Comb Filter Operation Check; Scanning Area Check - Hitachi 60DX10B Service Manual

1.2 Comb filter operation check

Adjustment preparation
(1) Receive the color bar signal at the regular tuning
point.
(2) Set the CONTRAST control to MAX and the
other controls to center.
(3) Set the PERFECT PICTURE to OFF.
Adjustment procedure
(1) Check that between the color bars there are line
dots every second color bar as shown in the
drawing.
A
Check A and
B
LINE
A
B
A A
B
line dots.
DOT
X
X
Item
Top/Bottom pincushion distortion
Right/Left pincushion distortion
Center line
tilt
Center line
winding
Trapezoidal distortion
Skew distortion
A
C
B
G
I

1.3 Scanning Area Check

Checking Condition
(1) Digital convergence adjustment should have been
completed.
(2) Receive the circle pattern signal.
(3) Brightness/Contrast - Standard condition
Contrast: Max
Other Controls: Center position
(4) Check that the scanning area matches with the next
drawing.
1.3 Raster Distortion Check
Checking Condition
(1) Digital convergence adjustment should have been
completed.
(2) Receive the cross-hatch signal.
(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
I~L
Symbol 43Ó
A,B ±5
C,D ±4
Vertical line E 5
Horizontal line F 5
Vertical line G ±3
Horizontal line H ±3
Vertical line I,J 4
Horizontal line K,L 5
D
J
25
- Measure the winding of the outside line.
(unit: mm)
50Ó 60Ó
±6 ±6
±4 ±5
6 6
6 6
±3 ±4
±3 ±4
5 5
6 6
F
E
K
H
L