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7-9.
V COM DC Adjustment (RG-24 board)
Measurement
point
Measuring
instrument
Adjustment
element
Specified
value
POWER ON
Color bar which the chroma signal and the
burst signal are turned off
LCD screen
Oscilloscope
V COM DC VR on the LCD unit
The amplitude of the flicker waveform is
the minimum.
Note:
Perform the [V COM
DC adjustment]
with assem-
bling the LCD block.
Take care that the external light should not enter into
the light receiving
part of the COMMON
voltage
adjustment jig.
[Adjustment Method]
1)
2)
3)
4)
Expose the light receiving part of the COMMON
voltage
adjustment jig to the LCD screen. (Point down the LCD
screen not to receive the external light.)
Connect
the oscilloscope
with the COMMON
voltage
adjustment jig.
Turn V COM DC VR and check that the flicker wavefor-
m as shown in the fig.7-7 is output.
(When the flicker waveform
is not output, check
the
exposing
method
of the light receiving
part and the
external
light condition,
and check
with
turning
the
BRIGHT control.)
Minimize the flicker waveform amplitude with
V COM
DC VR.
Note:
Turn V COM
DC VR slowly because it takes long
time to respond to LCD.
The minimum
point of the flicker waveform ampli-
tude is nearly coincided
with the maximum point of the
contrast.
COMMON voltage adjustment
jig
(J-6082-024-A)
Veom
DC Volume
Osci | loscope
GND
LCD unit
Direct current
stabilized power source
Flicker measuring part
Note:
Point down the LCD screen not to
receive the external | ight.
Fig. 7-7
Minimize the amplitude.
|-— v—+
Fig. 7-8
7-10. Character Position Adjustment
(RG-24 board)
Mode
POWER ON
Signal
Color bar
a
Measurement
point
;
LCD screen
Measuring
instrument
Adjustment
element
CV201
Specified
value
[Adjustment Method]
1)
Turn on the data screen by DATA
SCREEN
button.
2)
Adjust
CV201
so that the distance
/ between right edge
of LCD
screen and right edge of data is 101mm
Data display position
LCD display
f=10£!mm
Fig. 7-9
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