Mitsubishi DPLUS 74SB -BKA Service Manual page 89

Standard
Average diameter classified by a contrast
(Note 1) (mm)
High contrast Middle
contrast
~ 0.10 ~ 0.20
0.11 ~ 0.25 0.21 ~ 0.50
0.26 ~ 0.50 0.51 ~ 1.00
0.51 ~ 0.75 1.01 ~ 1.50
Values inside [ ] represent acceptable number in low contrast.
See the table in the next page for total defect number, which is acceptable in low contrast.
NOTE 1 : Convert (a+b)/2 or a/20 + 2b small value into average diameter.
(a: length, b: width)
total number of a low contrast flaws
Standard classified by zones
Total ( zone A + zone B )
NOTE 1 : Acceptable interval shall be larger one in the case that defects have different interval.
NOTE 2 : There is no standard regarding zone C. Therefore, no defect is accepted that may deteriorate
the value of products. Defect level by consultation. Discuss is necessary.
NOTE 3 Tolerance of defect size is approx. 10%.
Allowable number
Low contrast zone A
~ 0.50 Ignore
0.51 ~ 1.25
2［4］
1.26 ~ 2.50 1［4］
2.51 ~ 3.75 0［4］
zone A
6
5-26
Allowable Length
(mm)
zone B
Ignore -
20
4［5］
2［4］ 40
1［4］ 80
zone B
8
10