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4. Abnormal Printing
NO
YES
Replace the
printhead.
Is the
self-test
printed
correctly?
YES
Are
printer
settings
correct?
START
Data received from
the host is not printed
correctly.
NO
YES
Are all
the dots printed
OK?
YES
Are
any wires
in the printhead
broken?
YES
Does
the resistance
of printhead wires
check
OK?
NO
Do all
the LEDs on
the control panel
blink at
power
on?
NO
YES
Is the
problem
corrected?
NO
END
YES
Is
the FFC
connected
correctly?
NO
Connect the
cable correctly.
YES
Is the
problem
corrected?
NO
END
YES
NO
Reset the
printer.
Is the
problem
corrected?
NO
END
YES
YES
Are
the correct
printer drivers
installed?
NO
Install the correct
printer drivers.
Is the
problem
corrected?
NO
END
YES
Check
the FFC using a
multimeter. Is it
OK?
NO
Replace the
FFC.
YES
Is the
problem
corrected?
NO
END
YES
Replace the C166
MAIN board.
END
Check
the FFC using a
multimeter. Is it
OK?
NO
Replace the
FFC.
YES
Is the
problem
corrected?
NO
END
YES
Replace the C166
MAIN board.
END
YES
Does
the printer
work OK with
another
computer?
NO
Problem with
computer.
END
Replace the C166
MAIN board.
END
Is the
bottom of
characters
missing?
NO
Reinstall the
ribbon mask.
YES
Is the
problem
corrected?
NO
END
YES
Check printhead, motors
drivers, and power
supply with a meter.
Replace any bad parts.
Is the
problem
corrected?
END
YES
NO
Figure 5-6 Flowchart 4
FX-2170 Service Manual Troubleshooting
Rev.A 5-9