NEC MultiSync FE001SB, Service Manual

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5-27
2) Face plate defect
a. Blisters, opaque spots and elongated closed blisters
Average diameter (*1) Allowable number (pcs) Minimum Separation
(mm)
Zone A Zone B Total
(mm)
0.76 0 0 0
0.51 ~ 0.75 0 1 1
0.26 ~ 0.50 2 3 5
30
0.11 ~ 0.25 - - -
(*2)
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) Less than 5pcs. In area of 10mm diameter.
b. Flaw
Flaw Width (mm) Specification Length
0.16 ~ Rejected
0.11 ~ 0.15 Less than 13mm
0.06 ~ 0.10 Less than 26mm
~ 0.05 Unlimited
c. Other glass defect
Flaw, crack and chip must be visually noticeable.
See the limitation sample regarding iron rust and striae, etc.
6.2 AR-film Blemishes
6.2.1 Inspection conditions
1) Plate a CRT on the test table and illuminate the CRT screen surface by a fluorescent lamp.
2) The luminance on the CRT surface shall be set between 1000 and 1500 luxes.
3) Those not recognized with the naked eye at the viewing distance of 40cm from the CRT surface are not
considered to be defects.