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TROUBLESHOOTING & REPAIR
TRIGGER CIRCUIT TEST (continued)
FIGURE F.9 – SIMPLIFIED TRIGGER CIRCUIT DIAGRAM (Later Versions)
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PROCEDURE
1.Remove input power to the
2.Perform the Input Filter Capacitor Discharge Procedure detailed earlier in this section.
3.Locate the torch cable receptacle and leads #2 and #4. See Figure F.9, the Simplified Trigger Circuit Diagram. These leads are best accessed at plug J31 on the output board. See Figure F.10.
4.Using the ohmmeter, check for continuity (less than one ohm) from lead #2 to lead #4. The torch trigger must be pulled and all input power removed from the machine. If conti- nuity (less than one ohm) is not read, check the leads from plug J31 to the torch cable receptacle. Perform the Torch Continuity and Solenoid Test.
5.If less than one ohm is read (only when the torch trigger is pulled), proceed to the next step. Also see Output Board LED Definitions and related figures.
6.Apply the correct input power to the
7.If the correct voltage is present in Step 6, carefully check for the presence of approxi- mately 15 VDC from plug J32
Test.
8.If the correct voltage is present in the above test, carefully pull the torch trigger.
WARNING
PILOT ARC, CUTTING ARC, AND HIGH VOLT-
AGE MAY BE PRESENT AT THE TORCH HEAD. Perform this test with the air input removed to avoid a pilot arc at the torch.
