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MX10C, MX40C Series of Optical Transmitters Chapter 9: Troubleshooting
Rev. F, February 21, 2020 Page 31
Chapter 9 Troubleshooting
Below is some information about status indicators and a few checks to help in troubleshooting general problems. If you have
any questions, please contact your local Thorlabs Technical Support office.
If the unit does not appear to turn on correctly, please check the following items :

Ensure that the main AC receptacle is powered

Ensure that main power cable is fully seated at both ends

Ensure that back
power switch is in the “I” position

Check the main power fuse (see Maintenance and Repair Section)
The color of the Standby Button, which is on the front panel, indicates several status conditions as follows:
Standby Button Color Condition
Solid Green Indicates normal ON state.
Solid Amber
Indicates unit is in Standby Mode.
Press the button to turn the instrument ON.
Blinking Green
Indicates the main AC power is unstable. When the AC power is
restored, the instrument will return to the standby mode (amber).
Blinking Amber
Indicates the instrument is overheated. Make sure the fan is running
and none of the vents are blocked. If there are no ventilation issues,
then the box should cool itself and return to the standby.
Do not operate, or leave the instrument in standby mode, in an
environment above 40 °C.
Blinking Amber/Green
Indicates the instrument is both overheated and the main AC power is
unstable (see individual troubleshooting for these conditions above).
Fading Amber/Green
Indicates the instrument is in the firmware upgrade mode.
If this condition appears after attempting to upgrade the firmware, the
update may have failed, or the unit may have been left in the update
mode. Try running the firmware update again.
This condition may have also been reached by holding down the
standby button for a long time while turning on the power. In this case,
turn the unit off, wait for a few seconds, and turn it back on.
If this condition for any other reason, turn the unit off, wait for a few
seconds, and turn it back on.
If these attempts to recover continue to fail, the instrument’s firmware
may have been corrupted. Contact Tech Support for help.
If the optical power at any point of the system is lower than expected , resolving the problem always starts by cleaning the
optical fiber ends. Contaminated fiber ends, which attenuates the intensity of the transmitted light, is a very common issue when
using single-mode fibers. Follow the suggestions provided in the Maintenance and Repair section of this manual to clean the
optical fiber ends.