Component ReplaCement
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Service Manual 6-17
Replace the power 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 the power supply cover and Mylar
barrier.
3. Remove the metal strap at the top of the power supply and pull the front panel out slightly to make it easier to
access the power board.
Remove the DSP board
1. Disconnect the DSP connector (1) from the top of the DSP board (3).
Note: This step is only required on systems that have an RS485 communication board installed. Systems
without an RS485 communication board installed will not have a connector plugged into the top of the
DSP board.
2. Use a #2 Phillips screwdriver to remove the 2 screws (2) from the DSP board.
Two rows of connector pins (4) are located on the back of the DSP board (3) as shown in the figures below. The
dashed rectangle identifies the location of the pins on the back of the board.
3. Carefully pull the DSP board (3) straight out from the power board (5). Do not bend the pins.
Note: Instructions for removing the DSP board are the same for both CE and CSA models. The power board (5)
shown below is a CSA model.
4. Disconnect the ribbon cable from the ribbon cable connector (6) on the back of the DSP board. Set the DSP board
aside.
For CE systems, proceed to page 6-19 Replace the power board (380/400V CE).
For CSA systems, proceed to page 6-22 Replace the power board (200 – 600V CSA).
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