Canon iR5055, Service Manual

Page: 215 / 646

Chapter 7
7-31
- 1 screw [1]
2) Detach the cover while pulling the separation claw holder [4] toward the
front.
- 2 screws [3]
F-7-95
Be careful not to break the separation claw.
7.10.19 Potential Sensor Unit
7.10.19.1 Outline
0015-4943
iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N
The potential sensor unit includes the following 4 parts:
- Potential control PCB
- Potential sensor
- Potential sensor relay harness (between the relay connector and the
potential control PCB)
- Potential sensor harness (between the potential sensor and the relay
connector)
Be sure to replace them at the same time.
7.10.19.2 Before Removing Potential Sensor Unit
0015-6700
iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N
1) Detach the front cover.
(page 10-13)
Reference[Removing the Front
Cover]
2) Detach the toner supply cover.
(page 10-14)
Reference[Removing the
Toner Supply Cover]
3) Remove the primary fan duct.
(page 10-29)
Reference[Removing Prima-
ry fan Duct]
7.10.19.3 Removing Potential Sensor Unit
0015-4952
iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N
1) Remove the potential sensor unit [3].
- 1 connector [1]
- 1 screw [2]
- Cable (free from the cable guide)
F-7-96
7.10.20 Charging Wire
7.10.20.1 Outline
0015-9965
iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N
The photosensitive drum is surrounded by 3 charging wires; the primary
charging wire, the pre-transfer charging wire, and the transfer/separation
charging wire.
These charging wires are newly adopted brown wires (0.06 mm in diameter).
Do not use a gold-plated wire that has been used in the past; otherwise, image
fault may occur.
Further, be sure to use a strengthened polishing pad (in a blue holder) as the
cleaning pad for the primary charging assembly and the transfer charging as-
sembly.
7.10.20.2 Routing Charging Wire
0015-9967
iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N
All charging wires (except the grid wire) are routed more or less in the same
way; the following cites the primary charging assembly.
1) Remove the shield plates (left, right) of the charging assembly. To prevent
deformation (deflection) in the primary charging assembly, be sure to
work separately for the left shielding plate and the right shielding plate
(do not loosen the screws [1] of both shielding plates at the same time.)
2) Remove the wire cleaner.
F-7-97
For other charging assemblies, remove the 2 covers.
3) Free a length of about 5 cm of the charging wire (0.06 mm in diameter)
from the charging wire reel, and form a loop at its end with a diameter of
about 2 mm.
MEMO:
To form a loop, wind the charging wire around a hex key once, and turn the
hex key 3 to 4 times; then, twist the charging wire.
4) Cut the end (excess) of the twisted wire.
5) Hook the loop on the stud.
F-7-98
6) At the rear, hook the charging wire on the charging wire positioning plate;
then, hook the charging wire tension spring on the charging wire where
indicated to the following figure.
F-7-99
7) Cut off the excess of the charging wire with nippers.
8) Pick the end of the charging wire tension spring with tweezers, and hook
it on the charging power supply electrode. In the case of the pre-transfer
charging assembly, hook the spring on the pin at the front.
F-7-100
F-7-101
Make sure the followings:
- The charging wire must not be bent or twisted.
- The charging wire must be fitted in the V-groove of the charging wire
positioning plate.
[2]
[1]
[4]
[3]
[1]
[2]
[3]
[1]
Charging electrode
(Rear)
(Front)
Charging wire
Reel Stud
(Correct)
(Wrong)
Grid side
(Correct) (Wrong)