Lincoln Electric 11694 Service Manual page 78

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POWER WAVE S350
REMOVAL AND REPLACEMENT PROCEDURE
REMOVAL PROCEDURE
1. Remove the input power to the Power Wave S350 machine.
2. Perform the Case Cover Removal and DC Link Capacitor
Discharge Procedure.
3. Locate the switch board. See Figure F.33.
4. Label and disconnect plugs J41, J42, J43, J45 and J28 from the
switch board. See Figure F.34. See Wiring Diagram.
5. Using a 7/16" socket, label and disconnect the six output choke
leads from switch board terminals BL1, BL2, BL3, BL4, BL5 and
BL6. See Figure F.34. See Wiring Diagram.
6. Using two 7/16" open end wrenches, label and disconnect the
positive output cable from the switch board. See Figure F.34.
See Wiring Diagram. Note washer placement for reassembly.
7. Using a 7/16" socket, label and disconnect the two input choke
leads from switch board terminals B28 and B29. See Figure
F.34. See Wiring Diagram.
8. Using a 7/16" socket, label and disconnect the three input power
leads from switch board terminals B30 (lead 2A), B31 (lead 1A)
and B32 (lead 3A). See Figure F.34. See Wiring Diagram.
9. Label and disconnect leads 410 and 409 from the switch board
heatsink thermostat. See Figure F.34. See Wiring Diagram.
SWITCH BOARD
Figure F.33 – Switch board location
SWITCH BOARD
10. Using a 5/16" nutdriver, remove the four screws and washers
securing the switch board to the chassis frame. See Figure
F.35.
NOTE: It may be necessary to remove the air baffle to access the rear
11. The switch board can now be removed and replaced.
TROUBLESHOOTING AND REPAIR
(continued)
mounting screws.
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