Sony DCR-TRV238E / DCR-TRV239E (serv.man4) Service Manual ▷ View online
— 17 —
DCR-TRV238E/TRV239E
1. VCO Adjustment (PD-156 board)
Set the VCO free-run frequency. If deviated, the LCD screen
will be blurred.
Set the VCO free-run frequency. If deviated, the LCD screen
will be blurred.
[LCD Type Check]
By measuring the resistor value between Pin 6 of CN5502
and GND, the type of LCD can be discriminated.
By measuring the resistor value between Pin 6 of CN5502
and GND, the type of LCD can be discriminated.
Page
5-29
5-32
Before change
After change
: Added portion.
Resistor value
2.2k
Ω
33k
Ω
LCD type
LCD TYPE SH
LCD TYPE SO
PD board
PD-156
PD-160
When the type of LCD is “LCD TYPE SH”, perform”1-5-1.
LCD SYSTEM ADJUSTMENT (LCD TYPE SH)”.
When the type of LCD is “LCD TYPE SO”, perform “1-5-2.
LCD SYSTEM ADJUSTMENT (LCD TYPE SO)”.
LCD SYSTEM ADJUSTMENT (LCD TYPE SH)”.
When the type of LCD is “LCD TYPE SO”, perform “1-5-2.
LCD SYSTEM ADJUSTMENT (LCD TYPE SO)”.
1-5-1.
LCD SYSTEM ADJUSTMENT (LCD TYPE SH)
(PD-156 board)
(PD-156 board)
1. VCO Adjustment (PD-156 board)
Set the VCO free-run frequency. If deviated, the LCD screen
will be blurred.
Set the VCO free-run frequency. If deviated, the LCD screen
will be blurred.
Added contents
1-5-2.
LCD SYSTEM ADJUSTMENT (LCD TYPE SO)
(PD-160 board)
(PD-160 board)
1. VCO Adjustment (PD-160 board)
Set the VCO free-run frequency. If deviated, the LCD screen will
be blurred.
Set the VCO free-run frequency. If deviated, the LCD screen will
be blurred.
Mode
VTR stop
Signal
No signal
Measurement Point
Pin 8 of CN5502 (XHD OUT)
Measuring Instrument
Frequency counter
Adjustment Page
C
Adjustment Address
61, 62
Specified Value
f = 15625 ± 30Hz
Note1: The data of page: 0, address: 10 must be “00”.
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
Set the data.
2
C
61
Change the data and set the VCO
frequency (f) to the specified value.
frequency (f) to the specified value.
3
C
61
Press PAUSE button.
4
C
61
Read the data, and this data is
named D61.
named D61.
5
Convert D61 to decimal notation,
and obtain D61'. (Note2)
and obtain D61'. (Note2)
6
Calculate D62' using following
equations (Decimal calculation)
When D
equations (Decimal calculation)
When D
61
’ 17
D
62
’ = D
61
’– 17
When D
61
’ < 17
D
62
’ = 00
7
Convert D62’ to a hexadecimal
number, and obtain D62. (Note2)
number, and obtain D62. (Note2)
8
C
62
D62
Set the data, and press PAUSE button.
9
0
01
00
Set the data.
Note2: Refer to “Table 5-4-1. Hexadecimal-decimal Conversion Table”.
— 18 —
DCR-TRV238E/TRV239E
(Page 5-32)
2. PSIG Gray Adjustment (PD-160 board)
Set the uniformity improvement signal to an appropriate level.
2. PSIG Gray Adjustment (PD-160 board)
Set the uniformity improvement signal to an appropriate level.
Mode
VTR stop
Signal
No signal
Measurement Point
Pin 4 of CN5502 (PSIG)
Measuring Instrument
Oscilloscope
Adjustment Page
C
Adjustment Address
66
Specified Value
A = 5.00 ± 0.1V
Note:
The data of page: 0, address: 10 must be “00”.
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
Set the data.
2
C
66
Change the data and set the
PSIG signal level (A) to the
specified value.
(The data should be “00” to
“7F”)
PSIG signal level (A) to the
specified value.
(The data should be “00” to
“7F”)
3
C
66
Press PAUSE button.
4
0
01
00
Set the data.
Fig. 5-1-17.
3. RGB AMP Adjustment (PD-160 board)
Set the D range of the RGB decoder used to drive the LCD to the
specified value. If deviated, the LCD screen will become blackish
or saturated (whitish).
Set the D range of the RGB decoder used to drive the LCD to the
specified value. If deviated, the LCD screen will become blackish
or saturated (whitish).
Mode
VTR stop
Signal
No signal
Measurement Point
Pin 3 of CN5502 (VG)
Ext. trigger: Pin 4 of CN5502 (PSIG)
Ext. trigger: Pin 4 of CN5502 (PSIG)
Measuring Instrument
Oscilloscope
Adjustment Page
C
Adjustment Address
64
Specified Value
A = 7.44 ± 0.05V
Note:
The data of page: 0, address: 10 must be “00”.
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
Set the data.
2
C
64
Change the data and set the
voltage (A) between the reversed
waveform pedestal and non-
reversed waveform pedestal to
the specified value.
voltage (A) between the reversed
waveform pedestal and non-
reversed waveform pedestal to
the specified value.
3
C
64
Press PAUSE button.
4
0
01
00
Set the data.
Fig. 5-1-18.
A
2H
Pedestal
Pedestal
A
2H
— 19 —
DCR-TRV238E/TRV239E
4. Black Limit Adjustment (PD-160 board)
Set the dynamic range of the LCD driver to an appropriate level. If
deviated, the LCD screen will become blackish or saturated
(whitish).
Set the dynamic range of the LCD driver to an appropriate level. If
deviated, the LCD screen will become blackish or saturated
(whitish).
Mode
VTR stop
Signal
No signal
Measurement Point
Pin 4 of CN5502 (PSIG)
Measuring Instrument
Oscilloscope
Adjustment Page
C
Adjustment Address
65
Specified Value
A = 8.30 ± 0.08V
Note:
The data of page: 0, address: 10 must be “00”.
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
Set the data.
2
3
C4
61
Set the data.
3
3
C5
50
Set the the data.
4
C
65
Change the data and set the
PSIG signal amplitude (A) to the
specified value.
(The data should be “00” to “0F”.)
PSIG signal amplitude (A) to the
specified value.
(The data should be “00” to “0F”.)
5
C
65
Press PAUSE button.
6
3
C4
00
Set the data.
7
3
C5
00
Set the data.
8
0
01
00
Set the data.
9
Check that the specified value of
“RGB AMP Adjustment” is
satisfied.
“RGB AMP Adjustment” is
satisfied.
Fig. 5-1-19.
5. Contrast Adjustment (PD-160 board)
Set the level of the VIDEO signal for driving the LCD to the specified
value. If deviated, the screen image will be blackish or saturated
(whitish).
Set the level of the VIDEO signal for driving the LCD to the specified
value. If deviated, the screen image will be blackish or saturated
(whitish).
Mode
VTR stop
Signal
No signal
Measurement Point
Pin 3 of CN5502 (VG)
Ext. trigger: Pin 4 of CN5502 (PSIG)
Ext. trigger: Pin 4 of CN5502 (PSIG)
Measuring Instrument
Oscilloscope
Adjustment Page
C
Adjustment Address
69
Specified Value
A = 2.40 ± 0.05V
Note:
The data of page: 0, address: 10 must be “00”.
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
Set the data.
2
C
69
Change the data and set the voltage
(A) between the 100 IRE and 0 IRE
(pedestal) to the specified value.
(The data should be “00” to “7F”.)
(A) between the 100 IRE and 0 IRE
(pedestal) to the specified value.
(The data should be “00” to “7F”.)
3
C
69
Press PAUSE button.
4
0
01
00
Set the data.
Fig. 5-1-20.
(Page 5-32)
A
V
100 IRE
Pedestal
A
2H
— 20 —
DCR-TRV238E/TRV239E
6. Center Level Adjustment (PD-160 board)
Set the video signal center level of LCD panel to an appropriate
level.
Set the video signal center level of LCD panel to an appropriate
level.
Mode
VTR stop
Signal
No signal
Measurement Point
Pin 3 of CN5502 (VG)
Measuring Instrument
Digital voltmeter
Adjustment Page
C
Adjustment Address
6A
Specified Value
A = 7.00 ± 0.03Vdc
Note:
The data of page: 0, address: 10 must be “00”.
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
Set the data.
2
C
6A
Change the data and set the DC
voltage (A) to the specified value.
(The data should be “00” to “7F”.)
voltage (A) to the specified value.
(The data should be “00” to “7F”.)
3
C
6A
Press PAUSE button.
4
0
01
00
Set the data.
(Page 5-32)
7. V-COM Adjustment (PD-160 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
conspicuous vertical lines.
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
conspicuous vertical lines.
Mode
VTR stop
Signal
No signal
Measurement Point
Check on LCD display
Measuring Instrument
Adjustment Page
C
Adjustment Address
63
Specified Value
The brightness difference between the
section A and section B is minimum.
section A and section B is minimum.
Note1: This adjustment should be carried out upon completion of the
following adjustments.
RGB AMP Adjustment
Black Limit Adjustment
Contrast Adjustment
Center Level Adjustment
Black Limit Adjustment
Contrast Adjustment
Center Level Adjustment
Note2: The data of page: 0, address: 10 must be “00”.
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
Set the data.
2
C
63
Change the data so that the
brightness of the section A and
that of the section B is equal.
(The data should be “00” to “3F”.)
brightness of the section A and
that of the section B is equal.
(The data should be “00” to “3F”.)
3
C
63
Subtract 2 from the data.
4
C
63
Press PAUSE button.
5
0
01
00
Set the data.
Fig. 5-1-21.
A
A
A
A
B
B
B
B
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