Epson TM-L90 Technical Reference Manual page 116

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
R/W error in memory
High voltage error
Low voltage error
CPU execution error
Internal circuit
connection error
UIB error
116 Handling
Type of error
After R/W checking, the
printer does not work
correctly.
The power supply voltage
is extremely high.
The power supply voltage
is extremely low.
The CPU executes an
incorrect address or I/F
board is not connected.
Internal circuits are not
connected correctly.
An abnormal operation
occurs in UIB.
Error LED flash code
Approx.320 ms
LED ON
LED OFF
Approx.5120 ms
LED ON
LED OFF
LED ON
LED OFF
LED ON
LED OFF
LED ON
LED OFF
Approx.2560 ms
LED ON
LED OFF
Recovery measure
Impossible to
recover.
Impossible to
recover.
Impossible to
recover.
Impossible to
recover.
Impossible to
recover.
Impossible to
recover.