Epson TM-U220 Series Service Manual

3-22 Troubleshooting Rev. B
Confidential
The locations of the main elements on the main circuit board unit are identified below.
Resistance Values of Printer Mechanism Components
Part Name Internal Element Function Where to Check Normal Status
Carriage motor
(1034)
4-phase stepping motor Head carriage
drive
Remove the cable connector
connected to CN7 on the
main circuit board. Test
between pin 1 and pin 3 and
between pin 2 and pin 4.
Approx. 7.2 Ω
(per 1 phase)
Receipt paper
feed motor
(1046)
4-phase stepping motor Receipt paper
feed
Remove the cable connector
connected to CN8 on the
main circuit board. Test
between pin 1 and pin 3 and
between pin 2 and pin 4.
Approx. 7.2 Ω
(per 1 phase)
Q1
CN8
CN7
CN6
Q7
U9
CN4
F3

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