Hypertherm Powermax30 Service Manual power board replacement procedure update - Manual (Page 3)

Maintenance
3-36
powermax
30 Service Manual
10. If you only have 1 screw on the snubber resistor, go to 10a (CSA serial number 30-009220 and below, CE serial
number 30-009289 and below). If you have a spring clip with 2 screws on the snubber resistor go to 10b
(CSA serial number 30-009221 and above, CE serial number 30-009290 and above).
a. Remove the 1 screw from the snubber resistor on the top of the heatsink. (CSA serial number 30-009220
and below, CE serial number 30-009289 and below.)
b. Remove the 2 screws from the spring clip on the top of the heatsink and remove the spring clip. (CSA serial
number 30-009221 and above, CE serial number 30-009290 and above.)
11. Detach the bottom 2 wires (both are white) from the ON/OFF switch.
12. Lay the unit on its side (power board down) and use a 5/16-inch (8 mm) nut driver to remove the nuts that secure
the red and the white wires that are routed underneath the board to the studs on the fan side of the unit. The studs
are labeled “RED” and “WHT.”
13. Stand up the unit again. Tuck out of the way all the wires that you detached.
14. Pull the board straight out from the power supply.
15. Before installing a new power board, clean the heatsink with isopropyl alcohol. Gently scrub away any residual
thermal compound, being careful not to scratch the heatsink. Wipe it with a clean cloth.
Snubber
resistor screw
Snubber
resistor screws
Snubber resistor
spring clip