Maintenance 5-8
On-Site Replacements
Replacing the Printed Circuit Board (PCB)
To replace the printed circuit board, follow these steps:
1 Power off the pump.
2 Remove the back panel by unscrewing the four hex side panel screws and the two
standoff screws holding the DB-15 connector.
3 Remove the two hex screws that hold the printed circuit board to the pump.
4 Note the cable connection locations and unplug the cable from the board.
5 Plug the cables into the new board.
6 Install the new board and screw it into place.
7 Reinstall the DB-15 connector using the two standoff screws, then replace the back
panel using the four back panel screws.
8 Power on and reinitialize the pump.
Replacing the EPROM
To replace the EPROM, follow these steps:
1 Power down the pump.
2 Remove the back panel by unscrewing the four hex side panel screws and the two
standoff screws holding the DB-15 connector.
3 Remove the old EPROM by using a PROM puller. The EPROM is located in
position U8 on the printed circuit board. (See Chapter 2, “Hardware Setup.”)
4 To install the new EPROM, position the notched end of the EPROM so that it faces
the bottom of the pump. Make sure all metal pins are aligned with the holes on the
receptacle.
5 Once the pins are seated in the holes, press the EPROM firmly into place. If the two
rows of pins are too far apart to match the hole on the receptacle, gently press the
side of a complete row of pins against a table top to push the row slightly toward the
center.
NOTE Care must be taken not to bend any of the pins on the EPROM.
6 Replace the back panel and DB-15 connector.
7 Power on and reinitialize the pump.
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