Component ReplaCement
powermax
65/85
Service Manual 6-27
Replace the control board
1. Turn OFF the power, disconnect the power cord, and disconnect the gas supply.
2. Remove the power supply cover and Mylar barrier. Refer to page 6-2 Remove and replace the power supply
cover and Mylar
®
barrier.
3. Remove the metal strap from the top of the power supply by lifting the strap straight up. The strap holds the two end
panels together.
4. Remove the adjustment knob and operating mode switch knob from the front panel by pulling them straight off.
5. Carefully pull the top of the front panel away from the body of the power supply. The front panel is still attached to
the bottom of the power supply and can only move a short distance.
Note: The figure below shows the front panel separated from the base for clarity. You can remove the two
screws in the base and separate the front panel from the base if it is easier to access the components.
6. Remove the three screws that secure the control board to the front panel using a #1 Phillips screwdriver. Two
screws are installed at the top of the control board, one at each end. The third screw is installed in the middle of the
control board along the bottom edge.
7. Carefully slide the control board from behind the front panel toward the power board side of the power supply.
8. Disconnect the ribbon cable from the control board and set aside the old control board.
Air filter
Gas fitting
Screws
Filter bowl
Gas supply hose
Pressure switch
Wire connector
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