Sony MVC-FD83 - VCO Adjustment (PAL) (PK-47;48 Board); D Range Adjustment (PK-47;48 Board)

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3. VCO Adjustment (PAL) (PK-47/48 Board)
Set the VCO free-run frequency. If deviated, the LCD screen will
be blurred.
Mode PLAY
Signal Arbitrary
Measurement Point Pin (7) of CN801 (HSY)
Measuring Instrument Frequency counter
Adjustment Page D
Adjustment Address 8D
Specified Value f = 16175 ± 30 Hz (FD83)
f = 15625 ± 30 Hz (FD88)
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
2) Select page: D, address: C3, set data: 05, and press the PAUSE
button of the adjusting remote commander.
3) Select page: 0, address: 01, and set data: 00.
4) Turn the power of unit OFF and then ON.
5) Select page: 0, address: 01, and set data: 01.
6) Select page: 5, address: F0, and set data: 01.
7) Select page: D, address: 8D change the data and set the fre-
quency (f) to the specified value.
8) Press the PAUSE button of the adjusting remote commander.
Processing after Completing Adjustments:
1) Select page: 5, address: F0, and set data: 00.
2) Select page: D, address: C3, set data: 00 (NTSC model) or
data: 04 (PAL model), and press the PAUSE button of the ad-
justing remote commander
3) Select page: 0, address: 01, and set data: 00.
4. D Range Adjustment (PK-47/48 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 PLAY
Signal Stair-step signal of 10 steps (non
burst)
(Test signal)
Measurement Point Pin (9) of CN801 (VG)
Measuring Instrument Oscilloscope
Adjustment Page D
Adjustment Address 85
Specified Value A = 3.20 ± 0.05 Vp-p (FD83)
A = 3.62 ± 0.05 Vp-p (FD88)
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
2) Select page: 2, address: 06, and set data: 01.
3) Select page: 5, address: F1, and set data: 03.
4) Select page: D, address: 85, change the data and set the volt-
age (A) to the specified value.
5) Press the PAUSE button of the adjusting remote commander.
Processing after Completing Adjustments:
1) Select page: 5, address: F1, and set data: 00.
2) Select page: 2, address: 06, and set data: 00.
3) Select page: 0, address: 01, and set data: 00.
A: Pedestal level difference between 1H period and
previous 1H period.
A
0 IRE (Pedestall)
0 IRE (Pedestall)
2H
Fig. 5-1-22