User Interface Board - Lincoln Electric POWER WAVE C300 Service Manual

F-96
USER INTERFACE BOARD REMOVAL AND REPLACEMENT PROCEDURE
PROCEDURE
1. Disconnect the input power to the POWER
WAVE® C300 machine.
2. To gain access to the User Interface Board see
the Case Cover Removal and DC Link
Capacitor Discharge Procedure.
3. Locate the User Interface Board. See Figure
F.36.
4. Using the small screwdriver remove the three
knobs and felt washers from the case front.
See Figure F.37.
5. Using the 5/16 inch wrench remove the four
screws from the top of the case front assembly.
See Figure F.37.
6. Using the 5/16 inch wrench remove the two
screws from the User Interface Board cover
plate. See Figure F.38.
7. Using the 3/8 inch wrench remove the two
nuts, lock washers and washers from the inter-
face cover plate. See Figure F.38.
8. Remove the cover plate and locate the two slot
head screws securing the User Interface Board
to the case front assembly.
9. Using the slot head screwdriver remove the
two mounting screws from the User Interface
Board.
10. Remove the Power Factor Correction Control
Board. See the Power Factor Correction
Control Board Removal and Replacement
Procedure.
11. Remove Plug J5 from the User Interface
Board.
TROUBLESHOOTING AND REPAIR
(continued)
POWER WAVE® C300
12. Remove the bypass grounding assembly from
the User Interface Board.
13. Locate and remove the other two slot head
mounting screws on the left hand side of the

User Interface Board.

14. Carefully remove the User Interface Board
from the case front panel assembly.
REPLACEMENT PROCEDURE
15. Carefully place the new User Interface Board
into position in the case front assembly.
16. Secure the User Interface Board to the case
front with the four slot head screws previously
removed.
17. Connect the bypass grounding assembly.
18. Connect plug J5.
19. Install the Power Factor Correction Control
Board that was previously removed.
20. Replace the User Interface Board cover plate.
21. Replace the three knobs and felt washers.
22. Replace the four screws that were removed
from the top of the front cover assembly.
23. Replace the case cover. See the Case Cover
Removal and DC Link Capacitor Discharge
Procedure.
24. Perform the Retest After Repair Procedure.
F-96