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Powermax45
Field Service Bulletin 805860 Revision 3
Powermax45 Control Board Replacement Kit
Replace the control board
Use the following procedure to replace the control board in all Powermax45 systems. However, be sure to use the
replacement control board in kit number 228262 for all Powermax45 systems
except
for the 480 V CSA models, which
use kit number 428098.
1. Turn OFF the power, disconnect the power cord, and disconnect the gas supply.
2. Use a #2 Phillips screwdriver to remove the 2 screws from the handle on the top of the power supply. Tip the end
panels back slightly so that you can get the edges of the handle out from underneath them. Lift the cover off the
power supply. Remove the Mylar
®
insulator that protects the power board.
3. Remove the amperage control knob by pulling it straight out from the end panel.
4. Remove the front end panel, or gently tilt it away from the base.
5. Detach the ribbon cable from the power
board at J7 (200 – 240 V CSA and 230 V
CE) or J8 (400 V CE and 480 V CSA).
6. Test the new control board before
installing it by attaching its ribbon cable to
the power board. Reconnect the power,
turn the system on, and verify that the start
LED on the control board is the only LED
illuminated. Also, the fault LEDs on the
front panel should be extinguished.
7. Disconnect the electrical power and the
ribbon cable again, and set aside the new
control board.
8. Remove the 3 retaining screws from the
old control board and lift it out of the
power supply.
9. Screw the new control board into place
with the 3 retaining screws and then
attach the ribbon cable.
10. Press the amperage control knob onto the
post. There is a flat side on the post.
Ensure that the flat side of the opening in
the knob aligns with the flat side on the
post.
11. Reposition the front end panel.
CAUTION!
Static electricity can damage circuit boards. Use proper precautions when handling printed circuit
boards.
– Store PC boards in anti-static containers.
– Wear a grounded wrist strap when handling PC boards.
Control board
Ribbon cable
