TWO RADAR CTLRS AT LAS WORKING TFC IN THE SAME AIRSPACE RESULT IN TFC CONFLICT.

Narrative

ACFT #1 WAS ON RWY HEADING FOR BASE LEG TFC WHICH WOULD HAVE INTERFERED WITH THE DEP PROC. DEPARTED LAS RWY 25R. ACFT #2 WAS IN VFR DSCNT FROM VICINITY OF CLARR INTXN TO VGT. ACFT #2 DSNDED INTO A CONFLICT WITH ACFT #1 WHICH WAS CLBING TO 7000 FT; THEN STOPPED AT 6500 FT. ACFT #2 WAS UNDER CTL OF DAG SECTOR. ACFT #1 WAS WITH MED SECTOR (MYSELF). MED ACCEPTED AN AUTOMATED HDOF ON ACFT #2 ABOUT 25 MI SW OF LAS. ACFT #1 WAS IN DAB AIRSPACE; USING A PROC WHICH REQUIRES BOTH CTLRS TO 'QUICK-LOOK' EACH OTHER. I; THE MED CTLR; WAS DISTRACTED BY THE BASE LEG TFC AND VECTORS REQUIRED TO MISS IT. I BECAME AWARE OF THE SIT TOO LATE TO AFFECT THE LOSS OF SEPARATION. BETTER SCANNING COULD HAVE AVOIDED THE SIT. THE DAG CTLR BECAME AWARE OF THE SIT SOONER; BUT USED POOR JUDGEMENT IN ATTEMPTING CORRECTIVE ACTION. HE USED A VECTOR; WHEN ALT WOULD HAVE WORKED EASILY. AN EARLIER XFER OF COM OF ACFT #2 TO MED WOULD ALSO HAVE BEEN BENEFICIAL. SUPPLEMENTAL INFO FROM ACN 487854: I WAS XFERRING COMS ON THE LEAR; I NOTICED THE B727 WAS FURTHER W THAN NORMAL; SO I ISSUED TFC AND TURNED THE LEAR NBOUND TO AVOID THE B727; NOT REALIZING THE B727 WAS NOT FLYING THE PDR; AND SHIPPED HIM TO THE OTHER FREQ. I ASKED THE OTHER CTLR WHAT THE B727 WAS DOING AND HE REPLIED THAT HE WAS VECTORING HIM TO AVOID THE LEAR. HE WAS REFERRING TO THE OTHER INBOUND LEAR; BUT I DIDN'T KNOW THAT. I WAS UNDER THE IMPRESSION THAT HE WAS RESOLVING THE SIT. LACK OF COM WAS PROBABLY A CONTRIBUTING FACTOR.