Sony DCR-PC4E / DCR-PC5 / DCR-PC5E (serv.man2) Service Manual ▷ View online
5-31
1-5.
LCD SYSTEM ADJUSTMENT
Note 1:
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.
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 damages
caused by static electricity.
caused by static electricity.
[Adjusting connector]
Most of the measuring points for adjusting the LCD system are
concentrated in CN2105 of the PD-126 board. The following table
shows the Pin No. and signal name of CN2105.
concentrated in CN2105 of the PD-126 board. The following table
shows the Pin No. and signal name of CN2105.
1. VCO Adjustment (PD-126 board)
Set the VCO free-run frequency. If deviated, the LCD screen will
be blurred.
be blurred.
Mode
VTR stop
Signal
No signal
Measurement Point
Pin 5 of CN2105 (HSY)
Measuring Instrument
Frequency counter
Adjustment Page
D
Adjustment Address
A2, A3
Specified Value
f = 15734 ± 30Hz (NTSC)
f = 15625 ± 30Hz (PAL)
f = 15625 ± 30Hz (PAL)
Note1:
NTSC: DCR-PC5
PAL: DCR-PC4E/PC5E
PAL: DCR-PC4E/PC5E
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
Set the data.
2
D
A2
Change the data and set the
VCO frequency (f) to the
specified value.
VCO frequency (f) to the
specified value.
3
D
A2
Press PAUSE button.
4
D
A2
Read the data, and this data is
named D
named D
A2
.
5
Convert D
A2
to decimal notation,
and obtain D
A2
'. (Note2)
6
Calculate D
A3
' using following
equations (Decimal calculation)
NTSC model:
When D
NTSC model:
When D
A2
' 221
D
A3
' = D
A2
' + 34
When D
A2
' > 221
D
A3
' = 255
PAL model:
When D
When D
A2
' 34
D
A3
' = D
A2
' – 34
When D
A2
' < 34
D
A3
' = 00
7
Convert D
A3
' to a hexadecimal
number, and obtain D
A3
. (Note2)
8
D
A3
D
A3
Set the data, and press PAUSE
button.
button.
9
0
01
00
Set the data.
Note2:
Refer to “Table 5-4-1. Hexadecimal-decimal Conversion Table”.
Table 5-1-12.
Pin No.
1
2
3
4
5
Signal Name
VG
COM
GND
PSIG
HSY
PD-126 board
CN2105
1
5
Fig. 5-1-17.
5-32
2. Bright Adjustment (PD-126 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).
specified value. If deviated, the LCD screen will become blackish
or saturated (whitish).
Mode
VTR stop
Signal
No signal
Measurement Point
Pin 1 of CN2105 (VG)
Measuring Instrument
Oscilloscope
Adjustment Page
D
Adjustment Address
A5
Specified Value
A = 7.8 ± 0.05V
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
Set the data.
2
D
A5
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
D
A5
Press PAUSE button.
4
0
01
00
Set the data.
5
Perform “Black Limit
Adjustment”.
Adjustment”.
3. Black Limit Adjustment (PD-126 board)
Set the dynamic range of the LCD driver to an appropriate level. If
deviated, the LCD screen will become blackish or saturated
(whitish).
deviated, the LCD screen will become blackish or saturated
(whitish).
Mode
VTR stop
Signal
No signal
Measurement Point
Pin 4 of CN2105 (PSIG)
Measuring Instrument
Oscilloscope
Adjustment Page
D
Adjustment Address
A6
Specified Value
A = 8.60 ± 0.05V
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
Set the data.
2
2
0E
61
Set the data.
3
2
0F
Set the following data.
5B: DCR-PC5 (NTSC)
53: DCR-PC4E/PC5E (PAL)
5B: DCR-PC5 (NTSC)
53: DCR-PC4E/PC5E (PAL)
4
D
A6
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
D
A6
Press PAUSE button.
6
2
0E
00
Set the data.
7
2
0F
00
Set the data.
8
0
01
00
Set the data.
9
Check that the spacified value of
“Bright Adjustment” is satisfied.
If not, perform “Bright
Adjustment”.
“Bright Adjustment” is satisfied.
If not, perform “Bright
Adjustment”.
Pedestal
Pedestal
A
2H
A
V
Fig. 5-1-18.
Fig. 5-1-19.
5-33
4. Contrast Adjustment (PD-126 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).
value. If deviated, the screen image will be blackish or saturated
(whitish).
Mode
VTR stop
Signal
No signal
Measurement Point
Pin 1 of CN2105 (VG)
Measuring Instrument
Oscilloscope
Adjustment Page
D
Adjustment Address
AA
Specified Value
A = 2.95 ± 0.05V
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
Set the data.
2
D
AA
Change the data and set the
voltage (A) between the 3 steps
peak and pedestal to the
specified value.
(The data should be “00” to
“7F”.)
voltage (A) between the 3 steps
peak and pedestal to the
specified value.
(The data should be “00” to
“7F”.)
3
D
AA
Press PAUSE button.
4
0
01
00
Set the data.
5
Check that the specified value of
“Bright Adjustment” is satisfied.
“Bright Adjustment” is satisfied.
5. Center Level Adjustment (PD-126 board)
Set the video signal center level of LCD panel to an appropriate
level.
level.
Mode
VTR stop
Signal
No signal
Measurement Point
Pin 1 of CN2105 (VG)
Measuring Instrument
Digital voltmeter
Adjustment Page
D
Adjustment Address
AB
Specified Value
A = 7.00 ± 0.05Vdc
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
Set the data.
2
3
0C
60
Set the data, and press PAUSE
button.
button.
3
3
22
08
Set the data, and press PAUSE
button.
button.
4
D
AB
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”.)
5
D
AB
Press PAUSE button.
6
3
0C
00
Set the data, and press PAUSE
button.
button.
7
3
22
00
Set the data, and press PAUSE
button.
button.
8
0
01
00
Set the data.
3 steps peak
Pedestal
A
2H
Fig. 5-1-20.
5-34
6. V-COM Adjustment (PD-126 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.
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
D
Adjustment Address
A4
Specified Value
The brightness difference between the
section A and section B is minimum.
section A and section B is minimum.
Note:
Perform “Bright Adjustment”, “Black Limit Adjustment”, “Contrast
Adjustment” and “Center Level Adjustment” before this adjustment.
Adjustment” and “Center Level Adjustment” before this adjustment.
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
Set the data.
2
D
A4
Change the data so that the
brightness of the section A and
that of the section B is equal.
(The data should be “80” to
“BF”.)
brightness of the section A and
that of the section B is equal.
(The data should be “80” to
“BF”.)
3
D
A4
Subtract 3 from the data.
4
D
A4
Press PAUSE button.
5
0
01
00
Set the data.
7. White Balance Adjustment (PD-126 board)
Correct the white balance.
If deviated, the reproduction of the LCD screen may degenerate.
If deviated, the reproduction of the LCD screen may degenerate.
Mode
VTR stop
Signal
No signal
Measurement Point
Check on LCD screen
Measuring Instrument
Adjustment Page
D
Adjustment Address
A8, A9
Specified Value
The LCD screen should not be
colored.
colored.
Note1:
Check the white balance only when replacing the following parts.
If necessary, adjust them.
If necessary, adjust them.
1. LCD panel
2. Light induction plate
3. IC2101
2. Light induction plate
3. IC2101
Note2:
Use the AC power adaptor.
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
Set the data.
2
D
A8
90
Set the data, and press PAUSE
button.
button.
3
D
A9
6F
Set the data, and press PAUSE
button.
button.
4
D
A9
Check that the LCD screen is
not colored. If not colored,
proceed to step 10.
not colored. If not colored,
proceed to step 10.
5
D
A8
Change the data so that the LCD
screen is not colored.
screen is not colored.
6
D
A8
Press PAUSE button.
7
D
A9
Change the data so that the LCD
screen is not colored.
screen is not colored.
8
D
A9
Press PAUSE button.
9
D
A9
If the LCD screen is colored,
repeat steps 5 to 9.
repeat steps 5 to 9.
10
0
01
00
Set the data.
A
A
A
A
B
B
B
B
Fig. 5-1-21.
