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MX-7040N  DISASSEMBLY AND ASSEMBLY  10 – 53

2)

After attaching the OPC drum to the OPC drum frame, use the
black protect sheet or copy paper, and manually rotate the
OPC drum two turns in the forward direction to remove stearic
acid powder applied to the OPC drum surface.

• Do not touch the OPC drum surface except for the both ends

(5mm) of the OPC drum.

• Any section of the OPC drum may be touched from above

the black protect sheet, but do not touch too strongly.

b. MC unit
1)

Remove the drum.

2)

Remove the screw, and remove the MC unit.
* When removing the MC unit only, there is no need to remove

the drum.

c. DL unit, Cleaner blade
1)

Remove the MC unit.

2)

Remove the drum.

3)

Remove the screw, and remove the MC cover.

4)

Remove the DL unit, and disconnect the connector from the
DL unit.

CAUTION: When installing, check to confirm that the hook of the

DL unit is securely engaged with the positioning boss.

CAUTION: Arrange the harness as shown below.

1) Bend the harness as shown below.

MX-7040N  DISASSEMBLY AND ASSEMBLY  10 – 54

When attaching the cover, refer to the figure below.

5)

Remove the screw, hold the projection of the cleaner blade,
and remove it.

d. TCDL unit, Toner reception sheet, Side seals F/R
1)

Remove the MC unit.

2)

Remove the drum.

3)

Remove the light shielding sheet and the harness cover.

CAUTION: When attaching the light shielding sheet, attach it to the

attachment reference.

CAUTION: When the side seals F and R and the toner reception

sheet are replaced, this procedure is not required.

4)

Remove the screw, and remove the TCDL unit. Disconnect the
connector from the TCDL unit.

CAUTION: When the side seals F and R and the toner reception

sheet are replaced, this procedure is not required.

Difference-in-level reference

0mm

0.5mm

Diff

erence-in-le

vel

ref

erence

0mm

0.5mm

MX-7040N  DISASSEMBLY AND ASSEMBLY  10 – 55

5)

Check the toner reception sheet.

CAUTION: When replacing the toner reception sheet, attach it to

the attachment reference of the toner reception cover.

CAUTION: When replacing the toner reception sheet, it is not

required to remove the toner reception cover.

6)

Check the side seals F/R.

CAUTION: When replacing the side seals F and R, it is not required

to remove the toner reception cover.

CAUTION: When there is a clearance in the edge section of the

side seals after replacing the blade and when the side
seal is replaced, attach the seal to the attachment refer-
ence.
Also attach so that the rubber section of the cleaner
blade does not interfere with the side seal when the rub-
ber section is pushed in.

Be careful not to step on the toner reception sheet. Especially
when the side seals are replaced without changing the toner
reception sheet, turn over the toner reception sheet and attach
the seals as shown in the figure below.

e. Cleaning brush
1)

Remove the MC unit.

2)

Remove the drum.

3)

Remove the side seals R.

4)

Remove the screw, and remove the plate and the gear.

5)

Remove the screw, and remove the cleaning brush.

6)

Remove the coupling and the bearing from the cleaning brush.

Diff

erence-in-le

v

el

ref

erence

0mm

0.5mm

Difference-in-level reference

0mm 0.5mm

* When attaching the side moltopren, attach it by pushing

it onto the side of the toner reception cover.

Sample of attachment

Side seal F PO

Side seal R PO

Toner reception
cover edge reference

+0
+0.2mm

(Attach along it.)

㽲

㽳

Blade edge reference

+0mm
+0.2mm

Blade edge reference

+0mm
+0.2mm

Toner reception
cover edge reference

+0
+0.2mm

(Attach along it.)

MX-7040N  DISASSEMBLY AND ASSEMBLY  10 – 56

Note for servicing the OPC drums
1. Prevent contamination
Note
• Be careful not to leave fingerprints or oily dirt on the OPC drum

surface. (Keep the unit away from oils and dust.)

• When replacing the OPC drum, cover the OPC drum with the

protection sheet and hold the protection sheet.
If it is required to hold the OPC drum directly, use enough care
not to touch the cleaning blade area, 5mm inside from both
edges of the OPC drum. (If a fingerprint or oily dirt is attached to
the cleaning blade area of the OPC drum, the cleaning blade
may flip.)

Countermeasures
If a fingerprint is attached to the OPC drum surface erroneously,
perform the following countermeasures.
1)

Use dry cloth to clean and remove the dirt.

2)

Apply stearic acid powder to prevent blade flip.

Check method
Check to confirm that the OPC drum is free from fingerprints or oily
dirt and that the cleaning blade is completely cleaned by the follow-
ing method.
• Make a print of a half tone image on all the surface of A4 (11" x

8.5") paper, and check the printed paper for any abnormality in
the image.

2. Prior exposure prevention
Note
• Avoid servicing in a place where there is strong light.
• Do not expose the unit to light for a long time.
• Cover the OPC drum with light-blocking material. (When using

paper, use about 10 sheets of paper to block light.)

Countermeasures
If the OPC drum is erroneously exposed to light too much (prior
exposure), perform the following countermeasures.
1)

Print half tone images on the whole surface of A4 (11" x 8.5")
paper, and check to confirm that there is no irregular density
area in the previously exposed section.

2)

If the OPC drum is subject to stress by being exposed to
strong light, it may be recovered by leaving it in a dark and cool
place.
If it may not be recovered, replace it with a new one.

a. Transfer separation pawl
1)

Remove the screw, and remove the holder. Remove the sepa-
ration pawl and the spring from the holder.

CAUTION: When removing and installing, be careful not to scratch

the transfer belt with the separation pawl.

b. Primary transfer toner reception seal
1)

Remove the screw, rotate the primary transfer cleaner unit and
remove it.

2)

Remove the screw, and remove the primary transfer toner
reception seal.