Hitachi 51F710A/DP55, Service Manual

Page: 60 / 187

5
9
DP
55
BACK TO ADJUSTMENTS
2.200 SIDE PANEL DISTORTION CHECK
Measuring Condition
(1) Measure it after 20 minutes or later of the picture appearance.
(2) Display NTSC circle pattern signal, set Aspect to 4:3 standard mode.
Contrast: Max, Brightness: Center
(3) Measure side panel width as shown below A ~ F.
2.19 TOP & BOTTOM PANEL DISTORTION CHECK
Measuring Condition
(1) Measure it after 20 minutes or later of the picture appearance.
(2) Display NTSC
Circle Pattern
.
Contrast: Max, Brightness: Center
(3) Press [PIP] key on remote controller to select “SPLIT” mode as shown below.
(4) Measure Top & Bottom panel width as shown.
NOTE: If any of the above is not within specification, re-adjust
convergence.
Specification : Top & Bottom distortion ･･･ Value shown in the following table or less.
(Unit : mm)
Pincushion distortion 46” 51” 57” 65” Remarks
G － H
H － I
± 1.5 ± 2.0 ± 2.0 ± 2.5
J
－
K
K
－
L
±
1.5
±
2.0
±
2.0
±
2.5
Trapezoidal distortion 46” 51” 57” 65” Remarks
G － I ± 1.0 ± 2.0 ± 1.5 ± 2.0
J － L ± 1.0 ± 2.0 ± 1.5 ± 2.0
G
I
Circle pattern
H
J
L
Circle pattern
K
SPLIT mode
Specification : Side panel distortion
…
Value shown in the following table or less.
(Unit : mm)
Pincushion distortion 46” 51” 57” 65” Remarks
A
－
B
B
－
C
±
2.0
±
2.5
±
2.5
±
3.0
D － E
E － F
± 2.0 ± 2.5 ± 2.5 ± 3.0
Trapezoidal distortion 46” 51” 57” 65” Remarks
A － C ± 1.5 ± 2.0 ± 2.0 ± 2.5
D
－
F
±
1.5
±
2.0
±
2.0
±
2.5
A
B
C
D
E
F
Circle pattern
4:3 standard mode