Ricoh Aficio FT4027, Руководство по обслуживанию

Страница: 442 / 685

TECHNICAL SERVICE BULLETIN
BULLETIN NUMBER: 4027/4527/5035/5535/4022/4522 - 021 09/04/96
APPLICABLE MODEL: FT5035/5535/4027/4527/4022/4522
SUBJECT: OFFSET IMAGES
SYMPTOM:
Faint characters and/or images appear in non-image areas.
CAUSE:
Various problems associated with toner fusing.
SOLUTION
When an offset problem occurs, it is very important to correctly isolate the cause and utilize the p roper
countermeasure to solve the problem. Listed below are the various types of offset often encountered in the
field and the countermeasures to be taken for each.
Hot Offset (excessive fusing)
After consecutive paper feeds, periodic offsets occur (125mm pitch). Similar problems are sometimes found
when using comparatively thin paper.
Action:
•
Check the fusing temperature. Is it set too high? The maximum temperature is 190
°
C.
•
Is the thermistor coming in contact with the roller? Confirm that the thermistor comes in firm cont act
with the roller. Check for deformation of the thermistor unit.
•
Is the thickness of the paper within specifications? Standard: 14 ~ 42lbs.
•
Install the new style Fusing Thermistor. (refer to TSB #FT4027/4527/5035/5535/4022/4522-015, Update
No. 2 for more information, see illustration below)
Continued...
CUSTOMER SERVICE GROUP
M
E
C
H
A
N
IC
A
L
P
A
P
E
R
P
A
T
H
E
L
E
C
T
R
IC
A
L
O
T
H
E
R
N
o
te
:
T
h
is
c
o
p
y
in
te
n
d
e
d
a
s
m
a
s
te
r
o
f o
rig
in
a
l
fo
r
re
p
ro
d
u
c
tio
n
o
f a
d
d
iti
o
n
a
l b
u
lle
tin
s
.
F
S
M
C
O
P
Y
Q
U
A
L
IT
Y
P
A
R
T
S
Metal Bracket
Plastic Bracket
Thermistor Thermistor
To prevent an electrical short between the Thermistor and the bracket, the material of the bracket has been changed from metal to
plastic. See Tech Service Bulletin Number FT4027/4527/5035/5535/4022/4522-015, Update No. 2 for parts information.
Old
New