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WARNING
ELECTRIC SHOCK can kill.
With input power ON, there are high voltages inside the machine, including the pro- tection board. Do not reach
into the machine or touch any internal part.
10.Turn input power ON.
11.Turn the knob on the Remote Control Kit all the way counterclockwise.
12.With the volt/ohmmeter, check the voltage between plug J10 - pin 6 (positive) and J10 - pin 7 (negative) on the display board. It should be about zero volts.
13.With the Power Wave set in the SMAW (CC) mode of operation, turn the knob on the Remote Control Kit clockwise. The voltage between plug J10 - pin 6 and J10 - pin 7 should increase smoothly to about 10.25 volts. If this happens but the dis- play shows no change in the preset cur- rent value (SET = ), replace the display board. If the voltage between pins 6 and 7 does not increase smoothly, test the asso- ciated wiring as follows:
A.Turn power switch SW1 to the OFF posi- tion and disconnect input power to the machine.
B.Perform the Capacitor Discharge Proce- dure described earlier in this section of the manual.
WARNING
Before continuing with the test procedure, per- form the capacitor discharge procedure to avoid electric shock.
A.No continuity between J10 - pin 10 and P1 - pin A (of the remote amphenol):
•Check lead #177A between the remote amphenol and the square wave TIG pro- tection board for continuity.
•Check lead #294 between the square wave TIG protection board and the dis- play board for continuity.
•Check plugs J10, J92, and J93 to make sure the pins are seated properly and not opened up or loose.
•Replace the square wave TIG protection board.
B.No continuity between J10 - pin 6 and P1 - pin B (of the remote amphenol)
•Check lead #176A between the remote amphenol and the square wave TIG pro- tection board for continuity.
•Check lead #291 between the square wave TIG protection board and the dis- play board for continuity.
•Check plugs J10, J92, and J93 to make sure the pins are seated properly and not opened up or loose.
•Replace the square wave TIG protection board.
C.No continuity between J10 - pin 7 and P1 - pin C (of the remote amphenol)
•Check lead #175A between the remote amphenol and the square wave TIG pro- tection board for continuity.
•Check lead #292 between the square wave TIG protection board and the dis- play board for continuity.
•Check plugs J10, J92, and J93 to make sure the pins are seated properly and not opened up or loose.
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C.Remove plug J10 from the display board. Check for continuity between the following pins:
J10 - pin 10 and P1 - pin A (of the remote amphenol)
J10 - pin 6 and P1 - pin B (of the remote amphenol)
J10 - pin 7 and P1 - pin C (of the remote amphenol)
14.If you find no continuity between any of these pins, do the following:
•Replace the square wave TIG protection board.
15.Connect all the plugs disconnected for the tests above.
16.Connect plug J30 into the protection board and replace the PC board cover with two sheet metal screws.
17.Connect the five leads to the main con- tactor.
18.Install the machine case sides and top.
19.Install the handle and the lift bail rubber gasket.
