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boards:sbc:sbc-386ex:rev2.0 [2018/12/03 19:22]
jcoffman [Hardware Documents]
boards:sbc:sbc-386ex:rev2.0 [2019/02/11 05:29] (current)
b1ackmai1er [Photos]
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-{{  https://​www.retrobrewcomputers.org/​lib/​plugins/​ckgedit/​fckeditor/​userfiles/​image/​boards/​sbc/​img_0941_sm.jpg?​nolink&​640x480 ​ |www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_boards_sbc_img_0941_sm.jpg}}Photo 3.  Two of the adapter boards for the 386EX.+{{  https://​www.retrobrewcomputers.org/​lib/​plugins/​ckgedit/​fckeditor/​userfiles/​image/​boards/​sbc/​img_0941_sm.jpg?​nolink&​640x480 ​ |www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_boards_sbc_img_0941_sm.jpg}}Photo 3. Two of the adapter boards for the 386EX.
  
-----+Suggested technique for soldering the PQFP-132 386EX:\\ 
 +\\ 
 +A. Coat the PQFP board pads with liquid flux. IMPORTANT.\\ 
 +B. (optional) Tin the board with a flat tip iron with MINIMUM solder. This is not necessary if the HASL layer has enough solder to attach the chip pins.\\ 
 +C. Coat the bottoms of the PQFP pins with liquid flux.\\ 
 +D. Position the PQFP; tack down corners with a DRY (solder-free) flat or wedge tip iron. Re-check positioning constantly.\\ 
 +E. Finish heating all of the pins with the DRY flat or wedge tip iron until all pins pass visual inspection under a jewelers loupe (8X) magnifier.\\ 
 +F. (optional) If you have a low voltage (<3v) tester, buzz out the connections with straight pins used as probes. This is tedious.
  
  
boards/sbc/sbc-386ex/rev2.0.1543882957.txt.gz · Last modified: 2018/12/03 19:22 by jcoffman
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