Factory And Service Adjustments; Video Adjustment; Sub-Contrast & Clamp Adjustment - Hitachi P50H401 Service Manual

·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
are updated.
(8) When PDP turns ON , it will tune CH03 this is the
complete operation of Memory Initialize process.

2.2 FACTORY AND SERVICE ADJUSTMENTS

The adjustment item that is affected by the memory
initialize operation is shown below:
MEMORY
ITEM
INITIALIZE
NOT
WHITE BALANCE
INITIALIZED
ADJUSTMENT
DATA
SUB CONTRAST NOT
ADJUSTMENT INITIALIZED
DATA
CLAMP OFFSET NOT
ADJUSTMENT INITIALIZED
DATA
INITIALIZED
OTHER
ADJUSTMENT MODE
DATA
INITIALIZED

3 VIDEO ADJUSTMENT

Note: Perform pre heat-run for more than 20 min. before
adjusting.
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' 'Picture Mode'
'Day(Dynamic)' 'Reset'.
(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.
Black
Black White
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.
BACK TO ADJUSTMENTS
BECKHAM
MMC
PROTECTION FACTORY
SOFTWARE
SOFTWARE
DATA RESET
UPGRADE
UPGRADE
INITIALIZED
NOT NOT
INITIALIZED
INITIALIZED
INITIALIZED
NOT NOT
INITIALIZED
INITIALIZED
INITIALIZED INITIALIZED
NOT NOT
INITIALIZED INITIALIZED
INITIALIZED INITIALIZED
NOT
NOT NOT INITIALIZED
INITIALIZED
INITIALIZED INITIALIZED
NOT
NOT INITIALIZED
INITIALIZED
INITIALIZED
INITIALIZED
100% White
V2 V1 V1=1Vpp
V2=0.7Vpp
Format : 525(480)p
3.12 525i Cb,Cr Clamp offset adjustment
Preparation
(1) Change signal format from 525(480)p to 525(480)i.
(See Fig.2)
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.
Black
Black White
Fig.2 Adjustment signal for 525(480)i format
44
DW3U
100% White
V2 V1 V1=1Vpp
V2=0.7Vpp
Format : 525(480)i