Electronics Forum | Thu Mar 17 22:47:29 EST 2005 | davef
That would be our first guess, also. Get the stuff analyzed to be sure. Another clue is if the white stuff disappears when you hit it with hot air from a rework station. The hot air is activate the flux. Good troubleshooting tool, but you're subj
Electronics Forum | Thu Mar 17 11:07:08 EST 2005 | Dougs
I'd agree with Justin, we do double sided reflow on most of our boards with fine pitch QFP's both sides, you do have a problem somewhere else, what size is you board? Is it warping slightly? What kind of oven are you using? Is it convection? fans
Electronics Forum | Mon Mar 21 09:50:29 EST 2005 | davef
It's possible to remove 1mm from each side of the board. Obviously, you need to avoid damaging the board circuitry or the display. If we were going to try this, we'd poke the working end of a Sears router through a hole in the table and fixture a w
Electronics Forum | Wed Mar 23 20:44:25 EST 2005 | pmd
Sounds like EA has way too much free time on his hands. How are you taking a reading. What instruments are you useing to get a reading. What are you looking for? Voids? Adhearsion? Contamination? Why would you need to know what it takes to break a co
Electronics Forum | Fri Apr 08 17:23:34 EDT 2005 | KEN
Warpage factors can cause: 1. Boards can not transfer down conveyor belts or wedge at transitions. 2. May not enter into machinery due to interferences (like board clamps) 3. May fall off conveyor chain in furnace. Especially true of thin (PCMCI
Electronics Forum | Wed Apr 13 15:21:25 EDT 2005 | mmjm_1099
Thats called technician syndrome (fine when your there and bad when you walk away). Is someone inspecting the board before reflow? If so make sure they don't touch it and run about 5 boards and see if it's consistent for placement. What type of pro
Electronics Forum | Tue May 10 12:12:42 EDT 2005 | dougt
We had an outside vendor that built a particular board for us. When there were problems with the new board 9 times out of 10 the case of the oscillator was shorted to the lead as mentioned in the post above. The fix would be to draw some of the sol
Electronics Forum | Tue May 17 10:27:02 EDT 2005 | johnw
Thanks Guys I am looking to enhance and utilise exsisting machines or a with a reduced investment ie I have already purchased printers and placement machines If I had line balancing software this would be great I want to input the present cycle time
Electronics Forum | Thu May 19 08:32:46 EDT 2005 | geb
I have a Universal GSM. Does anyone know the maximum width, between the conveyor rails, that a PCB can be. The GSM had an "Axis PWC error", which I think is down to the board width being too wide. This time I was able to halve the board width from 2
Electronics Forum | Wed Jun 08 10:32:27 EDT 2005 | rlackey
We ran an MVT 1820 Supra against a VT-Win-II for around 40K high density boards. One machine was 1/3 of the price of the other, more accurate in production, faster, and could handle larger boards. Guess which won? Fortunately we were able to loo
