Lincoln Electric RED-D-ARC DX450 Service Manual page 136

F-92
CHOPPER MODULE REMOVAL AND REPLACEMENT (continued)
REMOVAL PROCEDURE
1. Turn the engine off.
2. Perform the Case Cover Removal Procedure.
3. Perform the Chopper Module Capacitor
Discharge procedure.
4. Disconnect leads 23 and 25 at their in-line cou-
plings.
5. Using the 7/16" socket wrench, remove the fol-
lowing leads. Label the leads before removal.
Cut cable ties as needed. Note placement of
leads and fasteners: screw, lock washer, flat
washer, small lead, an the heavy lead.
6. Using a 3/8" socket wrench, remove the three
screws holding the power module assembly to
its brackets on the vertical baffle. Remove the
plastic strip with the top two screws. Be sure to
support the Power Module as you remove the
last screw.
TROUBLESHOOTING AND REPAIR
FIGURE F.18 – MODULE LEAD LOCATIONS
B1
B2
B3
23
25
B8
B4
B5
B6
7. Remove the Power Module assembly from the
machine.
TERMINAL
B1
B2
B3
B4
B5
B6
DX450
F-92
LEADS
Heavy lead
Small lead 14
Heavy lead
Small lead 13
Heavy lead
Small lead 15
Heavy lead
Heavy lead
Heavy lead