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2. SYSTEM MODE EO13-33002
2.1 Self-diagnostic Test
2-14
(7) Sensor 2 Check
The status of the Print Head Thermistor, Ambient Temperature Thermistor, Black Mark Sensor, and
Feed Gap Sensor, Print Head resistance rank, and print head resolution are printed.
SENSOR2 [H]23°C [A]22°C [R]4.2V [T]2.5V
Sensor/Thermistor Print status description
Print head thermistor A thermistor built in the print head detects a print head
temperature. The current supplied to the print head (= print tone)
is controlled on the basis of this temperature.
When the print head overheats (80°C or over), the printer
displays “EXCESS HEAT TEMP” message and stops printing to
protect the print head.
Ambient temperature thermistor Temperature inside the printer (around the media) is detected.
The current supplied to the print head (= print tone) is controlled
on the basis of this temperature. When the temperature of 61°C
is detected, an error message, “EXCESS HEAT TEMP”, is
displayed and the printer stops.
Black mark sensor Real time voltage detected by the black mark sensor is
displayed/printed.
Feed gap sensor Real time voltage detected by the feed gap sensor is
displayed/printed.
Print head resistance rank There is individual variability in average resistance of the thermal
element. The current supplied to the print head is controlled on
the basis of this value to obtain the optimal print tone.
(8) Paper End Level Check
PE LV. [R]1.2V [T]4.3V
Feed gap sensor status:
0.0 to 5.0V
Black mark sensor status:
0.0 to 5.0V
Print head thermistor status:
0°C to 86°C
Ambient temperature thermistor status:
0°C to 86°C
If it is undetectable, “--°C “ is printed.
Transmissive sensor no paper level:
0.0 to 5.0 V
Reflective sensor no paper level:
0.0 to 5.0 V
Paper End Level