Compaq P1220 Wartungshandbuch PDF herunterladen (Seite 107)

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2.5.1.8 Picture distortion

When the picture distortion is measured, each distortion of the preset timing must be less than

the following values.

4-corner section distortion

Inspect the distortion at the four corners.

¥ Signal, H character with frame (both normal/reverse)

Item

<Picture performance inspection items> Inspect the following items for the picture distortion.

No.

Judgement reference value

Input signal

x 1pitch

(=0.3mm)

H character

with frame

(both normal/

reverse)

Left/right

distortion

Top/bottom

distortion

x 0.6mm

* Note

y 1.0mm

Crosshatch

pattern

a. x 1.0mm

b. x 1.5mm

( * )

50mm

H line

Per 50mm

Scale

Within

n mm

V line

Set scale to V line

Enlarged

Inner distortion

Vertical line X

measurement method

¥ Distortion x of S-character

distortion, etc.:

Distortion excluding normal pin,

barrel or trapezoid.

Note:There must be no sea-

gull distortion.

¥ Distortion y:

High frequency distortion

excluding trapezoid.

4-edge distortion

When S-character or seagull type high frequency distortion

is visible, check with the following method.

¥ Distortion x:

a. Center line

b. Curve of other vertical line

¥ Distortion x:Curve within

50mm range

¥ Distortion x:

a. Center line

b. Curve of other vertical

line

¥ Distortion x:

Distortion in the range of one H

character height.

Judge with the white display G.

(Judge the distortion amount with

a fluorescent material stripe.)

(*) Present No. 1

(31.5kHz, 60Hz) is:

a. x 1.5mm

b. x 2.0mm

When Fh < 61kHz,

total area : less than 0.9mm.

When Fh 61kHz,

center : less than 0.6mm,

peripheral : less than 0.9mm.

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