Electronics Forum | Thu Nov 30 10:38:39 EST 2006 | billwestiet
You are cooling too fast, and some flux and paste is worse than others... Can you control your cooling zones? Water Temp (higher)? Or Water Flow (less, effectively less cooling)? Changing water temp is prefferable over flow if you can do it. I h
Electronics Forum | Thu Nov 30 16:31:40 EST 2006 | techgonecrazy
This has been a problem from the start. I used a digital flowmeter to check exhaust and both sides are pretty even, however, I do not know if its exhausting too much or not enough, just going on the PE specs...but then again...do they really know. I
Electronics Forum | Thu Nov 30 08:15:16 EST 2006 | jdengler
If you define cycle time as the time it takes to complete one board it is a useless number. What you need to know is the time it takes to complete one board and start the next board. This means first fiducial on first board to first fiducial on th
Electronics Forum | Thu Nov 30 08:09:19 EST 2006 | INGE
Hi everybody, The matter is this: after reflow, on top side leads of chip components (resistor 0805)appear some empty balls of solder. In some cases this thing is only on the lead and the solder joint seems good, in other cases this empty ball is als
Electronics Forum | Fri Dec 01 08:09:08 EST 2006 | CK the Flip
Square-leaded pin headers will typically bridge at the trailing edge (last couple of leads), since during peel-back, the solder at the trailing edge has "nowhere to go". If you have control over designs, ask your designers if they can put solder thi
Electronics Forum | Mon Dec 04 21:42:12 EST 2006 | KEN
Keep in mind that device pitch, pad geometry, lead length and even alloy type will play a roll in your evaluation. I have an assembly that we run 10k pieces per month. One two-pin connector has a pitch of 1.27mm. Unfortunately, the pads are 0.007"
Electronics Forum | Fri Dec 01 06:31:53 EST 2006 | CHITRA K
We use SMBJ5.0A - D0214A package component in our products.During production recently we have identified a seroius problem. The problem is, After reflow soldering the impedance becomes more / lesser and due to which the product does not work since th
Electronics Forum | Mon Dec 04 20:32:40 EST 2006 | billwestiet
To answer your question specifically: http://www.pkaymetal.com/dross.php4 NOW, I can not reccomend for or against this!!! Do your homework, call PK, talk to thier technical people. this product absolutely works in some applications. Primarily hig
Electronics Forum | Mon Dec 04 11:28:44 EST 2006 | samir
Patrick, Have you seen Al Gore's documentary on Global Warming, "The Inconvenient Truth?" It was okay, but I didn't like how Gore got political in a few scenes by slamming the current administration's environmental policies (or lack thereof...c'mo
Electronics Forum | Mon Dec 04 18:29:47 EST 2006 | SWAG
Some production problems we've faced: 1) Delamination; 2) Reflow fixture distortion; 3) Obsolete parts; 4) Failure of blower motor bearings in older reflow ovens; 5) Poor toe fillets with miniSOTs on thicker PCB's; 6) Lack of updated component data s
