MK Products Cobramatic II - Manual (Page 20)

Cobramatic ® II Owner's Manual - Page 13
TROUBLESHOOTING GUIDE
Trouble Cause Remedy
No wire feed at torch, feeder
not operating, i.e. no slave motor or
brake solenoid.
F3 (2 amp) fuse in feeder blown. Check 115 VAC circuit. Replace fuse.
Micro-switch defective/not being
activated. Broken electrical cable. Replace switch. Check switch for
operation. Check micro-switch wires for
continuity.
Loose J13, PC board connector Check J13 connector.
Brake Solenoid inoperative
Solenoid defective Replace
Main PC board defective
Check for D31 LED operation/replace
board.
No wire feed at torch, feeder operating
properly.
Switch 1 on Main PC board in wrong
position. Select cabinet, torch or remote
position.
Bad Speed control/PCB Check/replace Main PC board
Broken electrical cable
Check motor and potentiometer wires
for continuity.
Bad torch motor (D39 LED “ON”) Check/replace motor.
Bad Potentiometer Check potentiometer with ohm meter.
Wire feeds, but welding wire is not
energized.
Loose or no cable connections Check all power connections
Relay K1 not sending contactor signal. Check/replace relay K1.
Contactor control cable loose or in
wrong position.
Check power supply owners manual for
location and type of contactor signal
required, I.e.; closing or 115VAC.
Welding power source Check power source for operation.
Wire feeds erratically.
Excessive spool drag pressure
Decrease spool drag pressure inside
hub.
Dirty or worn conduit. Blow out or replace conduit
Incorrect pressure on drive rolls.
Adjust pressure at both feeder and
torch.
Idler roll stuck
Check for lock washer under idler roll,
or replace if damaged.
Wrong size contact tip See contact tip table in torch manual.
Wire feeds one speed only.
Bad potentiometer. Check with meter.
Broken electrical cable.
Check potentiometer wires for
continuity or short.
Bad speed control. Check/replace Main PC board.
Wire walks out of drive rolls.
Idler roll upside-down. Place groove in idler roll toward top.
Rear wire guide missing. Replace wire guide.