Sony HDV HVR-A1U, Service Manual

Page: 218 / 437

6-59
HVR-A1J/A1U/A1N/A1E/A1P/A1C
1. VCO Adjustment (NN-001 board)
Set the VCO free-run frequency. If deviated, the EVF screen will
be blurred.
Mode CAMERA
Subject Not required
Measurement Point Pin
4
of CN7005 (EVF_VCO) on
NN-001 board
Measuring Instrument Frequency counter
Adjustment Page C
Adjustment Address 34, 35
Specified Value f = 15734
±
30 Hz (NTSC)
f = 15625
±
30 Hz (PAL)
Note 1: Check that the data of page: 0, address: 10 is “00”.
Note 2: Refer to Table 6-4-1. “Hexadecimal-decimal conversion
table”
Note 3: If D
35
’ > 255, then D
35
= FF (NTSC model)
If D
34
’ < 0, then D
34
= 00 (PAL model)
Adjusting method for NTSC model:
Order Page Address Data Procedure
1 0 01 01
2 C 34
Change the data and set the
frequency (f) to the specified
value.
3 C 34 Press PAUSE (Write) button.
4 C 34
Read the data and this data is
named D
34
.
5
Convert D
34
to decimal
notation, and obtain D
34
’.
(Note 2)
6
Calculate D
35
’ using
following equations.
(decimal calculation)
D
35
’ = D
34
’ + 21
7
Convert D
35
’ to a hexadeci-
mal number, and obtain D
35
.
(Note 2, 3)
8 C 35 D
35
Press PAUSE (Write) button.
9 0 01 00
Adjusting method for PAL model:
Order Page Address Data Procedure
1 0 01 01
2 C 35
Change the data and set the
frequency (f) to the specified
value.
3 C 35 Press PAUSE (Write) button.
4 C 35
Read the data and this data is
named D
35
.
5
Convert D
35
to decimal
notation, and obtain D
35
’.
(Note 2)
6
Calculate D
34
’ using
following equations.
(decimal calculation)
D
34
’ = D
35
’ – 21
7
Convert D
34
’ to a hexadeci-
mal number, and obtain D
34
.
(Note 2, 3)
8 C 34 D
34
Press PAUSE (Write) button.
9 0 01 00