Ricoh Ft7950 Technical Bulletin

RICOH Technical

Bulletin

PAGE: 1/7

Model:

Subject:
From:
Classification:

Penguin (Little, Crest, Emperor)

Duplex Jam Information

GTSS Field Information Dept.

Troubleshooting
Mechanical
Paper path
Other ( )

1. Stacking in the duplex feed section

A

D

F

Part information
Electrical
Transmit/receive

B

Date:

30-Nov-98

Prepared by:

C

No.: 1

H.K

Action required
Service manual revision
Retrofit information

E

G

I

H

J

Duplex entrance

Fig. 1

A: Outer inverter guide, B: Inner inverter guide, C: Duplex transport brush roller,
D: Duplex transport sensor, E: Upper position of paper guide, F: Paper holding mylar,
G: Lower position of paper guide, H: Separation belt, I: positioning roller, J: Feed roller

- Stacking mechanism -

Paper comes in down the inverter guides, and pushes the paper guide up [E].

·

Paper starts to enter the duplex tray.

·

After the trailing edge of the paper passes the duplex transport sensor [D], the paper

·

guide falls into place [G].

The brush roller [C] pushes the trailing edge of the paper so that the paper is not

·

caught in the inverter guides [A and B].

At the appropriate time after the trailing edge of the paper passes through the duplex

·

transport sensor, the positioning roller starts to rotate to deliver the paper to the duplex
feed section. The paper guide directs the paper under the mylar ([F] on the previous
page) so that the paper stacks correctly in the duplex feed section.

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- Correct stacking condition -

Penguin (Little, Crest, Emperor)

The pages delivered by the positioning roller are stacked along the separation belt like
a staircase as shown in fig. 2. The paper holding mylar guides the paper and holds the
leading edge in the correct position for duplex feed.

Correct stacking condition

Fig. 2

Date:

Staircase stacking

30-Nov-98

No.: 1

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Model:

Penguin (Little, Crest, Emperor)

Date:

30-Nov-98

No.: 1

2. Duplex jam troubleshooting

Duplex jams can be caused by differences in the width of various paper brands, bad
condition of the inner inverter guide, or curled paper. The following troubleshooting
information is for these causes.

2-1. Paper wider than jogger fence span

2-1-1. Cause

If the interval between the jogger fences is less than the paper width, the positioning
roller cannot deliver the paper to the duplex feed position because of friction as the
paper rubs against the joggers. Then, duplex jams occur.

Fig. 4

Friction

Fig. 3 The jogger fence
span is less than the
paper width

Pattern 1

Not staircase stackin

This condition causes double feed and/or non feed.

Paper is not delivered to the feed
section.

Fig. 5

g

The paper holding mylar does not hold the stacked
paper properly. The next sheet pushes the stacked
paper back.

Pattern 2

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2-1-2. Duplex jogger fence span adjustment

1) By accessing SP1-7-1 (jogger span adjustment), check

2) Feed and stack one sheet of the paper of the size and

3) Open the front door, and gently pull out the duplex tray.

4) Measure the distance between rear jogger fence and

5) If the distance is not within this limit, adjust the jogger

Penguin (Little, Crest, Emperor)

the jogger sp an adjustment setting.
brand normally used in the duplex tray.

paper (3 times or more).
Adjustment standard: A = 0.5 to 1.5 mm

fence span by changing the SP mode value. Input a
wider value than you want at first, then reduce it – this
is necessary because there is a little play in the
mechanism. If the SP mode is changed from narrower
to wider, paper buckling may appear.
SP1-7-1: 0.3 mm/step
– key: Wider span, + key: Narrower spa n

Date:

30-Nov-98

Fig. 8

No.: 1

A

2-2. Deformed inner inverter guide
2-2-1. Cause

If the inner inverter guide (A2474433: Inverter Guide Plate) in the inverter unit is deformed
(for example, due to a manufacturer error), the magnets on the inner inverter guide may
not attract the outer inverter guide. Then, jams may occur when the paper enters the
duplex unit.

2-2-2. Check points for the inner inverter guide

1) When paper is stacking in the duplex unit, check if the inner inverter guide vibrates.

2) Remove the paper exit unit (refer to paper exit unit removal on page 6-121 of the
service manual). Check if the magnets on the inner inverter guide attract the outer
inverter guide.

3) If the magnets do not attract the outer inverter guide, replace the inner inverter guide.
Make sure that the magnets on the new inverter guide attract the outer inverter guide.

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2-3. Paper curl
2-3-1. Cause

Paper with a large curl (height:15 mm or more) may cause stacking failure. There are two
stacking failure patterns. Refer to patterns 1 and 2 on page 3.

2-3-2. Procedure for checking curl height

1) Raise the positioning roller by securing the positioning roller bracket with tape so that

2) Feed and stack one sheet of the paper of the size and brand normally used in the

3) Open the front door and pull out the duplex unit quickly.

4) Measure the height of the curl at the front and rear edges of the curled side of the

5) Turn the paper upside-down and repeat the above procedure three times. Find the

The paper guide can stack curled paper fairly well, as shown in Fig. 9. However, strongly
curled paper cannot be guided properly, so jams may occur. In this case, set the paper in
accordance with steps 4 and 5 in the above procedure.

Penguin (Little, Crest, Emperor)

the positioning roller does not drop.
duplex tray.

paper.

Note:

smaller curl height and set the paper so that the curl height is smaller when paper
enters the duplex tray.

During measurement the curl height may change; measure the height quickly.

Date:

30-Nov-98

No.: 1

Fig. 9

Paper is guided

Paper curled face-up is delivered to the feed
position correctly when the paper guide is at
the lower position.

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Model:

Penguin (Little, Crest, Emperor)

Date:

30-Nov-98

No.: 1

2-3-3. Strongly curled paper

If the curl is larger than 15 mm, and the returning distance (see Fig. 10) is too long or too
short, the paper guide does not work. Thus, duplex jams may occur.
In this case, SP1-9-2 (Positioning roller on) should be adjusted so that the paper is
stacked as shown in Fig. 2.

Adjustment Standard for the returning distance: 10 - 30mm

Fig. 10

Returning distance

Fig. 11
Patterns 3 and 4

Hits
incoming
paper

Pattern 3: If the returning distance is
too long, the paper guide is raised
by the next sheet at the same time
as the positioning roller delivers the
paper. So, the paper guide cannot
work as a guide, and stack failure
occurs.

Pattern 4: If the returning distance is
too short, the paper guide is still at
the upper position when the
positioning roller delivers the paper.
So, the paper guide cannot work as
a guide, and stack failure occurs.