‘scope. Rotate
the reader to adjust for the flattest perf trace and the lowest error
rate on the processor display. Large azimuth errors are seen as a
tipping of the ‘scope sprocket hole trace. The axis will be the
center of the displayed perf trace. The DRAS azimuth number
you are looking for is as close to zero as possible. Retighten the
clamp screw when both focus and azimuth have been optimized.
Final:
As a final check run Dolby Cat. 69T and observe both digital and
analog levels and the digital error rate.
Analog
:
You can go back and double-check the analog setup. Start as you
did before by checking lateral position. It should not have
changed, but if it has, it is OK to refine it. If you did refine it
make sure the Dolby Tone, equalization, scanning beam
illumination and lateral guide are still correct.
Digital
:
The last step is to fine adjust the rotation of the digital LED to
minimize the unevenness of the sprocket hole trace. Now run a
piece of film with a good sound track and go sit in the theater and
“test” some really fine sound.
