If you are having problems with your DG535 you can call us at (408)744-9040 and speak with an engineer, or email us using our technical support request form. If you wish to send the instrument back to SRS for service click here.

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.

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.

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.

When the AB or CD output is set to drive a 50 Ω load, the complementary output (-AB or -CD) must be also terminated to 50 Ω. Otherwise, the output signal will be distorted.

Click here for details.

Click here for instructions on installing option 02.

Click here for instructions on installing a trigger inhibit input.

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).