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F-71 F-71
INPUT CONTACTOR REMOVAL AND REPLACEMENT (continued)
FIGURE F.24 – INPUT CONTACTOR CONNECTIONS
TROUBLESHOOTING & REPAIR
PROCEDURE
1. Remove input power to the machine.
2. With the 5/16" nut driver, remove the case
top and sides.
3. Perform the Input Power Factor Capacitor
Voltage Check.
4. With the 5/16" nut driver, remove the rear
access panel.
For Steps 5-20, refer to Figure F.24.
5. With the slot head screw driver, remove the
input leads from the L1 and L2 terminals on
the input contactor.
6. With the slot head screw driver, remove the
copper strap, the heavy lead, and the small
capacitors from the output side of the con-
tactor.
.
7. Remove small lead H1 from the L1 termi-
nal.
8. Remove small lead #246 from the L2 ter-
minal.
9. Remove leads #243 and #244 from the
contactor coil tabs.
10. Remove leads #243 and #242 from the
contactor interlock located on the bottom
of the contactor.
11. With the 5/16" nut driver, remove the 4
screws mounting the contactor bracket to
the case back.
12. Carefully remove the contactor and the
bracket assembly from the case back.
SQUARE WAVE TIG 355
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