Electronics Forum: rework (Page 186 of 293)

Nordic aQFN73 stencil design

Electronics Forum | Tue Apr 10 08:37:36 EDT 2018 | davef

Hi Steve ... I found nothing in the manufacturers "paper" to help. Comments are: * I agree. No blobs. Solder on the thermal pad should me minimized. Too much solder will float the component. Old timers used to talk about 50-80% coverage. * If you'

Solder Ball Dispersion Test (String Solder)

Electronics Forum | Thu May 03 12:59:55 EDT 2018 | donnie15

Our customer is asking for a solder ball dispersion test on our string solder for rework. The do not provide a test spec, only the attached diagram? has anyone seen this before? It looks like just pushing the solder against the iron and counting th

Rework Station for Large PCBs

Electronics Forum | Tue Jul 24 03:30:53 EDT 2018 | lraymond

Please take a look at the model DEN-ON RD500V series machine , it can handle 700 x500 mm (28" x 20 ") and can also be customized for larger PCB. The company is quite reliable (55 years old) and makes very strong equipment. http://denondic.co.jp/en/

Rework Station for Large PCBs

Electronics Forum | Tue Jul 24 20:07:31 EDT 2018 | lraymond

24") The RD500V has three heaters and it uses a combination of hot gas and IR. The area heater can range from 3600 watts to 4800 watts with a bottom localized heater that is 1 000 watts which has adjustable z movement. The price of the RD500V series

Reflow soldering issue

Electronics Forum | Thu Aug 30 15:37:04 EDT 2018 | davef

What if you were this guy [PeteC] and you knew this batch of boards had some goofball issue that messed with product quality, increased rework and all that AND you still had to run them? I've had to eat from the pie before. I'll bet you have also.

QFN Rework Issues

Electronics Forum | Wed Feb 13 13:44:03 EST 2019 | SMTA-Joe

I actually have a quote for the larger TF2800 from the rep that came to do the demo on the smaller model. There was talk of us sending hardware to PACE for them to see if they could get the larger model to work for us, but the decision was made not

QFN Rework Issues

Electronics Forum | Wed Feb 13 16:38:56 EST 2019 | spitkis2

BTW - in our testing on housings with Sn42Bi57 paste, it took 240 seconds to reach 140C on an aluminum module with a mass of 0.75 lbs. This was from ambient and only using machine preheating before having the top heater turn on to peak at 162C. Sa

QFN Rework Issues

Electronics Forum | Wed Feb 13 20:27:02 EST 2019 | SMTA-Chris

We’ve done similar projects. FR-811 with camera system for alignment. More cost effective than split vision. Bottom heat uses solid surface for contact heating similar to heating microwave module chassis. Our rep can arrange a demo if you haven’t

Reflow solder microSD card directly to PCB

Electronics Forum | Mon Sep 23 11:13:12 EDT 2019 | tsauve

I forgot to update this. Customer insisted on reflowing SIM card directly to PCB, as per their previous CEM. It worked. No deformation of the SIM card - assembly works - records data to SIM card. Note that using hot air reflow type (rework station)d

Do you allow manufacturer changes to your PCB design?

Electronics Forum | Thu Dec 26 12:51:32 EST 2019 | emeto

Very broad topic. Designers own design. Manufacturing engineers can suggest design changes based on DFM, DFX DFA analysis. These are suggested, so the board is manufacturable with very low to no rework. Both design and manufacturing have their expert

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