Rev. B
Mechanism Configuration and Operating Principles
TM-U200D/U200PD Technical Manual
9
P62
NE
I
TTL
Paper roll near-end detection Low: no paper
High: paper present
10
P63
DK S
I
TTL
Drawer open/close Low: open
11
P64
RE
I
TTL
Paper roll end detection Low: paper present
High: no paper
12
P65
HP DTC
I
TTL
Carriage Detector low: home position
13
P66
DET
I
TTL
Host interface DET
14
P67
AC RST
I
TTL
Auto cutter position detection (reset)
15
VCC
VCC
I
(+5V)
Main power terminal
16
P70
CTS
I
TTL
Host interface CTS Low: on
17
P71
CCE
O
TTL
4M ROM CE signal Low: active
18
P72/RXD1
RD
I
TTL
Host interface RD Low:on
19
P73/CLK1
CLK IN/DTR
I/O
TTL
Host interface CLK IN/DTR
20
P74/TXD1
SD
O
TTL
Host interface SD Low: on
21
RESET
RESET
I
---
CPU reset input Low: on
22
CLK
CLK
O
TTL
Not used. Open
23
VSS
VSS
I
(0V)
GND terminal
24
X1
X1
I
---
Connected to ceramic vibration generator.
f=14.74MHz ± 0.5%
25
X2
X2
O
---
Connected to ceramic. f=14.74MHz ± 0.5%
26
EA
EA
I
TTL
External memory access Low: external ROM
High: internal ROM (CPU mask)
27
P75
P75 (A16)
O
TTL
External memory address A16 (software)
28
P76
P76 (A17)
O
TTL
External memory address A17 (software)
29
P77
P77 (A18)
O
TTL
External memory address A18 (software)
30
P80
WDTOUT
O
TTL
Watch dog timer error (and hardware limited
time power supply switch) Low: error (reset)
31
P81/INT0
CLK IN/DTR
I
TTL
Connected to pin #19
32
P82
PF SW
I
TTL
Paper feed switch Low: active
33
ALE
ALE
O
TTL
Address latch enable signal
Latch address on the bus AD0 to AD7 at falling.
34
VCC
VCC
I
(+5V)
Main power terminal (+5V)
CPU pin functions
Pin
No.
CPU
Function
Signal Name
I/O
Level
Description
Summary of Contents for TM U200D - B/W Dot-matrix Printer
Page 2: ...technical manual TM U200D U200PD EPSON English 4005680 ...
Page 4: ...EPSON SEIKO EPSON CORPORATION Printed in Japan E9608130 0000SE ...
Page 145: ...Rev B Disassembly Assembly and Adjustment 5 49 TM U200D U200PD Technical Manual ...
Page 146: ...5 50 Disassembly Assembly and Adjustment Rev B ...
Page 147: ...Rev B Disassembly Assembly and Adjustment 5 51 TM U200D U200PD Technical Manual ...
Page 148: ...5 52 Disassembly Assembly and Adjustment Rev B ...
Page 154: ...Appendix A 6 Rev B Main Circuit Board A Parts Layout ...
Page 155: ...Rev B Appendix A 7 TM U200D U200PD Technical Manual Main Circuit Board C Parts Layout ...
Page 156: ...Appendix A 8 Rev B RS 232 Serial Interface Circuit Board Parts Layout ...
Page 169: ...Rev B A 21 TM U200D U200PD Technical Manual Case Unit Lubrication Points Diagram ...