Sharp 50NP4, Service Manual

Page: 40 / 121

40
(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 chromtic 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
Change the signal to the circle pattern and fine
adjust. Observe the corner part of the screen,
especially observe number in the small circle
shen adjusting. If the focus performance at the
screen center exceeds the lower limit, it is
accpetable.
0 1
L1 L2
CHASSIS SP05 (D78)
SCREEN SIZE 60Ó 50Ó
L1 and L2
(PITCHES from CENTER) 3.0 3.0
BETWEEN
L1&L2 * *
COLOR * *
ABERRATION I 3mm MAX 3mm MAX
** **
O 3mm MAX 3mm MAX
(NOTE) * Slightly reddish or no color
** Slightly bluish or no color
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.
(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 in the same way as the G lens.
OPTICAL FOCUSING ADJUSTMENT RED
(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 chrmoatic 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.
0
1
L
CHASSIS SP05 (D78)
SCREEN SIZE 60Ó 50Ó
L1 and L2
(PITCHES from CENTER) 3.0 3.0
BETWEEN
L1&L2 ** **
COLOR ** **
ABERRATION I 3mm MAX 3mm MAX
* *
O 3mm MAX 3mm MAX
(NOTE) * Slightly reddish or no color
** Slightly bluish or no color
NOTE: Setting the center between Red and crimson is
optimum.
1
O
L
NOTE: Setting the center between purple and crimson is
optimum.