Electronics Forum | Mon Aug 06 07:15:14 EDT 2012 | reypal
Hi to everyone in this forum. I came across this problem recently. Im not sure how it started and its rootcause. The chip resistor termination has been peeled off. Thanks in advance for all your advise.
Electronics Forum | Mon Aug 06 16:47:41 EDT 2012 | duchoang
Can you give more info: - Hand-soldered? Placed by Pick&Place machine? What kind of SMT machine? - Oven re-flowed? Temperature? - Any physical impact?
Electronics Forum | Tue Aug 07 01:19:49 EDT 2012 | reypal
Thanks DucHoang, More input: 1. Tin/Lead s.paste on Pbfree component 2. Machine pick and place 3. Reflowed@ 210-230C peak @ around 15sec. 4. Boards are subjected to washing process 5. This issue can be seen after washing process. Do you think it
Electronics Forum | Wed Mar 30 14:02:25 EDT 2016 | blnorman
The program I'm working on is having endcap metallization/resistive element failures. These are on MELFs manufactured by IRC/TTE (MCHP). A sister program is having the same issues. They pulled a couple of date codes and did visual examination and
Electronics Forum | Fri Sep 08 09:10:32 EDT 2006 | Claude_Couture
Hello all, The situation: We recently had 2 brand new solder wave installed, one after the other. On the first one, the "protective coating" on the solder pot started to flake off 1 day after start-up. The tech who did the installation witnessed it a
Electronics Forum | Mon Nov 22 08:30:53 EST 2021 | zxcvb
Hello there! In one SMPS, I noticed a blown resistor with the following color code: yellow (4) Violet(7) Gold(?) Gold Black. I'm not sure what the value is. The dimensions of the resistor are those of a conventional MF0207 metal film resistor. I assu
Electronics Forum | Tue Dec 14 12:41:56 EST 1999 | Kris W
Glen, Although the previous answers probably fit the problem you are having, we recently found that during pin insertion on an Autosplice machine, the gold was flaking from the pins and lodging between the legs of surface mount components. It would
Electronics Forum | Thu Dec 02 10:32:47 EST 1999 | Boca
Curtis, They have a 'permalex' coating bonded to the metal. We see no signs of flaking. They are pricey but they do work, we had metal blades from the OEM, they were absolute trash (not MPM). We run 16-6 and they last at least 4 to six months in
Electronics Forum | Tue Feb 14 06:15:52 EST 2012 | babithak
Can any one help me on articles about reasons for metal film resistor value drifting after working over a period of time Thank you
Electronics Forum | Thu Jun 01 21:54:00 EDT 2000 | Dave F
Jeremy: Standards: � A-600 talks about percentage of solder mask loss allowed, according to the location (eg, laminate, bare copper, gold or nickel, melting metals) and equipment class. � A-610 talks to "Solder Resist Coating - Voids & Blisters" by
