Marantz SR4000 Service Manual - Page 41

Fig 1

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8-4 8-4 D C A Surround 180˚ Info B 30 msec 25 msec Change time delay to 15 msec (only in versions with variable delay). he surround pulse in channel B moves to the left with respect to side from center marker (channel A) position. Change time delay to 25 or 30 msec (versions with variable delay). The surround pulse in channel B moves to the right with respect to center marker (channel A) position. Time delay with track 6 Alternative methode : The functional operation of the time delay can be made visible with a lisajous figure, with an single beam scope. Connect X-direction on Surround output Connect Y-direction on Left or Right output/input. Note : be careful and use only 1 ground connected to scope. Select track 6 (surround test) : Make the lisajous figure visible on the scope (amplitude adjust) see fig. 4 15 msec. 25 msec. 20 msec Center 0˚ Info 15 msec Marker ! No Time Delay Surround 180˚ Info 20 msec. Fig 4 Lisajous out of phase Time delay = OK Note : in sets with variable time delay the ellipse of the lisajous figure must be always open. Changing the time delay changes the direction of the circle accordingly. 30 msec 25 msec 20 msec Center 0˚ Info 15 msec Marker ! No Time Delay Surround 180˚ Info CHANNEL modes: Surround OFF (Stereo) 2 channel mode Signal on :L out (2703) and R out (2704) Surround ON -Prologic 4 channel mode all four outputs are used Signal on : L out (2703), R out (2704), Center out (2705), Surround (2706). -Front 3 stereo No surround speaker available The surround information is equelly to the left and right outputs. Signal on : L out (2703), R out (2704), Center out (2705). -HALL Signal on : L out (2703), R out (2704), Surround (2706). Subwoufer out. not in all versions Signal on : Subwoofer out (2788). (....) as indicated on the component side of the DPL decoder board. 40 msec fig 1c Result in Center / Surround channel Surround Amplifier Output 20 msec Center 0˚ Info 1 msec = 1kHz Output Amplifier Center Lt fig 1a Encoded signaal Rt fig 1b Fig 1 fig 1d

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8-4
8-4
Change time delay to 15 msec (only in versions with variable delay).
he surround pulse in channel B moves to the left with respect to side from center marker (channel A) position.
Change time delay to 25 or 30 msec (versions with variable delay).
The surround pulse in channel B moves to the right with respect to center marker (channel A) position.
Time delay with track 6
Alternative methode :
The functional operation of the time delay can be made visible with a lisajous figure, with an single beam
scope.
Connect X-direction on Surround output
Connect Y-direction on Left or Right output/input.
Note :
be careful and use only 1 ground connected to scope.
Select track 6 (surround test) :
Make the lisajous figure visible on the scope (amplitude adjust) see fig. 4
Lisajous out of phase
Fig 4
Time delay = OK
Note :
in sets with variable time delay the ellipse of the lisajous figure must be always open.
Changing the
time
delay changes the direction of the circle accordingly
.
CHANNEL
modes
:
Surround OFF
(Stereo)
2 channel mode
Signal on :L out
(2703) and
R out (2704)
Surround ON
-Prologic
4 channel mode
all four outputs are used
Signal on : L out (2703),
R out (2704),
Center out
(2705),
Surround (2706).
-Front 3 stereo
No surround speaker available
The surround information is equelly to the left and right outputs.
Signal on : L out (2703),
R out (2704),
Center out
(2705).
-HALL
Signal on : L out (2703),
R out (2704),
Surround
(2706).
Subwoufer out
.
not in all versions
Signal on : Subwoofer out
(2788).
(
....
) as indicated on the component side of the DPL decoder board.
15 msec.
25 msec.
20 msec.
1 msec = 1kHz
20 msec
20 msec
20 msec
40 msec
30 msec
30 msec
25 msec
25 msec
15 msec
15 msec
Lt
Surround
Amplifier
Output
Center
Amplifier
Output
Rt
Result in Center / Surround channel
Encoded
signaal
!
No Time Delay
!
No Time Delay
Marker
Marker
D
C
B
A
Surround 180˚
Info
Surround 180˚
Info
Surround 180˚
Info
Center 0˚
Info
Center 0˚
Info
Center 0˚
Info
Fig 1
fig 1d
fig 1c
fig 1a
fig 1b