I found this good video showing the process of multi layer PCB in a fabrication house. I didn’t know it involves so many steps just to produce a PCB. Great info.
Step 01- Introduction – Eurocircuits Educational movies – making a PCB
Step2 – Front End Tool Data Preparation
Step 3 – Preparing the Photo Tools
Step 4 – Print Inner Layers
Step 5 – Etching Inner Layers
Step 06 -Register punch and Automatic Optical Inspection (AOI)
Step 07 – Lay-up and bond
Step 08 – Drilling the PCB
Step 09 – Electroless copper deposition
Step 10 – Image the outer layers
Step 11 – Plating
Step 12 – Etch outer layers
Step 13 – Apply soldermask
Step 14 – RoHS-compliant surface finishes – electroless gold over nickel
Step 15 – Plated gold edge connectors
Step 16 – Silk-screen and cure
Step 17 – Profiling
Step 18 – Electrical test
Step 19 – Final inspection
