Electronics Forum | Tue Jul 18 16:40:09 EDT 2006 | dphilbrick
We have a system where when we set up the line to run a job before the first part is placed an auditor verifies we have all the correct parts loaded on the machines in thier correct locations. We then run a first article. The board is inspected to in
Electronics Forum | Fri Jul 24 12:12:52 EDT 1998 | smd
200 boards/Hr and oven will reflow ~180 boards/Hr but the P&P machine will only place 700-950 CPH | | when setup is taken into account. Minimum pitch is normally .020" and we place an Avg. of 491 TSSOPs and 217 BGAs a month. | | We don't even bother
Electronics Forum | Tue May 05 11:12:01 EDT 2015 | anirudh_thabjul
Thankyou once again dude. Please Don't mind it. I have one more doubt regarding the Max.Power Rating of SMD Resistor. ---"Is same principle which you told application for Maximum Power rating Of SMD Resistor also"?--- i.e Higher Powerrating is
Electronics Forum | Wed Aug 11 06:27:07 EDT 2021 | danisa
Hi all, The PCBA was swollen after SMD It is hard PCBA with 6 layers and SMD both sides Defect rate: ~ 5% Phenomenon: swell at the same side, same position (at 2 IC positions). Did not find any abnormality in SMD process as well as storage condition.
Electronics Forum | Thu Sep 09 19:32:12 EDT 2021 | kumarb
Forgot to ask earlier - what is the TG rating for your laminate? If not selected already, use a high TG rating like TG155 or TG170 laminates for the ROHS temps. Never saw swollen PCBAs with such rated PCBs to date.
Electronics Forum | Thu Jul 25 06:14:21 EDT 2002 | matherat
Defect rate is a variable that is hard to evaluate from company to company. Look into solid solder deposit which will eliminate smd scrap/defects all together, no matter who assembles it. http://www.sipad.com mk
Electronics Forum | Tue May 05 09:58:51 EDT 2015 | anirudh_thabjul
hi everyone, I have done with my PCB Prototyping. I need to Prepare a Bill of Materials(BOM) for my PCB Assembly. I have one doubt regarding selection of SMD Capacitor. -My Question is For Example, I have to use 0.1uF capacitor on my PCB board.In
Electronics Forum | Tue Dec 30 20:48:31 EST 1997 | Tom Gervascio
Has anyone had any experience with thermal shocking and cracking of SMD capacitors during the rework process? My company was advised to preheat capacitors to 125 C at a rate of 2 C/sec before replacing them onto boards. Would this maybe degrade c
Electronics Forum | Wed Jun 19 02:42:26 EDT 2019 | relaycz
In my opinion, fault lies in printing or reflow. With printing - it's either too much solder paste or bad print, though I would assume that would be caught. With reflow, it could be that ramp up rate is too high.
Electronics Forum | Thu Jan 01 13:04:42 EST 1998 | scott cook
| Has anyone had any experience with thermal shocking | and cracking of SMD capacitors during the rework process? | My company was advised to preheat capacitors to 125 C | at a rate of 2 C/sec before replacing them onto boards. | Would this maybe
