10
CT-S300 Service Manual
• Printing failure
Phenomenon
No printing
Partly not printed
Faint printout or uneven
printout
Cause
Faulty DC output voltage
from the AC adapter
Faulty control PCB assy
Faulty connection of the
thermal head connector
Faulty thermal head
Faulty connection of the
thermal head connector
Faulty thermal head
Faulty DC output voltage
from the AC adapter
Low DC output voltage
from the AC adapter
Faulty thermal head
Foreign substance is
adhered to the thermal
head.
Non-recommended paper
is used.
Faulty mounting of the
platen roller
Check Method
Check whether the
specified AC adapter is
used.
—
Check connection of the
thermal head connector.
—
Check connection of the
thermal head connector.
—
Check whether the
specified AC adapter is
used.
Check the DC voltage with
a DC voltmeter.
—
Check whether any foreign
substances are adhered to
the thermal head.
Check whether the paper
being used meets the
specification.
Check mounting condition
of the platen roller.
Remedy
Use the specified AC
adapter.
Replace the control PCB
assy.
Connect the thermal head
connector properly. Or
replace the head cable assy.
Replace the thermal head.
Connect the thermal head
connector properly. Or
replace the head cable assy.
Replace the thermal head.
Use the specified AC
adapter.
Supply the specified AC
voltage to the AC adapter.
Replace the thermal head.
Dip a cotton swab or soft
cloth in ethyl alcohol and
wipe the foreign substances
with them.
Replace it with the
specified paper.
Mount the platen roller
properly.
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