User Guide

Screws used in the printer
This table describes the screws that are 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.
NOTE 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 6-1 Common fasteners used in this product
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).
Reinstallation 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
170 6 Removing and replacing parts