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5. TROUBLESHOOTING
EO18-33016A
5. TROUBLESHOOTING
5- 5
Possible cause Check point Solution
The feed gap sensor has
not been adjusted.
Usually, a sensor calibration is automatically
performed. However, for some media, it
may be necessary to register a print area
level voltage and a no paper level voltage in
the system mode. The difference between
two voltages must be 1V or more.
Refer to the System Mode Manual,
Section 2.5, and adjust the sensor.
If “SENSOR ERROR” still appears after
an adjustment, there can be the
following failures:
(1) Upper and lower sensor positions
(2) Foreign object is caught in the
sensor.
(3) Connectors are not inserted
completely.
(4) Sensor PCB is faulty.
(5) Sensor harness or MAIN PC board
is faulty.
The sensor harness is
not connected properly.
Check if the sensor harnesses are properly
connected.
Connect the harness completely.
The media sensor is not
installed correctly.
• If the sensor harnesses are not
completely connected, or sensor
harnesses are faulty, the sensor cannot
function properly.
• The sensor position is moved along the
slit with 2-mm pitch teeth. But if the
stopper of the sensor is damaged, an
alignment cannot be performed properly.
• Check if the photo-transistor on the upper
sensor PCB is aligned with a hole in the
upper sensor cover.
If the problem still occurs even after
clearing the faulty part, the sensor PCB
may be faulty.
3. A feed jam (paper jam) error occurs when the black mark sensor is used.
Possible cause Check point Solution
Media type is not suitable
for the selected sensor.
A sensor error may occur depending on the
combination of the selected sensor and the
media type to be used.
(e.g.) Black mark sensor + Media without
black marks
Change the command or media type
properly.
Or, the media may need to be modified
so that a print start position detection
can be performed correctly.
The black mark sensor
position is not proper.
The black mark sensor position needs to be
adjusted so that the sensor can detect black
marks. Without position adjustment, a
sensor error or no paper error occurs
improperly.
Adjust the black mark sensor position to
the center of a black mark.
A foreign object is
attached to the sensor.
If paper or ribbon particles, or other foreign
objects are attached to the sensor, the
sensor cannot function properly.
Remove the foreign objects.