39
DP27/27D
(Be careful the lens cylinder does not turn after
having tightened the screw or wing nuts. If it is
tightened too much, lens may tilt or screw may
break.)
(2) Apply covers to each color of R, G and B lenses.
And project a single color on the screen and
adjust in sequence. (The adjustment order of G,
R and B is only an example.)
(3) If the lens adjustment knob is turned clockwise
viewed from the front, the color Aberration
change as follows.
(NOTE 1)
Fixing Screw
(NOTE 2)
Fixing Wing Nut
TYPE 1
TYPE 2
Lens Assy
Lens Assy
Color
Aberration
Cross-Hatch
Change of Color Aberration
Short focus
Long focus
RED LENS
Orange
Scarlet
GREEN LENS
Blue
Red
BLUE LENS
Purple
Green
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 1.18N.m (12Kgf cm) ~ 1.67N.m (17Kgf
cm).
O
I
L1
L2
(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.
2.10 LENS FOCUS ADJUSTMENT
Adjustment preparation
(1) The orientation of PTV set is arbitrary, west,
east, north and south.
(2) Centering DY inclination should have been
adjusted.
(3) Static focus adjustment should have been
coarse adjusted.
(4) Drive VR location adjustment should have been
completed. (Red : 12 O’clock, Green : 1~2
O’clock).
(5) Receive the cross-hatch pattern signal.
(6) Refer to setup below.
CONTRAST : HALF of full scale.
BRIGHTNESS : minimum
PRT SURFACE SIDE
4-POLE BEAM
SHAPE CORRECTION
MAGNET
2-POLE BEAM
ALIGNMENT
MAGNET
ZERO FIELD
SPACER (NO
ADJUSTMENT)
(3) Make the dot at the screen center a true circle
using the 4-pole magnet as shown below.
(4) Also adjust the Red and Blue PRT beam shapes
according to the steps (1) to (3).
(5) After the adjustment has been completed,
return R, G and B static VRs to the just focus
point.
(6) After the BEAM FORM is completed, fix the
TRUE CIRCLE SPECIFICATION
TRUE CIRCLE DEGREE: a/b
SPECIFICATION: 0.9-1.1
b
a
2.9 Beam form adjustment
Adjustment preparation
(1) The beam alignment should have been
completed.
(2) The raster tilt, centering, horizontal/
vertical size, scanning area check, and raster
distortion should have been completed.
(3) Set video conditions to factory preset.
(4) Input the dot signal.
(5) Set Aspect to 4:3 Standard Mode.
Adjustment procedure
(1) Green PRT beam shape adjustment. Short-
circuit 2P (TS) sub-mini connectors on Red and
Blue CPT P.W.B.s to project only the Green
beam.
(2) Turn the green static focus VR, on the Focus
Pack, fully clockwise. (Blooming)
BACK TO ADJUSTMENTS
Summary of Contents for 51SWX20B
Page 55: ...55 DP27 27D SIGNAL BLOCK ASSEMBLY BACK TO ADJUSTMENTS ...
Page 56: ...56 DP27 27D DEFLECTION P W B BACK TO ADJUSTMENTS ...
Page 57: ...57 DP27 27D POWER SUPPLY P W B BACK TO ADJUSTMENTS ...
Page 58: ...58 DP27 27D CPT P W B BACK TO ADJUSTMENTS ...
Page 59: ...59 DP27 27D CONTROL P W B BACK TO ADJUSTMENTS ...
Page 60: ...60 DP27 27D TROUBLE SHOOTING FLOWCHART 1 NO RASTER AND NO POWER How to check LED s Diagnosis ...
Page 61: ...61 DP27 27D TROUBLE SHOOTING FLOWCHART ...
Page 62: ...62 DP27 27D TROUBLE SHOOTING FLOWCHART ...
Page 83: ...83 DP27 27D DP2X Protection Circuit Block Diagram Deflection Power Supply ...
Page 84: ...84 DP27 27D DP1X Protection Circuit Block Diagram Signal Power Supply ...
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