Electronics Forum | Thu Oct 15 14:23:31 EDT 1998 | Earl Moon
| I have a problem with measling on our PCB's. We saw it on our FR4 PCB's at final assembly yesterday. Is this a defect from the board vendor or something we did in our assembly process when building the PCA's (thru hole). Could the wave solder ma
Electronics Forum | Fri Nov 05 14:47:35 EST 1999 | Russ Cutler
We recently came to a cross roads... We have historically baked out ALL of our circuit cards, with a 2 fold purpose 1) to dry the part marking ink, and 2) to eliminate any moisture, which could result in measling further in the process of assembly.
Electronics Forum | Mon May 03 11:20:43 EDT 2010 | mikesewell
A good guideline is keep it similar to your wave solder process, for example 2-3 sec. This assumes you're preheating the assembly. While polyimide boards are fairly robust at some point you will begin to see copper dissolution - the solder side pad
Electronics Forum | Tue Oct 14 09:17:09 EDT 2014 | rgduval
You could check the data sheets/web sites from the manufacturers of the press-fit parts. They typically will identify the recommended tooling/equipment necessary to install their components. Generally, pneumatic presses are suggested, with controll
Electronics Forum | Mon May 24 10:45:04 EDT 1999 | John Thorup
| Can anyone help me with the correct baking cycle for removing moisture for PWB's. These are 10 layer double sided SMT. | | Thank You R. J. Klein Wassink in Soldering in Electronics states - 16 hours @ 105C or 40 hours @ 80C in a ventilated oven
Electronics Forum | Thu Aug 09 09:05:09 EDT 2007 | davef
There are no requirements acceptance criteria for baking of board assemblies. What are your customer requirements? The common reasons people choose to bake PCB are to prevent: * Delamination of multilayer boards * Measles, particularly on double si
Electronics Forum | Sat Dec 13 17:46:27 EST 2008 | ysutariya
If you're military then you're probably just needing standard 130Tg FR4 and tin-lead finish. I would check two things: 1. Bake temperature: Isola recommends 300F for 4 hours to drive moisture out. Lower baking temperatures do not require a linea
Electronics Forum | Fri Jun 19 07:28:56 EDT 2009 | mhunter
Thank you for your responses Davef and Boardhouse. The material used is Iteq Corporation IT-180. I performed more testing yesterday and found the following: I could insert Berg Pins into the assembly at various locations or a Pem. None of these
Electronics Forum | Mon Feb 02 03:23:26 EST 2015 | alexeis
Hi, Most of our customers perform DNI check. Some of them give a special focus on the issue when it is a new product (NPI) or change version (ECO/ECN). Our customers perform tests on AOI machine and feed the results into a software tool called TopoQ
Electronics Forum | Mon Dec 08 17:06:59 EST 2008 | boardhouse
Hi MGL, Couple things to ask, have the boards recently been changed to Rohs builds? STD FR4 to High TD Laminate. Check the stack-up the board houses are using. Just about all Rohs laminate has Resin starvation issues when used in single ply co
