HITACHI 50GX49B
Manual de Servicio

2.4 Sub picture white balance (ROM4, ROM6, ROM8)

adjustment

Adjustment procedure (1) Check that the waveforms

shown below are at rear SP

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.

obtained (Input signal @ and a), Terminal Out.

(a) SP MATRIX RR

mode

RL

(b)

EXT mode RR -a I VPP

K

IV

w

RL

0

no signal

2.6 Raster Inclination

adjustment

(Deflection

Yoke)

Note:

If the sub picture has a signal sag, adjust level at center point. IV

MRllcN SAG �I ....._.... .4.... ENlER .. .. P0lN-l 9

Adjustment preparation The set�can face east or west. (2) Input the single cross test signal. Set video conditions to factory reset. The lens focus adjustment should have been completed. The electric focus should have been coarse adjusted. (6) The digital convergence RAM should be cleared (uncorrected state). With the TV set off, press and hold the service switch located on the Power/Deflection PWB and then press the power button. (7) Start adjustment 20 minutes or more after TV is turned on.

(1) I:; (5)

2.5 SP Matrix Check Adjustment preparation (1) Input the following audio signals to the audio input of the VIDEO INPUT terminals, when checking SP Matrix:

Adjustment procedure (1) Apply covers to the R and B lenses and project only green light. (2) Turn the G deflection yoke and adjust the vertical raster inclination. (3) Then, remove the cover of R or B lens and project red or blue light and green light together on the screen.

0
@

R ch: 435mVrms L ch: no signal

.

.
l

Set the AUDIO ADVANCED SETTING for INT. SPEAKERS: ON, LOUDNESS: OFF and PERFECT VOLUME: OFF. Set the volume control of FRONT to 20 step. Set the BALANCE, TREBLE and BASS to Normal. Front waveform: the set. front speaker output of

Note:

21