Citizen CBM-270 Service Manual page 17

• PNE Sensor Failure
Phenomenon
PNE is always detected.
PNE is detected even if
there is enough paper.
PNE is not detected.
• PE Sensor Failure
Phenomenon
PE is always detected.
PE is not detected.
∗ If PE is not detected with no printing paper set, the printer will print even if the paper is not set, causing a
trouble to the printer head, etc. If printing is performed in this condition, replace the platen roller and head.
Cause
Faulty sensor
Irregularity between the
sensor and printing paper
Foreign substance caught
by the sensor
Faulty sensor
Foreign substance caught
by the sensor
Sensor exposed to the
direct sunshine or strong
light
Cause
Faulty sensor
Faulty sensor
Foreign substance caught
by the sensor
Sensor exposed to the
direct sunshine or strong
light
Check Method
Use a tester to check
whether or not a supply
voltage and signal are
normal.
Check whether or not the
printing paper is aligned
with the core, and whether
or not it is set properly in
the holder.
Check for any foreign
substance.
−−−
Check for any foreign
substance.
Check operation, avoiding
the direct sunshine or
strong light.
Check Method
Use a tester to check
whether or not a supply
voltage and signal are
normal.
−−−
Check for any foreign
substance.
Check operation, avoiding
the direct sunshine or
strong light.
CBM-270 Service Manual
CBM-270 Service Manual
Repair Method
Replace the PNE sensor.
Set the printing paper
properly in the holder.
Align the printing paper
with the center.
Remove the foreign
substance.
Replace the PNE sensor.
Remove the foreign
substance.
Use in a place free from
the direct sunshine or
strong light.
Repair Method
Replace the PE sensor.
Replace the PE sensor.
Remove the foreign
substance.
Use in a place free from
the direct sunshine or
strong light.