Hitachi DZ-GX5020A K Service Manual page 123

Adjustment > Adjustment Procedure
(5) LCD White Balance
Preparations:
1) Connect the oscilloscope CH1 to "LCD-R
(pin 14)" of Halcyon connector.
2) Connect the oscilloscope CH2 to "LCD-G
(pin 13)" of Halcyon connector.
3) Connect the oscilloscope EXT TRIG to video
output.
4) Switch the oscilloscope V-MODE to "ALT"
and TRIGGER SOURCE to "EXT".
5) Set the switches and knobs on oscilloscope
so that the CH1 and CH2 waveforms appear
as shown in Fig. 6-4-11.
Procedure
LCD ADJUSTMENT MENU screen
MANUAL ADJUSTMENT PROGRAM for SERVICE STATION
LCD ADJUSTMENT MENU
LCD ADJUSTMENT MENU
PLL
CONTRAST
BRIGHT
WHITE BALANCE
2
EXECUTE
CONNECTION
1) Choose WHITE BALANCE.
2) Click the EXECUTE button.
1
RETURN
6 - 38
SUB CONTRAST RED ADJUSTMENT
screen.
MANUAL ADJUSTMENT PROGRAM for SERVICE STATION
SUB CONTRAST RED ADJUSTMENT
UP
3
4 NEXT
CONNECTION
3) Click the UP and DOWN buttons so that
level a of CH1 waveform is equal to level b of
CH2 waveform. Click the button at approx.
2-second intervals while checking any
increase or decrease in level a.
a
c
d b
Fig. 6-4-11 Waveform of LCD White Balance
Adjustment
4) After step 3) is complete, be sure to click the
NEXT button.
Note that clicking the RETURN button will
restore the LCD ADJUSTMENT MENU
screen to the status before the adjustment
was performed.
DOWN
RETURN