CIGWELD TRANSTIG 300 AC/DC, Руководство по обслуживанию, Страница: 77 / 134

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ADVANCED TROUBLESHOOTING
b. Verify the no-load voltage (OCV) in High Fre-
quency TIG mode.
WARNING
This welding mode produces high frequency and
high voltage. Extra care shall be taken to prevent
electric shock.
1) When in HF TIG mode, the unit will gener-
ate high voltage. To prevent personal harm
and test equipment damage, mark and
then remove the indicated wire from the HF
UNIT1 shown in Figure 11-18. To prevent
electric shock, always wrap the removed
wire with electrical tape or other suitable
insulation.
Figure 1
3
-18: Removal and installation
from the HF UNIT1
(To disable the operation of the HF unit.)
2) Press the Welding mode selection button
to select HF TIG welding mode.
3) While depressing the Torch switch, verify
the OCV using a DC voltmeter. (The capa-
bility of the voltmeter should be more than
100VDC.) The check point with a tester is
the voltage between output te and
-. In TIG mode, the OCV ceases 3 seconds
after you depress the torch switch.
4) The normal no-load voltage is approxi-
mately 65V.
5) Return the setting variable resister (VR1)
to the original position. (Return to the posi-
tion recorded by "a. 1)" clause.)
•
fully clockwise: VRD ON
•
fully counterclockwise: VRD OFF
6) Return connection with HF UNIT1 to the
original position.
HF. UNIT1
June 30, 2008 13-17
SERVICE MANUAL TRANSTIG 300 AC/DC