Epson TM-L90 Technical Reference - Page 116
Unrecoverable errors
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Unrecoverable errors Normal printer operation is no longer possible when unrecoverable errors occur. The printer may be out of order. If the same error occurs again even after turning the power back on, contact your dealer or a Epson service center. CAUTION: When an unrecoverable error occurs, turn off the power supply immediately. Unplug the AC cable from the printer when the power switch is invalid. ❏ TM-L90 unrecoverable errors Unrecoverable Errors Error name Type of error Error LED flash code Recovery measure Approx.320 ms R/W error in memory After R/W checking, the printer does not work correctly. LED ON LED OFF High voltage error Low voltage error CPU execution error Internal circuit connection error The power supply voltage is extremely high. LED ON LED OFF The power supply voltage is extremely low. LED ON LED OFF The CPU executes an incorrect address or I/F board is not connected. Internal circuits are not connected correctly. LED ON LED OFF LED ON LED OFF UIB error An abnormal operation occurs in UIB. LED ON LED OFF Approx.5120 ms Approx.2560 ms Impossible to recover. Impossible to recover. Impossible to recover. Impossible to recover. Impossible to recover. Impossible to recover. 116 Handling