Rev.D
Product Overview Appendix D-49
TM-U675/U675P (with autocutter) Service Manual
Confidential
Gate Array (GA)
The GA for this printer mainly consists of a custom IC with the following functions. The GA is
operated by external root oscillation (10 MHz).
❏
Impact head drive function
❏
General-purpose port and other functions
Table D-8 GA terminals and functions
Terminal
Name
Pin
No.
Description
Circuit Signal
Name
Spec.
Meaning
of H
Meaning
of L
DREQ
1
DMA request
DREQ
DREQ
CLKREQ
2
Synchronous serial
CLK_REQUEST
CLKREQ
CLKREQ
VDD1
3
Fixed power source
VCC
VCC
CLKIN
4
Synchronous serial CLKIN/DTR
CLKIN
CLKIN
TXD
5
Synchronous serial TXD
TXD
TXD
RXD
6
Synchronous serial RXD
RXD
RXD
SD_INT
7
Synchronous serial SD_INT
SD_INT
SD_INT
RTS
8
Synchronous serial RTS
RTS
RTS
PC7
9
Port PC/MSL1
MSL1
IN
Yes
No
PC6
10
Port PC/MSL2
MSL2
IN
Yes
No
PC5
11
Port PC/MSL3
MSL3
IN
Yes
No
PC4
12
Port PC/DSW2-1
DSW2-1
IN
DSW-OFF
DSW-ON
PC3
13
Port PC/DSW2-2
DSW2-2
IN
DSW-OFF
DSW-ON
PC2
14
Port PC/DSW2-3
DSW2-3
IN
DSW-OFF
DSW-ON
VSS1
15
Fixed power source
GND
PC1
16
Port PC/lever timing detector
LEVER_DT
IN
Light
received
Light
blocked
PC0
17
Port PC/HB-R cover
TH_R_COVER
IN
PG7
18
Port PG/F cover
F_COVER
IN
Open
Closed
PG6
19
Port PG/R cover/HB unit sensor
R_COVER
IN
Open
Closed
PG5
20
Port PG/AC reset detector
AC_RESET
IN
Stopped
Operating
PG4
21
Port PG/M190 reset detector
EP_RES
IN
Detected
PG3
22
Port PG/DSW2-6
DSW2-6
IN
PG2
23
Port PG/CR motor step-out
detector
CR_MOT_DT
IN
Light
blocked
Light
received
PG1
24
Port PG/CR motor HP detector
CR_MOT_HP
IN
Light
received
Light
blocked
SW24V1
25
24V enabler 1
24VSW1
OUT
24V
supplied
24V
interrupted
Содержание U675 - TM Color Dot-matrix Printer
Страница 2: ......
Страница 4: ...Confidential ii Revision Table ...
Страница 34: ...1 22 Troubleshooting Rev D Confidential ...
Страница 168: ...2 134 Assembly and Disassembly Rev D Confidential ...
Страница 180: ...Appendix A 2 Service Tools and Lubricants Rev D Confidential ...
Страница 270: ...Appendix D 82 Product Overview Rev D Confidential ...
Страница 322: ...Appendix J 2 Screw Types Rev D Confidential ...
Страница 324: ...Appendix K 2 Parts Layout Rev D Confidential Main Circuit Board Unit Solder Side memory board ...
Страница 325: ...SEIKO EPSON CORPORATION Printed in Japan EPSON ...