TRACON CTLR WORKING COMBINED APCH AND DEP CTL POS DSNDED A CPR JET THROUGH THE ALT OF AN ACR B737 WITH LTSS. TRACON WAS USING CENRAP AT THE TIME AS THE ASR WAS OTS FOR MAINT.

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MORNING OF OCCURRENCE THE FACILITY PRIMARY RADAR WAS OTS FOR MAINT. I WAS WORKING WITH A BACKUP SYS THAT PROVIDES DATA; IE; ALT READOUTS EVERY 12 SECONDS; WHEN NORMALLY I RECEIVE DATA EVERY 3-4 SECONDS. #1 ACFT WAS A B737 DEPARTING ARPT; HDG SWBOUND CLBING TO 8000 FT ON FREQ. #2 ACFT WAS HANDED OFF TO ME AT 12000 FT DSNDING TO 9000 FT SSEBOUND; OFF FREQ. THIS ACFT WAS NOT AT THE CORRECT ALT OR POS ACCORDING TO OUR LOA WE HAVE WITH OTHER FACILITIES. I WAS NOT SURE EXACTLY WHAT PREVIOUS CTLR HDG WAS GIVEN TO SECOND ACFT. IT APPEARS TO BE SSEBOUND. MY PLAN WAS TO PASS TO THE N OF DSNDING ACFT. I TURNED ACFT #1 WBOUND AND ISSUED TFC. ON FIRST CALL FROM ACFT #2 I ISSUED DSCNT CLRNC WITH A RESTR TO DSND TO 7000 FT; LEAVING 8000 FT; TURN L HDG 100 DEGS. BOTH ACFT WERE ABOUT 15 MI APART AT THIS TIME. AFTER OBSERVING THIS PLAN WAS NOT WORKING; I TURNED ACFT #1 40 DEGS TO THE N AND STOPPED DSCNT OF ACFT #2 AND INSTRUCTED ACFT #2 TO CLB BACK UP TO 9000 FT. AT THIS TIME ACFT WERE ABOUT 5 MI APART. MY DATA BLOCK THEN SHOWED #2 ACFT AT 8400 FT. I INSTRUCTED ACFT #2 TO EXPEDITE CLB TO WHICH HE REPLIED LEVEL OF 9000 FT. ACFT #2 ALSO RPTED #1 IN SIGHT. DUE TO THE FACT THAT I WAS UNSURE OF HDG ISSUED BY PREVIOUS CTLR AND THAT I WAS UNFAMILIAR WITH THE BACKUP SYS; I MIGHT HAVE LOST NEEDED SEPARATION. DURING USE OF BACKUP SYS OUR STANDARD SEPARATION IS INCREASED BY 2 MORE MI PER ACFT. NO EVASIVE ACTION WAS TAKEN BY EITHER ACFT. SUGGESTION ON PREVENTING OCCURRENCE: DO RADAR MAINT DURING OFF PERIODS. GET A DSCNT BACKUP SYS.