Mitsubishi Diamond Pro 750SB Service Manual page 70

6.2.2 Division of zone
The screen is divided into following 3 zones.
Zone A: Area inside the rectangle that its size measures the followings in the center of screen.
H : 300mm, V : 225mm
Zone B: Area outside zone A and inside the fluorescent surface edge.
Zone C: Area outside the fluorescent surface edge.
H
6.2.3 Limits
a. Scratch
Width (mm)
0.16 ~
0.11 ~ 0.15
0.06 ~ 0.10
~ 0.05
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 :
Middle contrast : A semitransparent foreign substance and stain.
Low contrast :
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.)
zone A
V
Allowable Length(mm)(Zone A + Zone B)
The foreign substance which shuts off light from fluorescence surface.
( ex. coating material which has been changed )
Stain and dust which do not reflect light from fluorescence surface and can be
distinguished by its appearance.
Fluorescent surface edge
zone B
zone C
Reject
13
26
Unlimited
5-27