Hypertherm Powermax45 Field Service Bulletin page 4

Powermax45/45 XP Capacitor Replacement Kit
Replace the capacitors
1. Turn OFF the power, disconnect the power cord, and disconnect the gas supply.
2. Remove the 2 screws from the handle on the top of the power supply. Tip the end panels back slightly so that you
can get the edges of the handle out from underneath them. Lift the cover off the power supply. Remove the
component barrier that protects the power board.
Static electricity can damage circuit boards. Use proper precautions when handling printed circuit
boards.
– Store PC boards in anti-static containers.
– Wear a grounded wrist strap when handling PC boards.
3. Remove the 4 capacitor machine screws. Discard the screws.
4. From the top of the power supply, use needlenose pliers to compress and release the top 2 clips on the fan's plenum.
After you release the top clips, you can tilt the plenum away from the power supply to reach the bottom 2 clips. Lift
the plenum off the fan casing.
5. Slide both capacitors out of their slots in the center panel, away from the power board, and discard the capacitors.
6. Install the 2 new capacitors in their place, making sure their screw holes line up with the holes in the power board.
IMPORTANT: Make sure the rubber vent holes on the capacitor tops are facing down, and line up with
the vent holes in the power board.
2
Figure 1 – Capacitor machine screws in the power supply
Black wire
CAUTION!
TP 19
TP 18
TP 17
W
R
B
192 VDC
192 VDC
-
- +
+
Machine screws (4)
Powermax45/45 XP Field Service Bulletin 805950