Hitachi 32HDT50, Руководство по обслуживанию

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31
PT3-E/G AVC3-U
2.2 FACTORY AND SERVICE ADJUSTMENTS
The adjustment item that is affected by the memory
initialize operation is shown below:
3 AMPLITUDE ADJUSTMENT
(AVC CENTER)
3.1 RGB AMPLITUDE ADJUSTMENT
Preparation
(1) Select “Video” - “Picture Mode” - “Day” - “Reset”. Set
“Reset” of “Video” menu when PC input is selected.
(2) Input 525p(480p) of RGB amplitude adj. signal into
INPUT1(Component) input.
(3) Input VGA(60Hz) RGB amplitude adj. signal into
RGB input.
Note: Perform pre heat-run for more than 30 min. before
adjusting.
Adjustment
(1) Receive 525p(480p) signal (Aspect 16:9 Standard).
(2) Select ‘RGB(480p)’ of Service Adj. menu. Press
right cursor key ( ) over 2 seconds and have it
perform automatic adjustment. When it’s completed,
‘Auto Adjusting’ on the screen will disappear.
(3) Receive PC signal (VGA(60Hz)), (Aspect Full).
(4) Similarly as (2), select ‘RGB(PC)’ of Service Adj.
Menu, by pressing SEL button. Press for 2 sec. to
do automatic adjustment.
3.2 SUB-CONTRAST ADJUSTMENT
Preparation
(1) Receive Sub-contrast adjustment signal (Fig. 1).
Adjustment
(1) Select ‘SUB CONTRAST’ of Service Adj. Menu.
Press for over 2 seconds and have it perform
automatic adjustment. When it’s completed, ‘Auto
Adjusting’ on the screen will be disappeared.
V
1
V
2
Fig. 1
Full White
(RF Input ANT A))
V
1
=1.0 Vp-p (when
V
2
=100IRE)
Procedure 2
(1) Short PRST connector on the AVC AV PWB and
check that the set return to delivery settings (CH 03).
(2) Do not unplug from AC outlet until this operation is
completed and do not perform any key operation
either. After this operation, each factory setting and
adjust mode data should reset to delivery setting
automatically.
3.3 BRIGHTNESS CHECK
Preparation
(1) Start checking 20 minutes or more after the power is
turned ON.
(2) Receive the color bar signal.
(3) The vertical incident illumination on the screen
should be 20 lux or less.
(4) Picture Format is 16:9 standard mode.
(5) Select Day mode and reset.
Checking Procedure
(1) Check the brightness as below.
Note: If set black level is NG, readjust item 3.1 RGB
amp. adj. and 3.2 Sub Contrast adj.
Measuring Conditions
(1) At the signal electric field strength 75± dBu, the
specification mentioned above should be satisfied.
(2) At the input electric field 46-106dBu, there should be
no abnormality.
* From color bar pattern below.
AVC50
Can be seen at black A3*
Can be seen slightly from black A5*
RGB amplitude adj. signal
Black White
0.7V
Recommended Equipment:
ASTRO VG-823 Digital Video Generator
with RB-649 Remote Box.
-Remarks
A7 A6 A5 A4 A3 A2 A1
White 100%
7 step gray scale
A4 has tolerance.
A4 can be between black and
Slightly from black.
Color Bar Signal
10
0
Adj. Items Memory Init. W/B
Init.(No
need to
use) change
of FC-
unit change of
PDP-module
or change of
I002(EEPROM
) on
SIG/AUDIO
PWB change of
I003(EEPR
OM) on
AV PWB
or Memory
Init.
Video white
blance Adj. affect Adj.
PC white
blance Adj. affect Adj.
Video RGB
Amplitude
Adj. Adj.
PC RGB
Amplitude
Adj. Adj.
Sub-contrast
Adj. affect
(M-CONT4;
S-CONT4) Adj.
Initialization Adjustment
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