Lincoln Electric SQUARE WAVE TIG 355 Service Manual page 99

F-47
Secondary and Auxiliary
Leads
X1 to X2
X3 to X4
X5 to X6
X2 to X7
NOTE: Readings will fluctuate if line voltages are unusually high or low.
7. Check the voltages at the test points listed on
the Main Transformer Voltage Test Points
Chart.
NOTE: Readings will fluctuate if line voltages fluc-
tuate.
• If any of the secondary or auxiliary voltages is
missing or out of specification and the correct
input voltage is applied to the primary wind-
ing, the main transformer may be faulty.
TROUBLESHOOTING AND REPAIR
MAIN TRANSFORMER TEST (continued)
MAIN TRANSFORMER VOLTAGE TEST POINTS CHART
Test Point Location
Aluminum secondary leads
120VAC receptacle
Background rectifier
Aluminum secondary leads
SQUARE WAVE TIG 355
Approximate Voltages
84 to 89VAC
117 to 125VAC
22 to 24VAC
77 to 81VAC
• If all the secondary or auxiliary voltages are
low or missing and the correct input voltage is
applied to the main transformer, then the pri-
mary winding is faulty.
8. After the tests are completed and the problem
repaired, install the machine sides and top,
using the 5/16" nutdriver.
F-47