Epson TM-U220 Series Service Manual

Rev. B Troubleshooting 3-5
TM-U220 Type A Service Manual
Confidential
CPU execution error Check the connection of the I/F
circuit board unit (122). Make
sure the connector is plugged
into the main circuit board unit
(201).
Connect the I/F circuit board unit
(122). Completed if operation is
normal.
Check parts on the I/F circuit
board unit (122) for damage.
Make sure the I/F circuit board
unit appears normal.
Connect the I/F circuit board unit
(122). Completed if operation is
normal.
Check main circuit board unit
(201) parts for damage. Make
sure the main circuit board unit
(201) looks normal.
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 connection of the head
FFC (521). Make sure it is plugged
into the print head unit (503) and
connector (CN9) on the main
circuit board unit (201).
Connect the head FFC (521).
Completed if operation is normal.
Check the continuity of the print
head unit (503). Make sure wires
are not broken or shorted out.
Connect the print head unit (503).
Completed if operation is normal.
Check if main circuit board unit
(201) parts have any damage.
Make sure the main circuit board
unit (201) looks normal.
Replace the main circuit board unit
(201). Completed if operation is
normal.
The ERROR LED flashes 3 or 6 times
and then does not operate all.
Check the setting of DIP SW2-6.
OFF: Initial state
ON: Rewriting flash memory.
Switch DIP SW2-6 on the main circuit
board unit (201) to OFF. Completed if
operation is normal.
If operation is not normal, rewrite the
firmware. Completed if operation is
normal.
Table 3-3 ERROR LED Flashes
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