Lincoln Electric SQUARE WAVE TIG 355 Service Manual page 106

F-54
PROCEDURE
1. Remove input power to the machine.
2. With the 5/16" nutdriver, remove the screws and
carefully lower the case front control panel.
3. Locate the test points on the control PC board
that are called out in the Control PC Board
Voltage Test Points Chart. See Figure F.15 and
the Control PC Board Schematic.
TROUBLESHOOTING AND REPAIR
CONTROL PC BOARD TEST (continued)
FIGURE F.15 – CONTROL PC BOARD LOCATION
SQUARE WAVE TIG 355
4. Connect the DC voltmeter to the test points.
WARNING
ELECTRIC SHOCK can kill.
• With input power ON, there
are high voltages inside the
machine. Do not reach into
the machine or touch any
internal part of the machine
while power is on.
5. Turn on input power to the machine.
F-54