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Replacement Of The
Main Logic Board
NOTE
Technical Support:
Subject to change without prior notice.
QLSiemens AG 1999
After making sure no voltage is present, take the following steps:
1
Remove the four screws holding the cover plate.
2
Remove the cover plate.
3
The Logic Board to be replaced is on the right; it is the board with the
adjustment potentiometers and LED light.
Before you disconnect the control wires from the Logic Board terminal strip, make sure you
record the wire marker numbers and locations. Reconnect these wires to the same terminals
on the new board. This board is held with one screw and grooves in the card guide.
4
Remove the screw holding the Logic Board in place.
5
Slowly slide the board out of the unit to a point where you can see the red
wires that are attached to the board with push-on terminals. These wires power
the fan. Disconnect these wires, tagging them, so that they will go on the
same terminals on the new board.
6
Disconnect the ribbon connector from the board, noting which receptacle it
came from so that you can replace it in the same receptacle on the new board.
7
Slide the new board part of the way into the grooves of the card guide. The
board must be correctly placed into the appropriate groove.
8
Connect the tagged red wires to their appropriate terminals on the board.
9
After connecting the red wires, continue to slide the board until it bottoms out.
10
Reconnect the ribbon to the terminal - make sure it is firmly in place. (Some
models will have three ribbon connectors.)
11
Reconnect the control wires to the correct position on the terminal strip.
12
Secure the board with the holding screw.
13
Replace the cover before energizing controller.
14
Re-energize the controller.
Tel: ++49 (0) 9131-7-43833 (8°°-17°° MEZ)
E-mail: NST.technical-support@erl17 .siemens.de
Fax: ++49 (0) 9131-7-42899
Internet: www.ad.siemens.de/support
Order No.: 3ZX1012-0RW34-3AN1
Printed in the United States
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