Switch Board Assembly - Lincoln Electric POWER WAVE C300 Service Manual

F-88
SWITCH BOARD ASSEMBLY REMOVAL AND REPLACEMENT PROCEDURE
FIGURE F.33 – SWITCH BOARD LOCATION & MOUNTING SCREWS
PROCEDURE
1. Disconnect the input power to the POWER
WAVE® C300 machine.
2. To gain access to the Switch Board Assembly
see the Case Cover Removal and DC Link
Capacitor Discharge Procedure.
3. Locate the Switch Board. See Figure F.33.
4. Locate, label and remove the five molex plugs
from the switch board. J41, J42, J43, J45 and
J28. See Figure F.34.
5. Using the 7/16" wrench, remove the six output
choke leads from the terminals labeled BL1 thru
BL6. Be sure to label the leads for reassembly.
See Figure F.34.
6. Using the 7/16" wrench, remove the positive
output cable from the switch board. See Figure
F.34.
Note washer and lead placement for
reassembly.
TROUBLESHOOTING AND REPAIR
(continued)
MOUNTING SCREWS (4)
POWER WAVE® C300

SWITCH BOARD ASSEMBLY

7. Using the 7/16" wrench, remove the two input
choke leads from terminals B28 and B29. See
Figure F.34.
8. Using the 7/16" wrench, remove the three input
power leads from terminals B30 Lead 2A, B31
Lead 1A and B32 Lead 3A. See Figure F.34.
9. Remove the two thermostat leads (410 and
409) from the heat sink thermostat.
10. Using the 5/16" nutdriver, remove the four
screws and washers securing the switch board
assembly to the chassis frame. See Figure
F.33.
11. Using the 5/16" nutdriver, remove the cable
clamp from the top aluminum extrusion. Clear
all leads for Switch Board Assembly removal.
12. Carefully remove the Switch Board Assembly.
INPUT CHOKE
F-88