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2.4 Sub picture white balance adjustment
(ROM4, ROM6, ROM6)
Adjustment preparation
(1) Start adjustment after power is ON for 20
minutes.
(2) Use a white raster signal for adjustment.
(3) Press “FREEZE” on the remote control and
select “SINGLE” freeze mode to display the sub
picture.
(4) Set CONTRAST to Maximum, Other conditions
to center.
Adjustment procedure
(1) Connect oscilloscope to P802 and adjust ROM8
to match blue level of main and sub pictures.
(2) Repeat for P832 and ROM6 Green, P862 and
ROM4 for Red.
Note: If the sub picture has a signal sag, adjust level at
center point.
2.5 Surround Check
Adjustment preparation
(1) Input the following audio signals to the audio
input of the VIDEO INPUT terminals.
l
When checking surround:
@ L CH: No signal
@ R CH: 400Hz sine wave 1 Vpp.
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Set the AUDIO ADVANCED SETTING for INT.
SPEAKERS ON,DYNAMIC BASS OFF,
LOUDNESS OFF and PERFECT VOLUME OFF
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Set the volume control of FRONT to around the
center.
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Set the BASS, TREBLE and BALANCE to center.
Note:
Front waveform: Front speaker output of the
set.
2.5.1 Surround off check
Adjustment procedure
(1) Set to SURROUND: OFF and check that the
waveform shown below is obtained (Input signal
@ and @ ).
FRONT
(5kHz)
R (400Hz)
Note: The rear and center will have no output.
2.5.2 Surround off/monaural check
Adjustment procedure
Check that the following waveform is obtained. The
amplitudes of 2 channels are equal.
(Input signal @ only).
FRONT
L
R
I24
Note: Monaural check can be omitted. The rear
and center have no output.
(400Hz)
(400Hz)
2.5.3 Matrix surround check
Adjustment procedure
(1) Set to SURROUND: MATRIX
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Check that the following waveforms are obtained.
(Input signal @I and @ ).
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Front: Check that the phases of R and L are
different and 400Hz is superimposed on
5kHz. The amplitudes of R and L are
different.
l
Rear: Check that the phases of R and L are
opposite and 400Hz is superimposed on
5kHz. The amplitudes of R and L are
different.
FRONT
REAR
:mrn
Note: Center has no output.
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