Circuit Description; Main Pba - Xerox WorkCentre 385 Service Manual

Circuit Description

Main PBA

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 driver, PC
I/F, and FAX transceiver controls the whole
system. The entire structure of the main circuit is
as follows:
WorkCentre 385
LIU_TXD
LIU (STI9510)
LIU_RXD
OPE_TXD
OPE (Z8601)
OPE_RXD
/RST_OUT
/XDACK
/XDREQ
/SDIPCS
SCAN
/RD, /WR
IMAGE
PROCESSOR
D0-D15
A0-A5
/CBSY
/EBSY
/EXITP
/EMSG
/PRINT
ENGINE
CCLK
PBA
EVIDEO
/READY
/PSYNRQ
/HSYNC
/CMSG
FIG. 7-1: ENTIRE STRUCTURE OF MAIN CIRCUIT FOR EACH KEY SIGNAL
12/98
www.printcopy.info
7 - 7
RTC_EN
RTC_CLK
RTC_DATA
/FMEM_CS
/RD, /WR
D0-D31
A0-A18
/RD, /WR
D0-D7
A0-A14
/CASO-3
MFP CONTROLLER
(KS32C6100)
/RASO, 1
DWE
D0-D31
A0-A9
/MCS
/MIRQ
/RD, /WR
D0-D7
A0-A4
/RST_OUT
PPD0-PPD7
/MC_FAULT
MC_PERROR
MC BUSY
/MC ACK
MC_SELECT
/PP_INT
/MC_SELECT
/PP_AUTOFD
/PP_STROBE
MCLK(66MHZ)
/POR
RTC
FLASH
MEMORY
SRAM
DRAM
MODEM
PARALLEL
INTERFACE
(IEEE1284)
Circuit Description