Lincoln Electric POWER WAVE SVM156-A Service Manual page 95

F-49
INPUT RECTIFIER REMOVAL AND REPLACEMENT (CONTINUED)
FIGURE F.18 – INPUT RECTIFIER REMOVAL AND REPLACEMENT
REMOVAL PROCEDURE
1. Remove input power to the Power Wave
455/R.
2. Using the 3/8" nut driver, remove the case
top, sides, and input access panel.
3. Perform the Capacitor Discharge proce-
dure.
4. Locate and remove the RTV sealant from
the input rectifier connection terminals. See
Figure F. 18.
5. Label and, using the phillips head screwdriv-
er, carefully remove the five leads from the
input rectifier terminals. Note placement for
reassembly. See Figure F.18.
6. Using the 3/16" allen wrench, remove the
two mounting screws and washers from the
rectifier module.
7. Carefully remove the input rectifier module.
TROUBLESHOOTING & REPAIR
POWER WAVE 455/R
INPUT
RECTIFIER
POS (+)
REPLACEMENT PROCEDURE
1. Clean heat sink surfaces.
2. Apply an even coating of joint compound
(Penetrox A-13) to both the heat sink and
module mounting surfaces. The joint com-
pound should be 0.002 - 0.005 in. thick per
surface.
3. Mount the module to the heat sink and even-
ly torque the mounting screws (with wash-
ers) to 44 in/lbs.
4. Assemble the leads to the correct module
terminals and torque to 26 in/lbs.
Figure F.18.
5. Apply RTV sealant to the rectifier connection
terminals.
6. Install the case top, sides, and input access
panel using the 3/8" nut driver.
F-49
C
B
A
NEG (-)
See