Electronics Forum | Wed Aug 13 16:38:00 EDT 2014 | anvil1021
We are seeing some PCBs especially from foreign sources that exhibit silk screen color change after reflow? Has anyone else seen this lately?
Electronics Forum | Wed Nov 07 17:06:56 EST 2001 | davef
Most of us, here on SMTnet, are either assemblers or sale types. Assemblers use stencils [metal foil, secured in a frame] instead of silk screens. Fabricators use silk screens in various photoimaging processes for applying etch resists, solder mask
Electronics Forum | Thu Jul 13 22:20:38 EDT 2000 | Dave F
=10 mils larger than lead 3 silk screen legend text weight >=10 mils 4 pads >=15 mils larger than finished hole sizes 5 place through hole components on 50 mil grid 6 no silk screen legend text over vias (if vias not solder masked) or holes 7 so
Electronics Forum | Mon Dec 10 13:23:51 EST 2012 | ericrr
Thank you ENIAC for your input. The engineer who did the PCB says all his figures are correct. I over came the problem by moving the X coordinateness of the 2nd BOC mark (top left on the picture) over just slightly in the file (measured by the dis
Electronics Forum | Wed May 23 02:45:37 EDT 2001 | johnluckham
I am looking for a way of removing screening cans from a PCB without reflowing the components siyuated under the can. I remember HP use to make a laser that could be used for this job, had anyone got, or had experience of this problem.
Electronics Forum | Mon Mar 16 16:57:59 EST 1998 | Earl Moon
| We have just go another batch of PCB's from our loaders, and some of the boards are severely warped. | The boards are PCI cards and one of the boards is 9mm out at one end. The PCB is 210mm long and 4 layers. | I am wondering if anyone knows what
Electronics Forum | Mon Mar 16 04:46:25 EST 1998 | Grant Petty
We have just go another batch of PCB's from our loaders, and some of the boards are severely warped. The boards are PCI cards and one of the boards is 9mm out at one end. The PCB is 210mm long and 4 layers. I am wondering if anyone knows what could
Electronics Forum | Mon Mar 16 09:07:14 EST 1998 | Justin Medernach
| We have just go another batch of PCB's from our loaders, and some of the boards are severely warped. | The boards are PCI cards and one of the boards is 9mm out at one end. The PCB is 210mm long and 4 layers. | I am wondering if anyone knows what
Electronics Forum | Thu May 27 14:44:05 EDT 1999 | Deon Nungaray
| One of our board fab houses is asking (again) to eliminate the reference designators and polarity markings from boards. This isn't feasible for thru-hole, but what is the industry trend on surface mount assemblies? | Deon Response: Hi Greg, Fr
Electronics Forum | Thu Mar 08 09:38:35 EST 2001 | blnorman
We've been using pre-printed labels on our PCB's for years, with 8 - 10 hours a week down time associated with them. Last October we put a CO2 laser marker on one of our lines. In 6 months we've had a total of 30 minutes down time. We use a 2D b
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