NEC MultiSync FP1350 Service Manual page 109

3-2. Defective faceplate
1) Bubble, Stone, and Blister, etc.
Mean diameter (*1)
(mm)
0.76
0.51 ~ 0.75
0.26 ~ 0.50
0.11 ~ 0.25
Note (*1) Mean diameter shall be either one of the following values, which is smaller.
(a + b) / 2 or a / 20 + 2b (a: length, b: width)
Note (*2) Maximum 5 pcs. In area of Φ 10mm.
2) Scratch
Width more than 0.16mm
Width 0.11mm ~ 0.15mm
Width 0.06mm ~ 0.10mm
Width less than 0.05mm
3) Other glass defect
Flaw, crack and chip must not be visually noticeable.
See the limitation sample regarding iron rust and striae, etc.
Acceptable number of defect
Zone A Zone B
0 0
0 1
2 3
- -
Not acceptable.
Length shall be less than 3mm
Length shall be less than 26mm
No length limitation
6-5
Minimum interval
(mm)
A + B
0
1 30
5
(*2)
-