Epson TM-U220 Series Service Manual

Rev. B Troubleshooting 3-13
TM-U220 Type A Service Manual
Confidential
Line spacing is irregular
Two-color printing is not performed, or colors are mixed
Table 3-14 Irregular Line Spacing
Probable part/probable cause Checkpoints Action to correct the problem
Roll paper is inserted
incorrectly
Check the roll paper. Make sure it meets
specifications and is loaded correctly.
Load roll paper that meets
specifications correctly. Completed if
operation is normal.
Paper jam
Check the paper path. Make sure there
is no paper jam.
Open the roll paper cover and
remove the paper jam. Completed if
operation is normal.
Gear does not rotate
Check gear operation. Make sure the
following gears rotate with each other.
Paper feed gear (1063)
Paper feed middle gear B (510)
Paper feed middle gear (509)
Paper feed reduction gear 1 (1093)
Make sure the shaft of platen assembly 3
(522) rotates with the rotation of paper
feed reduction gear 2 (1058).
Replace the defective gear.
Completed if operation is normal.
Paper hold spring (1014)
Check the spring mounting. Make sure it
is mounted correctly. (Refer to page 4-
18)
Insert the paper hold spring (1014)
correctly. Completed if operation is
normal.
Paper hold roller (1015)
Check operation. Make sure it rotates
smoothly.
Replace the paper hold roller (1015).
Completed if operation is normal.
Paper guide roller (1045)
Check operation. Make sure it rotates
smoothly.
Clean, so the paper guide roller
(1045) rotates correctly. Completed if
operation is normal.
Table 3-15 Printing is not Two-color, or Colors are Mixed
Probable part/probable cause Checkpoints Action to correct the problem
Ribbon cassette
Check the ribbon type. Make sure it is for
2-color printing.
Replace the ribbon cassette with one
for 2-color printing. Completed if
printing is normal.
Check the mounting. Make sure the
ribbon is installed correctly.
Install the ribbon cassette correctly.
Completed if printing is normal.
Two-color shift function
Check the mounting of the spring. Make
sure the following springs are mounted
correctly.
Ribbon take-up spring (1088)
Ribbon frame spring (1022)
Mount the springs correctly.
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