Lincoln Electric 11694 Service Manual page 48

®
POWER WAVE S350
OPTIONAL USER INTERFACE BOARD TEST
PROCEDURE
1. Remove the input power to the Power Wave S350 machine.
2. Using a 5/16" nutdriver, remove the four screws securing the front
display panel, to gain access to the optional user interface board
test points. Carefully remove the optional user interface board
leaving the four pin connector in place.
3. Carefully apply the correct input power to the Power Wave S350
machine.
4. If the displays illuminate, on the front of the machine, the user
interface board is receiving the correct input voltage (40VDC).
5. See Table F.8 and Figure F.16, for the description of the LED
functions on the user interface board.
6. If the displays do not illuminate, carefully check to make sure
the user interface board is receiving the correct input supply
voltage. See Figure F.17. See the Wiring Diagram. If the supply
voltage (40VDC) is present and the user interface board does
not illuminate up, the board may be faulty. If the correct supply
voltage is not present, proceed to the next step.
7. Remove the input power to the Power Wave S350 machine.
8. Perform the Case Cover Removal and DC Link Capacitor
Discharge Procedure.
9. Using a volt/ohmmeter, check the continuity of the supply leads
(51D and 52D) between Plug J31 on the user interface board and
Plug J47 on the DC bus board. See Figure F.17. See Wiring
Diagram.
Table F.8 – Description of LED functions
OPTIONAL USER INTERFACE BOARD
LED # COLOR FUNCTION
2 RED PROCESS SELECT
3 RED WAVE CONTROL SELECT
6 RED PRE-WELD SELECT
7 RED POST-WELD SELECT
9 RED SETUP MENU ENABLED
10 RED THERMAL FAULT MEASURED
11 RED WIRE FEED SPEED SELECT
12 RED AMPS SELECT
13 RED VOLTS SELECT
14 RED TRIM SELECT
10. Using a volt/ohmmeter, check the continuity of the CAN
communication leads (153D and 154D) between Plug J31 and
Plug J11 on the power factor correction control board. See Wiring
Diagram.
11. Make sure the green ground lead is securely connected to the
user interface board. See Wiring Diagram.
12. Replace any previously removed plugs and P.C. Boards.
13. Using a 5/16" nutdriver, attach the four screws securing the front
display panel.
14. If any of the tests fail, replace the optional user interface board.
15. Perform the Case Cover Replacement Procedure.
TROUBLESHOOTING AND REPAIR
(continued)
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