Samsung SF-4500 Service Manual page 32

6. Circuit
6-1 Main PBA
6-1-1 Summary
The main circuit that consists of CPU, MFP
controller (built-in 32bit RISC processor core:
ARM7TDMI) including various I/O device
drivers, system memory, scanner, printer, motor
MA0~MA14
/WE
SRAM
/OE
MD0~MD7
TMPHA
TMPHB
TMIA0
TX MOTOR
TMIA1
DRIVER
TMIB0
TMIB1
OK2PRINT
HOME _ SEN
/P _ EXIT
P _ EMPTY
/RING _ DET
/HOOK _ OFF
RY _ BYN
ADCIN
CIS _ CLK
CIS
CIS _ SH
VREFDAC
VREFADC
THM _ DATA
THM _ CLK
/SPK _ CLK
VOL0
VOL1
VOL2
CMLON
CIS _ SH
CLK _ SEL
PRE _ HEAT
RTC _ EN
GLED
RLED
BLED
Samsung Electronics
OPE (Z8601)
LIU (STI9510)
/RST-OUT
LF MOTOR
DRIVER
SCAN
IMAGE
CR MOTOR
PROCESSOR
DRIVER
/RST-OUT
PRINT HEAD
DRIVER &
PRINT
CONTROL/
CIRCUIT
Fig.6-1-1. Entire Structure of Main Circuit for Each Key Signal
driver, PC I/F, and FAX transceiver controls the
whole system. The entire structure of the main
circuit is as follows:
OPE-TXD
OPE-RXD
LIU-TXD
LIU-RXD
IP-CLK
/XDACK
/XDREQ
/IP-CS
/RD, /WR
D0~D15
A0~A4
/TX-INT
LFPHA
LFPHB
LFIA0
LFIA1
LFIB0
LFIB1
MFP
CONTROLLER
CR-REF
(KS32C6200)
CRPHA
CRPHB
CRIA0
CRIA1
CRIB0
CRIB1
/HEAD-EN
HEAD-DATA
/HGA1~/HGA13
HOE1~HOE16
OK2PRINT
/FAULT-TEST
BIASOFF
MCLK(30MHz)
/F-POR
/POR
/ROMCS
/RD, /WR
FLASH
D0~D15
MEMORY
A0~A17
/UCAS,
/LCAS
/RASO, 1
/WR
DRAM
D0~D15
A0~A9
BACK-UP
CIRCUIT
/RD/WR
D0~D7
A0~A14
/MCS
/MIRQ
/RD, /WR
MODEM
D0~D7
A0~A4
EE DATA
EE CLK
/RST-OUT
PD0~PD7
/P-ERROR
/P-PE
/P-BUSY
/P-ACK
PARALLEL
/P-SLCT
INTERFACE
/P-INIT
(IEEE1284)
/P-SLCTIN
/P-AUTOFD
/P-STB
245DIR
RY _ BYN
SRAM
RTC
6-1