Hitachi 51F710 Service Manual page 10

OPTICAL FOCUSING ADJUSTMENT GREEN
CHASSIS
SCREEN SIZE 51"
L1 and L2
(PITCHES from CENTER) 1.0
BETWEEN
L1&L2
COLOR
ABERRATION I 2.0mm MAX 3.0mm MAX
**
O 2.0mm MAX 3.0mm MAX
(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.
Small circle of circle pattern
NOTES: 1. Since the G light is very important for
picture quality and performance, pay
special attention in its adjustment.
2. Be careful not to touch the lens with your
fingers when adjusting.
BACK TO ADJUSTMENTS
DP45
57" 65"
1.0 3.0
* * *
* * *
3.5mm MAX
* *
3.5mm MAX
(5) In case of R lens. Set the position where the
chromatic aberration changes from red to
crimson. As shown below, observe the vertical
bright line and adjust lens focus where the
crimson or red chromatic aberration slightly
appears inside, and crimson or red outside
(reference value : 1~3mm) at the point specified
in table below. Change the signal and fine-
adjust the same way as the G lens.
NOTE: Setting the center between Red and crimson
is optimum.
OPTICAL FOCUSING ADJUSTMENT RED
CHASSIS
SCREEN SIZE
L1 and L2
(PITCHES from CENTER)
BETWEEN
L1&L2
COLOR
ABERRATION I
O
(NOTE) * Slightly reddish or no color
** Slightly crimson or no color
(6) In case of B lens. Set the position where the
chromatic aberration changes from purple to
green. As shown below, observe the vertical
bright line and adjust lens focus where the
purple or green chromatic aberration slightly
appears inside and purple or green outside
(reference value : 1~3mm) at the point specified
in table below. Change the signal and fine-
adjust in the same way as the G lens.
L
I
NOTE: Setting to the center between purple and
crimson is optimum.
10
L
O
I
DP45
51" 57" 65"
3.0 3.0 3.0
* * *
* * *
2.0mm MAX 3.0mm MAX 3.5mm MAX
** * *
2.0mm MAX 3.0mm MAX 3.5mm MAX
O
DP45