Lincoln Electric Precision TIG 375, Руководство по обслуживанию, Страница: 78 / 143

F-32 F-32
PRECISION TIG 375
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TROUBLESHOOTING & REPAIR
GAS (WATER) SOLENOID TEST
(continued)
TEST PROCEDURE
1. Remove input power to the Precision TIG 375
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 375.
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 supply to the sole-
noid 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 restric-
tions 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