Service manual
CD-C471
W
EXPLANATION OF DOLBY SURROUND PRO LOGIC AND EVALUATION METHOD
Outline
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Namely, two speakers are connected in parallel to one
amplifier.
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In the Pro Logic BYPASS mode the amplifierfor C-ch (center
channel) and the amplifier for S-ch (surround channel) are in
MUTE state. The SP output is cut.
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In the normal mode of Pro Logic ON mode the amplifiers for
C-ch
and S-ch are in operative state, so that the SP output
appears.
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In the Phantom mode of Pro Logic ON mode the amplifier for
C-ch is in MUTE state, so that the SP output is cut. The
amplifier for S-ch (surround) is in operative state, so that the
SP output appears
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State of element output and terminal output in specific mode
L
Dolby Pro Logic
Bypass mode
IC501
1
12 pin L-out Output enabled state
Dolby Pro Logic On mode
Normal mode
Phantom mode
Output enabled state
1
Output enabled state
11 pin R-out Output enabled state
Output enabled state
IC501’
/
9 pin C-out
1
No output
1
Output enabled state
Output enabled state
1
No output
IC501
/
10 pin S-out
/
No
OutDut
1
Output enabled state
/
Output enabled state
I
SP
OUT
I
L-ch
I
Output enabled state
I
Output enabled state
/
Output enabled state
(SO901)
R-ch ,Output enabled state
Output enabled state
Output enabled state
SP OUT C-ch
No output in MUTE
(Q604)
state Output enabled state
No output in MUTE
(Q604)
state
(SO901
)
SP OUT
S-ch
No output in MUTE (Q603) state
Output enabled state
Output enabled state
(SO901
)
Test tone output
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Pro Logic ON Normal mode
Press the remote control TEST TONE button.
--+Output
of only L-ch
+Output
of only C-ch
-r
1
Output of only S-ch
t
Output of only
R-ch
The test tone (noise) is repeatedly output for output period
(2 set).
In
this case the following indication appears repeatedly.
-TEST
+L-ch
-Gch
T
L
S-ch
t
R-ch
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Pro Logic ON Phantom mode
Press the remote control TEST TONE button.
+Output
of only L-ch
-tOutput
of only R-ch
I-
1
t
Output of only S-ch
The test tone (noise) is repeatedly output for output period
(2
set).
In this case the following indication appears repeatedly.
-+TEST
+
L-ch
+
R-ch
1‘
.L
t
S-cht
Relation between VIDEO IN input and output in Pro Logic
ON state
(1)
L-ch/R-ch
same phase input into VIDEO IN input jack in
VIDEO Function mode
Almost no output (only omitting component)
Almost no output (only omitting component)
(SO901)
SP out
C-ch
Input signal is output.
(50901) SP out
S-ch
Almost no output (only omitting
component)
(SO901)
SP
out C-ch
SP cut, no output
(SO901)
SP
out
S-ch Almost no output (only omitting component)
(2)
L-ch/R-ch
reverse phase input into VIDEO IN input jack in
VIDEO Function mode
(Reverse phase: Phase difference between
L
and
R
is
180”)
Almost no output (only omitting component)
Almost no output (only omitting component)
(SO901)
SP
out C-ch
Almost no output (only omitting component)
(SO901)
SP
out
S-ch
Input signal is output.
Output point
Phantom mode
SP
out
L-ch
1
Almost no output (only omitting component)
(SO901)
R-ch Almost no output (only omitting component)
(SO901)
SP
out C-ch
SP
cut, no output
(SO901)
SP
out
S-ch Input signal is output.
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Accordingly, if you want to output signal waveform to C-ch SP
out, give the same phase input into
L-ch/R-ch
INPUT in the
Pro Logic Normal mode.
If one of channels receives input, C-ch does not output. Only
L-ch or
R-ch
outputs.
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If you want to output signal waveform to
S-ch
SP out, you can
use either Normal mode or Phantom mode. However, 180”
reverse phase input must be given to
L-ch/R-ch
INPUT.
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