Hitachi DZ-GX20A Service Manual page 141

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
1) Choose WHITE BALANCE on the LCD ADJUSTMENT
MENU screen.
2) Click the EXECUTE button on LCD ADJUSTMENT
MENU screen to proceed with the SUB CONTRAST
RED ADJUSTMENT screen.
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.
4) After step 3) is complete, be sure to click the NEXT
button, and then proceed with the SUB BRIGHT RED
ADJUSTMENT screen.
Note that clicking the RETURN button will restore the
LCD ADJUSTMENT MENU screen to the status before
the adjustment was performed.
5) Use the same procedure as in step 3) to equalize levels c
and d of the waveform.
6) After step 5) is complete, be sure to click the NEXT
button, and then proceed with the SUB CONTRAST
BLUE ADJUSTMENT screen.
a
c
d b
Fig. 6-4-11 Waveform of LCD White Balance Adjustment
LCD ADJUSTMENT MENU screen
MANUAL ADJUSTMENT PROGRAM for SERVICE STATION
LCD ADJUSTMENT MENU
CONNECTION
SUB CONTRAST RED ADJUSTMENT
screen.
MANUAL ADJUSTMENT PROGRAM for SERVICE STATION
SUB CONTRAST RED ADJUSTMENT
4
CONNECTION
SUB BRIGHT RED ADJUSTMENT screen.
MANUAL ADJUSTMENT PROGRAM for SERVICE STATION
SUB BRIGHT RED ADJUSTMENT
6
CONNECTION
6 - 40
LCD ADJUSTMENT MENU
PLL
CONTRAST
BRIGHT
1
WHITE BALANCE
2
EXECUTE
RETURN
UP DOWN
3
NEXT
RETURN
UP DOWN
5
NEXT
RETURN