MK Products CobraMig 260 PS/Feeder - Manual (Page 31)

CobraMig 260 Owner's Manual - Page 25
FLOW CHART
SYMPTOM
WIRE FEEDS AT ONE SPEED ONLY, NO CONTROL BY POT SETTING ON
TORCH
NOTES:
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.
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.
6 6
START
YES NO
TORCH POT IS DEFECTIVE
OR
TORCH CABLE IS DEFECTIVE
COBRA MAIN P.C. BOARD
IS DEFECTIVE
PROBLEM AREA
TORCH MOTOR POTENIOMETER OR CABLE OR COBRA I MAIN BOARD
WAS METER READING OK ?
CHECK THE "W' CLOCKED /
"S" CLOCKED POTENIOMETER
PER NOTE BELOW
UNPLUG TORCH AMPHENOL
FROM COBRA FRONT PANEL