HP LaserJet 4 Service Manual - Page 157
Caution, DRAWING, DESCRIPTION, PURPOSE, Table 6-2
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Table 6-2 describes the screws used in the printers, and provides guidelines to help determine where each type of screw is used. The screws can vary in length depending on the thickness of the material being fastened. Typically, plated screws are used in areas visible to the customer, and black screws are used in all other areas of the printer. Always note where each type of screw is located and replace each one into its original location. Table 6-2 Printer Hardware Descriptions DRAWING DESCRIPTION Threaded Phillips screw with lock and flat washer PURPOSE Used to fasten metal or plastic to threaded plastic or metal. Threaded Phillips washer head Used to fasten metal or plastic screw to metal when high torque is required. Threaded Phillips w/captive star washer Used to fasten metal to metal when good electrical contact is needed. Self-tapping Phillips screw Used to fasten metal or plastic to plastic mainframes. Caution To install a self-tapping screw, first turn it counter-clockwise to align it with the existing thread pattern, then carefully turn clockwise to tighten. Do not over-tighten. If a self-tapping screw-hole strips, repair of the screw-hole or replacement of the affected assembly is required. In the removal and replacement procedures that follow, the number inside the parentheses, such as (4), refers to the number of screws you must remove. Removal and Replacement 6-3