Power Supply Board; Main Board Wiring Diagram - Xerox 3450B - Phaser B/W Laser Printer Service Manual

Image Processor Function
The host computer connects to the Main Board using a bi-directional parallel or
Universal Serial Bus (USB) cable, or via an optional RJ45 Ethernet Network Card.
The Main Board receives image data from the host computer and converts the image
to a bitmap image. It then sends the current image to the Laser Scanner assembly.
ROM
100PI N DI M M
29L V160
16Mbit Flash
M emory
Mask Font ROM
SDRA M
100PI N DI M M
64M bit SD RA M
K 4S641632C
64M bit SD RA M
K 4S641632C
XC61FN 3112M R
74A CT 245
Cent ronic s
T r ansceiv er
Connec t or
Co mputer

Main Board Wiring Diagram

2-8
DA T A (16:31)
AD DR(1: 23)
4
RCS(0:3)
M emory Data Bus
32
DRA MD(0:31)
M emory Address Bus
DRA MA (0:11) 11
SDRAM _CA S,SDRAM_RAS,
BA0*,BA1* ,SDRAM_WE* ,
SDRAM _CS( 0:1) ,SDQM (0:3) ,
SD_CLK (1:2) ,CL KE
14
4
EIRQ(0:3)*
6
nI OCS(0:5)*
RE SET *
A CK* , BU SY,
SELE CT , ERROR,
FA ULT *
PD(0:7)
SELI N*
ST ROB E*
A UT OFD*
I NI *
H VPS Int er face

Power Supply Board

FS781
Fr eq ue nc y
Sca lin g E MI
Main
A t t en uat o r
Board
nFSYNC
V CLK *
nWA I T
nWR
nRD
I NT *
3
93C66
4M bit
Serial
EEPR OM
LREA DY* , ,LSY NC* , V DO* , P_MOT * ,CLK
6
U ART
24
PAN EL 5Pin
16
L CD Pane l
Phaser 3450 Laser Printer Service Manual
Regulat or
1.8V
U SB c loc k
12M H z(OSC)
Sy s tem c l ock
1 2M Hz( X- t al )
V id eo- Clo ck
78 M Hz
A DDR(1:13)
DATA(16:31)
nWAI T
nRD
nWR
NPC_RE SET
I OCS
EI RQ
12
NIC
Card
Laser
s3450-166