Xerox 2135DT Service Guide - Page 17
Printer RAM and printer capabilities, CRC life counter behavior
UPC - 042215474696
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Printer RAM and printer capabilities The printer features three DIMM connectors which accept 64-, 128-, and 256-Mbytes RAM DIMMs. The printer can use off-the-shelf RAM meeting these specifications: s 168-pin DIMM s Synchronous DRAM s 3.3 volt s 9 nsec speed s Valid on-board Serial Presence Detect ROM. The Startup page and the Configuration Page list the amount of RAM installed in the printer. If the DIMM does not meets the system controller board's specifications, then the printer reports an "Invalid Memory DIMM Configuration" message and stops the booting process. If the power-up self-test diagnostics detect a DIMM with defective memory cells the printer declares "Diagnostics Failed - Press Enter to Continue." After the enter key is pressed the boot process continues and the defective RAM DIMM is ignored. Note that a seriously defective RAM DIMMs (with grounded address lines, for example) can keep the system controller board from booting up at all. With more memory the printer gains the capabilities of printing without having to use image compression (which trades less installed RAM for longer image processing time) and dual frame buffers for printing one image while processing a second image (which gives greater printing throughput). The printer features three slots each of which can contain a 64-, 128-, or 256-Mbytes SDRAM DIMM. Any slot may be used for any size DIMM. DRAM memory totalling beyond 512 Mbytes will be ignored. For a capacity of 512 Mbytes, 256-Mbyte DRAM DIMMs cannot be mixed with 128-Mbyte RAM DIMMs. The image-processing controller board also contains 16-kbytes of non-volatile memory (NVRAM), to store all for the necessary values that can be set on the printer. CRC life counter behavior Internal counters track customer replaceable consumable (CRC) life usage and store the values in NVRAM. The controller monitors these counters in order to display the near end-of-use and end-of-use messages. The toner states displayed are OK, Low, and Empty, where the engine senses and automatically reports the Low and Empty states. When the empty state is reached for toner, the printer terminates printing at the end of current page and displays the appropriate message on the control panel. No further jobs are accepted from any input port. All printer CRCs wait for the current print job to finish before declaring a Low or Empty state. 4 Phaser 2135 Color Printer