If you are having problems with your CG635 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.
1) Instrument is unresponsive to front-panel button presses
Try a power-up reset. Turn the power off, then while holding the BSP key down, turn the power back on. After two seconds release the BSP 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) You wish to install the Option 3 rubidium clock
Click here to download the installation procedure. You will need to call SRS at
3) Replacing the power supply
Click here to download instructions on replacing the power supply. You will need to call SRS at
If you are still having trouble your CG635, it will need to come back to SRS for service. Click here to get an RMA number.