Sony DCM-M1 Service Manual page 151

6. Contrast Adjustment
Set the VIDEO signal level that drives the LCD to proper value.
If deviated, the LCD screen will be unclear, black blurring, or white
blurring.
Item number 3-01-05
Screen display 10-step gradation pattern (white/black)
Measurement point Adjusting monitor jig G pin (VG)
Measuring instrument Oscilloscope
Adjustment data D5
initial value
A = 2.54 ± 0.05 Vp-p
Adjustment value
Note: This is the tracking adjustment in relation to "5. Bright-
ness Adjustment".
Adjusting method
1) Select major item number "2" (EVF), and set the 10-step gra-
dation pattern (white/black).
2) Select the item number "3-01-05".
3) Press the DSPL key to display the 10-step gradation pattern
(white/black) on the LCD screen.
4) Using e and E keys, change the adjustment data so that the
voltage (A) between pedestal (0 IRE) and 100 IRE satisfies
the adjustment value.
5) Press y key to write the adjustment data.
6) Press the DSPL key to return the LCD screen to the test mode
screen.
7) Check that the adjustment value of "Brightness Adjustment"
is satisfied.
If not satisfied, perform "Brightness Adjustment".
100 IRE
A
Pedestal(0 IRE)
Fig.7-1-14
2H
7. V-COM Level Adjustment
Set common electrode drive signal level of the LCD panel to proper
value.
Item number
Screen display
Measurement point
Measuring instrument
Adjustment data
initial value
Adjustment value
Adjusting method
1) Select major item number "2" (EVF), and set the 10-step gra-
dation pattern (white/black).
2) Select the item number "3-01-06".
3) Press the DSPL key to display the 10-step gradation pattern
(white/black) on the LCD screen.
4) Using e and E keys, change the adjustment data so that the
V-COM signal level satisfies the adjustment value.
5) Press y key to write the adjustment data.
6) Press the DSPL key to return the LCD screen to the test mode
screen.
A
– 11 –
3-01-06
10-step gradation pattern (white/black)
Adjusting monitor jig F pin
(PANEL COM)
Oscilloscope
A8
A = 4.95 ± 0.05 Vp-p
2H
Fig.7-1-15