Short Tactic Overview

1. Light bomb: (white animation arround you)
   Deals damage to player arround you, move away from them fast.
2. Gravity bomb: (purple animation)
   Same like the Light bomb, you have to move away from the raid as you
   will do dmg to them.
3. DPS the Heart
   When XT-002 drops his heart, you have to do all the DPS you can do, but don't
   kill the heart, this will trigger Hardmode which will reset the hp of XT-002.
4. XE-321 Boombots need to killed by ranged dps
   they explode when get killed, so its best if they die near other mobs or the heart.
5. XS-013 Scrapbots need to be aoe'd
   They heal XT-002 for 60k if they reach him

Enrage timer: 6 minutes.

Healing at XT-002

The hard part for the healers in this fight is when XT-002 starts to aoe damage the whole raid. In this time all healers have to do whatever they can to keep the raid alive, if you let people die in this phase, you loose to much dps and you will end up with an enraged XT-002.

For me it worked best to have serependity up on 3 stacks when he starts to aoe the raid, with 3 stacks of serependity you can cast a PoH in nearly no time on one of the parties, then go on with PoM and FH and CoH if the people are not to much spread.

Links:

http://www.wowwiki.com/XT-002_Deconstructor
http://www.bosskillers.com/cgi-bin/bbguild/index.cgi?action=view_guide&g...
http://www.tankspot.com/forums/f206/48643-ulduar-xt-002-deconstructor.html