Dolby Laboratories CP650 Installation Manual Page 90

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Dolby
®
Model CP650 Installation Manual A-Chain Alignment
5-10
A
u
t
o
Slit
-
l
oss
EQ
Projector P1
P1P1
P1
Press OK when ready.
A
u
t
o
Slit
-
l
oss
EQ
Level Adjust done.
Press OK to save the
current settings.
M
anua
l
Slit
-
l
oss
EQ
Projector 1
>
>>
>Channel: Left
Value: xx
5.10 Optical HF Equalization (Slit-Loss EQ)
This step adjusts the high-frequency response of the optical preamplifier circuit. The
CP650 provides both automatic and manual facilities for optical, or slit-loss, high-
frequency equalization. The Auto menu appears first:
Auto Slit-Loss EQ
Continue to play the Cat. No. 69 P pink-noise
test film.
Projector 1:
OK
OK
Move the CP650 menu display to Auto Slit-
Loss EQ for Projector 1.
Press the OK button to begin automatic
equalization. The HF response on both the Left
and Right channels are automatically
equalized. You can observe the action on the
scope RTA display. Dots shown on the front-
panel display show progress. When the dots
reach the end of the line, the Right channel is
automatically equalized.
When EQ is completed, as shown on the
display, press the OK button to save the
settings.
menu
OK
Press the left menu button to move to the
Projector 2 menu and repeat the procedure
above if a second projector is installed.
Manual Slit-Loss EQ
menu
OK
The next menu is used for manually adjusting
the slit-loss EQ.
Projector 1:
menu
OK
Left / Right
menu
OK
Adjust EQ
Use the center menu button to chose between
the channel to be adjusted and the setting
(value).
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