Epson TM-U220 Series Service Manual

Rev. B Troubleshooting 3-11
TM-U220 Type A Service Manual
Confidential
Paper is not cut correctly
Ribbon feed mechanism does not operate
Table 3-9 Cutter not Working Correctly
Probable part/probable cause Checkpoints Action to correct the problem
DIP switch setting
Check the setting of DSW 2-2.
OFF: Autocutter is disabled.
ON: Autocutter is enabled.
Switch DSW 2-2 to ON. Completed if
cutting is normal.
Full cut/partial cut setting
Check the full cut and partial cut
setting. Make sure the autocutter unit
(113) is mounted in the correct position.
Mount the autocutter unit (113) in the
correct position. Completed if cutting
is normal.
Fixed blade spring (1016)
Check the spring power. Make sure it
has enough power to push the fixed
blade (513) against the fixed blade
holder (1017).
Replace the fixed blade spring (1016).
Completed if cutting is normal.
Cutter blade
Check the fixed blade (513). Make sure
it does not have any nicks.
Replace the fixed blade (513).
Completed if cutting is normal.
Check the movable cutter blade on
the cutter frame assembly (114). Make
sure it does not have any nicks.
Replace the cutter frame assembly
(114). Completed if cutting is normal.
Table 3-10 Ribbon Feed Mechanism not Functioning Correctly
Probable part/probable cause Checkpoints Action to correct the problem
Ribbon cassette
Check the mounting. Make sure it is
installed correctly.
Install the ribbon cassette correctly.
Completed if printing is normal.
Check the ribbon cassette itself. Make
sure the ribbon is fed by turning the
tab.
Replace the ribbon cassette with a
new one. Completed if printing is
normal.
Ribbon take-up function
Check the take-up operation. Be sure
the following parts move with
operation of the carriage sub
assembly (1025):
❑ Belt drive pulley (505)
❑ Ribbon middle gear (512)
❑ Ribbon drive plate sub assembly
(517)
❑ Ribbon take-up gear sub assembly
(516)
Replace the defective gear.
Completed if the operation is normal.
Adjustment roller shaft holders
(506)
Check the platen gap adjustment.
0.45 mm: falls with no weight applied
0.55 mm: does not fall
Adjust the platen gap (refer to page
5-5). Completed if printing 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