Epson SureColor T3000 User Manual page 221

A light is visible inside the printer.
This is not a failure.
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The light is a light inside the printer.
The administrator password has been lost.
Should you forget the administrator password, contact your dealer or Epson Support.
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Head cleaning starts when the printer is turned on.
When turned on after an extended period of disuse, the printer may automatically perform head
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cleaning to ensure print quality.
Head cleaning will end after about 10 to 15 minutes.
Problem Solver 221