Unrecoverable Errors - Epson TM-T20 Technical Reference Manual

Unrecoverable Errors

Printing is no longer possible when unrecoverable errors occur. The printer must be repaired.
Turn off the power immediately when an unrecoverable error occurs.
CAUTION
Error
Memory R/W error
High voltage error
Low voltage error
CPU execution error
Internal circuit
connection error
18
Error description
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 is executing an
incorrect address.
Internal circuits are not
connected correctly.
Error LED flashing pattern
LED ON
LED OFF
Approx. 160 ms
LED ON
LED OFF
Approx. 160 ms
LED ON
LED OFF
Approx. 160 ms
LED ON
LED OFF
Approx. 160 ms
LED ON
LED OFF
Approx. 2.56 s
Approx. 160 ms