Hitachi 42HDT79 - UltraVision CineForm - 42" Plasma TV, Service Manual

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40
DW 2 U
3.12 525i Cb,Cr Clamp offset adjustment
Preparation
(1) Change signal format from 525(480)p to 525(480)i.
Adjustment
(1) Select ‘ RGB ’ 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.
3.
2
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 Sub
Contrast adj.
Measuring Conditions
(1) At the signal electric field strength 75±
dBm, the
specification mentioned above should be satisfied.
(2) At the input electric field 46-106dB , there should be
no abnormality.
* From color bar pattern below.
DW-2
Can be seen at black A 1 *
Can be seen slightly from black A 2 *
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
(
8
)
When PDP turns ON , it will tune CH03 this is the
complete operation
of Memory Initialize process.
·Process of Memory Initialize operation.
A screen is be colored
cyan
when MEMORY INIT
start.
A screen is be colored
green
when MEMORY INIT
finish normally.
A screen is be colored red when MEMORY INIT
finish abnormally.
(6) Do not unplug from AC outlet until this operation
is complete and do not perform any key operation
either, after this operation each factory setting and
all adjust mode data should reset to delivery settings
automatically.
(7) After Memory Initialize, it should be unplug AC cord.
Unplug and plug AC cord and then all settings and data
①
②
③
are updated.
The adjustment item that is affected by the memory
initialize operation is shown below:
Note: Perform pre heat-run for more than 20 min. before
adjusting.
2.2
FACTORY AND SERVICE ADJUSTMENTS
BACK TO ADJUSTMENTS
* JIG. R/C FACTORY PRESET CODE:92
MEMORY INITIALIZE and FACTORY PRESET
ITEM MEMORY
INITIALIZE
FACTORY RESET REMARKS
RGB(480p) ADJUST DATA NOT INITIALIZE NOT INITIALIZE
WHITE BALANCE SETTING
NOT INITIALIZE NOT INITIALIZE
OTHER ADJUSTMENT MODE DATA INITIALIZE NOT INITIALIZE
FACTORY RESET ITEM INITIALIZE INITIALIZE
CHANNEL LIST INITIALIZE INITIALIZE
3.1 Sub-Contrast & Clamp Offset Adjustment
Preparation for adjustment
(1) Pre-heat at least 2 min. before the Final Adjust.
(2) Recall user menu and select ‘Video’
ඎ
‘Picture Mode’
ඎ
(3) Receive following signal into input3 or input4(Comp) input.
Adjustment procedure
3.11 525p Sub-Contrast, Y/Cb/Cr Clamp offset adjustment
(1) Receive following 525(480)p Signal.
‘Day(Dynamic)’
ඎ
‘Reset’.
Format : 525(480)p
V2 V1
Black White
Black
100% White
V1=1Vpp
V2=0.7Vpp
Adjustment signal for 525(480)p format
(2) Go into Service Adj. Menu and select ‘RGB’ .
(
3 )
Press for over 2 seconds and have it perform
automatic adjustment. When it’s completed, ‘Auto
Adjusting’ on the screen will be disappeared.
Format : 525(480)i
V2 V1
Black White
Black
100% White
V1=1Vpp
V2=0.7Vpp
Fig.
2
Adjustment signal for 525(480)i format
( See Fig.2)
BACK TO ADJUSTMENTS