Raster Distortion Check (Normal And 1080I Throught Mode) - Hitachi 53SDX20BB Service Manual

(2) Receive 1080i circle pattern of LT-449 (Leader).
2.19 Raster distortion check
Checking condition
(1) Digital convergence adjustment should have been completed.
(2) Receive the cross-hatch signal (internal signal of the the set is acceptable).
(3) Brightness/Contrast --- standard condition
Contrast : max
Other controls : center position
(4) Check the raster distortion specification: Value shown in the table below or less.
A ~ D
---Measure the winding of the outside line.
I ~ L
C
I
5
10
15
20
26
9~10 scales
30
10 20 30 40
15 25 35
30
26
20
15
10
Item
Top/Bottom pincushion distortion
Right/Left pincushion distortion
Center line Vertical line
tilt Horizontal line
Center line Vertical line
winding Horizontal line
Trapezoidal distortion Vertical line
Skew distortion Horizontal line
A
B
G
J
5 scales
5
10
15
20
26
9~10 scales
30
40 30 20 10
35 25 15
30
26
20
15
10
5 scales
(unit: mm)
Symbol 53"
A,B ±6
C,D ±4
5 6
5 6
±3 ±3
±3 ±3
4 5
5 6
D
H
39
43"
±5
±4
5
5
±3
±3
4
5
F
E
K
L