Electronics Forum | Wed Apr 25 16:35:55 EDT 2001 | Steve
Most of the time, we have very few skewed parts so I feel comfortable about the processes in general. However once in a while, often enough to throw off the first pass yield, we will get a few boards with a lot of skewed parts. By skewed I mean that
Electronics Forum | Thu Jul 19 22:42:04 EDT 2001 | jax
I assume since you talk about adjusting the locking pin and changing tooling you believe the part is not being held down with enough force while being reflowed. Is this because the insufficent and open solder you mentioned is the lead sitting on top
Electronics Forum | Wed Dec 29 18:01:13 EST 1999 | JAX
What's happenin Larry, I am not sure if bump proccess E is available on this particuliar software rev. but I have forgotten?????? It shouldn't matter; bump proccess A will work fine. The only things you have to do is make sure the pick up point
Electronics Forum | Thu Dec 16 20:55:09 EST 1999 | TNT
Hey Henry, Tombstoning can result from many different conditions: 1. Look at the part placement under a microscope before the board has been reflowed. Is it centered perfectly on the pads? If not, the part might migrate towards one pad during reflow
Electronics Forum | Mon Dec 06 00:22:41 EST 1999 | Greg H
Hi All, I have this problem sorting out the percentage of allowance that we need (per component) for our SMT machine attrition rate. When you say 1%. Say I have a PCB with 3 types of SMD components, type X is using 30 components, type Y is using 5
Electronics Forum | Fri Nov 19 14:50:46 EST 1999 | nick mata
If you are seeing reflection on the underside of the part, I would first begin with the recommended light levels for the BGA. You should be able to obtain the levels from the Siemens help desk. There is a 2 to 3 page document with levels for a variet
Electronics Forum | Sun Nov 14 20:52:38 EST 1999 | chartrain
What is your definition of a lot of money for a UPS? You mention very expensive components on your boards. What is their worth comapred to the UPS? A generator hooked to the conveyor would in theory work. but what is the cost of the generator? Who wi
Electronics Forum | Mon Nov 01 22:16:04 EST 1999 | Dean
Without a detailed description of the suspect parts It is difficult to pin-point the exact solution to your process problem. However, whenever possible avoid non-value added additions to your current process. Here is the reality of the situation:
Electronics Forum | Fri Nov 26 03:29:00 EST 1999 | TIM GOODMAN
HI WELL WE HAVE PLACED BGA,S AT A COMPANY ON A TRIAL BASIS, THE ONLY PROBLEM IS THAT YOU USE A PART DATA WITH A SQUARE PART IE PART TYPE 2 WITH A VERY SMALL BODY TOL .THIS WORKS WELL ON LARGE BGA,S BUT PLEASE PRE ROTATE AND MOVE AS SLOW AS POSSIBLE.
Electronics Forum | Thu Oct 14 09:01:59 EDT 1999 | Bruce
Why not to use an MCS30: Hardware is proprietary, OS-9 format, expensive to fix or replace, support, slow, RS-232 or ethernet hookup for CAD download, flat file format. F4G: PC is purchased by you, WindowsNT 4.0, inexpensive to fix or replace, supp
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