If you are having problems with your DS335 or DS340 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 +/- key down, turn the power back on. After two seconds release the +/- 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.
If you are still having trouble with your DS335 or DS340, it will need to come back to SRS for service. Click here to get an RMA number.