position where the scarlet chromatic aberration Note: Since the Green light is very important for
slightly appears inside and orange outside. picture quality and performance, pay special
(7) In case of B lens, set to the position where the attention to its adjustment.
chromatic aberration changes from purple to
green. If the chromatic aberration appearing all 2.13 Digital convergence adjustment
over the screen is not the same, observe the Note: If replacing a PRT, DY, etc. perform auto-digital
vertical bright line at the center and set to the
position where green chromatic aberration convergence first. (Press front panel MAGIC
FOCUS switch when in normal customer mode).
slightly appears inside and purple outside. This can eliminate the need for a complete
digital convergence alignment.
Notes: (1) Fixing screw (2) Color aberration
Adjustment preparation
FIXING SCREW COLOR ABERRATION Receive an RF or video signal.
Set controls to factory preset.
Install jig screen on the set.
Note the center of the video pattern displayed.
llYizziL
This is necessary to match dotted lines
LENS (adjustment point viewed) and actual point that
is adjusted and displayed by the video signal.
=Tll!=J
0 Press the service only switch (on
POWER/DEFLECTION PWB). The pattern
CROSS-HATCH displayed is now the digital convergence mode.
(3) Since the Green light is very important for When performing a complete digital
picture quality and performance, pay special
convergence adjustment CLEAR DATA in RAM.
attention to its adjustment. (With the TV set off, press and hold the service
Note: Be careful not to touch the lens with your switch located on the Power/Deftection P.W.B.
fingers when adjusting. and then press the POWER button).
(4) For red, setting to the center between orange
and scarlet is optimum.
(5) For blue, setting to the center between purple
and green is optimum.
(6) All colors should have relatively uniform, good
focus at all areas of screen.
2.12 Static focus adjustment
Adjustment preparation
(1) The raster tilt, raster position, horizontal/
vertical size, lens focus, beam form, and beam
alignment should have been adjusted. Adjustment Point
(2) Set video conditions to factory reset.
(3) Receive the cross-hatch pattern signal.
(4) Apply covers to the lenses of colors other than
the color to be adjusted and project a single JIG SCREEN SPECIFICATION
color.
Adjustment procedure GEOMETRIC CENTER OF THE SCREEN
Red (R), Green (G) and Blue (B) static focus (89.6) E89.61
(1)
adjustment. Vary the static focus VR (focus pack I4
UFPK) and make the center of the cross-hatch
pattern clearest.
(2) Observe the corners of the picture and check
that the focus does not get conspicuously worse.
OBSERVING POINTS OF THE
CORNER OF THE PICTURE
(10781 P
MODEL: (Progressive !node)
[HD mode]
UNIT: mm
OBSERVZPOINTS
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ACEC
HITACHI
