Lcd System Adjustments; Vco Adjustment (Pd-156 Board) - Sony DCR-TRV140 Service Manual

DCR-TRV140/TRV140E/TRV140M
1-5.

LCD SYSTEM ADJUSTMENTS

Note 1: The back light (fluorescent tube) is driven by a high volt-
age AC power supply. Therefore, do not touch the back
light holder to avoid electrical shock.
Note 2: When replacing the LCD unit, be careful to prevent dam-
ages caused by static electricity.
Note 3: Set the LCD BRIGHT (Menu setting) to the center.
Set the LCD B.L. (Menu setting) to the BRT NORMAL.
Set the LCD COLOR (Menu setting) to the center.
[Adjusting connector]
Most of the measuring points for adjusting the LCD display are
concentrated in the following connector.
CN5502 of the PD-156 board
Connect the Measuring Instruments via the multi CPC jig (J-6082-
311-A).
The following table shows the Pin No. and signal name of the
connector.
Pin No. Signal Name
1 VB
3 VG
5 VR
7 C-SYNC/XHD
9 GND
[LCD type check]
By measuring the resistor value between Pin 6 of CN5502 and
Pin q; of CN5502, the type of LCD can be discriminated.
PD-156 board CN5502
Resistor
LCD type
value
1 kΩ TYPE S
1.5 kΩ TYPE C
PD-156 board
CN5502
Pin No. Signal Name
2 XVD OUT
4 PANEL COM
6 PANEL_ID
8 XHD OUT
10 GND
Volt ohm meter
+
Multi CPC jig
(J-6082-311-A)
6 pin
0 pin
Fig. 5-1-16

1. VCO Adjustment (PD-156 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
Note 1: NTSC model: DCR-TRV140/TRV140M
PAL model: DCR-TRV140E
Adjusting method
Order Page Address Data
1 0
2 D
3 D
4 D
5
6
7
8 D
9 0
Note 2: Refer to table 5-4-1. "Hexadecimal-decimal conver-
sion table"
Note 3: If D
A3
If D
A3
—
5-26
CAMERA
Arbitrary
Pin 8 of CN5502 (XHD OUT)
Frequency counter
D
A2, A3
f=15734 ± 30 Hz (NTSC model)
f=15625 ± 30 Hz (PAL model)
Procedure
01 01
Change the data and set the
A2 frequency (f) to the specified
value.
A2 Press PAUSE button.
Read the data and this data is
A2
named D .
A2
Convert D
A2
notation, and obtain D
(Note 2)
Calculate D
following equations.
(decimal calculation)
D ' = D ' + 23 (NTSC
A3 A2
model)
D ' = D ' – 20 (PAL model)
A3 A2
Convert D
A3
mal number, and obtain D
(Note 2, 3)
A3 D Press PAUSE button.
A3
01 00
' > 255, then D = FF (NTSC model)
A3
' < 0, then D = 00 (PAL model)
A3
to decimal
'.
A2
' using
A3
' to a hexadeci-
.
A3