Xerox Phaser 3425, Service Manual

Page: 42 / 180

2-8 Phaser 34 25 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.
Main Board Wiring Diagram
ADDR(1: 23)
29L V160
16Mbit Flash
M emory
Mask Font ROM
ROM
nFSYNC
ACK* ,BU SY,
SELECT ,ERROR,
FAULT *
SELIN*
ST ROBE*
AUT OFD*
INI*
PD(0:7)
EIRQ(0:3)*
4
nIOCS(0:5)*
6
RCS(0:3)
4
nWAIT
nWR
INT *
nRD
Cent ronic s
Connec tor
PANEL 5Pin
6
HVPS Int er face
24
16
Power Supply Board
100PI N DI MM
L CD Panel
6
0
P
in
N
et
w
o
rk
C
o
nn
e
c
to
r
NIC
Card
DATA(16:31)
nWAIT
nRD
nWR
NPC_RESET
IOCS
EIRQ
Computer
Sy s tem c lock
12M Hz(X- t al)
FS781
Fr equenc y
Scaling EMI
Attenuator
RESET *
XC61FN 3112M R
DA TA (16:31)
Video- Clock
78 MHz
VCLK*
32
Memory Data Bus
11
Memory Address Bus
14
SDRAM _CA S,SDRAM_RAS,
BA0*,BA1* ,SDRAM_WE* ,
SDRAM _CS(0:1),SDQM (0:3),
SD_CLK (1:2),CL KE
64Mbit SDRA M
K 4S641632C
SDRA M
64Mbit SDRA M
K 4S641632C
DRAMA(0:11)
DRAMD(0:31)
100PI N DI MM
74ACT 245
T r ansceiv er
3
Laser
LREADY* ,,LSYNC* ,VDO*,P_MOT * ,CLK
UART
12
Regulat or
1.8V
USB c loc k
12MHz(OSC)
93C66
4M bit
Serial
EEPR OM
ADDR(1:13)
Main
Board
-