ARR RADAR CTLR AT HNL INADVERTENTLY DSNDED AN ACR DC10 WELL BELOW THE MINIMUM VECTOR ALT (MVA).

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ACFT X INBOUND TO HONOLULU INTL ARPT. THE PROB AROSE WHEN ACFT X RPTED IN ON MY FREQ WITH THE CURRENT ATIS AT 10000 FT AND UNABLE TO HOLD SHORT. ON INITIAL CONTACT I THOUGHT I GAVE ACFT X A 230 DEG HDG AND DSNDED THE ACFT TO 8000 FT TO EXPECT THE VISUAL APCH TO RWY 8L. AFTER I REVIEWED THE TAPES I REALIZED THAT I TOLD ACFT X; TO FLY HDG 230 DEGS; DSND AND MAINTAIN 3000 FT AND TO EXPECT THE VISUAL APCH TO RWY 8L. I THEN KEPT UP MY SCAN WITH OTHER ACFT ON FREQ. WHEN I GOT BACK TO ACFT X I NOTICED HIM AT 5700 FT. I IMMEDIATELY TOLD ACFT X TO MAINTAIN 8000 FT. ACFT X SAID HE READ BACK ON INITIAL CONTACT 3000 FT. AS I WAS GIVING 'LOW ALT ALERT CHK YOUR ALT IMMEDIATELY THE MVA IN YOUR AREA IS 6000 FT' MY ASSIST WAS BRINGING UP THE MVA MAP. I LOOKED AT HIS MVA MAP QUICKLY AND THEN TOLD ACFT X THE MVA IS 4700 FT. ACFT X SAID HE WAS CLBING TO 8000 FT. AT NO TIME DID I OBSERVE ACFT X DSND BELOW 5400 FT. HOW IT WAS DISCOVERED: I NOTICED IT WAS ABOUT THE SAME TIME THE PLT DID BECAUSE HE KEYED HIS MIKE RIGHT BEFORE I DID. I THEN WAITED FOR HIM TO FINISH HIS XMISSION. I THEN INSTRUCTED HIM TO MAINTAIN 8000 FT. CORRECTIVE ACTIONS: I TOLD THE PLT TO MAINTAIN 8000 FT BECAUSE I DIDN'T WANT HIM TO DSND ANY FURTHER AND I WANTED HIM TO CLB. FACTORS AFFECTING THE QUALITY OF HUMAN PERFORMANCE: WE JUST STARTED WORKING ON THE NEW EQUIP A MONTH AGO AND THE TFC WAS OF A MODERATE FLOW. PERCEPTIONS; JUDGEMENT AND DECISIONS: THE DSCNT TO 5400 FT WAS FROM THE INADVERTENT OR UNINTENTIONAL CALL OF MYSELF FOR HUMAN ERROR. THE 3000 FT ALT COMES FROM OUR ARRS INBOUND FROM THE SE BECAUSE WE NORMALLY PUT THEM ON A 285 DEG HDG AND DSND THEM TO 3000 FT. THE ACFT WHERE ACFT X WAS AT USUALLY GET A 230 DEG HDG AND DSND TO 8000 FT.