Screws that are used in the MFP
The following table describes the screws that are used in the MFP 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.
NOTE When you are disassembling the MFP, place the screws into the chassis holes from
which they were removed. This prevents their loss, and ensures that the correct type and
length of screw for each location is used when the MFP is reassembled.
Table 6-1 Common fasteners used in this MFP
Drawing and description Purpose
Phillips-head 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-head 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).
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
146 6 Removal and replacement
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