Lincoln Electric POWER WAVE SVM135-B Service Manual page 152

F-88
INPUT RECTIFIER REMOVAL AND REPLACEMENT (continued)
FIGURE F.25 — INPUT RECTIFIER REMOVAL AND REPLACEMENT.
REMOVAL PROCEDURE
1. Remove input power to the Power
Wave 455.
2. Using the 3/8 in. nutdriver, remove the
case top, sides, and input access
panel.
3. Perform the Capacitor Discharge
Procedure.
4. Locate and remove the RTV sealant
from the input rectifier connection termi-
nals. Refer to Figure F.25.
5. Label leads and using the Phillips head
screwdriver carefully remove the five
leads from the input rectifier terminals.
Note placement for reassembly.
6. Using the 3/16 in. Allen wrench,
remove the two mounting screws and
washers from the rectifier module.
TROUBLESHOOTING AND REPAIR
POWER WAVE 455/POWER FEED 10
INPUT
RECTIFIER
A
B
C
NEG (-)
POS (+)
7. Carefully remove the module.
REPLACEMENT PROCEDURE
1. Clean heatsink surfaces.
2. Apply an even coating of joint com-
pound (Penetrox A-13) to both the
heatsink and module mounting sur-
faces. The joint compound should be
0.002 in/0.005 in. thick per surface.
3. Mount the module to the heat sink and
evenly torque the mounting screws
(with washers) to 44 in/lbs.
4. Assembly the leads to the correct mod-
ule terminals and torque to 26 in/lbs.
5. Apply RTV sealant to the rectifier con-
nection terminals.
6. Install the case top, sides, and input
access panel using the 3/8 in. nutdriver.
F-88