PCB Assembly Blues
	-------------------
	
	Slumping is dreary,
	solder gets smeary,
	someone please answer my thixotrop query.
	To discard is a waste,
	but the flux is debased
	and I can't call this runny stuff paste.
	
	Ball grid arrays
	might be the new craze 
	in the circuit board real-estate daze,
	And I must confess
	I get pick-and-place mess
	when spacing is 12 mils or less. 

	HASL*, silver and OSP,
	these things make circuit boards pretty.
	When they've sat on a shelf 
	for more than I know
	I only hope they reflow.

	Since the customer asked,
	I laid blame on the mask
	for the shorts he observed in the past.
	FR-1, FR-4
	it's an incomplete cure,
	and I've seen this old problem before.

	If the pin test goes well,
	then no one can tell
	that the solder pot smoked and developed a smell.		
	I'm not one to shirk,
	but as long as things work,
	who gives a darn that the line went berserk.


Happy Holidays

-- 
Karen Tellefsen
[log in to unmask]

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