Electronics Forum | Wed Feb 09 21:33:32 EST 2000 | Dave F
Ashok: I have three answers to your questions on moisture sensitive devices: 1. What is general practice on incoming / receiving inspection of moisture sensitive devices- which boils down to mostly FPDs and BGAs ? Traditionally, FPD packs were opene
Electronics Forum | Mon Feb 07 13:26:14 EST 2000 | Dave F
Spacerwoman: Carol is a professional spacer problem fighter (we think). When people have problems with spacers, they call on SPACERWOMAN!!!!! Here she is to save the day � ;-) Selecting a spacer made of brass is a good choice for many applicatio
Electronics Forum | Sat Feb 05 05:10:53 EST 2000 | Dean
It would be helpful to have some additional info on your line and process. Lets make some assumptions... Consider: re-tooling costs for your fab supplier. Can your supplier hold the additional tollerences for a larger panel. Can your supplier fab
Electronics Forum | Thu Feb 03 11:40:41 EST 2000 | g cronin
Looking through this months SMT mag every other page has an add for a new AOI system. This forum has had a few disscusions about these sytems but I think its time to have a good one. It seems like the technology may be getting to the point that it
Electronics Forum | Sat Feb 05 09:13:39 EST 2000 | Dave F
Hany: In response to your questions: 1- In a double wave solder M/C, is possible to completely eliminate the second wave without affecting the quality of the solder joints? Many w/s machines have a turbulent wave and a smooth wave. The turbule
Electronics Forum | Thu Feb 03 11:20:15 EST 2000 | John O'Brien
This is getting to be a more common practice, especially with the application of a 2-D bar code directly to the board (via laser, ink jet,etc.) Some really major companies are jumping on the bandwagon because it also allows treating each board as a l
Electronics Forum | Tue Feb 01 07:50:25 EST 2000 | Jason Bentley
This all depends on the mixture of your solder. If you are using water soluable flux then it will get clean. But not alcohol based flux. As for using the ultrasonic this might be a problem I personally have never heard of someone washing a board in a
Electronics Forum | Tue Feb 01 21:48:12 EST 2000 | Dave F
Guo: You want to know: 1 Can I use water as the solvent in an ultrasonic machine to remove solder paste from PCB? Continuing from Jason�s comments: Sure you can use water as the solvent to remove solder paste from PCB, but recognize that some flu
Electronics Forum | Sat Feb 05 21:58:08 EST 2000 | Stu Leech
I agree with all of the previous comments. 1) Here are a few things to keep in mind when cleaning with water. To effectively clean, any liquid must wet the surface. By itself, water has a surface tension of 70 dynes/square cm. This is relaively hig
Electronics Forum | Mon Jan 31 14:08:26 EST 2000 | Ashok Dhawan
I have got a number of assemblies back from a customer with feedback that the solder fillet is less than 25% of chip height per IPC-Standard-610B Class 2. Most of my joints are having good wetting but fillet height does not meet min ht requirement of
