YOKOGAWA DTSXL, User Manual, Page: 271 / 289

< PART – C Operation and Maintenance >
C-18
IM 39J06B40-01EN 14th Edition: May 30, 2022

Replacing Optical Switch Modules
Follow the procedure below to replace an Optical Switch module
1. If the Optical Switch module is running, stop its operation. Shut down the Optical
Switch module using its SHUTDOWN switch.
If a CPU module is installed, shut down the CPU module in accordance with its
replacement procedure.
2. Turn off the power.
3. Remove the sensor optical fiber. Replace the dust protective cap of the optical
output connector after removing the cable.
4. Remove the Optical Switch module from the Base module.
5. Attach the new Optical Switch module to the Base module.
Attach the DTSX3000 first before attaching an optical switch module.
6. Connect the sensor optical fiber.
7. Turn on the power.
If a CPU module is installed, reboot the CPU module in accordance with its
replacement procedure.

Replacing CPU Module
Follow the procedure below to replace a CPU module.
1. Save retentive data to the on-board Flash Memory.
2. Backup system files using the backup command.
3. If the CPU is powered on, use the SHUTDOWN switch to turn it off.
Shut down the DTSX3000.
4. Turn off the power.
5. Remove the control network cable.
6. Remove the MIL connector cable.
7. Remove the CPU module from the Base module.
8. Install the new CPU module in the Base module and connect the control network
cable.
9. Re-connect the MIL connector cable that was removed.
10. Power on and boot up the CPU module in maintenance mode.
11. Restore backup files using the Restore command.
12. Reboot and start up the CPU module in online mode.
CAUTION
After a hardware failure, data stored on the on-board flash memory can not be retrieved.
It is recommended to backup retentive data and system files. For the backup and
restore procedure, refer to FCN-RTU manual.
SEE ALSO
For the backup and restore procedure, refer to FCN-RTU manual (IM 34P02Q01-01E).