MK Products CobraMig 260 PS/Feeder - Manual (Page 36)

CobraMig 260 Owner's Manual - Page 30
FLOW CHART
PROBLEM AREA
POWER SUPPLY CONTROL BOARD, K2 RELAY MAIN BOARD, TRIAC
SYMPTOM
CONTACTOR CLOSED, WIRE ALWAYS ENERGIZED
11
START
YES NO
YES NO NO YES
PSCB IS DEFECTIVE TRANSFORMER
RELAY IS
DEFECTIVE OR NO
AC INPUT, CHECK
DISCONNECT FUSE
REMOVE JUMPER
FROM TP1:TP5
DISCONNECT J6 ON PSCB
YES NO
YES NO
PSCB IS DEFECTIVE
CLOSED SIGNAL
YES NO
RESEAT K2 RELAY
REPLACE IF
NECESSARY
YES NO
11
IS PSCB LED D7 ON?
JUMP TP1 TO TP5
IS PSCB LED D12 ON? IS PSCB FUSE F1 OK?
PSCB IS DEFECTIVE
CONTACTOR STILL CLOSED?
IS THE WELDING
VOLTAGE
CONTROLLABLE?
DISCONNECT J5
ON THE PSCB
USING OHMMETER,
CHECK FOR
CONTINUITY ACROSS
J6-3 AND J6-4 ON
MAIN PC BOARD
PSCB IS DEFECTIVE
IS THE WELDING
WIRE STILL
ENERGIZED?
REPLACE TRIAC PSCB IS DEFECTIVE