Troubleshooting: Marshall JMP Synergy Preamp Module
Short answer
Check all guitar and speaker cables. If possible, swap with another cable or guitar. Test your amp without any effects pedals in the chain.
Try this first – basic troubleshooting steps
Before checking specific issues, start with these quick steps:
Check all guitar and speaker cables.
If possible, swap with another cable or guitar.
Test your amp without any effects pedals in the chain.
Module does not fit or is difficult to insert
Loosen the 4 screws on the front of the module bay by turning them ¼ turn counter‑clockwise.
No output
Make sure the Volume knobs on both the Module and your Synergy hardware are turned up.
Check the volume controls on any other devices in your signal chain.
Noise, static, or interference
Check all cables, and replace any that might be faulty.
Move your Synergy hardware, amplifier, and speakers to a different location.
Keep mobile phones and other electronic devices further away from your Synergy hardware.
Module was working, then stopped
If the module suddenly stops working, please contact Synergy's Support Team and they will help you get it sorted.
No lights after inserting module
If your module doesn’t light up even though the hardware is powered on, please reach out to Synergy's Support Team for help.