Service manual

Samsung Electronics 5-1
5. CIRCUIT
5-1 MAIN PBA
5-1-1 SUMMARY
The main circuit that consists of CPU, MFP controller (built-in RISC processor core:
ARM7TDMI) including various I/O device drivers, system memory, scanner, printer,
motor driver, PC I/F, and FAX transceiver controls the whole system. The entire
structure of the main circuit is as follows:
Fig.5-1-1. Entire Structure of Main Circuit for Each Key Signal
LIU-TXD
MCLK(30MHz)
/POR
/ROMCS
/RD, /WR
D0~D15
D0~D15
D0~D7
A0~A17
A0~A9
A0~A4
/RST-OUT
PD0~PD7
/P-ERROR
/P-PE
/P-BUSY
/P-ACK
/P-SLCT
/P-INIT
/P-STB
245DIR
/P-SLCTIN
/P-AUTOFD
/MCS
/MIRQ
/RD, /WR
/RASO, 1
/WR
/UCAS,
/LCAS
/F-POR
LIU-RXD
IP-CLK
/XDACK
/XDREQ
/IP-CS
/RD, /WR
D0~D15
A0~A4
LFPHA
MFP CONTROLLER
(KS32C6200)
LFPHB
LFIA0
LFIA1
LFIB0
LFIB1
CR-REF
CRPHA
CRPHB
CRIA0
CRIA1
CRIB0
CRIB1
/HEAD-EN
HEAD-DATA
/HGA1~/HGA13
HOE1~HOE16
OK2PRINT
/FAULT-TEST
BIASOFF
/RST-OUT
/RST-OUT
LIU (STI9510)
COKOR IMAGE
PROCESSOR
FLASH
MEMORY
DRAM
MODEM
PARALLEL
INTERFACE
(IEEE1284)
LF MOTOR
DRIVER
CR MOTOR
DRIVER
PRINT HEAD’
DRIVER &
PRINT
CONTROL
CIRCUIT