HP Color LaserJet CM4730 Service Manual - Page 160
Flash, Hard disk, CPU, FIH (foreign interface harness), MFP memory, Read-only memory
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Flash Optional flash is available in 4 MB flash memory DIMMs for storing forms, fonts, and signatures. Hard disk The hard disk is mounted in an EIO slot on the formatter. The hard disk is used to create multiple original prints (mopies) and store forms, fonts, and signatures. CPU The HP LaserJet CM4730 MFP formatter incorporates a 533 MHz RISC processor. FIH (foreign interface harness) The FIH allows connection to third-party devices, such as copy counters and biometric security devices. MFP memory If the MFP encounters difficulty managing available memory, a clearable warning message will appear on the product control panel. Some MFP messages are affected by the auto-continue and clearable warning settings from the Administration menu, under Device Behavior, Clearable Warnings. If Job is set on the product control panel, warning messages appear on the control panel display until the end of the job from which they were generated. If On is set, warning messages appear on the control panel until OK is pressed. If an error occurs that prevents printing and Autocontinue Off is set, the message appears until IGNORE is touched. Read-only memory Besides storing microprocessor control programs, the read-only memory (ROM) stores dot patterns of internal character sets (fonts). Random-access memory The random-access memory (RAM) contains the page, I/O buffers, and the font storage area. It stores printing and font information received from the host system, and can also serve to temporarily store a full page of print-image data before the data is sent to the print engine. Memory capacity can be increased by adding DIMMs to the formatter. Note that adding memory (DIMMs) might also increase the print speed for complex graphics. DIMM slots The DIMM slots can be used to add memory, fonts, or firmware upgrades. Flash memory To upgrade MFP firmware, upload a new firmware image to the MFP. 140 Chapter 4 Theory of operation ENWW
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