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F-46F-46
PRECISION TIG 275
TROUBLESHOOTING & REPAIR
HIGH VOLTAGE TRANSFORMER
REMOVAL AND REPLACEMENT (continued)
REMOVAL PROCEDURE
1. Remove input power to the TIG 275
machine.
2. Using the 3/8” nut driver, remove the case
sides and top.
3. Using a 3/8” nut driver, remove the case
back.
Note: The case back will be connected to
the fan assembly and will have leads
connected to it, so just set aside.
4. Cut any necessary cable ties.
5. Disconnect black lead from the high voltage
transformer connecting to leads 231D and
231E.
6. Disconnect the black lead from the high
voltage transformer connecting to the
capacitor. It may be necessary to cut lead.
7. Using a 7/16” nut driver disconnect heavy
black leads S and F. See Figure F.11.
8. Using a 3/8” nut driver, remove the screw
securing the spark gap assembly box. See
Figure F.11. This will allow access to the
high voltage transformer mounting screws.
9. Using an off set phillips head screw driver,
remove the four high voltage transformer
mounting screws. Note insulator position-
ing. See Figure F.10.
10. Remove the high voltage transformer.
REPLACEMENT PROCEDURE
1. Replace the high voltage transformer.
2. Secure the new transformer using the four
phillips head mounting screws. Refer to
Figure F10 for insulator location.
3. Replace the 3/8” screw securing the spark
gap assembly box.
4. Reconnect leads S and F.
5. Reconnect high voltage transformer lead to
the capacitor.
6. Reconnect leads 231D and 231E to single
black lead.
7. Replace any necessary cable ties.
8. Secure the case back using the 3/8” mount-
ing bolts previously removed.
9. Replace the case sides and top.
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M
OUNTING SCREW
INSULATORS
HIGH VOLTAGE
TRANSFORMER
Figure F.10 - High Voltage Transformer
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