Epson TM-U220 Series Service Manual page 31

Confidential
Paper is fed, but characters are not printed.
Table 3-7 Paper is fed, but characters are not printed
Probable part/probable cause
Ribbon cassette
Head FFC (521)
Print head unit (503)
Main circuit board unit (201)
Error occurs during printing
Table 3-8 ERROR occurs during printing
Probable part/probable cause
Autocutter error
Rev.A
Checkpoints
Check the ribbon mounting. Make sure
it is installed correctly.
Check the ribbon. Make sure it is not
wrinkled, kinked, or broken.
Check the continuity with a tester. Make
sure wires are not broken or shorted out.
Check the continuity with a tester. Make
sure wires are not broken or shorted out.
Check parts for damage. Make sure the
following parts look normal.
Connector (CN9)
QM22, QM23, QM24
.
Checkpoints
Check the connection of the
main circuit board unit (201)
connector. Make sure the AC
lead wire set (1090) is
connected.
Check the operation of the drive
gear sub assembly (1072). Make
sure it rotates with rotation of the
cutter motor sub assembly (117).
Check the operation of the
cutter motor sub assembly (117).
Check the operation of the
micro switch (121). Make sure
the continuity changes when
you operate the switch.
Check the AC lead wire set
(1090) for breaks and shorts.
Make sure wires are not broken
or shorted out.
Check fuse F3 on the main
circuit board unit (201). Make
sure it is not blown.
TM-U220 (TypeB/TypeD) Service Manual
Action to correct the problem
Load the ribbon cassette correctly.
Completed if operation is normal.
Replace the ribbon cassette with a
new one. Completed if printing is
correct.
Replace the head FFC (521).
Completed if printing is correct.
Replace the print head unit (503).
Completed if printing is correct.
Replace the main circuit board unit
(201). Completed if the print is correct.
Action to correct the problem
Plug in the connector. Completed if
operation is normal.
Replace the drive gear sub assembly
(1072). Completed if operation is
normal.
Replace the cutter motor sub
assembly (117). Completed if
operation is normal.
Replace the micro switch (121).
Completed if operation is normal.
Replace the AC lead wire set (1090).
Completed if operation is normal.
If the circuit board has no damage
such as burns, replace fuse F3.
Completed if operation is normal.
If the fuse blows again in operation of
the autocutter, replace the main
circuit board unit.
Troubleshooting 3-9