4 - 2
Chapter 4 Disassembly / Assembly and Adjustments
4.1.1 Before starting service work
Start the procedure after turning off the power and removing the power cord from the outlet.
When performing the service operation around the FUSING UNIT, ensure that FUSING
UNIT and its surrounding area have cooled down sufficiently.
Pay sufficient attention to the parts during the procedure because they may be broken or may
not perform their functions properly if unreasonable force is applied.
Since various types of screws are used, ensure that the right screws are used in their right
positions.
Use special caution not to confuse the screws for plastic and the ones for sheet metal, because
using the wrong type of screw may result in damage to the screw threads or other troubles.
Wear a wristband or the like as far as possible to remove static electricity of the human body.
Keep the front cover closed. Buzzer goes off when the machine is left powered on with the front
cover open for five minutes or longer to prevent the drum deterioration due to exposure to
light.
When opening the front door in a removal/replacement operation, cover the drum to keep it
from being exposed to light.
Remove CASSETTE ASSY 250, PHD ASSY, TONER CARTRIDGE and FUSING UNIT, and
put them in a place where they do not affect the procedure. (Note that the service procedures
can be performed with those parts in place depending on the target section of removal/replace-
ment.)
No. Type Application Shape How to distinguish Points to be noted
Major
application
locations
1
Screw for
plastic
Silver, tap
Plastic
•Silver-colored
•Thread is
coarser than
that of the sheet
metal type.
•Screw tip is
thin.
Oblique screw-
ing damages the
thread because
this screw cuts
female threads in
the base material
as it goes in.
-
2
Screw for
plastic
Silver, tap,
with flange
Plastic
•Silver-colored
•It has a flange.
•Screw thread is
coarse
comparing to
the sheet metal
type.
•Screw tip is
thin.
As it has a func-
tion to cut the
thread by itself,
if the screw is
inserted in an
angle and tight-
ened, the screw
thread will be
damaged.
•FUSING
UNIT
3
Screw for
metal sheet
Silver
Sheet metal
•Silver-colored
•Diameter of the
thread section
is uniform.
-
4
Screw for
metal sheet
Silver, with
an external
tooth washer
Sheet metal
•Silver-colored
•Provided with
an external
tooth washer.
•Diameter of the
thread section
is uniform.
•Mounting
positions
of the
ground
wires.
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