Epson TM-U220 Series Service Manual

Rev. B Troubleshooting 3-3
TM-U220 Type A Service Manual
Confidential
Symptoms and Solutions
Symptoms when Power is On
POWER LED does not light
ERROR LED lights
Table 3-1 POWER LED not Lit
Probable part/probable cause Checkpoints Action to correct the problem
External power unit
Check the connections. Make sure the
connector is plugged in.
Plug in the connector. Completed if
the POWER LED lights.
Check the output voltage. Make sure
24 V is coming out.
Replace power unit. Completed if
the POWER LED lights.
Cable connector (1098)
Check the connectors. Make sure the
ones below are plugged in:
❑ Connector (CN10) on the main circuit
board unit (201)
❑ Connector (CNC3) on the sub circuit
board unit (123)
Plug in the connectors. Completed if
the POWER LED lights.
Sub circuit board unit (123)
Check the sub circuit board unit for
damage. Make sure it looks normal.
Replace the sub circuit board unit
(123). Completed if the POWER LED
lights.
Main circuit board unit (201)
(Refer to page 3-21.)
Check the resistance value of fuses F1
and F4. Make sure neither fuse is blown.
If the circuit board has no damage,
such as burns, replace fuse F1 or F4.
Completed if the POWER LED lights.
If the fuse blows when power is
turned on, unplug all connectors
from the mechanism assembly (120)
and check again.
If the POWER LED does not light and
the fuse is blown, replace the main
circuit board unit.
Check the operation of SW1.
Replace the main circuit board unit
(201). Completed if operation is
normal.
Check the power voltage. Make sure the
power voltage has proper voltage rating.
Table 3-2 ERROR LED On
Probable part/probable cause Checkpoints Action to correct the problem
Roll paper cover assembly (119)
Check the roll paper cover assembly.
Make sure the roll paper cover is
closed.
Close the roll paper cover assembly.
Completed if the ERROR LED turns off.
Paper-end state Check the roll paper.
Load the roll paper properly.
Completed if the ERROR LED turns off.

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