HP LaserJet 4 Service Manual - Page 60
Understanding the PCL Self Test, Printout
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Understanding the PCL Self Test Printout (Refer to Appendix B for LaserJet 5 information.) Table 3-10 Self Test Printout Items for the HP LaserJet 4/4M Item Figure 3-3 Explanation 1 Standard Menu Selections: Shows standard menu selections, such as Printing Menu and PCL Menu, and menu items, such as Copies and MP tray, in the order they appear in the control panel display. 2 Optional Menus: Shows optional menu selections, such as the PostScript Menu and MIO Menu, and menu items, such as PRT PS ERRS, in the order they appear in the control panel display. An optional menu automatically is added to the control panel display and Self Test printout after the option is added to the printer. 3 MIO Menu: Once a Modular I/0 is added, it appears after the Serial Menu in the control panel display and in the Self Test. 4 MIO Information: Reserved for MIO and Network statistics. Note that for some installed MIO options, this block of information can take up to 20 lines and three columns. 5 Formatter Number: Shows the printer's unique formatter number. 6 RAM Size: Shows the total amount of installed printer memory, including added optional memory. Two MBytes of installed memory is standard with the printer. If you install optional memory, a self test can be used to verify proper installation. 7 Page Count: Shows how many pages were printed. You can use the page count to track printer use. The page count is always updated. 8 Datecodes: Eight-digit dates (YYYYMMDD) indicating when the formatter firmware and internal typefaces were last revised. This information may be of use to a service technician. 9 Other Installed Options: Use this area of the self test to verify the installation of typeface cartridges, paper trays, and other installed options. 10 Resolution Enhancement: The REt pattern only appears when the printer is in 600 dpi mode. The REt pattern varies with the RET setting. To optimize REt, adjust REt and density settings to minimize the appearance of vertical lines through the block. 11 Print Pattern: Use the text print pattern to check print density and quality. 3-24 Configuration