Hitachi 50HDT50, Service Manual

Page: 32 / 126

32
PT3-H AVC3-U
4 WHITE BALANCE ADJUSTMENTS
(PDP MONITOR)
General Notes for White Balance
(1) If the incident illumination is more than 20 lux,
change the environment (location, lighting, etc.) and
ensure it to be less than 20 lux.
(2) At least one of the color drive codes must stay at its
maximum value, FF
H
.
4.1 VIDEO COLOR TEMPERATURE ADJUSTMENT
(HIGH)
Preparation 1
(1) Set the output of signal generator to white raster.
(Ratio:100%)
(2) Component signal
Video level: 0.714Vp-p
SYNC: 0.286Vp-p
Set-up level: 0V
(3) Input white raster signal into COMPONENT input
terminal of AVC.
(4) Set user control to Day mode. (Picture Mode)
(5) Confirm that the mode is set as “Factory Setting
Mode”.
(6) Aspect: Video: Expanded
PC: FULL
Preparation 2
(1) Set service adjustment menu to “DEVICE ADJUST
MODE”.
(2) Set WBC to “0”. (“PDP” to “WBC”)
Adjustment
(1) Perform the following adjustment with the remote
control.
(2) Set the CRT color analyzer (CA-100) at the center of
the panel.
(3) Set color temperature to “HIGH”.
(4) Ensure that Adjustment R/G/B DRIVE (HIGH) are all
set as FF.
(5) After receiving White raster signal, step down the two
(or one) among Adjustment R/G/B DRIVE (HIGH)
and adjust the value shown in the following:
At least one of the data should be FF.
Specification
Video Color temperature (HIGH)
x = 0.285
±
0.005
y = 0.298
±
0.005
( Color temp : 9200K )
Remarks
(1) Color temperature should be adjusted under the
condition in which the screen is the brightest, thus
the initial value for adjustment is set to its maximum.
(2) Adjustment is made by reducing brightness only.
Reduce a bright color for adjustment.
(3) Video color temperature & Adjustment No. are the
same, but addresses in the memory are different,
thus there’s no problem.
4.2 VIDEO COLOR TEMPERATURE ADJUSTMENT
(MEDIUM)
Preparation
(1) Same as “Video Color Temperature adjustment:
(HIGH)”.
Adjustment
(1) Perform the following adjustment with the remote
control.
(2) Set the CRT color analyzer (CA-100) at the center of
the panel.
(3) Set color temperature to “MEDIUM”, using SEL key.
(4) Ensure that Adjustment R/G/B DRIVE (MEDIUM) are
all set as FF.
(5) After receiving White raster signal, step down the two
(or one) among Adjustment R/B/G DRIVE (MEDIUM)
and adjust the value shown below.
At least one of the data should be FF.
Remarks
(1) Same as “Video Color Temperature adjustment
(HIGH)”
Specification
Video Color temperature (MED)
x = 0.301
±
0.005
y = 0.314
±
0.005
( Color temp : 7500K )
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