Lcd System Adjustment; Vco Adjustment (Pd-188 Board) - Sony DCR-DVD100 Service Manual

COVER COVER
1-5.

LCD SYSTEM ADJUSTMENT

Note1: The back light (fluorescent tube) is driven by a high voltage AC
power supply. Therefore, do not touch the back light holder to
avoid electrical shock.
Note2: When replacing the LCD unit, be careful to prevent damages
caused by static electricity.
Note3: Before performing the adjustments, check the data of page: 0,
address: 10 is "00". If not, set data: 00 to this address.
Note4: NTSC model: DCR-DVD100
PAL model: DCR-DVD100E
Switch setting:
LCD panel ............................................................................. Open
[Adjusting connector]
Most of the measuring points for adjusting the LCD system are
concentrated in CN1003 of the VC-307 board. Connect the
measuring instruments via the multi CPC-8 jig (J-6082-388-A). The
following table shows the Pin No. and signal name of CN1003.
Pin No. Signal Name
1 GND
3 PANEL VG
5 XHD/PSIG
7 EVF VCO
9 D 3.1V
11 MS XIN
13 MS BS
15 MS SCLK
17 C PIO5
19 S TXD
Table 6-1-11.
Remove the CPC lid (bottom).
19
20
Fig. 6-1-17.
Pin No. Signal Name
2 GND
4 H START
6 EVF VG
8 EVF BL
10 LANC SIG
12 MS DIO
14 MS VCC ON
16 ACCESS LED
18 C PIO4
20 S RXD
1
2

1. VCO Adjustment (PD-188 board)

Set the VCO free-run frequency. If deviated, the LCD 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 61
3 B 61
4 B 61
5
6
7
8 B 62
9 0 01
Adjusting method for PAL model:
Order Page Address Data
1 0 01
2 B 62
3 B 62
4 B 62
5
6
7
8 B 61
9 0 01
6-31
DCR-DVD100/DVD100E
MOVIE ( )
Arbitrary
Pin 4 of CN1003 of VC-307 board
(H START)
Frequency counter
B
61, 62
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 .
61
Convert D to decimal notation,
61
and obtain D '. (Note2)
61
Calculate D ' using following
62
equations (Decimal calculation)
When D ' 229
61
D ' = D ' + 26
62 61
When D ' > 229
61
D ' = 255
62
Convert D ' to a hexadecimal
62
number, and obtain D . (Note2)
62
D Set the data, and press PAUSE
62
button.
00 Set the data.
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 .
62
Convert D to decimal notation,
62
and obtain D '. (Note2)
62
Calculate D ' using following
61
equations (Decimal calculation)
When D ' 26
62
D ' = D ' – 26
61 62
When D ' < 26
62
D ' = 0
61
Convert D ' to a hexadecimal
61
number, and obtain D . (Note2)
61
D Set the data, and press PAUSE
61
button.
00 Set the data.