Sony DCM-M1 Service Manual page 147

4. Contrast Adjustment
Set the VIDEO signal level that drives the LCD to proper value.
If deviated, the EVF screen will be unclear, black blurring, or white
blurring.
Item number 2-01-03
Screen display 10-step gradation pattern (white/black)
Measurement point Adjusting monitor jig B pin (G)
Measuring instrument Oscilloscope
Adjustment data B5
initial value
A = 2.1 ± 0.1 Vp-p
Adjustment value
Adjusting method
1) Set the 10-step gradation pattern (white/black).
2) Select the item number "2-01-03".
3) Press the DSPL key to display the 10-step gradation pattern
(white/black) on the EVF 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 EVF screen to the test mode
screen.
100 IRE
A
Pedestal(0 IRE)
Fig.7-1-9
2H
5. Backlight Consumed Current Adjustment
Set the brightness of backlight.
If deviated, the picture will be too dark or too bright.
Item number
Screen display
Measurement point
Measuring instrument
Adjustment data
initial value
Adjustment value
Note: After turning on the power, wait for more than 30 seconds,
and then start the adjustment.
Adjusting method
1) Set the 10-step gradation pattern (white/black).
2) Select the item number "2-01-04".
3) Press the DSPL key to display the 10-step gradation pattern
(white/black) on the EVF screen.
4) Using e and E keys, change the adjustment data so that po-
tential difference (A) between adjusting monitor jig D pin
(BL+) and C pin (BL–) satisfies the adjustment value.
5) Press y key to write the adjustment data.
6) Press the DSPL key to return the EVF screen to the test mode
screen.
6. White Balance Adjustment
Adjust the white balance properly.
If deviated, the color reproducibility of EVF screen will be poor.
Item number
Screen display
Measurement point
Measuring instrument
Adjustment data
initial value
Adjustment value
Note: To switch between R data and B data, press u key.
After the adjustment finished, move to other item with R
data kept displayed.
Adjusting method
1) Set the 10-step gradation pattern (white/black).
2) Select the item number "2-01-05".
3) Set the adjustment data to initial value (R data:97, B data:57).
Note: Each time the data is set, press y key to write data to
nonvolatile memory.
4) Press the DSPL key to display the 10-step gradation pattern
(white/black) on the EVF screen.
5) Check that the EVF screen is not colored.
If colored, change the adjustment data by using e and E keys
so that the EVF screen is not colored.
Note: Each time the data is set, press y key to write data to
nonvolatile memory.
6) Press the DSPL key to return the EVF screen to the test mode
screen.
– 7 –
2-01-04
10-step gradation pattern (white/black)
+ probe: Adjusting monitor jig D pin
– probe: Adjusting monitor jig C pin
Digital voltmeter
B8
A = 21.0 ± 1.0 mV
2-01-05
10-step gradation pattern (white/black)
Check on the EVF screen
R data: 97
B data: 57
EVF screen must not be colored
(BL+)
(BL–)