Sensors - Epson TM-L90 Developer's Manual

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Sensors

Paper sensors
The printer has two paper sensors.
Paper roll near-end sensor
The near-end sensor is located on the roll paper supply device. It detects the near-end of the
paper roll by detecting the paper roll diameter. You can adjust the sensor . See page 1-6 for
details for adjustment.
When it detects a paper near end, it either stops or continues printing, depending on the ESC c4
setting. The PAPER OUT LED lights.
When printing stop is enabled by the ESC c4, the sensor detects a paper near end and the printer
automatically goes offline after printing the current line. To restart printing, load new paper and
set the printer back online by closing the printer cover. The printer starts initializing and
continues printing data stored in the print buffer.
Paper roll end sensor
The paper end sensor is located in the paper path. It detects the presence of paper from the
paper roll in the paper path of the printer mechanism.
When there is no paper in the paper path (paper end status), the PAPER OUT LED indicator
lights.
When the sensor detects a paper end, black mark or label paper, printing stops even if it is in the
middle of one transaction; therefore, it is recommended to use the roll paper near end sensor
and use the paper end sensor as a supplement.
Printer cover sensor
Paper roll cover open sensor
The cover-open sensor monitors the paper roll cover. When the sensor detects a cover open
while printing, the printer stops printing immediately and automatically goes offline depending
on the setting of the memory switch 8-8 as follows:
J OFF(default) :
ON :
J
When the printer recovers, it feeds paper to take up the slack, and starts printing from the
beginning of the line where an error occurred. In this case, double printing and printing position
shift may occur. It is recommended to set the memory switch 8-8 to ON and clear the buffers by
DLE ENQ 2 and resend the print data.
Whether the cover is open or not does not affect the status reported by the paper roll end sensor.
3-8 Description of Functions
Automatic recovery error. The ERROR LED blinks. When the printer cover
is closed, the error LED goes off and the printer goes online and starts
printing at the beginning of the line it was printing when the cover was
opened.
Recoverable error. The ERROR LED blinks. Even if the cover is closed, the
error LED still blinks. You need to transmit the DLE ENQ command to
recover.
Rev. A