Sony MDDISCAM DCM-M1, Service Manual

Page: 151 / 198

– 11 –
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
Adjustment value A = 2.54
±
0.05 Vp-p
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”.
Fig.7-1-14
Pedestal(0 IRE)
100 IRE
A
2H
7. V-COM Level Adjustment
Set common electrode drive signal level of the LCD panel to proper
value.
Item number 3-01-06
Screen display 10-step gradation pattern (white/black)
Measurement point Adjusting monitor jig F pin
(PANEL COM)
Measuring instrument Oscilloscope
Adjustment data A8
initial value
Adjustment value A = 4.95
±
0.05 Vp-p
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.
Fig.7-1-15
A
2H