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TROUBLESHOOTING & REPAIR
PILOT TRANSFORMER TEST (continued)
FIGURE F.7 - PILOT TRANSFORMER CONNECTIONS
X1
X2
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TEST PROCEDURE
1.Remove input power to the machine.
2.With the 5/16" nut driver, remove the machine top and sides.
3.Locate terminals X1 and X2 connected to the pilot transformer secondary. See Figure F.7.
4.Connect the volt/ohmmeter to X1 and X2.
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.
6.Check for 120 VAC at the X1 and X2 termi- nals.
•If 120 VAC is present at X1 and X2, the pilot transformer is good.
•If 120 VAC is NOT present at X1 and X2, check for the correct primary voltage at leads H1 to HX, depending on the input volt- age being applied to the machine. See the machine Wiring Diagram.
NOTE: H1 is located at L1 on the input side of CR1 input contactor.
If the correct voltage is being applied to the primary of the pilot transformer and 120 VAC is not present at terminals X1 and X2 of the sec- ondary winding, the pilot transformer may be faulty. Replace.
NOTE: The secondary voltage will vary with fluctuations in the input line voltage.
7.After the tests are completed and the prob- lem repaired, install the machine sides and top, using the 5/16" nut driver.
SQUARE WAVE TIG 355
