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Subject: Re: [Homebrew_PCBs] Jumping chips

From: Donald H Locker <dhlocker@...>
Date: 2009-04-04

If you are in the USA, you could put in for a stimulus grant for additional
gravity in the area of your hot plate :)

Otherwise, I'd look at the preheat. Sounds like there is still moisture in the
paste.

Donald.

Jim Lewis wrote:
> I have a problem with SMT chips jumping off the board during reflow. I preheat for 2.5 minutes 1/4" above the hot plate and then reflow 1.5 minutes directly on the hot plate at 375F with a cover. Paste is from Stencils Unlimited. Any solutions?
>