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5-30

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

The data of page: 0, address: 10 must be “00”.

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”)

3

C

66

Press PAUSE button.

4

0

01

00

Set the data.

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)

Measuring Instrument

Oscilloscope

Adjustment Page

C

Adjustment Address

64

Specified Value

A = 7.68 ± 0.05V

The data of page: 0, address: 10 must be “00”.

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.

3

C

64

Press PAUSE button.

4

0

01

00

Set the data.

Fig. 5-1-17.

Fig. 5-1-18.

5-31

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

The data of page: 0, address: 10 must be “00”.

1

0

01

01

Set the data.

2

3

C4

61

Set the data.

3

3

C5

58

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”.)

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.

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)

Measuring Instrument

Oscilloscope

Adjustment Page

C

Adjustment Address

69

Specified Value

A = 2.72 ± 0.05V

The data of page: 0, address: 10 must be “00”.

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”.)

3

C

69

Press PAUSE button.

4

0

01

00

Set the data.

Fig. 5-1-19.

Fig. 5-1-20.

5-32

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

The data of page: 0, address: 10 must be “00”.

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”.)

3

C

6A

Press PAUSE button.

4

0

01

00

Set the data.

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.

This adjustment should be carried out upon completion of the
following adjustments.

RGB AMP Adjustment
Black Limit Adjustment
Contrast Adjustment
Center Level Adjustment

The data of page: 0, address: 10 must be “00”.

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”.)

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

5-33

Correct the white balance.
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

C

Adjustment Address

67, 68

Specified Value

The LCD screen should not be colored.

Check the white balance only when replacing the following parts.
If necessary, adjust them.
1. LCD panel
2. Light induction plate
3. IC5501

The data of page: 0, address: 10 must be “00”.

1

0

01

01

Set the data.

2

C

67

7E

Set the data, and press PAUSE
button.

3

C

68

6C

Set the data, and press PAUSE
button.

4

C

68

Check that the LCD screen is not
colored. If not colored, proceed to
step 10.

5

C

67

Change the data so that the LCD
screen is not colored.

6

C

67

Press PAUSE button.

7

C

68

Change the data so that the LCD
screen is not colored.

8

C

68

Press PAUSE button.

9

C

68

If the LCD screen is colored,
repeat steps 5 to 9.

10

0

01

00

Set the data.