Hitachi DZ-HS303A Service Manual page 142

Adjustment > Adjustment Procedure
(2) LCD Contrast-1
Note:
Be sure to adjust LCD brightness and LCD
contrast-2 after completing LCD contrast-1
adjustment.
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
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 CONTRAST.
2) Click the EXECUTE.
1
RETURN
6 - 36
CONTRAST ADJUSTMENT screen
MANUAL ADJUSTMENT PROGRAM for SERVICE STATION
CONTRAST ADJUSTMENT
UP
3
4
SAVE
CONNECTION
3) Click the UP or DOWN button so that
the value of level A of waveform is 2.20V
± 0.02Vp-p. Click the button at approx.
2-second intervals while checking any
increase or decrease in level A.
A = 2.20V ± 0.02Vp-p
Fig. 6-4-8 Waveform of LCD Contrast-1 Adjustment
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.
ADJUSTMENT FINISHED dialog
FINISHED
ADJUSTMENT FINISHED.
5
OK
5) Click the OK button in dialog to restore the
LCD ADJUSTMENT MENU screen.
DOWN
RETURN