Epson TM-U220 Series Service Manual page 28

Confidential
PAPER OUT LED lights
Table 3-4 Paper OUT LED lights
Probable part/probable cause
Roll paper
Paper end assembly (514)
Near-end sensor
Main circuit board unit (201)
Symptoms when the self-test is executed
Self-test is not executed
Before running the self-test, make sure the roll paper and ribbon are correctly installed in the
printer. Then turn power off. To run the self-test, turn the power on while holding down the
FEED button. If the test does not print, check the following:
When the POWER LED does not light: Refer to page 3-3.
When the POWER LED lights: Refer to page 3-7.
When the POWER LED flashes: Refer to page 3-7.
3-6 Troubleshooting
Checkpoints
Check the roll paper. Make sure it is
loaded correctly. Make sure enough
paper is left.
Check operation of the paper end
assembly (514). Make sure the continuity
changes when you operate the switch.
Check operation of the micro switch
(1039). Make sure the continuity
changes when you operate the switch.
Check the parts for damage. Make sure
the following parts look normal.
CN6: for lead wires of the near-end
sensor
CN4: on the HP board assembly
Action to correct the problem
Replace the roll paper. Completed if
the PAPER OUT LED turns off.
Replace the paper end assembly
(514). Completed if the PAPER OUT
LED turns off.
Replace the near-end sensor.
Completed if the PAPER OUT LED
turns off.
Replace the main circuit board unit
(201). Completed if operation is
normal.
Rev.A