Citizen CBM-270 Service Manual page 16

Phenomenon
Too much ink blot
Blurred characters
* If the printer continues to print for a long time, the printed characters become thicker.
printing is suspended and restarted, print concentration will change slightly.
concentration becomes lower if used at a low temperature.
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Phenomenon
A printing paper feed
motor does not work or
malfunctions.
The printing paper is
not fed or
irregularly.
Cause
Faulty power supply
Foreign substance
adhered to the thermal
head or platen roller
Faulty printing paper
Worn platen roller
Cause
Faulty connection of
motor connector
Faulty power supply
Faulty motor body
Faulty paper feed
fed
Foreign substance in
the gear
Broken gear
Faulty motor body
Check Method
Check whether or not
the specified AC adapter
is used.
Check the thermal
head and platen roller
for any adhered foreign
substance.
Check whether or not
the specified printing
paper is used.
The platen roller is
worn out and
easily.
Check Method
Check the
connector for
connection.
Check whether or not
the specified
AC adapter is used.
Use a tester
oscilloscope to measure
a supply voltage and
waveform.
Check whether or not
the printing paper is
jamming or torn and
caught in a paper path.
Check the motor gear
for any foreign
substance.
Check whether or not
the motor gear
broken.
Use a tester
oscilloscope to measure
a supply voltage and
waveform.
16
CBM-270 Service Manual
Repair Method
Use the specified
AC adapter.
Dip a cotton swab or
soft cloth in ethyl
alcohol and wipe off
the foreign substance.
Replace with
recommended
or its equivalent.
Replace the
slips roller unit.
Repair Method
motor Connect
its connector properly.
Use the specified
AC adapter.
or If the supply voltage
and waveform
normal, replace the
motor
mechanism).
Remove unnecessary
printing paper and
set properly.
Remove the foreign
substance.
Replace the
is (printer mechanism).
or If the supply voltage
and waveform
normal, replace the
motor
mechanism).
the
paper
platen
If
Print
the
are
(printer
motor
are
(printer
CITIZEN