Cover Open Lever; Cover Open Sensor; Print Buffer-Full Printing - Epson TM-T90 Specification

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3.9 Cover Open Lever

When the cover open lever is pulled, the printer cover is opened. When the cover is closed, the cover
open lever is latched.
NOTES: • Be sure to use the cover open button to open the printer cover.
• Do not open the cover during printing.
• Do not open the cover during the autocutting operation; otherwise the mechanism may be
damaged.

3.10 Cover Open Sensor

The cover open sensor monitors the printer cover. When the sensor detects a cover open during
printing, the printer enters an error state and goes offline automatically.
When automatic error recovery is selected:
The printer recovers to online when the cover is closed.
If the printer detects the cover open during printing, the error LED flashes. When the cover is closed,
the error LED turns off, and the printer initializes by itself and starts printing from the beginning of the
line that stopped printing.
When possible error recovery is selected:
To recover to online, when the cover is closed, the printer recovers upon receipt of DLE ENQ 1 or DLE
ENQ 2. If the cover is open during standby, the printer goes offline. When the cover is closed, the
printer recovers to online.
NOTE: Whether the cover is open or not does not affect the status reported by the paper roll end
sensor.

3.11 Print Buffer-full Printing

• In standard mode
When subsequent data is received after the printer processes one line of data in the print buffer,
the printer prints the processed line and automatically feeds the paper one line
• In page mode
When subsequent data is received after the printer processes one line of data in the print buffer,
the printer prints the processed line and automatically sets the print starting position to the next
line (in page mode).
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