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.
Host interface circuit
The printer has universal interfaces for connection to the host computer. There are three kinds of
interfaces:
❏
EIA/TIA RS-232 intrface
❏
IEEE 1284 interface
❏
EIA/TIA RS-485 interface
See the interface circuit board diagrams in the Appendix.
Drawer kick-out drive circuit
Activating the DKD1 and DKD2 signals from the CPU (U5) causes transistors Q29 and Q30 to
turn on. This causes transistor array QM5 to turn on, and the drawer drive signal is output. The
drawer status signal DK_S, which indicates whether or not the drawer is open, is input to the
CPU (U5), allowing the host to check the status via the interface.
Figure 2-22 Various detector circuits
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
1
GND
+5V
R.E
H.P
N.E
GND
Printer mechanism
+5V
2
2
— 47 —
Summary of Contents for UP-250
Page 1: ...EXTERNAL PRINTER FEB 2000 MODEL UP 250 without price TECHNICAL MANUAL ...
Page 95: ... 86 END END Yes No Action 4 Replace main PCB Replace printer OK Action 4 mechanism assembly ...
Page 136: ... 127 ...
Page 149: ... 140 Main Circuit Board Parts Layout ...
Page 150: ... 141 RS 232 Serial Interface Circuit Board Parts Layout ...
Page 151: ... 142 IEEE 1284 Parallel Interface Circuit Board Parts Layout ...
Page 152: ...RS 485 Serial Interface Circuit Board Parts Layout 143 ...
Page 160: ... 151 Case Unit Lubrication Points Diagram 4 G 31 4 G 31 3 G 31 3 G 31 ...
Page 163: ... 154 EXPLODED DIAGRAM FOR TM U200B U210B NO 1 ...
Page 164: ... 155 EXPLODED DIAGRAM FOR TM U200B U200PB U210B U210PB NO 2 ...