Read Sharp AR-BD14 (serv.man5) Service Manual online
B. Program memory section (EPROM)
The EPROM has the capacity of 1MB (4Mbit
×
2) and stores various
set values of the program and the printer.
ROM Block (EPROM & Flash ROM)
C. Flash memory section (Flash ROM)
The flash ROM has the capacity of 8MB (16Mbit
×
4), and stores the
program codes and font data used by PS/PCL.
D. Image development memory section (DRAM)
The built-in DRAM has the capacity of 16MB (16Mbit
×
8), and is
used as the image data development area for printing and the work
area for the program.
area for the program.
For expansion, one slot area is provided to allow connection of 72 pin
SIMM memory (16MB).
SIMM memory (16MB).
DRAM Block
E. Centronics interface section
The Centronics interface section is composed for supporting the con-
ventional compatible mode and the nibble mode.
ventional compatible mode and the nibble mode.
Centronics I/F Block
CPU
R3081
GT-32011
373
245
SEL
System-Bus
Address-Bus
ALE
Data-Bus
/OE
/ROMCS2
/WE
/CE
/CE
/FLASH_WE
EPROM
1MB
32bit-width
Flash-A
4MB
32bit-width
Flash-B
4MB
32bit-width
G/A
LZ95NA8
A22
GT-32011
245
System-Bus
DRAM-Address (10:0)
Data-Bus
/OE
827
/RAS0
/RAS1
/RAS2
/RAS0A
/RAS1A
/RAS1B
/CAS0,1,2,3
EPLD
CE16V8
CPU
R3081
DRAM
16MB
32bit-width
SIMM
1slot
16MB
32bit-width
GT-32011
373
System-Bus
16bit I/O bus (7:0)
ALE
/IOGPCS0
G/A
LZ95NA8
52BT
245
Parallel
I/F
CD7:0
244
244
SELECT
ERROR
BUSY
/ACK
/STROBE
/AUTOFD
/AUTOFD
/SELIN
/INIT
/CS
A23,22,21
IDT
R3741
CPU
R3081
– 32 –
Click on the first or last page to see other AR-BD14 (serv.man5) service manuals if exist.