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134 Removing and replacing parts Q2431-90912
Screws used in the printer
This table describes the screws used in the printer 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 that is being fastened.
Always note where each type of screw is located and replace each one in its original location.
Hint When you are disassembling the product, place the screws into the chassis holes from which they
were removed. This prevents their loss, and ensures that the proper type and length of screw for
each location is used when the product is reassembled.
Table 36. Common fasteners used in this product
Drawing and description Purpose
Phillips machine screw with captive star washer
This screw is used to fasten metal
to metal when good electrical
contact is needed. This screw
also provides high resistance to
loosening.
Phillips screw with self-tapping threads
This screw is used to fasten sheet
metal or plastic to plastic frames
(the deep, coarsely spaced
threads provide an increased
holding capability while
decreasing the possibility of
stripping the target hole).
Reinstal note: To install a self-tapping screw, first turn it counterclockwise to align it with the existing
thread pattern, and then carefully turn it clockwise to tighten it. You will feel resistance and hear the screw
click when it engages the existing threads in the hole. Do not overtighten the screw. If a self-tapping screw-
hole becomes stripped, repair the screw-hole or replace the affected assembly.
Phillips washer-head machine screw with a broad, flat
washer attached to the screw head
This screw is used to fasten sheet
metal parts to the sheet metal
chassis. It spans large clearance
holes and distributes the load by
increasing the bearing surface.
Screw measurement guide