I have a used Yamaha DTxpressIII module not the DTxplorer but it sounds as though the power supply is shot. The power supply unit can fail anytime with no warning. Do you have a warranty? Is there a possibility to open up the module and with a voltage meter, check to see if the power input wire can pass voltage?
This is the specifc power supply adapter needed for the Yamaha DTXplorer:
DC 12V/AC adaptor model PA-3C. Call your local music store and if they carry Yamaha kits, they can get you in contact with their Yamaha sales rep. and maybe order a new power supply adapter before throwing in the towel.
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