Sony MDDISCAM DCM-M1, Service Manual

Page: 150 / 198

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5. Brightness 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 3-01-04
Screen display 10-step gradation pattern (white/black)
Measurement point Adjusting monitor jig
G
pin (VG)
Measuring instrument Oscilloscope
Adjustment data 7C
initial value
Adjustment value A = 1.40
±
0.05 Vp-p
Note:
This is the tracking adjustment in relation to “6. Contrast
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 “3-01-04”.
3) Press the DSPL key to display the 10-step gradation pattern
(white/black) on the LCD screen.
4) Connect the adjusting monitor jig A pin (XTST) and E pin
(GND).
5) Using
e
and
E
keys, change the adjustment data so that the
voltage (A) between pedestal (0 IRE) and GAMMA1 limiter
level satisfies the adjustment value.
6) Press
y
key to write the adjustment data.
7) Disconnect the adjusting monitor jig A pin (XTST) and E
pin (GND).
8) Press the DSPL key to return the LCD screen to the test mode
screen.
9) Check that the adjustment value of “Contrast Adjustment” is
satisfied.
If not satisfied, perform “Contrast Adjustment”.
Fig.7-1-13
Pedestal(0 IRE)
GAMMA1
limiter level
A
2H
4. RGB D Range Adjustment
Set the D range of RGB decoder driver step-wise output that drives
the
LCD to proper value.
If deviated, the LCD screen will be black blurring or white blur-
ring.
Item number 3-01-03
Screen display 10-step gradation pattern (white/black)
Measurement point Adjusting monitor jig G pin (VG)
Measuring instrument Oscilloscope
Adjustment data 80
initial value
Adjustment value A = 3.00
±
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 “3-01-03”.
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 of inverted waveform and ped-
estal of non-inverted waveform 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.7-1-12
2H
Pedestal
Pedestal
A