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Its says psychers take there powers from the telepathy,biomancu etc.

Where are these powers listed in the rules or codexs?

Big rulebook, nearly at the end.

Since someone started a thread on this subject...

Is there any limitation regarding the Pyscher using his power and targeting related to:
-Psycher engaged in combat
-Target engaged in combat
-Other requirements not obvious in the written ability text

Disciplines start on page 418 (big rulebook) or 142 (small Dark Veng rulebook).

Limits on targeting are on page 67 (Declare Target), and restriction based on the type of power are on pages 68 and 69.

It seems like a Psycher can use his ability when locked in close combat, unless I am missing something...

Depends on the ability. For example, shooting attacks are only used when shooting.