2.9 Beam form adjustmentAdjustment procedure
(1) Loosen the fixing screw or wing nut on the lens
Adjustment preparation
(1) The beam alignment should have beencylinder so that the lens cylinder can be turned.
(Be careful not to loosen too much). After
completed.
completing steps (4), (5), (6) below, tighten the
(2) The raster tilt, centering, horizontal/
fixing screws or wing nuts for each lens with a
vertical size should have been completed.
(3) Set video conditions to factory preset.torque of 1.18N.m (12Kgf cm) ~ 1.67N.m (17Kgf
cm).
(4) Input the dot signal.
(Be careful the lens cylinder does not turn after
Adjustment procedurehaving tightened the screw or wing nuts. If it is
(1) Green PRT beam shape adjustment. Short-tightened too much, lens may tilt or screw may
circuit 2P sub-mini connectors on Red and Bluebreak.)
CPT P.W.B.s to project only the Green beam.
Lens AssyLens Assy
(2) Turn the green static focus VR, on the Focus
Pack, fully clockwise. (Blooming)
(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(NOTE 1)(NOTE 2)
R, G and B static VRs to the just focus point.Fixing ScrewFixing Wing Nut
(6) After the beam form is completed, fix the beam
form magnet with white paint.(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 R,
PRT SURFACE SIDE
G and B is only an example.)
(3) If the lens adjustment knob is turned clockwise
viewed from the front, the color Aberration
4-POLE BEAM
change as follows.
SHAPE CORRECTIONTYPE 1TYPE 2
MAGNET
ZERO FIELD2-POLE BEAM
SPACER (NOALIGNMENT
ADJUSTMENT)MAGNET
TRUE CIRCLE SPECIFICATION
Cross-HatchColor
Aberration
bChange of Color Aberration
Short focusLong focus
RED LENSOrangeScarlet
TRUE CIRCLE DEGREE: a/bGREEN LENSBlueRed
aSPECIFICATION: 0.9-1.1
BLUE LENSPurpleGreen
2.10 LENS FOCUS ADJUSTMENT
(4) In case of G lens. Set to the point where the
Adjustment preparationchromatic aberration switches from blue to red.
(1) The orientation of PTV set is arbitrary, west,If the chromatic aberration appearing all over
east, north and south.the screen is not the same, observe the vertical
(2) Centering DY inclination should have beenbright line and adjust lens focus as specified in
adjusted.table below. When the red chromatic aberration
(3) Electrical focus adjustment should have beenappearing at both sides of the bright line is not
completed.equal, observe the side with larger chromatic
(4) Drive VR location adjustment should have beenaberration when adjusting.
completed. (Red : 12 OOclock, Green : 1~2
OOclock).L1L2
(5) Receive the cross-hatch pattern signal.
(6) Refer to setup below.
CONTRAST : HALF of full scale.
BRIGHTNESS : minimum
IO
42 |
ACEC
HITACHI
