Vco Adjustment (Vc-307 Board) - Sony DCR-DVD100 Service Manual

DCR-DVD100/DVD100E

1. VCO Adjustment (VC-307 board)

Set the VCO free-run frequency. If deviated, the EVF screen will be
blurred.
Mode
Subject
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Note1: The data of page: 0, address: 10 must be "00".
Note2: Refer to "Table 6-3-1. Hexadecimal-decimal Conversion Table".
Adjusting method for NTSC model:
Order Page Address Data
1 0 01
2 B 51
3 B 51
4 B 51
5
6
7
8 B 52 D
9 0 01
MOVIE ( )
Arbitrary
Pin 7 of CN1003 (EVF VCO)
Frequency counter
B
51, 52
f = 15734 ± 30Hz (NTSC)
f = 15625 ± 30Hz (PAL)
Procedure
01 Set the data.
Change the data and set the VCO
frequency (f) to the specified
value.
Press PAUSE button.
Read the data, and this data is
named D .
51
Convert D to decimal notation,
51
and obtain D '. (Note2)
51
Calculate D ' using following
52
equations (Decimal calculation)
When D ' 231
51
D ' = D ' + 24
52 51
When D ' > 231
51
D ' = 255
52
Convert D ' to a hexadecimal
52
number, and obtain D . (Note2)
52
Set the data, and press PAUSE
52
button.
00 Set the data.
Adjusting method for PAL model:
Order Page Address Data
1 0 01
2 B 52
3 B 52
4 B 52
5
6
7
8 B 51
9 0 01
6-28
Procedure
01 Set the data.
Change the data and set the VCO
frequency (f) to the specified
value.
Press PAUSE button.
Read the data, and this data is
named D .
52
Convert D to decimal notation,
52
and obtain D '. (Note2)
52
Calculate D ' using following
51
equations (Decimal calculation)
When D ' 24
52
D ' = D '– 24
51 52
When D ' < 24
52
D ' = 0
51
Convert D ' to a hexadecimal
51
number, and obtain D . (Note2)
51
D Set the data, and press PAUSE
51
button.
00 Set the data.