If you are having problems with your DG535 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) There is no signal at one of the channel outputs
Most likely, the output stage transistor is damaged and needs replacing. If your instrument is old, it may have an MRF965 transistor at the output. If it is new, it will have a small assembly in a socket instead of the MRF965. In either case, you will need to replace either the MRF965 or the assembly with a new assembly (part number 534 ASSY).
You can order the 534 ASSY assembly by clicking here.
3) Front panel pulse outputs look distorted
When the AB or CD output is set to drive a 50 Ω load, the complementary output
Click here for details.
4) Installing option 2 (32 V outputs)
Click here for instructions on installing option 02.
5) Installing a trigger inhibit input
Click here for instructions on installing a trigger inhibit input.
6) Replacing the LCD display
Click here for instructions on installing a replacement LCD display. To purchase the replacement LCD-DG display click here, and from the pull down list choose SRS Replacement Parts (products are in alphabetical order).
If you are still having trouble your DG535, it will need to come back to SRS for service. Click here to get an RMA number.