Ricoh FT7650, FT660 Technical Bulletin

Technical Bulletin No. RTB-001

SUBJECT: Light Copies DATE: Nov. 30, ’96

PAGE: 1 of 2

PREPARED BY: F. Noguchi

FROM: 1st Field Information Dept. QAC

CHECKED BY: T. Inoue

CLASSIFICATION:

Action Required
Troubleshooting
Retrofit Information

Revision of service manual
Information only
Other

MODEL:

F401/411/421

<Symptom>

When making multiple copies (100~300) of an original with a high image area ratio
(example: Test Chart=35%), there is a drop in the copy image density.

<Cause>

The toner supply level is less than the toner consumption level.

<Field Action>

1. If the customer frequently makes copies of originals with an image area ratio of more
than 30%, please change the toner supply ratio from "N" to "H". (SP Adjustment, page
7, Factory Use-T)

Note: If the toner supply level of "H" is selected, dirty background may appear in

non-image areas during toner supply.

Explanation
To prevent dirty background during toner supply with the F401S, the toner supply rate
default level has been lowered. (A 6% letter original has been found to be the type of
original most often used in the field.)

F401S F400S

L N H L N H
Toner Supply Co-efficient x 0.3 x 0.5 x 1.0 x 0.5 x 1.0 x 1.5
Max. Toner Supply Ratio 30% 30% 60% 30% 60% 90%

2. During installation or demonstrations, please do not use an original with a high image
area ratio, like the test chart, in the multi-copy mode (100~300).

Reason: Vsp is detected after the copy run has been completed if 10 or more copies
are made after the last Vsp detection. Since the transfer belt must be released when
checking Vsp, a Vsp check cannot be done during a multi-copy run. Therefore, the
toner density control during a multi-copy run will try to get close to the VT based on the
Vref determined at the time of the last ID Sensor detection. In other words, it tries to
maintain the toner density at the level set during the last ID sensor check. At the start
of the copy run, if Vsp<1/10Vsg then the toner supplied will be insufficient. After the
multi-copy run, the ID Sensor detection was performed and Vref was changed but
since the toner density did not reach the targeted toner density level, the image density
dropped during the next multi-copy run.

<Service Manual Correction> (See attached page)
Section 4: Service Tables

2. Service Program Mode

2.2: Service Program Mode Table
Page 4-12

Technical Bulletin No. RTB-001

SUBJECT: Light Copies DATE: Nov. 30, ’96

PAGE: 2 of 2

SP ADJUSTMENT

❶
❷
❸

PAGE 7

❼

PAGE 8

❺
❻

❽

❹

A176M508.img

Item Function Note

Selects toner supply mode.
(See the process control section for

❶

details about each supply mode.)
Default: Auto Mode

Changes the toner supply level in auto
and detect toner supply mode.

Default: N

Toner Supply level L N H

❷

Toner Supply Co-effcient x 0.3 x 0.5 x 1.0
Max. Toner Supply Ratio 30% 30% 60%

❾

Select "Auto Mode" in the field.

Select "N" in the field.

A176M509.img

Changes the toner supply ratio in fixed

❸

toner supply mode. Default: 4%
Enables and disables the auto process

control (VR, VL, VD corrections).

❹

(See the process control section for
details.) Default: Set

Inputs the grid bias voltage when auto
process control is disabled or after

❺

RAM is cleared (1 V/step).
Default: 870 V

Inputs the development bias voltage
when auto process control is disabled

❻

or after RAM is cleared (1 V/step).
Default: 220 V

Factory use only Do not change the setting in the field.

❼

Factory use only Do not change the setting in the field.

❽

Factory use only. Do not change the setting in the field.

❾

Be careful, there is no overtoning
protection system.

Normally select "Set". Select "Reset"
only to check if the cause of the
problem is related to process control or
not.

Enter the setting using the number
keys, then touch "Enter".

Enter the setting using the number
keys, then touch "Enter".

Technical Bulletin No. RTB-002

SUBJECT: Service Remarks and Service Manual Correction DATE: 15,January

’97
PAGE: 1 of 3

PREPARED BY: H. K.

FROM: 1st Field Information Dept. QAC

CHECKED BY: T. Inoue

CLASSIFICATION:

Action Required
Troubleshooting
Retrofit Information

Revision of service manual
Information only
Other

MODEL:F401/F411/F421

1. Service Remarks (service manual page 4-5)

As one of the service remarks for the fusing unit, please add the following to your service
manual.

Symptom: A smeared image appears on the leading edge at about 10 mm on the 1st copy
at the machine installation.

Details: Silicone oil may slightly soak into the surface of the hot roller during machine
storage. The silicone oil may stick to the surface of the pressure roller when the hot roller
contacted the pressure roller at installation. The pressure roller may slip due to the oil
because the hot and pressure rollers are new. Therefore, a smeared image may appear
on the leading edge at about 10 mm on the 1st copy. This is because the hot roller is
rubbing the leading edge of the copy on the pressure roller.

Action: This symptom occurs only at the 1st copy after installation. Make sample copies
and make sure that the symptom does not recur after several copies.

2. Exposure Lamp for 230 V machines

Due to the use of the transformer, the same exposure lamps (AX520016 for the 50 CPM
machine, AX520020 for the 60/70 CPM machine) as for the 110 ~ 120 V version machines
are used for the 230 V machines. The exposure lamps for the 230 V machines in the
F400/F410/F420 are different from those for the 110 ~ 120 V machines in the
F400/F410/F420. Please note that the exposure lamps for the 230 V machines of
F401/F411/F421 cannot be installed in the F400/F410/F420 machines. Please see the
following table.

F401

(50/51 CPM)

AX520016 Yes No No Yes Yes No No No No
AX520020 No Yes Yes No No Yes No No No
AX520018 No No No No No No Yes Yes No
AX520022 No No No No No No No No Yes

F411

(60 CPM)

F421

(70 CPM)

F400

(45 CPM)

110~120V

F410

(55CPM)

110~120V

F420

(65 CPM)

110~120V

F400

(45 CPM)

230V

F410

(55 CPM)

230V

F420

(65 CPM)

230V

Yes : Can be used.
No : Cannot be used.

Technical Bulletin No. RTB-002

SUBJECT: Service Remarks and Service Manual Correction DATE: 15,January

’97
PAGE: 2 of 3

3. Fusing Thermistor Replacement (service manual page 5-94) and PM item (service
manual 4-55 and 4-60)

We found that if silicone oil is applied at the point where the thermistor comes in contact
with the hot roller, this may result in peeling of the film on the thermistor. Do not apply
silicone oil to the hot roller thermistor [A]. The hot roller thermistor PM action has been
revised. Please see the following table.

EM 120K 240K 360K NOTE
Incorrect Suitable solvent.
Fusing Thermistor
Correct Replace if necessary.
Fusing Thermistor I I I

C C C

Refer to NOTE 6

Technical Bulletin No. RTB-002

SUBJECT: Service Remarks and Service Manual Correction DATE: 15,January

’97
PAGE: 3 of 3

4. Illustration Correction for the Paddle Roller (service manual page 2-46 and 2-48)

The illustrations for the paddle roller on page 2-46 and 2-48 are incorrect. Please correct
your service manuals as shown below.

Incorrect

Correct

2 - 46

2 - 48

2 - 46

2 - 48

RICOH Technical Bulletin PAGE: 1/1

Model: F401/411/421 Date: 15-Mar-97
Subject: Light Copies (2) Prepared by: F.Noguchi
From: QAC 1st Field Information Dept. Checked by: T. Inoue
Classification:

Troubleshooting
Mechanical
Paper path
Other ( )

Part information
Electrical
Transmit/receive

Action required
Service manual revision
Retrofit information

No: 003

SYMPTOM

When making multiple copies (100-300) of an original with a high image area ratio
(example:Test Chart=35%), there is a drop in image density.

CAUSE

The toner supply level is less than the toner consumption level.

SOLUTION

The toner supply ratio has been changed with the ROM modification listed below.
Please replace the ROMs as necessary.

Old New

L N H L N H
Toner Supply Coefficient x0.3 x0.5 x1.0 x0.5 x1.0 x1.5
Max Toner Supply Ratio 30% 30% 60% 30% x60% x60%
ROM ~A1755151J ~A1755151K

~A1755153J ~A1755151K

Note:

1. If the toner supply ratio has been changed from “N” to “H” (SP Adjustment, page 7,
Factory Use-T) as described in RTB-001, please return the setting to “N” when the new
ROMs are installed.

2. If dirty background appears in non-image areas during toner supply, please change the
toner supply ratio from “N” to “L”.

3. If the slitter in the Toner Supply Unit is removed, the seal may get caught in the slitter
when the slitter is reattached. Please exercise caution to prevent this from happening.

<Cut-in Serial Numbers>
Will be provided as soon as it becomes available.

RICOH Technical Bulletin PAGE: 1/9

Model: F401/F411/F421/Cardinal Bird Date: 15-Jun-97
Subject: Cardinal Bird Information Prepared by: H. Kobayashi
From: QAC 1st Field Information Dept.
Classification:

Troubleshooting
Mechanical
Paper path
Other ( )

Part information
Electrical
Transmit/receive

Action required
Service manual revision
Retrofit information

No: 4

1. Introduction

In addition to F401 (50 cpm machine), another 50 cpm machine (Cardinal Bird) is required
to increase our MIF in the high speed segment. Cardinal Bird is designed and produced
with re-manufactured parts. Ricoh collects the used F400 series machines from the
Japanese domestic market. A Ricoh factory will disassemble the collected machines,
select the re-usable parts from the disassembled parts, and assemble the machines as
new products using the selected re-usable parts and the new parts. (All the PM parts are
new parts.) As a result, the Cardinal Bird is service-friendly because the machine
configuration and PM parts are very similar to the F401 series.

RICOH Technical Bulletin PAGE: 2/9

Leveling feet

No. 17

Model: F401/F411/F421/Cardinal Bird Date: 15-Jun-97

No: 4

2. Sales/Service remarks

In addition to the F401/F411/F421 sales/service remarks, the following remarks are added
as the Cardinal Bird sales/service remarks because the Cardinal Bird has re­manufactured parts.

No. Item Category Details Action to be

taken/Remarks

17 Leveling

feet

18 Old parts

before
modification

A, B This machine has a re-manufactured bottom plate.

There are two types of bottom plate. One has two
leveling feet installed. The other has four leveling
feet.

B a) This machine has re-manufactured parts. Among

these parts, there will be some sets of old parts
before modification. These old parts are not often
replaced in the field. However, the old part should
be replaced, together with new ones, as a set if
the old part is replaced in the field because the
old parts were modified as a set.
Please refer to the following F400 MBs.

A0964718
A0964715

A0964715 (MB34)

Please accept
this.

Please accept
replacement of
the old parts
together with the
new parts as a
set.

A0964883

A0965743 A0975473 (MB111)
A0961816 A0971816

A0966303 A1766303 (MB139)
A0966338 A1766338
A0966337 A1766337

b) The jogger sensor bracket has been added for

factory purposes only. There are two types of
duplex unit.
Non-jogger sensor bracket type and jogger sensor
bracket type

A0964762 (Newly added) (MB95)

A0964887 (MB95)
A0964886

Please note that
there are two
types of duplex
unit.

RICOH Technical Bulletin PAGE: 3/9

#11

Model: F401/F411/F421/Cardinal Bird Date: 15-Jun-97

No: 4

- MB34 -

Old part
number

A0964718 Wire Fixing Plate
A0964715 A0964715 Jogger Support Plate

04340080B Philips Tapping Screw - M4 x 8

New part

number

09514008B Philips Screw with Washer - M4 x 8

Description Qty Int Page Index

2 → 0
2 → 2

n → n-2

n → n+2

X/ 77 10

/O 77 11

X/ 77 101

/O 77 103

To facilitate manufacturing, the wire fixing plate has been mounted on the jogger support
plate. The part number of the jogger support plate is still the same because the old part
was never shipped out as a service part.

#103

#103

#11

RICOH Technical Bulletin PAGE: 4/9

# 44

# 108

**

Model: F401/F411/F421/Cardinal Bird Date: 15-Jun-97

No: 4

- MB95 -

Old part
number

A0964883 A0964887 Duplex Lock Lever

A0964894 A0964895 Duplex Harness Bracket

New part

number

A0964762 Jogger Sensor Bracket
A0964886 Duplex Lock Arm

04340080B Philips Tapping Screw - M x 8

Description Qty Int Page Index

0 1
0 1
1 1

1 → 1

n → n+2

*New index number

73 *45
73 *44

X/X 73 3

X/X 75 26

DETAILS OF MODIFICATION

1. The mechanism for the duplex side registration adjustment, which was originally
designed for other models, has been incorporated into the F400/F410/F420. By
changing the position of # 44 against # 3 (one screw, # 108), side registration can be
adjusted ±1.5 mm. At the same time, the height of the duplex harness bracket (# 26)
has been increased by 2 mm to ensure the engagement of the duplex connector.

2. The jogger sensor bracket (# 45) has been added for factory use only.

# 3 Duplex Lock

11.5 mm

# 45

13.5 mm

*

# 101

RICOH Technical Bulletin PAGE: 5/9

Model: F401/F411/F421/Cardinal Bird Date: 15-Jun-97

- MB111 -

Old part
number

A0961921 A0971921 Scanner Drive Shaft C
A0961925 A0971925 Front Wire Pulley C

A0071920 A0971746 Exposure Glass Cushion C

A0965473 A0975473 Outer Optics Harness C

11026245 11026283 Connector - 2P
11026246 11026284 Connector - 3P
11026247 11026285 Connector - 4P
11026260 11026285 Connector - 3P

Old part
number

A0961766 A0971766 Lens Slider C

A0961816 A0971816 Sensors Bracket - Lens Position C

A0961994 A0971994 Filter Holder C

AA150336 AA150378 Front Shelding Mylar C

A0961766 A09771766 Lens Slider C
AC051013 AC051016 Lens Guide Red - X C
AC051015 AC051017 Guide Red - 3rd Scanner C

New part

number

A0971698 Scanner Cushion C

New part

number

Description Rank Qty Int Page Index

Description Rank Qty Int Page Index

1 → 1
1 → 1
0 → 2
4 → 4

1 1

1 → 1
1 → 1
1 → 1
1 → 1

1 → 1

1 1

1 → 1
1 → 1
1 → 1
1 → 1
1 → 1

No: 4

O/O 23 1
O/O 23 2

27 28

O/O 19 15

X/X 23 31

O/X 23 117
O/X 23 118
O/X 23 120
O/X 23 119

O/O 31 11

X/X 23 21

O/O 21 11
O/O 31 7
O/O 31 11

O/X 25 2
O/X 29 25