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CBM-920 Service Manual
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Phenomenon Cause Check Method Remedy
Faulty power supply Check whether 5 V DC is
available.
Supply 5 V DC.
Faulty mounting and
connection of an interface
cable
Check mounting and
connection of the interface
cable.
Connect the interface
cable correctly.
Printing failure
No printing
Faulty printer
mechanism
Replace the printer
mechanism unit.
Thin printing
color
Faulty power supply Check whether a 5 V DC
power capacity is sufficient.
Use the power source
with a sufficient capacity.
Missing dots Foreign substance
adhered to a printing
head
Check the head for any
adhered foreign substance.
Eliminate the foreign
substance.
Bad printing
quality
Faulty ribbon Replace the ribbon.
Faulty connection of a
motor connector
Check connection of the
connector.
Connect the connector
correctly.
Faulty power supply Check whether a 5 V DC
power capacity is
sufficient.
Use the power source
with a sufficient capacity.
Paper feed failure
A printing paper
feed motor does
not function or
malfunctions.
Faulty printer
mechanism
Replace the printer
mechanism.
Paper feed failure Check whether or not the
printing paper is jamming
or torn and caught in a
paper path.
Eliminate unnecessary
printing paper and re-set
it correctly.
Foreign substance in the
gear
Check the motor gear of
the printer mechanism for
any foreign substance.
Eliminate the foreign
substance.
The printing
paper is not fed
or fed
irregularly.
Broken gear Check the motor gear for
breakage.
If broken, replace the
printer mechanism.
Faulty sensor
Does not detect
the printing
paper.
Faulty paper sensor Check the window of
the paper sensor for any
foreign substance.
Eliminate the foreign
substance or replace the
printer mechanism.
When the trouble
still persists
Replace the control
board and check
whether the printer
functions properly.
Replace the control
board.
* For the printer mechanism MD910 series, see the Service Manual separately provided.