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F-32F-32
PRECISION TIG 275
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TROUBLESHOOTING & REPAIR
GAS (WATER) SOLENOID TEST (continued)
TEST PROCEDURE
1. Remove input power to the Precision TIG
275 machine.
2. Remove the left case side.
3. Perform the High Frequency Circuit
Disable Procedure.
4. Locate the gas solenoid in the torch connec-
tion box.
5. Put the mode switch S3 in the 2-Step TIG
position.
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.
6. Apply the correct input power to the TIG 275.
7. Activate the torch trigger and check for
approximately 115 VAC at the solenoid leads
(#231A and # 235). If the correct voltage is
present, the solenoid should activate and
gas should flow.
8. If voltage is present at leads #231A and
#235 and the solenoid does not activate, the
solenoid may be defective. The solenoid
can be further checked by removing leads
#231A and #235 from the solenoid and
applying the external isolated 115 VAC sup-
ply to the solenoid terminals. If the solenoid
activates with the external supply but not
when powered by the control board, the
problem may be in the control board. If you
hear solenoid activation but there is still no
gas flow, check for restrictions in the line.
9. When the test is complete, replace leads
#231A and #235.
10. Reassemble the two leads previously
removed in the High Frequency Circuit
Disable Procedure.
11. Reassemble the left case side.
12. If a water solenoid is used, it can be tested
using the same procedures.
WARNING