Powermax125
Service Manual 808070
213
9 – Power Supply Component Replacement
Replacing the snubber resistor
1.
Complete the following procedures:
a.
Disconnect the power and gas supply
b.
c.
d.
e.
2.
Remove the 2 mounting screws from the appropriate snubber resistor. See
3.
Remove the snubber resistor from the heatsink.
4.
Clean the area where the snubber resistor was mounted using isopropyl alcohol to remove the old thermal grease
from the heatsink.
5.
Apply a 0.0762 mm (0.003 inch) layer of thermal grease, about the thickness of a sheet of paper, evenly to the
snubber resistor mounting surface.
6.
Mount the snubber resistor to the heatsink as follows by hand-tightening the 2 supplied mounting screws. (See
Kit 428137 – Align the snubber resistor so the 2 threaded studs are on the bottom of the snubber resistor.
Kit 228898 – Align the snubber resistor so the 2 threaded studs are on the left side of the snubber resistor.
7.
Step-torque the 2 mounting screws to the proper torque value as shown in
8.
Tighten the 2 supplied standoffs in the threaded holes of the snubber resistor to 11.5 kg-cm (10 inch-pounds). Verify
the standoffs are firmly seated to the resistor for a solid electrical connection.
9.
Complete the following procedures:
a.
b.
c.
d.
Install the power supply cover
e.
Reconnect the power and gas supply.
Kit number
Description
Kit: Powermax125 snubber resistor 7.5 Ω with thermal grease
Kit: Powermax105/125 snubber resistor 15 Ω with thermal grease