| I'm running memory module product- SMT double reflow ( 12 modules per panel). I'm using the epoxy base solder paste in order to reduce the flux spattering problem onto the gold finger which could lead to the intermittent contact problem. | | I don't face much problem on flux spattering but lately solder on gold seems to be my biggest evil. FYI, I use pallet for my reflow ( which is also gone thru the frequent cleaning process ) | to compensate the warpage problem. Pls help me to encounter this problem. My major suspect was from the ineffective underscreen cleaning but after a lot of effort/focus had been put in placed, the problem still exist. Pls, all the expert out there....hellllllppppppppp!!! | | cheers.. | zambri | | Zambri
The problem with trouble-shooting from afar is if you don't have enough info it's difficult to offer solutions.
If the problem is on every board, then inspect the boards after every step in the process under a Scope until the solder shows up.
If the problem comes and goes like 1 out of 20 boards has the problem, then take a look at the handling of the boards, such as contaminated work surfaces, operators with solder paste on the hands etc. You can identify these operators by watching for nervous twitches (from too much lead in the blood); but then again it could be an engineer looking for solder on gold contacts.
And it wouldn't hurt to check the boards before running them to make sure the problem isn't coming from the board vendor.
Lot's of luck
Mike
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