Jadis JPL, Owner'S Manual

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Maintenance
Your Jadis preamplifier is adjusted for a nominal voltage
corresponding to your country's electrical network.
If you don't use your preamplifier during a long time (a night for
instance), think about switching it off. Keeping your unit switching on
during more than 24 hours, may generate deterioration.
If the preamplifier fails to operate:
1 - Turn OFF the unit immediately.
2 - Unplug all the cables.
3 - Do not forget the mains cord and the power supply/module
cable.
4 - Contact your Jadis dealer for diagnostic and repair.
To clean your preamplifier, use a soft cloth with a non abrasive
cleaning product.
Do not forget to unplug all connectors before cleaning.