Electronics Forum: double sided pcb (Page 8 of 194)

BGA Bouble sided reflow overlapping

Electronics Forum | Wed Jan 05 11:01:37 EST 2000 | Ron Lahat

I have in design a 400mm x 400mm pcb 3.0 mm thick heavily populated with BGAs 50 mil pitch and want to run a double sided reflow process with overlapping BGAs (CS/PS) 1. can I avoid a selective jig for PS BGAs?(weight calculation ?) 2. Is it possibl

Re: Double sided parts stuffing

Electronics Forum | Thu Nov 18 09:34:58 EST 1999 | Wolfgang Busko

Hi Will, it�s possible to use second reflow for second side components without glueing or use of different alloy solders. Although the first soldered joints become liquid during the second pass the parts will not fall off as long as their weight does

Product Changeover (SMT double sided)

Electronics Forum | Fri Oct 26 11:37:27 EDT 2001 | Dave G

You could start by putting together a matrix of P/N's vs product. This will tell you which parts are common with most of your jobs. These would then become part of a fixed feeder setup that would stay on the machine. (These will probably be mostly R'

Repair of FR4 double-sided pcb

Electronics Forum | Fri Aug 23 09:25:53 EDT 2002 | Dave Milk

Thanks for your help, Dave.

Repair of FR4 double-sided pcb

Electronics Forum | Mon Aug 26 20:29:10 EDT 2002 | davef

Sure, the 'Cheese It' Defense is an analog of the 'BIG GULP of Dew' Defense.

double printing

Electronics Forum | Tue Mar 20 09:11:32 EDT 2007 | scooter

Is there any down side, besides time, in printing the same board in both directions? bill

Repair of FR4 double-sided pcb

Electronics Forum | Mon Aug 26 17:27:28 EDT 2002 | dragonslayr

first time I've heard of the Cheese Its defense to excuse any momentary lapse of reason. I think I'ma gonna order me a case of them nibbles right away. A guy can't be too careful now adays.

Repair of FR4 double-sided pcb

Electronics Forum | Fri Sep 06 13:45:02 EDT 2002 | Cris Campos

To Scrap or not to Scrap? We have the answer to your problem. Visit http://www.circuit-techs.com for more information regarding Printed Circuit Board Repair, Rework & Modification in accordance to IPC 7711 & 7721.

Reflowing BGA's 2x on a double sided board

Electronics Forum | Fri Feb 23 15:31:31 EST 2007 | realchunks

Running the BGA first is OK. We run double sided BGA baords all the time without problem.

Reflowing BGA's 2x on a double sided board

Electronics Forum | Thu Mar 01 11:47:20 EST 2007 | Wagoner

Run the lead free BGA side first. Then run the tin lead side second. We do this on some boards so that we don't overheat the components on the second side. There is no reason that the lead free solder needs to reflow on the second pass.


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