Epson TM-U200 Series, Техническое руководство

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2-24 Mechanism Configuration and Operating Principles Rev. A
C o n fid e n tia l
Various detector circuits
When the printer detects paper, the paper detector at the paper inlet turns the input signal to the
CPU (U5) LOW. This detector also functions as the semi-automatic loading detector.
A home position sensor is provided to detect the print head position. The input signal to the
CPU (U5) becomes LOW when home position is detected.
A near-end detector is an option that detects the remaining amount of a paper roll. The input
signal to the CPU (U5) becomes LOW when a paper near-end is detected.
Figure 2-23 Various detector circuits
Host interface circuit
The printer has universal interfaces for connection to the host computer. There are three kinds of
interfaces:
❏
EIA/TIA RS-232 interface
❏
IEEE 1284 interface
❏
EIA/TIA RS-485 interface
See the interface circuit board diagrams in the Appendix.
4
3
1
2
CN8
4
2
3
1
1
2
2
1
CN11
R40
R37
R39
R16
R36
R38
C23 C22 C46
R53
Mechanism 1
Mechanism 2
C44
+5V +5R
GND
NEC
HPC
REC
NE
HP DET
RE
P62/AN2
12
P64/AN4
9
11
P65/AN5
U5
1 2
1 2
GND
+5V
R.E
H.P
N.E
GND
Printer mechanism
+5V