flow chart - MK Products

9 FLOW CHART 9SYMPTOMPOSA START NO WORKING PROPERLYPROBLEM AREACURRENT SENSOR, COBRA I MAIN BOARD, READ POSA START SECTION.STARTTO CHECK POSA START POT :REMOVE J2 ON COBRA I MAIN BOARD, TURN ON POSA START SWITCHUSING OHM METER METER RESISTANCE AT J2-1 AND J2-2 RIBBON CABLEREADING SHOULD VARY FROM 0 TO 100K OHMNOIS READING OK ?YESPOSA START POT ORPOSA START SWITCH DEFECTIVEPLUG IN J2REMOVE J1 ON COBRA I MAIN BOARD.USING OHM METER MEASURE RESISTANCE OFCURRENT SENSORTHE READING SHOULD BE OPENNOIS READING OK ?YESCURRENT SENSOR IS DEFECTIVE(CLOSED ALL THE TIME)USING A VOLT METER, MEASURE THE WELD VOLTAGEAT J6-2(-) AND J6-1(+) ON COBRA I MAIN BOARDSET POSA POT = 1/4 TURN ONSET TORCH POT = MAXIMUM (CW)TURN ON COBRAMIG 260TRIGGER AND ADJUST WELD VOLTS TO APPROX 15VJUMPER J1-1 AND J1-2 ON COBRA 1 MAIN BOARDNODOES TORCH MOTOR SPEEDINCREASE WHEN JUMPER ISADDED?YESCOBRA I MAIN BOARDIS DEFECTIVECURRENT SENSOR IS DEFECTIVE(OPEN ALL THE TIME)CobraMig 260 Owner's Manual - Page 28