NEC MultiSync FE001SB, Service Manual

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6.2.2 Quality zone
The screen is divided into following 3 zones.
Zone A: Inside of the central rectangle of horizontal 360mm by 270mm on the screen.
Zone B: The area between outside the rectangle and the edge of the phosphor screen.
Zone C: The area outside the edge of the phosphor screen.
zone A
V
H
Fluorescent surface edge
zone B
zone C
6.2.3 Acceptance Criteria for K Coating Blemishes
a. Scratch (Glass and coating)
Width (mm) Specification Length (Zone A + Zone B)
0.16 ~ Rejected
0.11 ~ 0.15 Maximum length 13mm
0.06 ~ 0.10 Maximum length 26mm
~ 0.05 Unlimited
Note 1: Even though width of scratch is more than 0.16mm, regard scratch whose contrast is weak
extremely as stain and apply standard of 6.2.3 a.
Note 2: Do not recognize flaws which injures goods prices though it is not especially stipulated as for
zone C.
b. Opaque flaws ( ex. Stain ) and coating peeling
Do not apply the following standard to zone C.
Classify flaws by contrast and judge it by size every the contrast.
Definition of contrast
High contrast : The foreign substance which shuts off light from fluorescence surface.
Middle contrast : A semitransparent foreign substance and stain.
( ex. coating material which has been changed )
Low contrast : Stain and dust which do not reflect light from fluorescence surface and can be
distinguished by its appearance.
Note : Ignore the light spot with no interference color.
(However, Non of them with its size in excess of 3.75 mm is acceptable, that damages
the product quality.)