PHB, page 76, re: UMD
"Emulate Ability Score: To cast a spell from a scroll, you need a high ability score in the appropriate ability (Intelligence for wizard spells, Wisdom for divine spells, and Charisma for sorcerer or bard spells). Your effective ability score (appropriate to the class you’re emulating when you try to cast the spell from the scroll) is your result minus 15. If you already have a high enough score in the appropriate ability, you don’t need to make this check."
Since the teleportation pad is a spell completion item, you'd need either an INT, CHA or DEX of 19 (for Wizards, Sorcerers, or Psion (Nomads) respectively) to be able to complete the 'casting.' Since Lyrique has none of these stats, he'd need to get a separate UMD check of 17 (he has a 17 Cha, and needs to emulate a 19; 19-2+15=17 DC).