Raster Position Adjustment - Hitachi C43-FD5000 Service Manual

SERVICE ADJUSTMENTS
(3) Turn the static focus VR*
screen.
Note : Halo state
(4) Turn the static focus VR*
(5) Turn 2 sheets of the alignment magnet in either direction and move the cross-hatch center to the position
where is checked in step (3).
(6) Turn the static focus VR*
(7) Repeat steps (2) to (6) until the picture position does not move during step (6)
(8) In the same manner, adjust the Red ( VR )*
(9) Fix the beam alignment magnet with white paint after the alignment is completed.
1
VR*
2
VR* Static Focus VR is on focus pack UFPK
3
VR*
2.5

RASTER POSITION ADJUSTMENT

Preparation for adjustment
(1) Place the set facing east or west.
(2) Receive the NTSC Hitachi circle pattern signal. (Set the NTSC mode)
(3) Contrast control should be set Maximum and the other controls should be set Center.
(4) The raster inclination and beam alignment should be adjusted.
The lens focus and electric focus adjustment should be coarsely adjusted.
(5) The convergence should be uncorrected state.
(6) Turn the Main power SW off.
(7) Press and hold the "SERVICE ONLY" SW. on CONV./FOCUS P.W.B. and switch on the Main power.
(8) Press "SERVICE ONLY" SW again to display the DCU's cross-hatch pattern.
Adjustment procedure
(1) Turn the centering magnets for R, G and B to get the center point of the cross-hatch position
within specification as shown below.
G
[Horizontal direction]
4:3
43"
50"
1
for Green fully counterclockwise and check the cross-hatch center position on the
1
for Green fully clockwise.
1
for Green and check if the picture position moves or not.
2
R
Geometric center of the screen
Ｌ
1
Unit： mm
R: Ｌ
L L
1
1 2
B: Ｌ
20 30
2
G: To geometric center of screen.
20 30
3
and the Blue (VR)* tube alignments.
B
Ｌ
2
to the left from the geometric center of the screen,L
to the right from the geometric center of the screen,L
16
±2mm
1
±2mm
2