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how to make 4 layer pcb4

Author : Luwis Date : 2014-5-4 22:31:40
We all know about the details for how to make 4 layer pcb according to before article,now let's sum up the all processes.
1) Inner Layer
Chemical Clean
Cut Sheet Dry Film Lamination
Image Expose
Image Develop
Copper Etch
Strip Resist
Post Etch Punch
AOI Inspection AOI
Oxide
Layup
Vacuum Lamination Press

2) CNC Drilling
CNC Drilling

3) Outer Layer
Deburr
Etch back - Desmear
Electroless Copper
Cut Sheet Dry Film Lamination
Image Expose
Image Develop

4) Plating
Image Develop
Copper Pattern Electro Plating
Tin Pattern Electro Plating
Strip Resist
Copper Etch
Strip Tin

5) Solder Mask
Surface prep
LPI coating side 1
Tack Dry
LPI coating side 2
Tack Dry
Image Expose
Image Develop
Thermal Cure Soldermask

6) Surface finish
HASL, Silver, OSP, ENIG
Tab Gold if any
Legend

7) Profile
NC Routing or punch

8) ET Testing, continuity and isolation

9) QC Inspection
Ionics
100% T/T test
Audit Sample Mechanical Inspection
Pack & Shipping


Please feel free to contact us if you have any question about
producing pcb.
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