If you are having problems with your FS740 you can call us at
If you wish to try and fix the problem yourself, the user manual may be useful, and the following troubleshooting guide may be helpful too.
Troubleshooting Guide
1) Instrument is unresponsive to front-panel button presses
Try a power-up reset. Unplug the instrument, then while holding down the CONFIG key in the SYSTEMS section of the front panel, plug the instrument back into the AC line. After two seconds release the CONFIG key. If this doesn't correct the problem the instrument will need to come back to SRS for service. Click here to get an RMA number.
2) I want to upgrade my FS740 with the optional OCXO or Rubidium timebase
If you want to upgrade your existing FS740 with the optional OCXO or
Click here to download the installation procedure. You will need to call SRS at
3) Upgrade existing units with additional distribution outputs
If you want to upgrade your existing FS740 unit with optional distribution amplifiers (Opt. A, Opt. B, Opt. C), you can either send your instrument back to SRS for service or you can try installing the option yourself.
Click here to download the installation procedure. You will need to call SRS at
4) I want to use a USB to ethernet adapter for communication
For details on using a USB to ethernet adapter for communication click here.
If you are still having trouble your FS740, it will need to come back to SRS for service. Click here to get an RMA number.
