Lcd System Adjustment; Vco Adjustment (Pd-166 Board) - Sony DCR-IP45 Service Manual

DCR-IP45/IP45E/IP55/IP55E
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.
Switch setting:
LCD BACK LIGHT .......................................................... ON
[Adjusting connector]
Most of the measuring points for adjusting the LCD system are
concentrated in CN803 of the PD-166 board. Connect the Measuring
Instruments via the CPC-jig for LCD panel (J-6082-529-A).
The following table shows the Pin No. and signal name of CN803.
Pin No. Signal Name
1 VG
2 COM
3 GND
4 HSY
5 NC
6 PSIG
Table 5-1-15.
PD-166 board
CN803
6 1
Fig. 5-1-19.

1. VCO Adjustment (PD-166 Board)

Set the VCO free-run frequency. If deviated, the LCD screen will
be unsable.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Note1: NTSC: DCR-IP45/IP55
PAL: DCR-IP45E/IP55E
Note2: Refer to "Table 5-4-1. Hexadecimal-decimal Conversion Table".
Note3: The data of page: 0, address: 10 must be "00".
Adjusting method for NTSC model:
Order Page Address Data
1 0 01
2 C 85
3 C 85
4 C 85
5
6
7
8 C 8F
9 0 01
Adjusting method for PAL model:
Order Page Address Data
1 0 01
2 C 8F
3 C 8F
4 C 8F
5
6
7
8 C 85
9 0 01
5-40
VTR stop
No signal
Pin 4 of CN803 (HSY)
Frequency counter
C
85, 8F
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 .
85
Convert D to decimal notation,
85
and obtain D '. (Note2)
85
Calculate D ' using following
8F
equations (Decimal calculation)
When D ' 238
85
D '= D '+17
8F 85
When D '> 238
85
D '= 255
8F
Convert D ' to a hexadecimal
8F
number, and obtain D . (Note2)
8F
D Set the data, and press PAUSE
8F
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 .
8F
Convert D to decimal notation,
8F
and obtain D '. (Note2)
8F
Calculate D ' using following
85
equations (Decimal calculation)
When D ' 17
8F
D '= D '–17
85 8F
When D '< 17
8F
D '= 00
85
Convert D ' to a hexadecimal
85
number, and obtain D . (Note2)
85
D Set the data, and press PAUSE
85
button.
00 Set the data.