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8-5.
LCD SYSTEM ADJUSTMENT
Note
: You
will
receive an electric shock if you touch
the
back-light
holder. When the back
light
is
not in
use.
remove the back-light drive unit.
Preparations
:
1)
The back-light drive unit is required only for
white
balance
check. V COM
DC
adjustment and
ANTI PAL adjustment. Remove it before every
other
adjustment/
check.
2)
Set the following
VRs as
below, unless otherwise
indicated:
BRIGHT
(RV302)
···
·
· · Mechanical
center
COLOR
(RV902)
· ·· ···
Position in which voltage at Pin
®
of
IC901 on
the
RG-5 board is 1.20
±
0.05V.
3) External sync
······
J701
(VIDEO
IN)
on
the
JK-34
board
4) The following devices are used for LCD system
adjustment
:
Fluorescent
tube
holder
jig
(J-6082-022-A)
COMMON voltage adjusting jig
(J-6082-024-A)
LCD unit and
back
light
Fluorescent tube
holder jigs
Fig.
8-32.
Usage
of the fluorescen
t
tube
holders
[Input
video signal for
adjustment]
Unless
indicated
otherwise input a color bar
signal
into
the
video input
terminal
as the adjustment
video
input
signal.
Approx.
0.7V
Approx.
0.3V
White
(approx.
100
%)
Burst
signal
(To
be flat)
Horizontal
SYNC
signal
Fig.
8-33.
Color
bar
signal
TApprox.
j_
0.3V
- 164
8-5-1.
Oscillation Frequency Adjustment
(
RG-5
Board)
Mode
Power
on
Signal
Non-signal
Measurement Point
Pin
®
of IC901
Adjusting Element
CV901
Specified
Value
4433450 ±
10 Hz
Adjusting method :
1)
Adjust
to
4433450
±
10
Hz
with CV901.
8-5-2.
Contrast Adjustment
(
RG-5
Board)
Mode
Power
on
Signal
Color
bar
Measurement Point
CH
1
:
Pin
@
of CN905
CH2
:
Pin
®
of CN905
Measuring
Instrument
Oscilloscope
(TRIG
: CH2)
Adjusting
Element
RV901
Specified
Value
4.0
±
0.1 Vp-p
Adjusting method
:
1
)
Adjust
voltage
between white
(100
%)
and
pedestal
sections
to
4.0
±
0.1 Vp-p with RV901.
Pedestal
White
(1
00
%
)
I
CH1
f
4.0
±
0.1
Vp-p
l
CH2
Vp-p
2H
.. j
Fig.
8-34.
I
~
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