Mpu Controller Board; I/O Expander Board - Siemens 353 User Manual

Maintenance
5. Install the circuit board in the bezel by slightly inserting the top edge of board under the Fixed Retainer. The
top edge is nearest the Numeric and Alphanumeric Displays.
6. Continue to ease the board under the Fixed Retainer while lowering the bottom edge of the board into the bezel.
Be sure that the keypad connector mates with the connector on the keypad. The board is fully inserted when it
snaps under the Flexible Retainer.
7. Install the Display Assembly on the case as described above.

10.5.3 MPU Controller Board

This board has a lithium battery; refer to Section 10.2.4 Board Handling Precautions. When replacing an MPU
Controller board, configuration parameters must either be re-entered manually, read from a MultiMediaCard, or
downloaded from the PC running i|config.™ Refer to Sections 2 and 3 and to Section 11 Calibration as needed.
Factory repaired controllers must also be configured.
To replace the MPU Controller board or the station fuse use the following procedure:
REMOVAL:
1. Remove input power from Controller.
2. Remove Display Assembly as described in previous section.
3. If installed, remove the MultiMediaCard. See Figures 10-2 and 10-3.
4. Disconnect the Ethernet cable from J7 on the MPU Controller board by pressing the locking tab toward the
Controller board and withdrawing the connector from the socket.
5. Grasp the loop in the front edge of the MPU Controller board and pull the board straight out of the case.
6. Place the MPU Controller board in a static shielding bag.
INSTALLATION:
1. While wearing a grounded wrist strap, remove MPU Controller board from static shielding bag.
2. Partially insert the MPU Controller board into the case and connect the Ethernet cable.
3. Carefully guide the connector end of the board until it mates with the connector at the back of the case. Only
when the connectors are mated should additional force be applied to seat the board.
4. Disconnect wrist strap.
5. Insert a MultiMediaCard with the desired configuration into the MMC Socket.
6. Install Display Assembly as described in the previous section.

10.5.4 I/O Expander Board

REMOVAL:
1. In a hazardous area, remove input power from Controller.
2. Remove Display Assembly and MPU Controller board as described in previous sections.
3. Refer to Figure 10-5. Grasp the edge of the I/O Expander Board and pull the Board straight out of the case.
4. Place the Board in a static shielding bag.
INSTALLATION
1. While wearing a grounded wrist strap, remove the I/O Expander Board from its static shielding bag.
2. Insert the I/O Expander Board into the case and carefully guide the connector end of the board until it mates
with the connector at the back of the case. Only when the connectors are mated should additional force be
applied to seat the board.
10-12
UM353-1
April 2012