Epson TM-U220 Series Service Manual

3-4 Troubleshooting Rev. B
Confidential
ERROR LED flashes
Table 3-3 ERROR LED Flashes
Probable part/probable cause Checkpoints Action to correct the problem
Home position detection error Check for jammed paper
around the carriage. Make sure
there is no paper jam.
Remove any jammed paper.
Completed if operation is normal.
Check the tension of the
carriage belt (507). Make sure
the carriage belt has
appropriate tension.
Adjust carriage belt tension (Refer to
page 5-6). Completed if operation is
normal.
Check operation of the parts
around the carriage by moving
the carriage from side to side.
Make sure the belt drive pulley
(505) rotates by moving the
carriage sub assembly (1025)
from side to side.
Reinstall the carriage belt (507) into
the carriage sub assembly (1025).
Completed if operation is normal.
Check the resistance value of
the carriage motor sub assembly
(1034). Make sure it is 7.2 Ω or
less.
Replace the carriage motor sub
assembly (1034). Completed if
operation is normal.
Check the operation of the HP
board assembly (518). Make sure
the signal changes when you
block the sensor.
Replace the HP board assembly
(518). Completed if operation is
normal.
Check the connection of main
circuit board unit (201)
connectors. Make sure they are
plugged in securely.
CN7: carriage motor sub
assembly (1034)
CN4: HP board assembly (518)
Plug in the connectors securely.
Completed if operation is normal.
Check if the parts on the main
circuit board unit (201) have any
damage. Make sure connector
CN7 and U8 look normal.
Replace the main circuit board unit
(201). Completed if operation is
normal.
R/W error in memory
Check for repeatability. Make
sure operation is normal by
rebooting.
Replace the main circuit board unit
(201). Completed if operation is
normal.
High-voltage error Check the DC power voltage on
the main circuit board unit (201).
Make sure the power voltage
has the proper voltage rating.
(Refer to page 3-21.)
Replace the main circuit board unit
(201). Completed if operation is
normal.
Low-voltage error Check the DC power voltage on
the main circuit board unit (201).
Make sure the power voltage
has proper voltage rating. (Refer
to page 3-21.)
Replace the main circuit board unit
(201). Completed if operation is
normal.

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