Epson TM-U220 Series Service Manual

3-10 Troubleshooting Rev. B
Confidential
Check the parts on the main
circuit board unit (201) for
damage. Make sure the
following parts look normal.
Connector (CN2)
QM1
Replace the main circuit board unit
(201). Completed if operation is
normal.
Head high-temperature detection
circuit error
Check the print head
temperature. Make sure it is not
too high.
Wait for the print head temperature to
drop. Completed if operation is
normal.
Check the error frequency.
Make sure it does not occur too
often.
Replace the print head unit (503). If
the symptom continues, replace the
main circuit board unit (201).
Completed if operation is normal.
Roll paper cover open error
Check the state of the cover
when the error occurs. Be sure
not to open the roll paper cover
during printing.
If MSW 8-8 is OFF, close the roll paper
cover again. Completed if operation
is normal.
If the MSW 8-8 is ON, turn power on
again. Completed if operation is
normal.
If the error occurs when the roll paper
cover is not open, refer to “Cannot
pass one of the tests for a sensor” on
page 3-18.
Check the error frequency.
Make sure it does not occur too
often.
Replace the print head unit (503).
Completed if operation is normal. If
the symptom continues, replace the
main circuit board unit (201).
Completed if operation is normal.
Table 3-8 ERROR during Printing
Probable part/probable cause Checkpoints Action to correct the problem

Epson TM-U220 Series Specifications

General

Print Method	9-pin, serial impact dot matrix
Autocutter	Partial cut
Weight	Approx. 2.5 kg
Paper Thickness	0.06 to 0.085 mm
Operating Temperature	5 to 45 °C
Interface	RS-232, Bi-directional parallel, USB, Ethernet
Number of Columns	42 columns
Data Buffer	4 KB
Character Set	95 Alphanumeric, 128 x 12 Graphic
Power Supply	AC adapter
Operating Humidity	10% to 80% RH (non-condensing)
Print Speed	4.7 lines per second (at 40 columns, 16 dpi)
Paper Width	76 mm / 69.5 mm / 57.5 mm ± 0.5 mm
Copy Capability	Original + 2 copies