Sony DCR-TRV250 (serv.man4) Service Manual ▷ View online
DCR-TRV250
6-35
COVER
COVER
1-5.
LCD SYSTEM ADJUSTMENTS
Before perform the LCD system adjustments, check that the data
of page: 0, address: 10 is “00”.
If not, select page: 0, address: 10, and set the data “00”.
of page: 0, address: 10 is “00”.
If not, select page: 0, address: 10, and set the data “00”.
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.
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.
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.
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-180 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.
concentrated in the following connector.
CN5502 of the PD-180 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.
[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.
Pin q; of CN5502, the type of LCD can be discriminated.
PD-180 board CN5502
Resistor
value
2.2 k
Ω
3.3 k
Ω
LCD type
TYPE S
TYPE C
Pin No.
1
3
5
7
9
Signal Name
VB
VG
VR
C-SYNC/XHD
GND
Pin No.
2
4
6
8
10
Signal Name
XVD OUT
PANEL COM
PANEL_ID
XHD OUT
GND
Fig. 6-1-18
Multi CPC jig
(J-6082-311-A)
(J-6082-311-A)
PD-180 board
CN5502
6
pin
0
pin
Volt ohm meter
+
—
1. VCO Adjustment (PD-180 board)
Set the VCO free-run frequency. If deviated, the LCD screen will
be blurred.
be blurred.
Mode
CAMERA
Subject
Arbitrary
Measurement Point
Pin 8 of CN5502 (XHD OUT)
Measuring Instrument
Frequency counter
Adjustment Page
C
Adjustment Address
47, 48
Specified Value
f=15734
± 30 Hz
Note 1:
Check that the data of page: 0, address: 10 is “00”.
Adjusting method
Order Page Address Data
Procedure
1
0
01
01
2
C
47
Change the data and set the
frequency (f) to the specified
value.
frequency (f) to the specified
value.
3
C
47
Press PAUSE button.
4
C
47
Read the data and this data is
named D
named D
47
.
5
Convert D
47
to decimal
notation, and obtain D
47
’.
(Note 2)
6
Calculate D
48
’ using
following equations.
(decimal calculation)
D
(decimal calculation)
D
48
’ = D
47
’ + 18
7
Convert D
48
’ to a hexadeci-
mal number, and obtain D
48
.
(Note 2, 3)
8
C
48
D
48
Press PAUSE button.
9
0
01
00
Note 2:
Refer to table 6-4-1. “Hexadecimal-decimal conver-
sion table”
sion table”
Note 3:
If D
48
’ > 255, then D
48
= FF
DCR-TRV250
6-36
3. Contrast Adjustment (PD-180 board)
Set the level of the VIDEO signal for driving the LCD to the speci-
fied value. If deviated, the screen image will be blackish or satu-
rated (whitish).
fied value. If deviated, the screen image will be blackish or satu-
rated (whitish).
Mode
CAMERA
Subject
Arbitrary
Measurement Point
Pin 3 of CN5502 (VG)
External trigger : Pin 4 of CN5502
(PANEL COM)
External trigger : Pin 4 of CN5502
(PANEL COM)
Measuring Instrument
Oscilloscope
Adjustment Page
C
Adjustment Address
4F
Specified Value
A=3.30
± 0.05 Vp-p (TYPE S model)
A=2.75
± 0.05 Vp-p (TYPE C model)
Note:
Check that the data of page: 0, address: 10 is “00”.
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
2
C
4F
Change the data and set the
voltage (A) to the specified
value. (The data of address:
4F, should be “00” to “7F”)
voltage (A) to the specified
value. (The data of address:
4F, should be “00” to “7F”)
3
C
4F
Press PAUSE button.
4
0
01
00
2. RGB AMP Adjustment (PD-180 board)
Set the D range of the RGB driver used to drive the LCD to the
specified value. If deviated, the LCD screen will become blackish
or saturated (whitish).
specified value. If deviated, the LCD screen will become blackish
or saturated (whitish).
Mode
CAMERA
Subject
Arbitrary
Measurement Point
Pin 3 of CN5502 (VG)
External trigger : Pin 4 of CN5502
(PANEL COM)
External trigger : Pin 4 of CN5502
(PANEL COM)
Measuring Instrument
Oscilloscope
Adjustment Page
C
Adjustment Address
4A
Specified Value
A=3.50
± 0.05 Vp-p (TYPE S model)
A=2.92
± 0.05 Vp-p (TYPE C model)
Note:
Check that the data of page: 0, address: 10 is “00”.
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
2
C
4A
Change the data and set the
voltage (A) to the specified
value. (The data of address:
4A, should be “00” to “3F”)
voltage (A) to the specified
value. (The data of address:
4A, should be “00” to “3F”)
3
C
4A
Press PAUSE button
4
0
01
00
A: Between the pedestal (0 IRE) and 100 IRE
Fig. 6-1-20
A
2H
100 IRE
Pedestal
A: Between the reversed waveform pedestal and
non-reversed waveform pedestal
Fig. 6-1-19
A
2H
Pedestal
Pedestal
DCR-TRV250
6-37
5. V-COM Adjustment (PD-180 board)
Set the DC bias of the common electrode drive signal of LCD to
the specified value.
If deviated, the LCD display will move, producing flicker and con-
spicuous vertical lines.
the specified value.
If deviated, the LCD display will move, producing flicker and con-
spicuous vertical lines.
Mode
CAMERA
Subject
Arbitrary
Measurement Point
Check on LCD display
Measuring Instrument
Adjustment Page
C
Adjustment Address
49
Note 1:
Check that the data of page: 0, address: 10 is “00”.
Note 2:
Perform “RGB AMP Adjustment”, ”Contrast
Adjsutment” and “COM AMP Adjustment” before this
Adjsutment.
Adjsutment” and “COM AMP Adjustment” before this
Adjsutment.
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
2
C
49
Change the data so that
brightness of the section A
and section B is equal.
brightness of the section A
and section B is equal.
3
C
49
Subtract 8 from the data.
4
C
49
Press PAUSE button.
5
0
01
00
4. COM AMP Adjustment (PD-180 board)
Set the common electrode drive signal level of LCD to the speci-
fied value.
fied value.
Mode
CAMERA
Subject
Arbitrary
Measurement Point
Pin 4 of CN5502 (PANEL COM)
Measuring Instrument
Oscilloscope
Adjustment Page
C
Adjustment Address
4C
Specified Value
A=6.40
± 0.05 Vp-p (TYPE S model)
A=5.58
± 0.05 Vp-p (TYPE C model)
Note:
Check that the data of page: 0, address: 10 is “00”.
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
2
C
4C
Change the data and set the
voltage (A) to the specified
value.
voltage (A) to the specified
value.
3
C
4C
Press PAUSE button.
4
0
01
00
A
A
A
A
B
B
B
B
Fig. 6-1-22
A: PANEL COM signal level
Fig. 6-1-21
A
2H
DCR-TRV250
6-38
6. White Balance Adjustment (PD-180 board)
Correct the white balance.
If deviated, the LCD screen color cannot be reproduced.
If deviated, the LCD screen color cannot be reproduced.
Mode
CAMERA
Subject
Arbitrary
Measurement Point
Check on LCD display
Measuring Instrument
Adjustment Page
C
Adjustment Address
4D, 4E
Specified Value
The LCD screen should not be
colored.
colored.
Note 1:
Check that the data of page: 0, address: 10 is “00”.
Note 2:
Check the white balance only when replacing the fol-
lowing parts. If necessary, adjust them.
lowing parts. If necessary, adjust them.
1. LCD panel
2. Light induction plate
3. IC5501
2. Light induction plate
3. IC5501
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
2
C
4D
87
Press PAUSE button.
3
C
4E
68
Press PAUSE button.
4
Check that the LCD screen is
not colored. If not colored,
proceed to step 6.
not colored. If not colored,
proceed to step 6.
5
C
4D
Change the data so that the
4E
LCD screen is not colored.
(Note 3)
(Note 3)
6
0
01
00
Note 3:
To write in the non-volatile memory (EEPROM), press
the PAUSE button each time to set the data.
the PAUSE button each time to set the data.
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