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5-24

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.

When replacing the LCD unit, be careful to prevent damages
caused by static electricity.

Set the LCD BRIGHT (Menu display) to the center.
Set the LCD COLOR (Menu display) to the center.

Connect the adjustment remote commander to CN713 of VC-272
board via I/F unit for LANC control (J-6082-521-A) and CPC jig
connector (J-6082-539-A). To operate the adjustment remote
commander, connect the AC power adapter (8.4Vdc) to the DC
IN jack of I/F unit for LANC control, or connect the L series Info-
LITHIUM battery to the battery terminal of I/F unit for LANC
control.

Most of the measuring points for adjusting the LCD system are
concentrated in 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 CN5502.

Table 5-1-8.

By measuring the resistor value between Pin 6 of CN5502 and
GND, the type of LCD can be discriminated.

Table 5-1-9.

1

3

5

7

9

VB

VG

VR

C-SYNC/XHD

GND

2

4

6

8

10

XVD OUT

PANEL COM

PANEL ID

XHD OUT

GND

1.0 k

Ω

4.7 k

Ω

2.5 LCD TYPE S (61k)

3.0 LCD TYPE S (123k)

TRV107/TRV108/
TRV308/TRV408

TRV608

10

9

1

2

CN5502

5-25

2. VCO Adjustment (PD-156 board)
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

7

Adjustment Address

43

Specified Value

f = 15734 ± 30Hz

1

0

01

01

Set the data.

2

7

43

Change the data and set the VCO
frequency (f) to the specified value.

3

7

43

Press PAUSE button.

4

0

01

00

Set the data.

3. RGB AMP Adjustment (PD-156 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).

Mode

VTR stop

Signal

No signal

Measurement Point

Pin 3 of CN5502 (VG)
External trigger: Pin 4 of CN5502
(PANEL COM)

Measuring Instrument

Oscilloscope

Adjustment Page

7

Adjustment Address

46

Specified Value

A = 3.62 ± 0.05V

1

0

01

01

Set the data.

2

7

46

Change the data and set the
voltage (A) between the reversed
waveform pedestal and non-
reversed waveform pedestal to the
specified value.
(The data should be “00” to “3F”.)

3

7

46

Press PAUSE button.

4

0

01

00

Set the data.

Fig. 5-1-16.

5-26

4. Contrast Adjustment (PD-156 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).

Mode

VTR stop

Signal

No signal

Measurement Point

Pin 3 of CN5502 (VG)
External trigger: Pin 4 of CN5502
(PANEL COM)

Measuring Instrument

Oscilloscope

Adjustment Page

7

Adjustment Address

4B

Specified Value

2.5 LCD: A = 3.52 ± 0.07V
3.0 LCD: A = 3.32 ± 0.07V

Note: 2.5 LCD model : CCD-TRV107/TRV108/TRV308/TRV408

3.0 LCD model : CCD-TRV608

1

0

01

01

Set the data.

2

7

4B

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

7

4B

Press PAUSE button.

4

0

01

00

Set the data.

5. COM AMP Adjustment (PD-156 board)
Set the common electrode drive signal level of LCD to the specified
value.

Mode

VTR stop

Signal

No signal

Measurement Point

Pin 4 of CN5502 (PANEL COM)

Measuring Instrument

Oscilloscope

Adjustment Page

7

Adjustment Address

48

Specified Value

2.5 LCD: A = 6.30 ± 0.05V
3.0 LCD: A = 6.05 ± 0.05V

Note: 2.5 LCD model : CCD-TRV107/TRV108/TRV308/TRV408

3.0 LCD model : CCD-TRV608

1

0

01

01

Set the data.

2

7

48

Change the data and set the
PANEL COM signal level (A) to
the specified value.

3

7

48

Press PAUSE button.

4

0

01

00

Set the data.

Fig. 5-1-17.

Fig. 5-1-18.

5-27

6. V-COM Adjustment (PD-156 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.

Mode

VTR stop

Signal

No signal

Measurement Point

Check on LCD display

Measuring Instrument

Adjustment Page

7

Adjustment Address

45

Specified Value

The brightness difference between the
section A and section B is minimum.

Note: This adjustment should be carried out upon completion of the

following adjustments.

RGB AMP Adjustment
Contrast Adjustment
COM AMP Adjustment

1

0

01

01

Set the data.

2

7

45

Change the data so that the
brightness of the section A and
that of the section B is equal.

3

7

45

Subtract 8 from the data.

4

7

45

Press PAUSE button.

5

0

01

00

Set the data.

7. White Balance Adjustment (PD-156 board)
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

7

Adjustment Address

49, 4A

Specified Value

The LCD screen should not be colored.

Note: Check the white balance only when replacing the following parts. If

necessary, adjust them.

1. LCD panel
2. Light induction plate
3. IC5501

1

0

01

01

Set the data.

2

7

49

60

Set the data, and press PAUSE
button.

3

7

4A

65

Set the data, and press PAUSE
button.

4

7

49

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

5

7

49

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

6

7

49

Press PAUSE button.

7

7

4A

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

8

7

4A

Press PAUSE button.

9

7

4A

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

10

0

01

00

Set the data.

Fig. 5-1-19.

A

A

A

A

B

B

B

B