Zenith R50W46 Service Manual - Adjustment Instructions
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5) V-SIZE : Vertical SIZE Adjustment
Adjust until fifth Vertical BAR from upper and lower
center of the screen is accord with the last point of the
frame.
6) UP VLI : Upper Vertical Linearity Adjustment
Adjust the vertical interval of screen upper.
7) LO VLI : Lower Vertical Linearity Adjustment
Adjust the vertical interval of screen lower.
8) PIN PH : Horizontal Trapezoid Fixation
Adjust the horizontal width of screen upper and lower is
to be same.
9) PIN AM : Horizontal PARABOLA Correction
Adjust the vertical line of most angle lattice of right/ left
of screen to be balance with vertical line of center of
screen.
10) V LIN : Vertical Linearity Adjustment
Adjust the vertical size of the screen to be same with
upper and lower.
11) S CORR : S Correction
Adjust the each lattice width Top/Center/Bottom of
screen to be identical.
12) UP CPI : Upper Pincushion Correction
Adjust the pincushion of upper of screen
13) LO CPI : Lower Pincushion Correction
Adjust the pincushion of lower of screen
14) After adjustment complete, exit the RASTER
adjustment mode using ENTER key and exit the SVC
adjustment mode using INSTART key.
7. Lens Focus and Electric Focus
Adjustment
7-1. Preliminary steps
(1) Electric focus,Raster slope & Raster position must be pre-
adjusted.
(2) Heat-run over 45 minutes.
(3) Tune the TV set to receive Cross Hatch
(4) Adjustment must be operated in a dark room(simple dark
room) and pay attention not to touch the lens during
adjustment.
(5) Make any one color raster using lens cover.
(6) Rotating lens right from the front side chromatic aberration
occurs beside Cross-hatch line changes as follows;.
7-2. Green Lens Adjustment
(1) Turn the lens until the chromatic aberration changed Blue
to Red point.
(2) Observing all screen, if the tendency of chromatic
aberration is non-linear, adjust to appear Red chromatic
aberration in 3.5 Cross-Hatch section at center screen.
At this time, in case that the difference of bright line of Red
chromatic aberration is not equal at both sides, adjust to
have more Red chromatic aberration.
(3) Switching the signal to 13CH and operate adjustment
minutely.
(4) Adjust Green focus control volume of focus pack so that
the external big circle's part appeared cleary.
(5) Adjust accurately by repeat the upper control.
(6) Especially, noting to the Green light because it influenced
on picture's function.
7-3. Red Lens Adjustment
(1) Turn the lens until the chromatic aberration changed
orange to scarlet.
(2) Adjust the chromatic aberration so it is centered correctly.
(3) Use the same method for the Red focus as was used for
the Green focus.
ADJUSTMENT INSTRUCTIONS
CHROMATIC
ABERRATION
CROSS HATCH
SIGNAL
Lens
Red
Green
Blue
Change of chromatic aberration
Orange
$ Scarlet
Blue
$ Red
Purple
$ Green
Fig. 3
Fifth Vertical BAR