Video showing how I reseated the EPROMS in the Ensoniq ESQ-1 to fix an intermittent fault.
The ESQ-1 would crash/lock-up and emit a high-pitched tone. There is no response from keys or menu buttons. Restarting (power cycling) didn’t fix the issue. Synth then needed to be turned off and left for a few days before it was usable again.
Make sure the battery isn’t faulty. Test with a multimeter and ensure that the voltage is 3V
Using an IC puller – carefully remove and re-insert the two EPROM chips (shown in the video).
Test to see if this fixes the problem.
Hope this helps