Symptoms And Solutions; Symptoms When Power Is On - Epson TM-U220 Series Service Manual

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Symptoms and Solutions

Symptoms when Power is On

POWER LED does not light
Table 3-1 POWER LED not Lit
Probable part/probable cause Checkpoints
External power unit
Cable connector (1098)
Sub circuit board unit (123)
Main circuit board unit (201)
(Refer to page 3-21.)
ERROR LED lights
Table 3-2 ERROR LED On
Probable part/probable cause
Roll paper cover assembly (119)
Paper-end state
Rev. B
Check the connections. Make sure the
connector is plugged in.
Check the output voltage. Make sure
24 V is coming out.
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)
Check the sub circuit board unit for
damage. Make sure it looks normal.
Check the resistance value of fuses F1
and F4. Make sure neither fuse is blown.
Check the operation of SW1.
Check the power voltage. Make sure the
power voltage has proper voltage rating.
Checkpoints
Check the roll paper cover assembly.
Make sure the roll paper cover is
closed.
Check the roll paper.
TM-U220 Type A Service Manual
Action to correct the problem
Plug in the connector. Completed if
the POWER LED lights.
Replace power unit. Completed if
the POWER LED lights.
Plug in the connectors. Completed if
the POWER LED lights.
Replace the sub circuit board unit
(123). Completed if the POWER LED
lights.
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.
Replace the main circuit board unit
(201). Completed if operation is
normal.
Action to correct the problem
Close the roll paper cover assembly.
Completed if the ERROR LED turns off.
Load the roll paper properly.
Completed if the ERROR LED turns off.
Troubleshooting 3-3