Sharp MX-1800N (serv.man32) Service Manual ▷ View online
MX-1800N TRANSFER SECTION L – 5
(Application amount)
6) Face the primary transfer UN upward.
* Face the primary transfer UN upward from the cleaner UN
side.
* Take care that powders will not fly apart.
7)
Mount the primary transfer UN on the machine and execute
simulation 25-1 (3-minute belt idling) once.
simulation 25-1 (3-minute belt idling) once.
8)
Check omissions in characters, and if many omissions are
found, execute simulation 25-1 once again.
found, execute simulation 25-1 once again.
9)
If titanium hydroxide flies apart near the resist roller, clean it.
(Cleaning the belt)
* When print omission occurs, clean the primary transfer belt with
* When print omission occurs, clean the primary transfer belt with
strontium titanate.
* Clean the belt with the cleaner frame UN demounted.
1)
1)
Rotate powder charged in the strontium titanate bag (white
bag) and polish the belt circumference with the power.
* Polish the belt at the driving roller location.
* Polish the entire belt in the order of (polishing
bag) and polish the belt circumference with the power.
* Polish the belt at the driving roller location.
* Polish the entire belt in the order of (polishing
→ rotation →
polishing
→ rotation).
Little
Moderate
amount
amount
Much
Cleaner UN
Driving roller
MX-1800N TRANSFER SECTION L – 6
(After cleaning via polishing)
2) Mount the cleaner frame UN on the primary transfer UN.
3) Rotate the belt once to recover the strontium titanate applied to
3) Rotate the belt once to recover the strontium titanate applied to
the belt to the cleaner frame UN.
* Even if you rotate the belt polished with strontium titanate
* Even if you rotate the belt polished with strontium titanate
once, the strontium titanate remains in the belt surface
because it is not completely recovered to the cleaner frame
UN. Mount the primary transfer UN on the machine and exe-
cute simulation 25-1 (3-minute belt idling) twice. This recov-
ers the remaining strontium titanate to the cleaner frame UN.
In this case, the belt is problem-free even if it tarnishes
whitely.
because it is not completely recovered to the cleaner frame
UN. Mount the primary transfer UN on the machine and exe-
cute simulation 25-1 (3-minute belt idling) twice. This recov-
ers the remaining strontium titanate to the cleaner frame UN.
In this case, the belt is problem-free even if it tarnishes
whitely.
4) Apply strontium titanate to the belt.
b. Primary transfer blade
1) Remove the primary transfer unit, and put it upside down.
2) Remove the cleaner unit.
1) Remove the primary transfer unit, and put it upside down.
2) Remove the cleaner unit.
3)
Remove the transfer guide plate, and remove the primary
transfer blade.
* When installing, apply stearic acid onto the primary transfer
transfer blade.
* When installing, apply stearic acid onto the primary transfer
blade (A).
* Check the cleaner seal (B) and cleaner seal R (C). If any of
them is laid on the blade, replace it. (See step m for the
cleaner seal and step n for the cleaner seal R respectively.)
cleaner seal and step n for the cleaner seal R respectively.)
c. Primary transfer coat roller /
d. Primary transfer conduction collar /
e. Y auxiliary roller
1)
1)
Remove the primary trasnfer unit.
2)
Remove the cleaner unit.
3)
Remove the intermediate transfer belt.
4)
Disengage the engagement on the front side, and remove the
primary transfer roller (A) and the primary transfer conduction
collar (B). Remove the Y auxiliary roller (C).
primary transfer roller (A) and the primary transfer conduction
collar (B). Remove the Y auxiliary roller (C).
f. Belt drive gear
1)
1)
Remove the primary trasnfer unit.
2)
Remove the cleaner unit.
3)
Remove the screws, and remove the belt drive gear.
A
B
C
1
A
A
A
A
C
B
B
B
B
2
3
MX-1800N TRANSFER SECTION L – 7
g. Transfer drive roller
1) Remove the primary trasnfer unit.
2) Remove the cleaner unit.
3) Remove the intermediate transfer belt.
4) Clean the transfer drive roller.
1) Remove the primary trasnfer unit.
2) Remove the cleaner unit.
3) Remove the intermediate transfer belt.
4) Clean the transfer drive roller.
h. Transfer follower roller /
i. Tension roller
1) Remove the primary trasnfer unit.
2) Remove the cleaner unit.
3) Remove the intermediate transfer belt.
4) Clean the trasnfer follower roller (A) and the tension roller (B).
1) Remove the primary trasnfer unit.
2) Remove the cleaner unit.
3) Remove the intermediate transfer belt.
4) Clean the trasnfer follower roller (A) and the tension roller (B).
j. Roller cleaning brush
1) Remove the primary trasnfer unit.
2) Remove the cleaner unit.
3) Remove the intermediate transfer belt.
4) Check the roller CL brush.
1) Remove the primary trasnfer unit.
2) Remove the cleaner unit.
3) Remove the intermediate transfer belt.
4) Check the roller CL brush.
k. Registration backup roller
1)
1)
Remove the primary trasnfer unit.
2)
Remove the cleaner unit.
3)
Remove the intermediate transfer belt.
4)
Check the registration backup roller.
l. Cleaner seal /
m. Cleaner seal R
1)
1)
Remove the primary trasnfer unit.
2)
Remove the cleaner unit.
3)
Remove the cleaner seal (A) and the cleaner seal R (B).
* When attaching the seals, position the seals within the spec-
ified ranges, referring to the reference lines as indicated
below.
below.
n. Transfer toner reception seal
1)
1)
Remove the primary trasnfer unit.
2)
Remove the cleaner unit.
3)
Remove the transfer toner reception seal.
A
B
A
B
Reference line
Reference line
0 - 0.3mm
0 - 0.3mm
0 - 0.3mm
Reference line
MX-1800N TRANSFER SECTION L – 8
* When attaching the transfer toner reception seal, position
the seal within the specified ranges, referring to the refer-
ence lines as indicated below.
ence lines as indicated below.
(2) Others
a. Transfer belt separation CL detection /
b. Transfer belt separation BK detection
1) Remove the primary trasnfer unit.
2) Remove the developing unit.
3) Remove the drum unit.
4) Check the transfer belt separation CL detection (A) and the
1) Remove the primary trasnfer unit.
2) Remove the developing unit.
3) Remove the drum unit.
4) Check the transfer belt separation CL detection (A) and the
transfer belt separation BK detection (B).
B. Secondary transfer
(1) Secondary transfer unit
1)
Open the right door unit.
2)
Release the pawl, and remove the secondary transfer unit.
a. Secondary trasnfer idle gear /
b. Secondary belt follower roller /
c. Secondary transfer belt
1)
1)
Remove the secondary trasnfer unit.
2)
Remove each parts, and remove the secondary drive plate.
Remove each parts, and remove the idle gear (A).
Remove each parts, and remove the idle gear (A).
Unit
Parts
Maintenance
(1)
Secondary
transfer unit
transfer unit
a
Secondary transfer idle gear
b
Secondary belt follower roller
{
c
Secondary transfer belt
d
Secondary transfer roller
e
Secondary trasnfer belt drive
roller
roller
{
f
Roller cleaning brush
g
Secondary belt tension roller
{
Reference line
0 - 0.3mm
0 - 0.3mm
Reference line
A
B
(1)-a
(1)-g
(1)-f
(1)-b
(1)-d
(1)-e
(1)-c
(1)
1
2
1
1
2
3
3
1
2
3
A
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