Hitachi C47-WD7000 Service Manual page 40

SERVICE ADJUSTMENTS
(4) In case of G lens.
Set to the point where the chromatic aberration switches from blue to red, If the chromatic aberration
appearing all over the screen is not the same, observe the vertical bright line and adjust lens focus as
specified in table below. When the red chromatic aberration appearing at both sides of the bright line is not
equal, observe the side with larger chromatic aberration when adjusting.
OPTICAL FOCUSING ADJUSTMENT GREEN
ＬＥＮＳ
SCREEN SIZE
(ASPECT RATIO)
L1 and L2
(PITCHES from CENTER
BETWEEN
L1&L2
I
COLOR
ABERRATION
O
(NOTE) * Slightly reddish or no color
** Slightly bluish or no color
Change the signal to the circle pattern and fine adjust.
Observe the corner part of the screen, especially
observe number in the small circle when adjusting.
If the focus performance at the screen center exceeds
the lower limit, it is acceptable.
(NOTE1)
Since the G light is very important for picture quality and performance.
Pay special attention in its adjustment.
Note: Be careful not to touch the lens with your fingers when adjusting.
L1 L2
I
HSA HSA
43" 47"
"
(4:3) (16:9)
3.0
3.0
*
*
(2mmMAX)
**
(2mmMAX)
O
HSB
50" 57"
(4:3) (16:9)
3.0 2.0
Small circle of circle pattern.
40
UNIT
"
INCH
CROSS-HATCH
PITCHES
REFER TO
NOTE BELOW