MK Products CobraMig 260 PS/Feeder - Manual (Page 30)

CobraMig 260 Owner's Manual - Page 24
FLOW CHART
1. Check TORCH POT at plug connector
a. Testing the poteniometer - "W"
Clocked. - Using Ohm Meter to check
resistance across pin "D" (wiper) and pin
"C" of Torch plug. Should vary from 0 to
5k ohm while turning pot. - Using Ohm Meter
to check resistance across pin "D"
(wiper) and pin "G" of Torch plug.
Should vary from 0 to 5k ohm while
turning pot.
5 5
SYMPTOM
NO WIRE FEED AT TORCH, FEEDER OPERATING PROPERLY
PROBLEM AREA
COBRA MAIN BOARD, TORCH POT OR TORCH MOTOR
b. Testing the poteniometer - "S"
Clocked. - Using Ohm Meter to
check resistance across pin "D"
(wiper) and pin "C" of Torch plug.
Should vary from 0 to 5k ohm while
turning pot.- Using Ohm Meter to
check resistance across pin "D"
(wiper) and pin "A" of Torch plug.
Should vary from 0 to 5k ohm while
turning pot.
2. Check TORCH MOTOR
a. Unplug the Torch from the front panel.
b. Using the Ohm Meter, Check the
resistance across pin "A" and pin "B"
(motor leads) of Torch plug. The resis-
tance should be about 5 to 10 ohms.
c. If open of short circuit exists, then check
motor leads and motor for additional prob-
lems.
NO YES
START
NO
YES
CHECK TORCH MOTOR
(SEE NOTE 2 BELOW)
YES
NO
YES
CABLE IS BROKEN
OR
TORCH POT IS DEFECTIVE
NO
NOTES:
WAS METER READING OK ?
CABLE IS BROKEN
OR
TORCH MOTOR IS DEFECTIVE
COBRA MAIN BOARD
IS DEFECTIVE
WAS METER READING OK ?
CHECK TORCH POT
(SEE NOTE 1 BELOW) SYSTEM OK
IS THE TORCH WORKING
OK NOW ?
GO TO FLOW CHART #3
COBRA I MAIN BOARD,
F1 FUSE IS BLOWN CHECK FOR LOOSE CABLES
AT COBRA FRONT PANEL AND
MAIN P.C. BOARD
IS COBRA MAIN
BOARD F1 FUSE OK?