Hitachi DZ-GX20A Service Manual page 139

Adjustment > Adjustment Procedure
(3) LCD Brightness
Preparations:
1) Connect the oscilloscope CH2 to "LCD-G (pin 13)" of
Halcyon connector.
2) Switch the oscilloscope V-MODE to "CH2": Leave the
TRRIGER SOURCE in "CH1" as is.
Procedure:
1) Choose BRIGHT on the LCD ADJUSTMENT MENU
screen.
2) Click the EXECUTE button on LCD ADJUSTMENT
MENU screen to proceed with the BRIGHT
ADJUSTMENT screen.
3) Click the UP or DOWN button so that the value of level
B of waveform is 2.35V ± 0.1Vp-p. Click the button at
approx. 2-second intervals while checking any increase
or decrease in level B.
4) After step 3) is complete, be sure to click the SAVE
button.
Note that clicking the RETURN button will restore the
LCD ADJUSTMENT MENU screen to the status before
the adjustment was performed.
5) When save is complete, the ADJUSTMENT FINISHED
dialog will appear: Click the OK button in dialog to
restore the LCD ADJUSTMENT MENU screen.
[Before Adjustment]
[After Adjustment]
Fig. 6-4-9 Waveform of LCD Bright Adjustment
B
B = 2.35V ± 0.1Vp-p
LCD ADJUSTMENT MENU screen
MANUAL ADJUSTMENT PROGRAM for SERVICE STATION
LCD ADJUSTMENT MENU
CONNECTION
BRIGHT ADJUSTMENT screen
MANUAL ADJUSTMENT PROGRAM for SERVICE STATION
BLIGHT ADJUSTMENT
4
CONNECTION
ADJUSTMENT FINISHED dialog
FINISHED
ADJUSTMENT FINISHED.
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LCD ADJUSTMENT MENU
PLL
CONTRAST
1
BRIGHT
WHITE BALANCE
2
EXECUTE RETURN
UP DOWN
3
SAVE RETURN
5
OK