Just as a little update, I took some time away from other projects today to look over DOS's two SBs.
Both are able to be revived. In fact one is up and running right now, playing Ga Ga Ga Ga as I type.
DOS managed to lift the traces from about four leads to the DAC chip in an attempt to upgrade to the KE version.
The KE chip is the exact same chip as the 1748 used in the early SB, except the KE was tested. The stock chip may meet or even exceed the tests, but the labor wasn't spent to hook it up to the test gear.
Anyway, I did have some KE versions on hand. I used some 24 awg, lacquered, Cardas, solid core copper wire to replace the traces and run to the chip leads. I also ended up replacing the DAC chip supply caps and ran the output of the DAC chip direct to DOS supplied BlackGates to the Cardas jacks.
For any who would attempt to work on the small surface mount parts on a SB3, the BEST thing to get would be a magnifying lamp to be abel to see exactly what you are doing. A temp controlled soldering station is another good thing to have.
DOS' 2nd SB is able to be brought back to life, as well. SO he will get two working SB's back. I do hope he will be a bit more careful about DIY projects in the future. Having and using proper tools is a big ingredient to a successful completion of a mod. I would also suggest some practice in removing and installing SM parts on a scrap board before you work on something that could cost you a bit of money if you make a mistake.
