Xerox ii LINXSolid Inkjet 100 Service Manual page 76

Power Control Board
The power control board functions as a back plane. This circuit board
is the point of electrical interface to the print head, main controller,
optional Ethernet Interface card, internal hard disk drive, I/O boards.
and power supply. The PCI bus signals supporting the optional
Ethernet Interface card and internal disk drive are sourced from the
image processing controller and are routed to the option slots on the
power control board. Two optional PCI based boards: optional
Ethernet Interface and Internal Disk Drive are available and plug
into the power control board (back plane). Only one Ethernet
interface is supported at a time. If an optional Ethernet Interface card
is plugged into the printer, the printer's on-board 10 Base T Ethernet
is disabled.
Main Board
The power control board contains all of the motor power drivers with
actual control for the drivers located on the main controller. Switching
for all heaters is contained in the power supply.
The main controller, or processing controller, uses a Motorola
PowerPC 603e running at a nominal bus frequency of 32 MHz. The
603e PLL is configured for 4:1 operation resulting in a CPU frequency
of 128 Mhz. DRAM is interfaced with a 64 bit bus and the PCI bus is
32 bits wide running at 33 MHz. Other interfaces in addition to PCI
bus are parallel port, serial port, and USB device side port.
There are two dram (SDRAM) DIMM sockets on the board. These will
accommodate industry standard 64 MB SDRAM modules up to a total
of 128 MB.
There is one 168 pin DIMM socket for ROM/FLASH on the main
controller. The interface to the controller is 64 bits.
Four DIP switches are located on the rear panel and from left to right
are: Service Mode 3. Service Mode 2, Service Mode 1 and System
Reset. The Three service Mode switches are defined by software and
the System Reset is hardwired. After initialization both the
PostScript and Engine LEDs blink to indicate normal operation. The
Postscript and Engine LEDs are located to the left and right of the
DIP switch respectively.
The Ethernet connector contains two integral LEDs. The yellow
indicates transmit and green indicates receive.
The image processing controller contains an on-board Digital
Semiconductor 21041-AB 10 Base T Ethernet port located at JR160.
The controller's built-in Ethernet interface will support 10Mbit half-
duplex Ethernet connections over category 3 (or higher) twisted pair
cable and is automatically disabled when the optional 100 base T
interface is installed.
Both the IEEE 1284 parallel port and the serial ports are
1-76 ii LINX™ Solid Inkjet 100 Service Manual