Citizen iDP3550 Service Manual page 19

• Paper feed failure
Phenomenon
Paper is not fed or fed
irregularly
• Faulty sensors
Phenomenon
Does not detect
presence of paper.
Does not detect paper
near-end status.
If the no-paper condition is not detected while the printer is running out of the recording paper, it will print
without the paper, leading to a trouble of the head, and so on.
Cause
Faulty connection of the
motor connector
Defective motor
Paper feed failure
(Paper jam)
Low AC supply voltage
Foreign substance in the
gear
Broken gear
Cause
Faulty paper sensor
Foreign substance, etc.
caught by the sensor
Faulty paper near-end sen-
sor
Faulty connection of the
paper near-end sensor
Foreign substance, etc.
caught by the sensor
Check Method
Check connection of the
motor connector.
Measure the supply
voltage with a DC
voltmeter or oscilloscope.
Check whether or not the
paper is jamming or torn
and caught in the paper
path.
Check the AC supply
voltage with an AC
voltmeter.
Remove the printer
mechanism and check for
any foreign substance
caught in the gear or motor
gear.
Remove the printer
mechanism and check for
any breakage of the gear or
motor gear.
Check Method
Replace the printer
mechanism and check if the
replaced one functions
properly.
Check whether the ERROR
lamp flickers when paper is
out.
Check for any foreign sub-
stance.
Check connection of the
connector.
Check for any foreign sub-
stance.
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iDP3550/3551 Service Manual
Remedy
Connect the connector
correctly.
If the supply voltage is
normal, replace the motor
(printer mechanism).
Eliminate unnecessary
paper in the paper path and
set paper properly.
Use the specified AC
voltage.
Eliminate the foreign
substance.
If broken, replace the
printer mechanism.
Remedy
Replace the printer
mechanism.
Eliminate the foreign
substance.
Replace the paper near-end
sensor.
Connect the connector cor-
rectly.
Eliminate the foreign sub-
stance.
CITIZEN