Raster Position Adjustment - Hitachi C47-WD7000 Service Manual

SERVICE ADJUSTMENTS

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) Press and hold the "SERVICE ONLY" SW. on POWER/DEF P.W.B. and switch on the Main power.
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.
[Horizontal direction]
4:3 model
43"
50"
R: Ｌ to the left from the geometric center of the screen.
1
Ｌ1 ±2mm
B: Ｌ to the right from the geometric center of the screen.
2
Ｌ2 ±2mm
G: To geometric center of screen.
Tolerance:±2mm
[Vertical direction]
G,R and B should be the same position as the geometric center of the screen should be within±2mm.
(2) Immediately after the adjustment is completed, fix the R, G and B centering magnets using white paint.
R
G
Ｌ
1
Unit：mm
Ｌ Ｌ
1 2
20 30 47"
20 30 57"
B
Geometric center of the screen
Ｌ
2
16:9 model
Ｌ Ｌ
1 2
20 35
20 35
32
Ｌ Ｌ
1 2