Troubleshooting & repair – Lincoln Electric COMMANDER SVM145-B User Manual
Page 148
TROUBLESHOOTING & REPAIR
F-92
F-92
COMMANDER 300
POWER MODULE (CHOPPER) PC BOARD
REMOVAL AND REPLACEMENT
(continued)
FIGURE F.42 – POWER MODULE PC BOARD
COPPER STANDOFF
POWER MODULE
PC BOARD
CAPACITOR
TERMINALS
TEST PROCEDURE
1.
Turn the engine off.
2.
Remove the front right or left case side,
depending on which power module PC board
you are removing.
3.
Perform the Capacitor Discharge
Procedure.
4.
Perform the Output Panel Removal
Procedure.
5.
With the 3/8" allen wrench, remove the top
and bottom cap screws from the power mod-
ule PC board. See Figure F.42.
6.
With the 7/16" wrench, remove the three
bolts, lock washers, and flat washers from
the power module PC board.
NOTE: The top, long, bolt has a copper standoff
on the opposite side of the board. Be sure to
place this standoff between the heat sink and the
PC board at reassembly.
7.
Remove the nuts and flat washers from the
capacitor terminals and remove the flat
leads.
8.
Remove the power module board.
REPLACEMENT PROCEDURE
1.
Apply Penetrox A-13 joint compound to the
surface of the heat sink where the power
module PC board mounts.
2.
Install the three bolts, lock washers, and flat
washers to mount the power module PC
board to the heat sink.
IMPORTANT: The top, long, bolt has a copper
standoff on the opposite side of the board. Be
sure to place this standoff between the heat sink
and the PC board.
3.
Install the top and bottom allen head cap
screws. Torque the screws to 50-60 inch-
pounds.
4.
Install the leads, flat washers, and nuts to the
capacitor. Torque the nuts to 50-60 inch-
pounds.
5.
Perform the Output Panel Replacement
Procedure.
6.
Install the case side(s).