Raster Distortion Check - Hitachi 51SWX20B Service Manual

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 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
BACK TO ADJUSTMENTS
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
Symbol 51" 57"
A,B
±6 ±6
C,D
±4 ±4
E 6
F 6
G
±3 ±4
H
±3 ±4
I,J 5
K,L 6
D
J
52
(unit: mm)
65"
±6
±5
6 6
6 6
±4
±4
5 5
6 6
E
H
L
DP27/27D
F
K