210 Powermax125 Service Manual 808070
9 – Power Supply Component Replacement
Replacing the output diode bridge
1. Complete the following procedures:
a. See Disconnect the power and gas supply on page 166.
b. See Remove the power supply cover on page 172.
c. See Remove the component barrier on page 173.
d. See Remove the DSP board on page 203.
e. See Remove the power board on page 205.
2. Disconnect the 2 wires on the left side of the output diode bridge. See Figure 76 on page 215.
3. Remove the 4 mounting screws from the output diode bridge.
4. Remove the output diode bridge from the heatsink.
5. Clean the area where the output diode bridge was mounted, using isopropyl alcohol to remove the old thermal
grease from the heatsink.
6. Apply a 0.0762 mm (0.003 inch) layer of thermal grease, about the thickness of a sheet of paper, evenly to the output
diode bridge mounting surface.
7. Mount the output diode bridge to the heatsink by hand-tightening the 4 supplied mounting screws.
8. Step-torque the 4 mounting screws in a diagonal sequence to the proper torque value as shown in Figure 76 on
page 215.
9. Reconnect the 2 wires to the left side of the output diode bridge.
10. Complete the following procedures:
a. See Install the power board on page 206.
b. See Install the DSP board on page 203.
c. See Install the component barrier on page 173.
d. See Install the power supply cover on page 172.
e. Reconnect the power and gas supply.
Kit number Description
428139 Kit: Powermax125 output diode with thermal grease
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