Contrast Adjustment (Vf-115 Board); Backlight Consumption Current Adjustment; (Vf-115 Board) - Sony DCR-TRV7 Service Manual

4. Contrast Adjustment (VF-115 Board)

Set the level of the VIDEO signal for driving the LCD to the specified
value. If deviated, the screen image will be blackish or saturated
(whitish).
Mode Camera
Subject Arbitrary
Pin !ª of CN9928 (EVF VG) on
Measurement point
CB-58 board
Measuring instrument Oscilloscope
Adjustment page D
Adjustment address 72
A = 1.35 ± 0.1V (NTSC)
Specified value
A = 1.25 ± 0.1V (PAL)
Connection:
1) Connect Pin !ª and Pin !¶ (GND) of CN9928 with a
3.3 kΩ resistor.
3.3 kΩ resistor: 1-249-423-11
Adjusting method:
1) Set data: 01 to page: 0, address: 01.
2) Input the following data to page: D, address: 88 to 8D.
Note: To write in the non-volatile memory (EEPROM), press
the PAUSE button of the adjusting remote commander
each time to set the data.
Address 88 89
Data 00 27
3) Change the data of page: D, address: 72, and set the voltage (A)
between white 50% and the pedestal to the specified value.
4) Press the PAUSE button of the adjusting remote commander.
5) Input the following data to page: D, address: 88 to 8D.
Note: To write in the non-volatile memory (EEPROM), press
the PAUSE button of the adjusting remote commander
each time to set the data.
Address 88 89
Data 38 00
6) Set data: 00 to page: 0, address: 01.
2H
White 50%
Pedestal
Fig. 5-1-14.
8A 8B 8C 8D
00 00 00 00
8A 8B 8C 8D
20 20 02 00
A

5. Backlight Consumption Current Adjustment

(VF-115 Board)

Set the backlight luminance and color temperature.
If deviated, the image may become dark or bright.
Mode
Subject
Measurement point
Measuring instrument
Adjustment page
Adjustment address
Specified value
Note: Adjust 30 seconds after running on the power supply.
Adjusting method:
1) Set data: 01 to page: 0, address: 01.
2) Adjust the power supply voltage so that the voltage of Pin !∞ of
CN9928 (EVF UNREG +) on CB-58 board is 6.00 ± 0.05 Vdc.
3) Change the data of page: D, address: 77, and set the voltage
difference (A) between Pin !∞ of CN9928 (EVF
UNREG +) and Pin !£ of CN9928 (EVF UNREG –) to the
specified value.
4) Press the PAUSE button of the adjusting remote commander.
5) Set data: 00 to page: 0, address: 01.
5–22
Camera
Arbitrary
+ Probe: Pin !∞ of CN9928 (EVF
UNREG +) on CB-58 board
– Probe: Pin !£ of CN9928 (EVF
UNREG –) on CB-58 board
Digital voltmeter
D
77
A = 21.5 ± 1.0 mVdc