Horizontal Position Adjustment (Coarse); Raster Tilt (Deflection Yoke); Beam Alignment - Hitachi 53SDX20BB Service Manual

2.3 Horiontal Position Adjustment (Coarse)
Adjustment preparation
(1) DCU PHASE DATA SETTING should be
finished.
Adjustment procedure
NORMAL MODE
(1) Receive circle pattern (03ch.)
(2) Push SERVICE ONLY switch to display DCU
crosshatch. Mark the DCU crosshatch center
position using your finger tip.
(3) Push SERVICE ONLY switch again to exit from
the DCU crosshatch.
2
(4) Go to I C ADJ. mode.
(5) Choose H. POSI item by using R/C MENU (or
up/down cursor) key. Adjust horizontal position
to match the circle center to DCU crosshatch
center (marked by your finger tip).
2
(6) Exit from I C menu.
DCU crosshatch
DCU crosshatch center
1080i THROUGH MODE
(1) Receive 1080I (fH=33.75KHz) circle pattern
signal. (Input to component video terminal.)
(2) Select "Aspect 5" on SET-UP, PICTURE
FORMAT of OSD MENU.
(3) Repeat above steps (2)~(6).
2.4 Raster Tilt adjustment (Deflection yoke)
Adjustment preparation
(1) The set can face east or west.
(2) Input the single cross test signal.
(3) Set video conditions to factory preset.
(4) The lens focus
adjustment should have been coarse adjusted.
(5) The electrical focus should have been coarse
adjusted.
(6) The digital convergence RAM should be cleared
(uncorrected state). With the TV set off, press
and hold the service switch located on the
Power/Deflection PWB and then press the
power button.
(7) Start adjustment 20 minutes or more after TV is
turned on.
Adjustment procedure
(1) 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 G deflection yoke and adjust the
vertical raster inclination.
(3) Then, remove the short on the 2P(TS) sub-mini
connectors on the Red and Blue CPT PWB's
and project red or blue light and green light
together on screen.
Circle pattern
Circle center
and horizontal position
(4) Turn the deflection yoke of R or B and set so that the
inclination of R or B light with respect to the green
light is as shown below on the top and bottom sides.
(5) After raster inclination adjustment, fixing screw of DY
should be screwed with 12±2kg-cm torque.
1
2
,
≤±2mm
1 2
Notes: (1) If internal cross-hatch does not appear after
clearing RAM data, press service switch
again, on POWER/DEFLECTION PWB.
(2) To restore old RAM data, turn TV off and on.

2.5 Beam alignment

Adjustment preparation
(1) Adjust at least 30 minutes after turning on power
switch.
(2) Raster tilt should be completed. Raster position,
horizontal and vertical size, and optical focus
adjustment should be coarse adjusted.
(3) Set video conditions to factory preset.
(4) Receive cross-hatch signal.
Adjustment procedure
(1) Green (G) tube beam alignment adjustment.
Short-circuit 2P subminiature connector plug
pins of Red (R) and Blue (B) on the CPT boards
and project only Green (G) light or you may
cover the R and B lens.
(2) Put Green (G) tube beam alignment magnet to
the cancel state as shown below.
(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.)
(5) Turn two magnets forming alignment magnet in
any desired direction and move cross-hatch
center to position found in (3).
(6) If image position does not shift when Green (G)
static focus (Focus Pack) is turned. Green (G)
beam alignment has been completed.
(7) If image position shifts when Green (G) static
focus (Focus Pack) is turned, repeat (2)-(6).
(8) Conduct beam alignment for red (R) and
Blue (B) focus: Focus Pack UFPK.
(9) Upon completion of adjustment, fix beam
alignment magnets with white paint.
24
≤ ±2 mm
CROSSHATCH (GREEN)