Epson TM-U220 Series

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