Look for a metal desk, there should be a paper with a password (SKYWOVSKY, or something similar), just use the password and you have granted acess to the first floor. If Skynet joins your group, it disable all forcefields, for all floors.
For more help at SAD, I recommend you to read this:
[url=http://user.tninet.se/~jyg699a/fallout2.html#sad]http://user.tninet.se/~jyg699a/fallout2.html#sad[/url]
May contain some spoilers, so if you want to figure things all by yourself, don't click on the link.
About trying to disable forcefields with repair skill, if your skill isn't good enough, you can set the difficulty level to EASY, if you are at NORMAL, or EASY/NORMAL, if you are playing in HARD difficulty. This will raise your skill percentage. After using repair, you can go back to the difficulty level it was before.

Thiev got what I was looking for. And just FYI, I failed 3 times with 59% Repair & set off the robot guards. But when I used the Tool, I made it on my 2nd try.
Drelmanes, I should've specified that I'd already found the password to the 1st level forcefields. But yeah, I pretty much WORSHIP that Fallout walkthrough website. For some reason, I just couldn't figure out that I needed to Repair the emitter...although, now that I think about it, its probably because the Manipulate icon doesn't come up on it.