bigmessowires said:

Elfen, how did you know D1 and D2 are diodes? Just from prior experience troubleshooting SE/30's? I guess since their names begin with D, that's a good clue too. If that is a SOT-23 sized footprint, then these diodes may work as replacements: http://www.digikey.com/product-detail/en/BAS16-TP/BAS16TPMSCT-ND/717314

Click to expand...

I have both a (non-working) SE/30 and a (recapped and working) Mac IIfx. I noticed the similarities of the part on both machines and remembered that the Mac IIfx board/schematics and the SE/30 has them as 5D. 5D turns out to be on a 3 legged diode where two legs is the diode and the third is not connected - according to the IIfx startup schematics, a MMBD914.

The part you listed should work, though Digikey has the diode in question, cheaper too (by 7¢):

http://www.digikey.com/product-detail/en/MMBD914-7-F/MMBD914-FDICT-ND/717888?WT.srch=1&WT.medium=cpc&WT.mc_id=IQ59989283-VQ2-g-VQ6-40609413315-VQ15-1t2-VQ16-c