Read Sharp ER-A440 (serv.man4) Service Manual online
2) Block diagram
Fig. 2-4
MTD
MTD
RJMTR
SLMTD
SLMTS
SLMTR
SLMTD
TXDI
SCKI
RXDI
HTS1
SCK1
STH1
HTS2
SCK2
STH2
ROS1
ROS2
RAS1
RAS2
RAS3
OPTCS
AS
RD
WR
RDO
WRO
Φ
RESET
RES
VRESC
POFF
MD0
MD1
MD1
WAIT
RJRST
SLRST
*PRST
RJTMG
SLTMG
PTMG
INT4
INT1
INT2
INT3
EXINT0
EXINT1
EXINT2
EXINT3
SD
T1
~7
T1
~7
DT
1
1
~
9
TEST
IRQ0
A23~A0
SSPRQ
SL
F
F
SL
R
R
S
VF
RF
JF
F
CUT
PC
U
U
T
STAM
P
TR
G
G
I
TR
G
G
TR
G
G
DO
T
T
E
N
IRLON
D0~D7
Φ
Address decode
External CS
Internal CS
Internal CS
RASEL
Image
control
Image
control
SSP comparison register
BAR.
Buffer
Read/write
control
control
Divider
CHS
serial select
serial select
Multiplexer
WAIT
control
control
CAPS
select
select
Print gate
Print pulse control
Print mode PMD
INTO
control
control
Printer control port
Motor
drive
drive
* Output selection with CAPS.
PRST/PTMG.
PRST/PTMG.
EXWAIT
I/R Control
IRTX
IRRX
RCI
ASKRX
4 – 6
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