Sony CD Mavica MVC-CD250, Service Manual

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5-39
MVC-CD250/CD400
3. Back Light Adjustment (PK-65/66 Board)
Set the backlight luminance and color temperature.
If deviated, the image may become dark or bright.
Mode PLAY
Signal Arbitrary
Measurement Point Pin
qd
of CN714 on SY-76 board
(BL DC)
Measuring Instrument Digital voltmeter
Adjustment Page A
Adjustment Address 80 (Normal)
81 (Bright)
Specified Value A = 4.00 ± 0.05 V (Normal)
A = 5.45
±
0.05 V (Bright)
Adjusting method:
Order Page Address Data Procedure
1 0 01 01
2 A 02 03 Press PAUSE button.
3 A 80
Change the data and set the
voltage (A) to the normal
specified value.
4 A 80 Press PAUSE button.
5 A 81
Change the data and set the
voltage (A) to the bright
specified value.
6 A 81 Press PAUSE button.
Processing after Completing Adjustments:
Order Page Address Data Procedure
1 A 02 00 Press PAUSE button.
2 0 01 00
4. VCO Adjustment (PK-65/66 Board)
Set the VCO free-run frequency. If deviated, the LCD screen will
be blurred.
Mode PLAY
Signal Arbitrary
Measurement Point Pin
7
of CN714 on SY-76 board
(HSY)
Measuring Instrument Frequency counter
Adjustment Page A
Adjustment Address 82 (NTSC)
83 (PAL)
Specified Value f = 15734 ± 30 Hz (NTSC)
f = 15625
±
30 Hz (PAL)
Menu setting:
1) VIDEO OUT of SET UP setting
......................... NTSC (NTSC mode)
(This adjustment must be performed in NTSC mode, so don’t
set the menu setting to “PAL” )
Adjusting method:
Order Page Address Data Procedure
1 0 01 01
2 A 02 03 Press PAUSE button.
3 4 F1 13
4 A 82
Change the data and set the
frequency (f) to the NTSC
specified value.
5 A 82 Press PAUSE button.
6 4 1D 82
7 A 83
Change the data and set the
frequency (f) to the PAL
specified value.
8 A 83 Press PAUSE button.
Processing after Completing Adjustments:
Order Page Address Data Procedure
1 A 02 01 Press PAUSE button.
2 4 F1 00
3 4 1D 80
4 0 01 00