Hitachi C43-FD5000 Service Manual page 22

SERVICE ADJUSTMENTS
Lens sass
TYPE 1
(2) Apply covers to colors of R, G and B lenses so as to project a single color beam on the screen and adjust in
sequence. (The adjustment order of R, G and B is only an example.)
(3) If the lens adjustment knob is turned clockwise (viewed from the front), the color aberration changes as
follows:
RED LENS
GREEN LENS
BLUE LENS
(4) In the 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.
Ｌ Ｌ Ｌ Ｌ
SCREEN SIZE
L1 and L2
(PITCHES from CENTER)
BETWEEN
L1&L2
COLOR
I
ABERRATION
O
NOTE : * Slightly reddish or no color.
** Slightly bluish or no color.
Change the signal to the circular pattern and fine-adjust. Observe
the corners of the screen, especially the numbers 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. Be
careful not to touch the lens with your fingers when adjusting.
(NOTE 1)
Fixing screws
Change of color aberration
Short focus Long focus
Orange Scarlet
Blue Red
Purple Green
HSA SCB
43" 50"
3.0 3.0
* *
* *
(2mmMAX) (2mmMAX)
** **
(2mmMAX) (2mmMAX)
Lens sass
Cross-Hatch
UNIT
INCH
CROSS-HATCH
PITCHES
REFER TO
NOTE BELOW
22
(NOTE 2)
Fixing Wing nuts
TYPE 2
Color aberration
L1 L2
I
Small circle of circle pattern
O