Electronics Forum: pcb and flow and chart (Page 1 of 2)

LGA and Solderballs

Electronics Forum | Tue Nov 28 21:16:17 EST 2006 | davef

J Rose at EMPF says: The introduction of no-clean solder fluxes in electronics manufacturing has given rise to greater levels of solder balling simply because the opportunity to remove them in the wash process does not exist. They are typically cause

Solder beads and wave soldering

Electronics Forum | Wed Jul 05 13:30:37 EDT 2006 | Chris Griffin

Likely causes of this are: -Preheat temp. too low -too much dross -uncured epoxy -PCB contamination ...also varify the solder flow over the wave is smooth.

CIM systems and Final Assembly

Electronics Forum | Mon Jan 22 15:01:32 EST 2001 | aiscorp

CIM systems for electronics assembly have traditionally considered the PCB only. Final assembly "modules" are often attached to traditional systems to accommodate this common requirement for pre-PCB assembly, mechanical assembly, and final assembly

Coils and Water Soluble Fluxes

Electronics Forum | Wed Oct 10 13:51:08 EDT 2007 | petep

Coilcraft has posted the following and I am wondering how you folks are handling the use of coils in a Water Soluble world. PCB Washing and Coilcraft Parts Coilcraft tests for resistance to solvents per the following specification: Resistance to s

Screenprint Characterisation and PCB landscape analysis.

Electronics Forum | Mon Dec 08 16:10:02 EST 1997 | Donnacha Nagle

Q1. As part of a Final Year Thesis I am currently undergoing an in-deph study of the Screenprinting process for MPM 3000 Screenprinters. Ultimately I will be setting up control charts on line. Does anybody have suggestions in this area ?, I have alot

CCGA - Stencil design and Reflow Profiling

Electronics Forum | Thu Aug 22 22:19:13 EDT 2019 | sssamw

From the picture you present, it is a pin in paste part with pin length 2.2mm (a good length for 1.6mm PCB thickness), and seems the pin tilted and touch on PCB surface, thus causes up-part. Sorry I cannot image pin tilted not before placement but i

Pick and Place machine dropping parts

Electronics Forum | Mon Jul 13 06:30:59 EDT 2009 | hcarrasco

1.- Check your vacuum a.- Check filters b.- Check air flow (the vacuum is generated by a Ventury using air flow, not air pressure) c.- Vaccum vias (Possible linth inside the vacuum lines) 2.- Check the nozzle condition (Probably broken o

Re: Screenprint Characterisation and PCB landscape analysis.

Electronics Forum | Tue Dec 16 14:48:03 EST 1997 | Justin Medernach

Q1. As part of a Final Year Thesis I am currently undergoing an in-deph study of the Screenprinting process for MPM 3000 Screenprinters. Ultimately I will be setting up control charts on line. Does anybody have suggestions in this area ?, I h

Clearance between Through hole and chip component

Electronics Forum | Wed Feb 28 00:01:47 EST 2007 | Muhammad Haris

Hi, The distance between the two terminations/endings/pads of 0603 (0201)is 0.15mm i.e. lesser than than the distance between the 0603 and through hole i.e. 0.5mm My ques is that, then why its termination doesnot short as it has a minimum distance.A

0402 tombstoning and dewetting on QFP256 trade-off

Electronics Forum | Thu Mar 05 11:53:09 EST 2009 | dcell_1t

Hello to all. for certain time, we have been struggling with some issues on a PCB where have tombstoning on 0402 components (due to pad design) and dewetting in qfp256 0.5 mil pitch (discussed on another threads on this forum) component, we have pro

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