DUPLO SEIKO CORPORATION Duprinter DP-330, Service Manual

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211
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Troubleshooting Guide
chap.6
Causes Symptoms Countermeasure
Printing paper not suit-
able • If paper is too thin, it will stick to drum and scrunch up.
• If grain of paper is sideways relative to transfer direction, paper will
crunch up, or get jammed on the paper receiving plate.
• If paper curl upward, it will likely scrunch up. If curl downward, it will
likely get jammed on the paper receiving plate.
Explain causes to users. Have user
change to paper conforming to
specifications.
Image of document • If set-solid exists near leading edge of paper, paper will likely scrunch
up.
• If set-solid is blasted to one side of paper, paper will not be ejected in
a straight line. As a result, ejected paper will be disorderly piled and
likely jam on the paper receiving plate.
• Adjust leading edge margin to
about 10 mm. (Too long margin
will cause adverse results.)
• Explain causes to users. If possi-
ble, have user change position for
set-solid.
Static electricity • If ambient air is dry, static electricity may cause disordered piles or
scrunch-up of paper.
• Explain causes to users. Have user desist
from excessive use of A/C or heating.
• If possible, have user take anti-dryness
measures including humidifiers.
Leading edge margin • If leading edge margin is not correct, scrunch-up of paper will likely
result.
Scrunch-up of paper may also result if the margin is too long.
IMPORTANT:
Perform printing position sensors
adjustment.
Guide roller pressure &
timing • If Guide roller pressure is insufficient, paper will not be gripped proper-
ly, causing less feed amount determined by timing roller, or disap-
pearance of leading edge margin. This results in the paper scrunch-
up.
Perform escape amount and escape
timing adjustments.
Timing roller clutch • Any slippage of the timing roller clutch will reduce feed amount and
eliminate leading edge margin. This results in the paper scrunch-up.
• If the timing roller clutch does not disengage properly, the timing roller
segment gear will not return correctly, causing reduction of feed
amount or disappearance of leading edge margin. As a result, paper
will scrunch up.
Clean timing roller clutch. Repair if
necessary.
Paper stripper finger • If timing is too low, or the gap between drum and the leading edge of
paper is too large, paper stripper finger will not enter into the gap,
causing the paper scrunch-up.
Perform paper stripper finger adjust-
ment.
Air • If sufficient air is not delivered from the tip of the paper stripper finger,
it will not lift the leading edge of paper off drum. Scrunch-up of paper
will result.
• Check if the hole in the fingers tip
is blocked by foreign matter.
• Check pipes for kinks or discon-
nections.
• Check valves and O-rings on the
air pump.
Paper ejection belt • If the speed of the paper ejection belt, if cannot eject the paper onto
the paper receiving plate with sufficient force.
As a result, there will be paper jams in the vicinity of the discharge
port. (Sometimes the trailing edge of the paper gets caught in the jam-
ming sensor and a paper jamming error is displayed.)
If the belt is broken or stretched,
replace it.
Paper ejection fan unit • If the suction force of the fan drops, it will not be able to blow the
paper (which has risen clear of the ejection belt) onto the paper
receiving plate with be paper jams in the vicinity of the discharge port.
(Sometimes the trailing edge of the paper gets caught in the jamming
sensor and a paper jamming error is displayed.)
Clean the fan. If it still does not work
properly, replace it.
Ink • Too much ink transferred to paper will likely cause scrunch-up of
paper.
• Perform ink volume adjustment of drum.
• Explain user that ink transfer volume
increases immediately after paper scrunch-
up, and advise user to restart printing at
standard speed, then.
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see page 175
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see page 173
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see page 167
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see page 168
Top blower fan • If the fan's air current is insufficient, paper stripping will be poor, and
there will not be sufficient force to press the paper onto the paper
ejection belt. This will cause unstable paper ejection.
• Inspect the fan.
(29) Paper Jams in the Paper Ejection Side