2.12 Beam alignment 2.13 Beam shape adjustment
Adjustment preparation Adjustment preparation
(I) Adjust at least 30 minutes after turning on power (1) The beam alignment should have been
switch. completed.
(2) Raster inclination, centering, horizontal and (2) The raster inclination, centering, horizontal/
vertical amplitudes and optical focus adjustment vertical amplitude and optical focus adjustments
should be completed. should have been completed.
(3) Set video condjtions to factory reset. (3) Set video conditions to factory reset.
(4) Receive cross-hatch signals. (Use of internal (4) input the dot signal.
cross-hatch signals allowed.)
Adjustment procedure
(5) Short-circuit all metal parts (metal fittings,
centering magnet) installed on the projection (1) Green PRT beam shape adjustment. Short-
circuit 2P sub-mini connectors on Red and Blue
tubes to GND?s of the projection tubes. CPT PW.B.s to project only the Green beam.
Since metal Darts are charaed with electricitv,
(2) Turn the green static focus fully clockwise.
shocks mav be caused if thev are not short (Blooming.)
circuited.
(3) Make the dot at the screen center a true circle
using the 4-pole magnet as shown below.
Adjustment procedure
(1) Green (G) tube beam alignment adjustment. (4) Also adjust the Red and Blue PRT beam shapes
according to the steps (1) to (3).
Short-circuit 2P subminiature connector plug
pins of Red (R) and Blue (B) on the CPT boards (5) After the adjustment has been completed, return
R, G and B static VRs to the just focus point.
and project only Green (G) tube.
(2) Put Green (G) tube beam alignment magnet to PRT SURFACE SIDE
the cancel state as shown below.
MAGNET
\ Z-POLE BEAM
ALIGNMENT
MAGNET
TRUE CIRCLE SPECIFICATION
(3) Turn the Green (G) static focus (Focus Pack)
counterclockwise all the way and make sure of
position of cross-hatch center on screen. (Halo
state.)
(4) Turn the Green (G) static focus (Focus Pack)
clockwise all the way. (Blooming state.) TRUE CIRCLE DEGREE: a41
(5) Turn two magnets forming alignment magnet in SPECIFICATION: 0.9-1.1
any desired direction and move cross-hatch
center to position found in (3). 2.14 Static focus adjustment
(6) If image position does not shift when Green (G) Adjustment preparation
static focus (Focus Pack) is turned. Green (G)
beam alignment has been completed. (1) The raster inclination, centering, horizontal/
vertical amplitude and optical/electrical focus
(7) If image position shifts when Green (G) static
focus (Focus Pack) is turned, repeat (2)-(6). beam alignment should have been adjusted.
(2) The static convergence data shoutd be cleared.
(8) Conduct beam alignment for red (R) focus:
Focus Pack UFPK, Blue (B) focus: Focus Pack (3) Set video conditions to factory reset.
(4) Receive the cross-hatch pattern signal.
UFPK.
(9) Upon completion of adjustment, fix beam (5) Apply covers to the lenses of colors other than
the color to be adjusted and project a single
alignment magnets with white paint.
color.
Adjustment procedure
(1) Red (R), Green (E) and Blue (B) static focus
adjustment. Vary the static focus VR (focus pack
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.
24 |
ACEC
HITACHI
