HP 2200 Service Manual - Page 92

Memory management This printer uses various methods to conserve and make the most of available memory. Several of these methods are explained below. Memory Enhancement technology (MEt) MEt enhances the printer's standard memory through a variety of font and data compression methods. MEt also automatically compresses fonts for desktop publishing applications. MEt is available in all printing modes (PCL 5e, PCL 6, and HP PS emulation). When printing graphics, MEt analyzes each page as it is being printed and automatically applies a variety of compression techniques to print the complete page at the correct resolution. Image Adapt Image Adapt uses a compression technique to allow printing of full-page graphics using the printer's base memory. Image Adapt is only used in PCL 5e (PCL 6 and HP PS emulation do not require Image Adapt). The available settings are auto, on, and off. The default is auto. If Image Adapt is used some data might be lost. To see if there has been some loss of graphic detail, print a self-test page and check the Image Adapt Used line in the Printer Information section. If the printer invoked Image Adapt since the last time the self test was printed (or the last time the printer was turned off and on), that line reads "Image Adapt Used: Yes." Page Protect A page's complexity (rules, complex graphics, or dense text) might exceed the printer's ability to create the page image fast enough to keep pace with the engine's printing process. If a page is too complex, it might print in parts (for example, the top half of data on one page and the bottom half on the next page). Some print data loss is likely in these instances, and the printer's Attention light flashes. Page Protect allows the formatter to create the entire page image in memory before moving the paper through the printer. This process ensures that the entire page is printed. The default is off, which provides the best performance. Page Protect should only be enabled when necessary. Printer Job Language overview Printer Job Language (PJL) is an integral part of the printer's configuration, in addition to the standard Printer Command Language (PCL). PJL allows the printer to perform functions such as: l Two-way communication with the host computer through an IEEE1284 B interface connection. The printer can tell the host such things as the control panel settings and allow the control panel settings to be set from the host. l Dynamic I/O switching allows the printer to be configured with a host on each I/O. The printer can receive data from more than one I/O simultaneously until the buffer is full. This can occur even when the printer is offline. l Context-sensitive switching allows the printer to automatically recognize the personalities (PS or PCL) of each host and configure itself to serve that personality. l Isolating print environment settings from one print job to the next. For example, if a print job is sent to the printer in landscape mode, subsequent print jobs only print in landscape if they are formatted for landscape printing. For more information, see the HP LaserJet 2200 Series Printer Software Technical Reference. The complete PJL Status Code listing is contained in the appendix of the Printer Job Language Technical Reference. Also see HP's website at www.hp.com. 76 Chapter 5 Theory of operation C7058-90936