Xerox Phaser 3450, Руководство по обслуживанию, Страница: 20 / 155

4-8
Summary of Product
Service Manual
4.2.2. Memory part
>> Flash Memory
It stores the System Program.
• Capacity : 2M Byte
• Access Time : 70 nsec
>>SDRAM
It is used as Swath buffer, System working memory area, etc. when printing. It stores the font list, compressed into
flash memory, on DRAM and uses it as PCL font.
• Capacity : 16M Byte (Basic), upto 144M Byte (Option)
• DIMM : 16MB / 32MB / 64MB /128MB
• Type : SDRAM 100MHz/133MHz , 16bit
>>ROM DIMM
It supports the option ROM DIMM 1 Slot for supporting the Postscript level 3.
• Capacity : 4MByte
• Access Time : 70nsec
4.2.3. RESET Circuit
After printer power is ON and 50~200 ms are passed, the reset signal from RESET IC (XC61FN3112MR) resets various
IC such as the CPU, Memory, etc. to prevent malfunction of the set by setting the initial value of port.
4.2.4. ClOCK Circuit
Basically, it consists of the Crystal (12MHz) and Capacitor (27pF) which is connected to the crystal in parallel, and it is
inputted to the MCLLK_Signal via the FS781. The purpose of the adding FS781 is substitution of EMI.
4.2.5. INTERFACE Part
>>IEEE1284
It supports the IEEE 1284 B Type Connection, and the protocol supports the IPP, ECP, Compatibility, Byte, and Nibble
mode.
>>USB2.0
USB2.0 Compliant, 12Mbps 1 port
>>Network
• Option : Ethernet 10/100 Base TX
• Protocol : SPX/IPX, TCP/IP,Appletalk, SNMP, HTTP 1.1, DLC/LLC
>>Panel
• LCD : 16Char. * 2 Line / Back-light(Blue)
• Key : 9 Key
• LED : 3 LED
The UART method is used for the controller and panel interface, and the HR 48R50 Holtak Micom is used