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LF-72/74
TROUBLESHOOTING AND REPAIR
F-21 F-21
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RETEST AFTER REPAIR
Retest a machine:
• If it is rejected under test for any reason that requires you to remove any part which
could affect the machine’s electrical characteristics.
OR
• If you repair or replace any electrical components.
SET UP
1. Connect a supply of filtered compressed air at 80 psi to the gas inlet.
2. Supply 42VAC to the machine.
3. Connect the gun to the connector block.
OPERATION VERIFICATION
1. Close the idle arms and the pressure arms.
2. Activate the cold feed switch.
3. Verify the drive rolls are spinning in the forward direction.
4. Adjust the wire speed knob from min to max and verify the speed is changing.
5. Release the cold feed switch and verify that the drive rolls stop abruptly.
6. Activate the gas purge switch and verify that there is gas flow.
7. Release the gas purge switch and verify the gas flow stops.
8. Place the 2-step/trigger interlock switch in the trigger interlock position.
9. Activate the gun trigger and verify the drive rolls spin.
10. Release the gun trigger and verify the drive rolls continue to spin.
11. Activate and release the gun trigger and verify the drive rolls stop abruptly.
12. Place the 2-step/trigger interlock switch in the 2-step position.