2.4Sub 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.

2.5Surround Check Adjustment preparation

(1)Input the following audio signals to the audio input of the VIDEO INPUT terminals.

lWhen checking surround:

@L CH: No signal

@R CH: 400Hz sine wave 1 Vpp.

l Set the AUDIO ADVANCED SETTING for INT.

SPEAKERS ON,DYNAMIC BASS OFF, LOUDNESS OFF and PERFECT VOLUME OFF

lSet the volume control of FRONT to around the

center.

lSet 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(400Hz)

R(400Hz)

I24

Note: Monaural check can be omitted. The rear and center have no output.

2.5.3 Matrix surround check

Adjustment procedure

(1) Set to SURROUND: MATRIX

l Check that the following waveforms are obtained. (Input signal @I and @ ).

l 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.

FRONTREAR

:mrn

Note: Center has no output.

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Hitachi 60SBX78B, 50SBX78B service manual Repeat for P832 and ROM6 Green, P862 and ROM4 for Red, Point, Frontrear, Mrn

60SBX78B, 50SBX78B specifications

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