Firepower, a Thermadyne Company FIREPOWER FP-82 - Manual (Page 43)

Manual 0-2871 5-11 REPAIRS & REPLACEMENT PROCEDURES
E. Output Power PC Board Replacement
Follow the antistatic procedures in subsection 5.02.
NOTE
Follow the electrostatic discharge instructions pro-
vided with the replacement component to prevent
damage to the component.
1. Remove cover per subsection 5.04-A.
2. Locate the Power Output PC Board, mounted to
the Heatsink Shroud.
3. Carefully remove all wire connections to the Out-
put Diodes.
4. Straighten the Output Diode wires to be perpen-
dicular to the Output Power PC Board.
5. Label, then disconnect all other wire connections
to the Output Power PC Board. Refer to Appen-
dix pages for wiring connection layout.
6. Remove the bolts at the top left and bottom right
corners of the Output Power PC Board.
A-03166
Screw Locations
7. Lift the Output Power PC Board off its supports,
and set aside.
8. Install the replacement Output Power PC Board
by reversing the above steps.
F. Pilot Control Relay Replacement
1. Remove the Power Supply cover per section
5.04-A.
2. Push the clip on the front of the Heatsink Shroud
to the left to release the Solenoid Assembly. Dis-
lodge the Solenoid from underneath the clip on
the top of the Heatsink Shroud.
3. Label, then disconnect the wires connected to the
Relay.
4. Remove the two standoff nuts which fasten the
Relay to the center chassis.
5. Pull the Relay and its dust cover away from the
center chassis and out of the Power Supply.
6. Position the replacement Relay in the dust cover,
and position both on the studs fastened to the cen-
ter chassis.
7. Put an internal star washer on each stud.
8. Fasten the Relay in position with the standoff nuts.
CAUTION
Be careful that the tool does not get wedged be-
tween the standoff nut and the plastic area around
the standoff nut. Damage may occur if the tool is
pried against this area.
Relay
Dust Cover
Star Washers
Standoff Nuts
A-03177
9. Reconnect the wires removed in Step 3.
10. Return the Pressure Switch/Solenoid Assembly to
its position on the top of the Heatsink Shroud.
Slide the right edge of its base into the slot, and
secure the assembly in place with the clip.
11. Re-install the Power Supply Cover.