Powermax125 Service Manual 808070 201
9 – Power Supply Component Replacement
9. Complete the following procedures:
a. See Connect the gas tube on page 189.
b. See Install the end panel bracket on page 175.
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.
Replacing the control board
Remove the control board
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 end panel bracket on page 174.
2. Remove the current adjustment knob and operating mode switch knob from the front panel by pulling them straight
off. See Figure 71 on page 202.
3. Carefully pull the top of the front panel away from the power supply. The front panel is still attached to the bottom of
the power supply and can only move a short distance.
4. Remove the 3 screws that secure the control board to the front panel. 2 screws are installed at the top of the control
board, one at each end. The third screw (not shown) is installed in the middle of the control board along the bottom
edge.
Access the third screw from the fan side of the power supply.
5. Carefully slide the control board from behind the front panel toward the power board side of the power supply.
6. Disconnect the ribbon cable from the control board.
Install the control board
1. Plug the ribbon cable into the J6 connector on the control board. See Figure 71 on page 202.
2. Carefully pull the top of the front panel away from the power supply and slide the control board into place. Angle the
bottom of the board into the correct position first, then angle the top of the board into place.
3. Secure the control board to the front panel using the 3 supplied mounting screws. Tighten the bottom screw first to
ensure the control board is aligned properly, then tighten the 2 top screws. Tighten all 3 screws to 8.1 kg-cm
(7 inch-pounds).
Kit number Description
228657 Kit: Powermax65/105/125 control board (141100)
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