Epson TM-U375 - Installing the Ribbon Cassette

1-9
1.3.2 Main Unit Specifications
■ Paper feed motor
Paper roll and cut sheet are fed by using the common paper
feed motor.
Motor type
4-phase, 48-pole PM type stepping motor
Drive voltage
24 V DC ± 10% (including voltage drop caused by the
drive transistor)
Winding resistance
40 Ω ± 5% at 25˚C (77˚F), per phase
Current consumption
Peak current: 1.1A in worst case
Average current: 270 mA at rated speed, 24 V DC,
25°C (77°F), 770 PPS
350 mA or less in worst case
Hold current 36 ± 6 mA (18 mA per phase)
■ Carriage motor
Motor type
4-phase, 48-pole PM type stepping motor
Drive voltage
24 V DC ± 10% (including voltage drop caused by the
drive transistor)
Winding resistance
30 Ω ± 1.5 Ω at 25°C (77°F), per phase
Current consumption
Peak current: 1.9 A in worst case
Average current: 370 mA at rated speed, 24 V DC, 25°C
(77°F), 952 PPS
450 mA or less in worst case
Drive frequency
952 pps (pulse interval of 1050
+40
µs)
Drive principle
Constant-current chopper drive, 2-2 phase induction
■ Print head unit (print solenoids)
Number of solenoids
9
Drive voltage
24 V DC ± 10%
DC resistance
15.6 Ω ± 7% at 25°C (77°F)
■ Paper roll near-end sensor
A sensor is provided for the paper roll. This sensor checks
the diameter of the roll and activates the near-end alarm
when the diameter falls below a user-determined value.
Sensor type: Microswitch
Voltage: 5 V DC ± 5%
Output level: High when a paper near-end is detected
■ Cut sheet sensor (TOF/BOF sensor)
This sensor is installed in the cut sheet path. It detects
insertion and ejection for slip paper and insertion for valida-
tion paper. This sensor also detects the presence of a cut
sheet in the paper path.
Sensor type: Photosensor
Voltage: 5 V DC ± 5%
Input current: Approx. 20 mA
Output level: Low when a cut sheet is detected
■ Cover-open sensor
This sensor detects the state of the printer cover. If the
cover is open, the printer automatically goes off-line after
printing the current line, and the carriage returns to the
home position. The printer goes back on-line when the
cover is closed.
Sensor type: Photosensor
Voltage: 5 V DC ± 5%
Input current: 10 mA
Output level: High when a cover open is detected
■ Home position sensor
This sensor detects the initial position of the carriage and
whether carriage operation is abnormal.
Sensor type: Photosensor
Voltage: 5 V DC ± 5%
Output level: High when the carriage home position is
detected
■ Carriage motor out-of-phase state sensor
This sensor outputs a signal synchronized with carriage
operation, and detects whether carriage operation is ab-
normal.
Sensor type: Photosensor
Voltage: 5 V DC ± 5%
Output level: Low when the sensor plate is detected
1.3.3 Connectors
All connectors are located on the rear panel of the printer.
(Refer to Figure 1-1.)
Figure 1-15. Rear Panel Connectors
– 0
1
14 25
13
1
6
1
2
3
1
8
Customer display
connector
Interface 
connector
Drawer kick-out
connector
Power 
supply
connector
CONFIDENTIAL