Konica Minolta bizhub PRO 1050 Service Manual page 558

Field Service Ver3.0 Nov.2006
(5) 40 mm from the trailing edge
1) When the trailing edge of the paper passed
through the pre-transfer roller, the load
decreased and the paper speed became
faster momentarily.
Possible with thick papers 200 g/m
heavier.
(6) Random occurrence
1) Transfer jitter that occurs when the leading
edge of paper touches the conveyance sec-
tion. Main causes are as follows.
• Speed change of the conveyance belt itself
• Speed difference between the registration roller
and the conveyance belt
• Rough paper movement while it passes through
the conveyance belt
• Shock because of the paper leading edge touch-
ing the conveyance belt
C. Procedure
(1) Approx. 250 mm from the trailing edge
1.
With the [Printer Regist Loop Adjustment] in the
service mode, reduce loop amount.
(2) Approx. 145 mm from the trailing edge
1.
Adjust the registration line speed.
2.
Strengthen the nip pressure of the pre-transfer
roller. (See P.511)
Note
• If the nip pressure is strengthened it is pos-
sible that transfer jitter 40 mm from the
trailing edge may occur. In this instance
select whichever image is best. (before
pressure increase or after)
• If transfer jitter occurs at around 140 mm
from the trailing edge, it may be impossible
to determine if the jitter is caused by the
registration roller (145 mm) or by the fusing
unit (138 mm). In this instance cut 20 mm
off the trailing edge of an A3 sheet and
print a test pattern to the cut paper. If the
position of the jitter changes in relation to
the leading edge the cause can be deter-
mined to be the registration roller.
(3) Approx. 138 mm from the trailing edge
1.
Strengthen the nip pressure of the pre-transfer
roller.
Note
2
or
• If the nip pressure is strengthened it is pos-
sible that transfer jitter 40 mm from the
trailing edge may occur. In this instance
select whichever image is best. (before
pressure increase or after)
• If transfer jitter occurs at around 140 mm
from the trailing edge, it may be impossible
to determine if the jitter is caused by the
registration roller (145 mm) or by the fusing
unit (138 mm). In this instance cut 20 mm
off the trailing edge of an A3 sheet and
print a test pattern to the cut paper. If the
position of the jitter changes in relation to
the leading edge the cause can be deter-
mined to be the registration roller.
2.
Remove 2 screws [2] to remove 2 suction cov-
ers [1] at the lower side of the conveyance belt
on both sides of the conveyance section so as
to improve the conveyance suction ability.
(See P.328))
Note
• If the transfer suction ability is increased it
is possible that transfer jitter may occur
145 mm from the trailing edge. Select
whichever image is best. (before adjust-
ment or after)
12. ADJUSTMENT FOR POD
(See P.511)
[2] [1]
[2] [1]
1050fs3053c
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