Citizen CT-S651 Series Service Manual page 35

● Paper Feed Failure
Phenomenon
Paper is not fed.
Paper feed is not
straight.
● Faulty Sensor
Phenomenon
Paper presence or
absence cannot be
detected. Paper near
end cannot be detected.
The cover or front cover
open state is not
detected or remains in
the detected state.
● Auto Cutter Failure
Phenomenon
The auto cutter does not
operate.
Cause
The motor connector has a
bad connection.
The motor is faulty.
The supply voltage is low.
The control PCB is faulty.
The platen roller is not
mounted correctly.
Paper feed is faulty.
Foreign substances are stuck
in the gear. A gear is broken.
Cause
The paper sensor is faulty.
The paper near end sensor is
faulty.
The sensor spring is broken.
The connector has a bad
connection.
The sensor is faulty.
The sensor lever spring is
broken.
Cause
The connector has a bad
connection.
The auto cutter is faulty.
Paper feed is faulty.
(paper jams)
Check Method
Check the connecting
condition of the connector.
Measure the supply voltage
with a tester or oscilloscope.
Check the supply voltage
with a tester.
−
Check the mounting
condition of the platen roller.
Check if paper is jammed,
torn or caught in the paper
path.
Remove the gear holder and
check the gear for any
foreign substance or
breakage.
Check Method
Check the indication at the
LED or buzzer when the
paper ends.
Push the sensor by hand
and check if it returns.
Check the connecting
condition of the connector.
Check the indication at the
LED or buzzer while opening
and closing the cover.
Check the indication at the
LED or buzzer while opening
and closing the front cover.
Check Method
Check the connecting
condition of the connector.
Measure the supply voltage
with a tester or oscilloscope.
Check if paper is jammed,
torn or caught in the paper
path.
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CT-S651 Series Service Manual
Remedies
Connect the connector
correctly.
Replace "UNIT, MOTOR".
Use the printer within the
specified supply voltage
range.
Replace "SA, MAIN PCB".
Mount the platen roller
correctly.
Remove unnecessary paper
and set the paper correctly.
Eliminate foreign substance.
If any gear is broken, replace it
with a new one.
Remedies
Replace "UNIT, PE".
Replace "UNIT, PNE".
Replace "UNIT, PE" or "UNIT,
PNE".
Connect the connector
correctly.
Replace "SPRING
INTERLOCK".
Remedies
Connect the connector
correctly.
If the supply voltage is normal,
replace the auto cutter with a
new one.
Remove unnecessary paper
and set the paper correctly.