EPSON FX-2180 Service Manual Chapter 3 Troubleshooting
3-7
4. Abnormal Printing
START
Is the self test
printed correctly?
Check the data from the
host PC using the hex
dump mode.
Are all the
dots printed
correctly?
Are any print head
wires broken?
Is the problem
solved?
Are the printer
settings correct?
Reset the settings
to their defaults.
END
Are the correct
printer drivers
installed?
Install the correct
printer drivers.
Is the problem
solved?
END
Does the printer
work correctly with
another printer
cable?
Replace the
cable.
Replace the main
board.
END
END
YESNO
YES
NO
YES
NO
NO
YES
NO
NO
YES
YES
NO
Is the problem
solved?
The computer is the
source of the
problem.
YES
NO
Perform the
bidirectional alignment.
(See Chapter 5.)
Is the
problem
solved?
END
Are all the
dots aligned
correctly?
Check the platen
gap/parallelism. (See
Chapter 5.)
Is the
problem
solved?
END
Replace the
print head.
END
Check the print head's
coil resistance as
described in Table 3-1.
Is the print head
coil resistance
correct?
Check the FFC
using a multimeter.
Is the FFC
OK?
Are the bottoms of the
characters missing?
Replace
the FFC.
Is the
problem
solved?
END
Reinstall
the ribbon
mask.
Is the
problem
solved?
END
Test the print
head drivers on
the main board
as described in
Table 3-7.
Are the print
head drivers on
the main board
OK?
Replace the
print head
and the main
board.
END
Replace the
print head.
END
NO
YES
YES
NO
YES
NO
YES
NO
YES
YES
YES
NO
NO
YES
NO
NO
YES
YES
NO
NO
B
YES
Figure 3-7. Flowchart 4
3.4 Repairing the Power Supply Board
The table below provides instructions on how to repair the power supply
board assembly. It lists various power supply board problems and
provides likely causes, checkpoints, and solutions. To determine whether
a component is defective, compare its readings with the correct
waveforms, resistances, and other values listed in the table below. Then
replace the component if necessary.
WARNING
The OPERATE button on the control panel only
turns the secondary power circuit on or off, so the
primary circuit is live as long as the printer is
connected to an AC power outlet. Before you
touch the power supply board or repair it,
disconnect the printer from the AC power outlet.
Note:
Use an oscilloscope to check the waveforms in Table 3-6.
Table 3-6. Repairing the Power Supply Board
Problem Cause Checkpoint Solution
The +35 V and +5
V lines are not
output when the
printer is turned
on.
Diode bridge DB1
is dead.
Measure the DC
voltage between pins
3 and 4 of DB1.
Replace
DB1.
Transformer coil
T1 is open.
Measure the
resistances of the T1
transformer coils at
pins 12 and 15, 9 and
11, 7 and 8, and 3
and 4.
Replace
T1.
