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5-33

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 (IO-64 board S103,104) to the center.

Before perform the LCD system adjustment, check that the
specified value of “Base Band Block Adjustments” of “VIDEO
SYSTEM ADJUSTMENTS” is satisfied.

Most of the measuring points for adjusting the LCD display are
concentrated in the following connector.
CN9925 of the CB-61 board
Connect the Measuring Instruments via the CPC-10 jig (J-6082-
424-A).
The following table shows the Pin No. and signal name of the
connector.

If stated as “10-step stair-step” in the signal column, input the 10-
step stair-step signal in the video input terminal as the video input
signal for the adjusting. Check that the input signal level is 1.00
Vp-p before adjusting.

Fig. 5-3-25.      10 steps star-steps

1

2

3

4

5

VR

VG

VB

V COM

GND

6

7

8

9

C SYNC

HDB

SRT

FRP

Mode

VTR stop

Signal

Arbitrary

Adjustment Page

D

Adjustment Address

60 to 68, 6A to 6F

Adjusting method:
1)

Select page: 0, address:01, and set data: 01.

2)

Select page: D, and input the data in the following table.

 To write in the non-volatile memory (EEPROM), press the

PAUSE button of the adjustment remote commander each time
to set the data.

3)

Select page: 0, address:01, and set data: 00.

60

61

62

63

64

65

66

67

68

6A

6B

6C

6D

6E

6F

NTSC

75

71

71

74

CA

8E

7F

7E

5E

50

50

7E

8E

32

44

PAL

96

76

76

7F

CA

86

7F

7E

6A

50

50

7A

6E

32

22

Hue adjustment

White balance adjustment

White balance adjustment

Contrast adjustment

PANEL –19V adjustment

V-COM adjustment

Fixed value

Fixed value

Horizontal position adjustment

Fixed value

Fixed value

Bright adjustment

Color adjustment

Fixed value

Fixed value

Approx.
0.714V

Approx.
0.286V

H sync

0 IRE

100 IRE

1.00V   

5-34

Mode

VTR stop

Signal

No signal

Measurement Point

Pin 

!ª of CN9928 (CPC VGL –18V)

Measuring Instrument

Digital voltmeter

Adjustment Page

D

Adjustment Address

64

Specified Value

A = –19.0 ± 0.5Vdc

Adjusting method:
1)

Select page: 0, address: 01, and set data: 01.

2)

Select page: D, address: 64, change the data and set the DC
voltage (A) to the specified value.

3)

Press the PAUSE button of the adjustment remote commander.

4)

Select page: 0, address: 01, and set data: 00.

Adjust the position of the image.
If its position is not correct. it will slip to the right or left.

Mode

VTR stop

Signal

Color bar

Measurement Point

CH1: Pin 

9 of CN9925 (FRP)

CH2: Pin 

6 of CN9925 (CSYNC)

Measuring Instrument

Oscilloscope
Trigger source: CH1

Adjustment Page

D

Adjustment Address

68

Specified Value

T = 4.81 ± 0.10 

µ

sec

Adjusting method:
1)

Select page: 0, address: 01, and set data: 01.

2)

Select page: D, address: 68, change the data and set the delay
time (T) to the specified value.

3)

Press the PAUSE button of the adjustment remote commander.

4)

Select page: 0, address: 01, and set data: 00.

Fig. 5-3-26.

CH1

CH2

CH1

CH2

Enlargement

T

2H

5-35

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

10-step stair-step signal or color bar
signal whose chroma and burst signals
are turned off

Measurement Point

Pin 

2 of CN9925 (VG)

Measuring Instrument

Oscilloscope

Adjustment Page

D

Adjustment Address

6C

Specified Value

A = 4.00 ± 0.05V (NTSC)
A = 4.15 ± 0.05V (PAL)

Perform “4. Bright Adjustment” and “5. Contrast Adjustment”
alternately until each specified value is satisfied.

Adjusting method:
1)

Select page: 0, address: 01, and set data: 01.

2)

Select page: D, address: 6C, change the data and set the voltage
(A) between the reversed waveform pedestal and non-reversed
waveform pedestal to the specified value.
 (The data of address: 6C should be “41” to “BF”.)

3)

Press the PAUSE button of the adjustment remote commander.

4)

Select page: 0, address: 01, and set data: 00.

5)

Perform “Contrast Adjustment”.

Fig. 5-3-27.

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

10-step stair-step signal or color bar
signal whose chroma and burst signals
are turned off

Measurement Point

Pin 

2 of CN9925 (VG)

Measuring Instrument

Oscilloscope

Adjustment Page

D

Adjustment Address

63

Specified Value

A = 2.90 ± 0.05V (NTSC)
A = 3.22 ± 0.05V (PAL)

Adjusting method:
1)

Select page: 0, address: 01, and set data: 01.

2)

Select page: D, address: 63, change the data and set the voltage
(A) between the 0 IRE (pedestal) and 90 IRE to the specified
value.

3)

Press the PAUSE button of the adjustment remote commander.

4)

Select page: 0, address: 01, and set data: 00.

5)

Check that the specified value of “Bright Adjustment” is
satisfied, if not perform “Bright Adjustment”.

Fig. 5-3-28.

Pedestal

Pedestal

A

2H

90 IRE

0 IRE

A

2H

5-36

Set the color saturation to the standard value. If deviated, the color
will be to dark or light.

Mode

VTR stop

Signal

Color bar

Measurement Point

Pin 

2 of CN9925 (VG)

Measuring Instrument

Oscilloscope

Adjustment Page

D

Adjustment Address

6D

Specified Value

A = 0.40 ± 0.05V

Adjusting method:
1)

Select page: 0, address: 01, and set data: 01.

2)

Select page: D, address: 63, after noting down the data, add 10
(heximadecimal number) to the data.

3)

Press the PAUSE button of the adjustment remote commander.

4)

Select page: D, address: 6D, change the data and set the voltage
(A) between the white(75%) and green to the specified value.
(The data of address: 6D should be “48” to “B7”.)

5)

Press the PAUSE button of the adjustment remote commander.

6)

Select page: D, address: 63, set the data noted down at step 2),
and press the PAUSE button.

7)

Select page: 0, address: 01, and set data: 00.

Fig. 5-3-29.

Set the hue to the standard value. If deviated, the color will be to
unnatural.

Mode

VTR stop

Signal

Color bar

Measurement Point

Pin 

2 of CN9925 (VG)

Measuring Instrument

Oscilloscope

Adjustment Page

D

Adjustment Address

60

Specified Value

A = 0.15 ± 0.05V

Adjusting method:
1)

Select page: 0, address: 01, and set data: 01.

2)

Select page: D, address: 63, after noting down the data, add 10
(heximadecimal number) to the data.

3)

Press the PAUSE button of the adjustment remote commander.

4)

Select page: D, address: 60, change the data and set the voltage
(A) between the yellow and cyan to the specified value. (The
data of address: 60 should be “48” to “B7”.)

5)

Press the PAUSE button of the adjustment remote commander.

6)

Select page: D, address: 63, set the data noted down at step 2),
and press the PAUSE button.

7)

Select page: 0, address: 01, and set data: 00.

Fig. 5-3-30.

Green

White (75%)

A

2H

Cyan

Yellow

A

2H