Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

Hi All,
Finally I have completed my printer modifications and successfully printed double layer PCB. I have used 31mils FR4 for easy cutting using my paper trimmer. The most difficult part was to solve the Y axis random starting position problem. I realized that it is because of optical sensor mounted on the printer head which I disabled. Now, instead of this sensor I am using slotted optical switch that was used as a paper detect switch on the printer. I assembled this optical switch to the left rear side paper entry of the printer and it detects small slot on the tray to find the Y axis starting position. I modified my paper emulator software to use this sensor signal.
Steps of the double layer printing
1-Drill PCB with CNC
2-Paper sand and clean the PCB
3-Roughly estimate the position of the printed image on tray and put drilled PCB to this location and loosely fix it by Scotch.
4-Cover PCB with transparency and securely fix the transparency by Scotch.
5-Print your with via/holes unfilled image on transparency
6-Now, using small PCB sticks align the holes of the PCB to the image on the transparency
7-Remove transparency
8-Reprint image with filled via/holes on PCB
9-Dry the image
10-Repeat it for solder side
11-Cure the PCB
12-Etch the PCB

I will upload the images to the photo's/volkan's folder. If high resolution images are required I can e-mail them.
Cheers
Volkan






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