Lincoln Electric COMMANDER 400 SVM133-B Service Manual page 112

F-58
TEST PROCEDURE
NOTE: In this test procedure, the positive output
stud is used for common.
1. Using the 5/16" nut driver, open the control panel
and tilt out. Remove the control board cover.
Start the machine.
WARNING
There are high voltages present inside
the control box while the machine is
running. THE VOLTAGES ARE HIGH
ENOUGH TO KILL. Use extreme cau-
tion to avoid the backside of the
receptacles, breakers, and terminal
strip while checking voltages inside the control
box.
Range Switch Position
CV tap
90 tap
120 tap
180 tap
230 tap
270 tap
400 tap
50-575 tap
TROUBLESHOOTING AND REPAIR
RANGE SWITCH TEST (continued)
Table F.1
COMMANDER 400
2. Put the range switch in the CV position on stick &
wire machines, or in the 90 tap on stick only
machines.
3. Check the voltage at the control board from J7
pin 10 to common at each tap on the range
switch. See Figure F.28. See table F.1 below for
approximate voltage reading from each tap.
4. If any of the voltages in the table are incorrect,
replace the range switch.
5. If the test is complete, replace the control board
cover and close the control panel.
Voltage
.580 Vdc (if so equipped)
.937 Vdc
1.29 Vdc
1.65 Vdc
2.00 Vdc
2.36 Vdc
2.69 Vdc
3.06 Vdc
F-58