Thermadyne Thermal Dynamics PAK MASTER 50XL, Service Manual

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REPLACEMENT PROCEDURES 36 Manual 0-2587
C o n n e c t io n D e sc rip t io n
E 1 4 M A I N X F M R P R I
E 1 5 X F M R P R I
E 1 6 M A I N X F M R S E C
E 1 9 X F M R S E C
4. Remove the four screws which hold the mounting
plate to the bottom chassis.
5. Carefully remove the mounting plate with the Main
Transformer Assembly from the unit.
6. Install the replacement Main Transformer Assem-
bly by reversing the above procedure (see NOTE).
NOTE
The four screws securing the mounting plate to
the chassis should have a maximum of 2 to 5 threads
protruding through the left side of the chassis.
E. Output Inductor Assembly Replacement
1. Remove the Left Side Panel per Section 5.04-B.
2. Remove the Right Side Panel per Section 5.04-C.
3. Disconnect the lead wire on terminal E7 of the Pi-
lot Output PC Board.
4. Disconnect the lead wire on terminal E17 of the top
FET/Heatsink Assembly.
5. Remove the four mounting screws securing the Out-
put Inductor Assembly to the chassis.
6. Remove the Output Inductor Assembly from the
unit.
7. Install the replacement Output Inductor Assembly
by reversing the above procedure (see NOTE).
NOTE
The four screws securing the mounting plate to
the chassis should have a maximum of 2 to 5 threads
protruding through the left side of the chassis.
F. Auxiliary Transformer Assembly
Replacement
1. Remove the Left Side Panel per Section 5.04-B.
2. Remove the Right Side Panel per Section 5.04-C.
3. Disconnect the single pin connector on the white
wire coming from the Auxiliary Transformer As-
sembly.
4. On the voltage selection panel remove the pin 13
from connectors J19 (black wire), J20 (orange wire),
and J21 (brown wire) using a pin removal tool .
5. Disconnect the secondary wires by unplugging the
J15 connector from the Logic PC Board.
6. Remove the four mounting screws securing the
Auxiliary Transformer Assembly to the chassis.
7. Remove the Auxiliary Transformer Assembly from
the unit.
8. Install the replacement Auxiliary Transformer As-
sembly by reversing the above procedure noting
the following:
• Brown wire to pin 13 of the top connector (J21)
on the voltage selection panel.
• Orange wire to pin 13 of the middle connector
(J20) on the voltage selection panel.
• Black wire to pin 13 of the lower connector (J19)
on the voltage selection panel.
G. Bulkhead Adapter Replacement
1. Remove the Right Side Panel per Section 5.04-C.
2. Remove Torch connection at the Bulkhead Adapter.
3. Disconnect the gas tube from the fitting at the end
of the Bulkhead Adapter.
4. Remove the fitting.
5. Remove the first nut from the Bulkhead Adapter.
6. Carefully remove the wire from the Bulkhead
Adapter that comes from the CD Transformer Coil.
7. Remove the second nut securing the Bulkhead
Adapter to the bulkhead.
8. Install the replacement Bulkhead Adapter by re-
versing the above procedure.