Notes:(unless otherwise specified)
1. must comply with PCC general specification 64902267
2. part to be packaged to prevent damage and contamination during shipping and handling
3. this note not used
4. tolerance on all conductors to be +/-0.001.
5. spaces between conductors to be 0.0012 minimum
6. all solder pads to be captured by cover layer on 2 corners min for square pads and 270 deg.min.around for round pads.
7. isolated defects shall not reduce conductor width or spacing to less than 75% of design width
8. areas indicated by 8 to have 5052 H34/36 aluminum stiffener 0.16 +/- 0.002 thick to be applied to farside. Die-roll side to be adhered to PCC. Flatness to be 0.005 per inch.must pass corrosion resistance testing per seagate specification 20400058-001.
9. all rectangular cover openings to have 0.010 corner radll.
10. all inside and outside corners rad. 0.010
11. tolerances:
A. perimeter and hole to trace:+/- 0.005.
B. trace to coverlay:+/- 0.005
C. perimeter and hole to stiffener:+/- 0.004.
12. material: base layer : 0.005 +/- 0.0003 thick polyimide vendor pn FA8535HRA, PN
K1/2-L-HA
cover layer : 0.0005 +/- 0.0003 thick polyimide vendor PN EA0050,
PN K1/2-KV32
Circuit layer:0.5oz soft rolled copper
Total thickness: 0.0025 +/- 0.0004 excluding stiffeners.
Papt must meet ul 94v-1 or better.
13. Exposed copper to be coated with entek CU106A+ (thickness to be 14+/-6 microinches at point of application) or glicoat E2L (thickness to be 9+/-3 microinches at point of application).as measured with UV spectrophotometer.
14. Part must meet cleanliness requirements per seagate specification 200800010-240.surface area=17.37 SQ.centimeters
15. All critical parameters identified with @ must meet the process control and capability requirements of seagate specification 75791201.
16. Adhesive must meet requirements per seagate spec.64902255.
17. Refer to artwork no:D0000167457 REV.B.
18. Identify and package per seagate specification 30228-001
19. Coverlayer opening locations are defined by artwork
20. This is not used.
21. Stiffener adhesive allowance:
A. fully cured adhesive,with no stringers,is allowed on the polyimide surfaces overhanging the stiffener in the F.O.S. slot areas.
B. Fully cured adhesive,with no stringers,may be visible along the perimeter edges.perimeter edge dimensional specifications must not be violated when including the visible adhesive.adhesive may be recessed from the perimeters up to 0.010 max.
C. Adhesive along the stiffener edges under the polyimide is preferred flush to edge of stiffener,but may extend up to 0.020 max onto polyimide,and must be fully cured,with no stringers.adhesive may not be recessed from stiffener edges.
22. Dimension is to theoretical sharp corner.
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May be we're all wrong.Just yesterday...也许我们都错了,就在昨天...But I donn't give up easily.但我不会轻易放弃.You were life-time-promise! [You were a life-time promise!]你曾是一生的约定。(你的句子用的是过去式,所以我用曾)I wanna make you see 我想让你看见 Just ...
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gracious invitation: 诚恳的邀请 a distinguished group:杰出人士 寄托:have someone look after sb; entrust the care of 外宾专用别墅 : special villa for foreign guest look over the seas :往海边望 字面意思:literal meanings;下榻 :be state 国际机票: international ticket school break:...
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