Sony DCR-TRV738E Service Manual page 96

DCR-TRV738E/TRV740/TRV740E/TRV840
1-4. ELECTRONIC VIEWFINDER SYSTEM
ADJUSTMENT
Note1: When replacing the LCD unit, be careful to prevent damages
caused by static electricity.
Note2: Before performing the adjustments, check the data of page: 0,
address: 10 is "00". If not, set data: 00 to this address.
Note3: Switch setting:
LCD panel ........................................................................... Close
Note4: NTSC model: DCR-TRV740/TRV840
PAL model: DCR-TRV738E/TRV740E
[Adjusting connector]
Most of the measuring points for adjusting the viewfinder system
are concentrated in CN1108 of VC-278 board.
Connect the Measuring Instruments via the CPC-13 jig (J-6082-
443-A).
The following table shows the Pin No. and signal name of CN1108.
Pin No. Signal Name
1 REG GND
2 N. C.
3 BPF MONI
4 N. C.
5 PB RF
6 REG GND
7 N. C.
8 RF SWP
9 N. C.
10 N. C.
Table 5-1-13.
CN1108
1
20
Remove the
CPC lid
Pin No. Signal Name
11 VCO
12 EVF VG
13 RF SWP
14 N. C.
15 CAP FG
16 RF MON
17 N. C.
18 REG GND
19 REG GND
20 REG GND
Fig. 5-1-13.
1. VCO Adjustment (VC-278 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".
Adjusting method:
Order Page Address Data
1 0 01
2 C 51
3 C 51
4 C 51
5
6
7
8 C 52
9 0 01
Note2: Refer to "Table 5-4-1. Hexadecimal-decimal Conversion Table".
5-30
Camera
Arbitrary
Pin qa of CN1108 (VCO)
Frequency counter
C
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 '. (Note1)
51
Calculate D ' using following
52
equations (Decimal calculation)
[NTSC model]
When D ' 236
51
D ' = D '+19
52 51
When D ' > 236
51
D ' = 255
52
[PAL model]
When D ' 19
51
D ' = D '–19
52 51
When D ' < 19
51
D ' = 00
52
Convert D ' to a hexadecimal
52
number, and obtain D . (Note)
52
D Set the data, and press PAUSE
52
button.
00 Set the data.