Vco Adjustment (Fc-85 Board); D Range Adjustment (Fc-85 Board) - Sony MVC-FD97 Service Manual

2. VCO Adjustment (FC-85 Board)

Set the VCO free-run frequency. If deviated, the LCD screen will
be blurred.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Specified Value
Specified Value
Menu setting:
1) VIDEO OUT of SET UP menu................ 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
1 0 01 01
2 5 F0 01
3 D D7
4 D D7
4 D DD
5 D DD
Processing after Completing Adjustment:
Order Page Address Data
1 5 F0 00
2 0 01 00
PLAY
Arbitrary
Pin 7 of CN803 (HSY)
Frequency counter
D
D7 (NTSC)
DD (PAL)
TYPE S:
f = 15734 ± 30 Hz (NTSC)
f = 15745 ± 30 Hz (PAL)
TYPE C:
f = 15734 ± 30 Hz (NTSC)
f = 15945 ± 30 Hz (PAL)
Procedure
Change the data and set the
frequency (f) to the NTSC specified
value.
Press PAUSE button.
Change the data and set the
frequency (f) to the PAL specified
value.
Press PAUSE button.
Procedure

3. D Range Adjustment (FC-85 Board)

Set the D range of the LCD driver to the specified value.
If deviated, the LCD screen will became blackish or saturated
(whitish)
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Adjusting method:
Order Page Address Data
1 0 01
2 5 F1
3 D D5
4 D D5
Processing after Completing Adjustment:
Order Page Address Data
1 5 F1
2 0 01
A
Pedestal
A: Pedestal level difference between 1H period and
previous 1H period.
5-44
PLAY
Arbitrary
Pin 9 of CN803 (VG)
External trigger: Pin 8 of CN803
(COM)
Oscilloscope
D
D5
A = 3.62 ± 0.05 Vp-p (TYPE S)
A = 2.50 ± 0.05 Vp-p (TYPE C)
Procedure
01
03
Change the data and set the
voltage (A) to the specified value.
Press PAUSE button.
Procedure
00
00
Pedestal
2H
Fig. 5-1-29