Electronics Forum: after (Page 131 of 698)

Solder paste amount

Electronics Forum | Tue Jan 16 21:00:11 EST 2001 | davef

Two good sources of information are: 1 IPC-7525 Stencil Design Guidelines 2 SMTnet fine Archives [once the guys get them back up and running after the conversion is complete]

BGA shorts

Electronics Forum | Wed Feb 14 16:03:54 EST 2001 | lileubie

Do you have a stencil wipe step after every six boards? If so, the wipe either automatic or manual needs to be optimized. Either less solvent or more time for the solvent to evaporate off.

Solder balls on solder side!!

Electronics Forum | Tue Feb 27 22:04:45 EST 2001 | hany_khoga

Dear all: I need to know why do I find a lot of solder balles every where on the solder side of my assemblies after coming out of the wave solder machine. How can I avoid this? Thanks Hany

White powdery residue following Wave

Electronics Forum | Fri Mar 02 15:52:19 EST 2001 | jagman

This happens to be after the water wash process. These are Burn-In boards so an SMT epoxy is used prior to wave. The flux used is Kester 2331ZX. Would using a thinner cause this to occur? The residue is all over the board. Thanks.

Reflow of 0402 capacitors

Electronics Forum | Thu Mar 08 16:02:18 EST 2001 | gsmguru

Have you considered a different solderpaste ? A different flux chemistry may help. The metals content wouldn't have to change. Just go after a slightly more aggressive flux.

Baking boards

Electronics Forum | Tue Jun 13 12:00:15 EDT 2000 | Brian Larson

How long and at what temperature to you bake through-hole boards for moisture? I am getting blow holes after the wave solder. Everything points to the drilling of the board, but I need to prove that it is not moisture.

Solder balls

Electronics Forum | Wed May 02 13:59:20 EDT 2001 | kt

Can anyone tell me what they think is the main cause of excessive solder at the end of the lead after wave. These are not solder peaks as if the leads were cold. It is a well wetted ball of solder on end of the lead. Also, some times you see excessiv

White spots on PCB

Electronics Forum | Sun May 13 21:02:34 EDT 2001 | djarvis

Gary, You're not trying to clean these boards with Iso or other solvents after using no-clean solder paste? That'll do it.

Automated soldering / PCB in plastic

Electronics Forum | Fri May 11 16:06:49 EDT 2001 | Charlie

How to solder one zero ohm 0805 resistor to a PCB after it is mounted in it's plastic. The Panasonic "Soft Beam" would do it if money were not a factor. Is there a similar type of soldering station out there that may just bolt to an existing conveyor

E-mail

Electronics Forum | Thu Jun 07 15:11:11 EDT 2001 | jax

Is SMTNET having a problem with E-mail services? I am recieving e-mails 3 to 4 days after it was sent, if I am recieving it at all.


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