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F-29 F-29
INPUT CONTACTOR TEST (continued)
FIGURE F.5 - INPUT CONTACTOR TEST POINTS
TROUBLESHOOTING & REPAIR
TEST PROCEDURE
1. Remove input power to the machine.
2. With the 5/16" nut driver, remove the
machine top and sides.
3. Locate the two leads, #243 and #244, con-
nected to the input contactor coil. See
Figure F5.
4. Connect the volt/ohmmeter to the leads.
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.
ELECTRICAL ARCING can injure.
• Never mechanically close the contactor with
input power (line voltage) applied and the
machine contactor cover removed.
5. Turn on input power to the machine and
press the Start button.
6. Check for 120 VAC at the contactor coil
leads.
• If 120 VAC is NOT present when the Start
button is pressed, check the normally
closed (NC) secondary thermostat, the
power Start/Stop pushbutton and associat-
ed circuitry. See Figure F.6, Input Contactor
(CR1) Simplified Control Circuit. Also per-
form the Pilot Transformer Test.
• If 120 VAC is present and the contactor does
not activate, the input contactor is faulty.
Replace.
SQUARE WAVE TIG 355
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WARNING
WARNING
243
244