SECTION 5: REPLACEMENT PROCEDURES 32 Manual 0-2745
9. Pull the Work Cable from the unit.
10. Install the replacement Work Cable by reversing
the above procedure.
B. Main Contactor Replacement
1. Remove the Left Side Panel per Section 5.04-B.
2. Note the orientation of all the wires and then dis-
connect the input and output wiring from the Main
Contactor Assembly.
3. Remove the two nuts and washers securing the
Main Contactor to the bottom of the unit.
4. Install the replacement Main Contactor Assembly
by reversing the above procedure.
C. Fan Replacement
1. Remove the Left Side Panel per Section 5.04-B.
2. Note the orientation of the Fan Assembly wiring
push on connectors.
3. Carefully pull the wiring connectors from the lugs
on the Fan Assembly.
4. Locate and remove the four phillips head screws
securing the Fan Assembly to the Front Panel As-
sembly.
5. Carefully pull the Fan Assembly from the Front
Panel Assembly.
6. Install the replacement Fan Assembly by reversing
the above procedure.
D. Unit Base/Front Replacement
1. Remove the Left Side Panel per Section 5.04-B.
2. Remove the Right Side Panel per Section 5.04-C.
3. Remove the Work Cable per paragraph "A' above.
4. Remove the Torch from the unit.
5. Remove the two Fan Assemblies from the Base/
Front Panel Assembly per paragraph 'C' above.
6. Remove the following hardware:
a. Two mounting nuts from Main Contactor As-
sembly.
b. Nut and wire from ground stud.
c. Bottom two screws securing Rear Panel to Base/
Front Assembly.
d. On the right side remove the two screws secur-
ing the Pilot Panel to the Base/Front Panel
Assembly.
e. On the right side remove the three nuts and
washers securing the internal chassis to the bot-
tom of the unit.
7. At the front panel remove the two screws securing
the Base/Front Panel to the internal chassis.
8. Carefully slide the internal components up, back,
and out of the Base/Front Assembly.
9. Install the replacement Base/Front Assembly by
reversing the above procedure.
5.07 Left Side Internal Component
Parts Replacement
NOTE
Refer to Section 6.06 for parts list and overall de-
tail drawing.
A. Fuse Replacement
1. Remove the Left Side Panel per Section 5.04-B.
2. Remove the Fuse from the fuse holder.
3. Replace the Fuse with 0.8A 600V fuse.
4. Reinstall the Left Side Panel.
B. Fuse Holder Replacement
1. Remove the Left Side Panel per Section 5.04-B.
2. Remove the Fuse from the holder.
3. Disconnect the two wires connected to the Fuse
Holder.
3. Remove the two small screws securing the Fuse
Holder to the chassis.
4. Install the replacement Fuse Holder by reversing
the above procedure.
C. Input PC Board Assembly Replacement
1. Remove the Left Side Panel per Section 5.04-B.
2. Remove the five screws securing the wiring to the
Input PC Board.
3. Remove the clear Input PC Board Insulator sheet.
4. Remove the two screws at 'R2' and 'G'.
5. Carefully pull the Input PC Board from the unit far
enough to disconnect the wiring connections to the
component side of the PC board.
6. Install the replacement Input PC Board by revers-
ing the above procedure noting the following:
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