Hitachi C43-FD2000, Руководство по обслуживанию

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(5) Contrast control should be set Center and
Brightness control should be set minimum.
Adjustment procedure
(1) Loosen the fixing screw or wing nut on
the lens cylinder so that the lens
cylinder can be turned. (Be careful not
to loosen too much)
After completing steps (4), (5), (6)
below, tighten the fixing screws or
wing nuts for each lens with a torque
of 1.67N.m(7Kgf cm) ~ 1.18N.m(12Kgf
cm).
(Do not turn the lens cylinder after
having a screw and wing nuts
tightened.
Also do not tighten the screw too
much, otherwise the lens will be tilted
too muchor the screw will be broken).
(2) Apply covers to each colors of R, G
and B lenses. and project a single
color beam on the screen and adjust
in sequence.
(The adjustment order of R, G and B
is only an example.)
Lens sass
NOTE1
Fixing
screw
TYPE 1
Lens sass
NOTE2
Fixing
wing
nuts
TYPE 2
(3)
If the lens adjustment knob is turned
clockwise viewed from the front, the
color aberration changes as follows.
Cross-Hatch Color aberration
Change of color aberration
Short focus Long focus
RED LENS Orange Scarlet
GREEN
LENS
Blue Red
BLUE LENS Purple Green
(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.
L1 L2
I O
OPTICAL FOCUSING ADJUSTMENT GREEN
LENS HSA SCB UNIT
SCREEN SIZE 43” 50” INCH
L1 and L2 PITCHES from
CENTER 3.0 (3.0) CROSS-
HATCH
PITCHES
BETWEEN
L1&L2 * *
COLOR
ABERRATION I *
(2mmMAX)
*
(2mmMAX)
REFER
TO
0
**
(2mmMAX)
**
(2mmMAX)
NOTE
BELOW
(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