Lincoln Electric SQUARE WAVE TIG 355 Service Manual page 107

F-55
G2512-[ ]
CONTROL
PLUG J13 LOCATION
6. Check the test points for the appropriate volt-
ages. See Figure F.16.
• If the correct voltages are applied to the con-
trol PC board and the correct voltage signals
are NOT being generated by the control PC
board, the control PC board may be faulty.
TROUBLESHOOTING AND REPAIR
CONTROL PC BOARD TEST (continued)
FIGURE F.16 – CONTROL PC BOARD PLUG DETAILS
1 2 3 4 5
J13
10 9 8 7 6
SQUARE WAVE TIG 355
J12
•
• • •
RESISTOR TEST POINTS
(Control Board Area Enlarged)
• If the correct voltages are NOT being applied
to the control PC board, the power PC board
or the control transformer may be faulty.
7. After the tests are completed and the problem
repaired, install the front control panel, using
the 5/16" nutdriver.
F-55
J13 J14
• R66
R8
R32
R13
R11