Ricoh A095 Technical Bulletin FT6645
Technical Bulletin No. RTB-001
SUBJECT: F400/F410 Fusing unit modification (manual corrections) DATE:SEP.15.’93
PAGE: 1 of 6
PREPARED BY: S.MANO
CHECKED BY:
CLASSIFICATION:
Action Required
Troubleshooting
Retrofit Information
FROM: Copier Technical Support Group
MODEL: F400/F410
Revision of service manual
Information only
Other
[A]
[B]
An oil supply roller [A] and a cleaning roller [B] are added in the fusing unit.
This modification is implemented from the first mass-production machine.
1. Oil supply roller
The oil supply roller touches the hot roller and applies a small amount of silicone oil to the
hot roller surface.
Purpose:
1) To prevent any foreign substance (ex. toner, paper powder) from adhering to the
hot roller surface.
2) To improve paper separation from the hot roller.
2. Cleaning roller
Purpose:
1. To clean the pressure roller surface.
Note: Both the oil supply roller and cleaning roller are PM parts. Please be sure to
replace them at every 120K copies.
Technical Bulletin No. RTB-001
SUBJECT: F400/F410 Fusing unit modification (Manua corrections) DATE:SEP.15.’93
PAGE: 2 of 6
Manual corrections
Because of this modification, the following parts of the service manual should be corrected.
Section 2: DETAILED SECTION DESCRIPTIONS
P2-94: Please add two rollers to the overview illustration as shown by the illustration on
page 1 of this RTB.
Please delete the third paragraph "This model uses an oilless. . . . . ."
NEW Please add the attached "7.7 OIL SUPPLY" (attached - page 4 of this RTB)
Section 4: SERVICE TABLES
P4-5 Please add the following service remark as item No.4 of the 1.11 FUSING UNIT.
Level the oil supply roller while it is stored, otherwise the silicone oil in the oil supply roller
comes out from the lower part.
P4-58 Please change the Fusing Thermistor table as below.
EM 120K 240K 360K NOTE
Fusing
Thermistor
P4-59 Please add the following table to the PM table.
EM 120K 240K 360K NOTE
Oil Supply Roller R R R
Cleaning Roller R R R
CCC
Suitable solvent.
Refer to NOTE 6
P4-64 Please delete "Then apply small amount of silicone oil there every 240K copies."
from item (1) of NOTE 6: Fusing Section. This is because the oil supply roller
applies small amount of silicone oil. Just clean the thermistor at every PM.
Technical Bulletin No. RTB-001
SUBJECT: F400/F410 fusing unit modification (Manual corrections) DATE:SEP.15.’93
PAGE: 3 of 6
P4-70 Please remove "and apply silicone oil." from the item 8-2 of the preventive
maintenance (PM) schedule.
Please add the following PM procedure as item No.8-4 and 8-5 of the PM
schedule.
8-4. Replace the oil supply roller.
8-5. Replace the pressure roller cleaning roller.
Section 5: REPLACEMENTS AND ADJUSTMENTS
P5-100 Please correct step 4 of procedure "7.5 HOT ROLLER REPLACEMENT" as
follows.
•
Original expression:
4. Remove the upper entrance guide [D] (1 screw).
•
Corrected expression
4. Remove the oil supply roller unit.
(Refer to Oil Supply Roller Replacement.)
This is because:
1) Since the oil supply roller is installed to the upper entrance guide, the upper
entrance guide is renamed as "cleaning roller unit".
2) No screw is used to install the cleaning roller unit to the fusing unit. (The upper
entrance guide used to be installed with a screw.)
Please delete the screw fixing part [D] from the illustration.
New Please add procedure "7.10 OIL SUPPLY ROLLER REPLACEMENT" (attached -
page 6 of this RTB) and "7.11 CLEANING ROLLER REPLACEMENT" (attached -
page 7 of this RTB).
Section 6: TROUBLESHOOTING
P 6-15 Please add the following sentence as a possible cause for SC520. (To prevent this
from occurring, replace the cleaning roller at every PM.)
Cleaning roller is too dirty and applies a great load to the fusing/duplex drive motor.
Technical Bulletin No. RTB-001
SUBJECT: F400/F410 fusing unit modification (Manual corrections) DATE:SEP.15.’93
PAGE: 4 of 6
7.7 OIL SUPPLY AND CLEANING
[A]
[A]
[C]
The oil supply roller [A] is soaked with silicon oil [B]. The roller contacts the hot roller by a
spring. It turns with the hot roller and applies a light coat of silicon oil to the hot roller.
The cleaning roller [C] collects any foreign substance (toner, paper dust) on the pressure
roller.
[B]
Technical Bulletin No. RTB-001
SUBJECT: F400/F410 fusing unit modification (Manual corrections) DATE:SEP.15.’93
PAGE: 5 of 6
7.10 OIL SUPPLY ROLLER REPLACEMENT
[A]
[E]
[B]
[D]
[C]
1. Pull out the fusing unit.
2. Lower the lever [A].
3. Remove the oil supply unit [B].
4. Remove the spring [C].
5. Remove the bushing [D].
6. Replace the oil supply roller [E].
7. Reassemble the unit.
NOTE: While lowering the lever [A], install the oil supply unit.
Technical Bulletin No. RTB-001
SUBJECT: F400/F410 fusing unit modification (Manual corrections) DATE:SEP.15.’93
PAGE: 6 of 6
7.11 CLEANING ROLLER REPLACEMENT
[A]
[B]
1. Pull out the fusing unit.
2. Remove the bottom plate [A] (1 screw).
3. Remove the cleaning roller unit [B] (2 screws).
4. Remove the bracket [C] (1 screw).
5. Remove the cleaning roller [D].
6. Remove the seals [E] and bushings [F] from both sides of the cleaning
roller, then install them to the new cleaning roller.
7. Reassemble the unit.
[E]
[F]
[D]
[F]
[E]
[C]
Technical Bulletin No. RTB-002
SUBJECT: F400/F410 transfer belt unit modification
(manual corrections)
PREPARED BY: S.MANO
FROM: Copier Technical Support Group
CHECKED BY:
CLASSIFICATION:
Action Required
Troubleshooting
Retrofit Information
Revision of service manual
Information only
Other
[A]
DATE:SEP.15.’93
PAGE: 1 of 4
MODEL: F400/F410
[B]
To improve copy quality, the following modification is implemented from the first
mass-production machine.
1. The discharge plate position is changed from [A] to [B].
2. The transfer current default data is changed from 40 µA to 50 µA.
Details:
Small gray dots appear under the following conditions:
• Low humidity
• Reverse side of the duplex copy
• Halftone image area
Under the above condition, the paper loses too much of its moisture when it passes the
fusing unit after the first side copy cycle. When the paper is separated from the transfer
belt during second side copying, the remaining electricity on the paper (because of the
high electrical resistance) is suddenly discharged and toner is spread around, creating the
gray dots.
To reduce the occurrence of the above image as much as possible, the position of the
discharge plate is changed and the transfer current is changed.
Technical Bulletin No. RTB-002
[B]
SUBJECT: F400/F410 transfer belt unit modification
(manual corrections)
DATE:SEP.15.’93
PAGE: 2 of 4
Manual corrections:
Because of this modification, the following parts of the service manual should be corrected.
Section 2: DETAILED SECTION DESCRIPTIONS
P2-59 Change the discharge plate [F] position as shown in the illustration.
[A]
[E]
[D]
[C]
[F]
Correct the explanation concerning the discharge plate [F] as below:
Incorrect:
Helps paper separation from the transfer belt by discharging the remaining negative
charge on the transfer belt.
Correct:
Discharges the remaining negative charge on the transfer belt and feeds it back to the
transfer power pack to control the transfer current and keep it constant.
Note: Paper is separated from the transfer belt by its stiffness.
Technical Bulletin No. RTB-002
SUBJECT: F400/F410 transfer belt unit modification
(manual corrections)
P2-61 Delete "Before separating the paper from the transfer belt," from the first
paragraph. Instead of this, write "After separating the paper from the transfer
belt,"
Also correct the illustrations as below
DATE:SEP.15.’93
PAGE: 3 of 4
Section 4: SERVICE TABLES
P4-13
Default transfer current value is changed from 40µA to 50µA.
Standard data is also changed from 40µA to 50µA.
Technical Bulletin No. RTB-002
SUBJECT: F400/F410 Fusing unit modification
(manual corrections)
Section 5: REPLACEMENTS AND ADJUSTMENTS
P5-64 Correct the third (from the top) illustration, the discharge plate position is
changed as shown below.
DATE:SEP.15.’93
PAGE: 4 of 4
Technical Bulletin No. RTB-003
SUBJECT: F410 RDH Finisher system duplex method change
(manual corrections)
PREPARED BY: S. MANO
CHECKED BY:
CLASSIFICATION:
Action Required
Troubleshooting
Retrofit Information
For the F410, the alternate paper feed system is disabled.
The following is the new method the F410 uses for copying 1 sided originals to 2 sided
copies.
Please delete pages 14, 15, and 16 of the RDH section and insert the following
explanation.
Revision of service manual
Information only
Other
FROM: Copier Technical Support Group
MODEL: F410
DATE: SEP. 15. ’93
PAGE: 1 of 2
1 SIDED ORIGINAL TO 2 SIDED COPY MODE
When making two-sided copies, first of all, the even pages of the originals placed on the
RDH are copied to the paper from the paper tray. They are stored in the duplex tray. Then
the originals are recirculated, and the odd pages of the originals are copied to the sheets
stored in the duplex tray.
When making two or more sets of copies, the following copy sets are made in the same
way as the first set copy.
Therefore, the original recirculates twice for each copy set.
-Operation- (For example)
Two sets of two-sided copies are made from four one-sided originals.
1) When the start key is pressed, the 4th and 2nd originals are scanned then these
copies are stacked in the duplex tray. The 3rd and 1st originals have only
passed over the exposure glass [Fig. 1].
2) Soon after the 1st recirculation is completed, the second recirculation starts. The
4th originals just passes the exposure glass then the 3rd original is scanned.
This image is copied onto the copy which has been fed from the duplex tray and
is then fed out onto the finisher [Fig. 2].
3) The 2nd original just passes the exposure glass and then the 1st original is
scanned. The copy from the duplex tray is fed for copying the 1st original and
then fed out onto the finisher. At this moment, the duplex tray becomes empty
[Fig. 3].
4) The following steps repeat steps 1) to 3). [Fig. 4] to [Fig. 6].
Technical Bulletin No. RTB-003
2 43’
4’3’1’
2’
②
③
SUBJECT: F410 RDH Finisher system duplex method change
(manual corrections)
<RDH>
1
2
3
4
<Duplex>
2
4
<Paper tray>
Fig 1
3’
4’
1’
2’
2’
3’
4
2
Fig 2
❶
①
❷
DATE: SEP. 15. ’93
PAGE: 2 of 2
1’
Fig 3
❸
❹
❸
④
1’
3’
2
4
②
1’
3’
④
❹
❸
④
2
4
②
1’
3’
❸
❶
❷
❶
②
④
2
4
Fig 4 Fig 5 Fig 6
1 2 3 4: 1st recirculated
1’ 2’ 3’ 4’: 2nd recirculated
① ② ③ ④: 3rd recirculated
❶ ❷ ❸ ❹: 4th recirculated
: Without exposing
(for RDH)
Technical Bulletin No. RTB-004
SUBJECT: F400/F410 guidance ROMs installation procedure
(manual correction)
PREPARED BY: S.MANO
CHECKED BY:
CLASSIFICATION:
Action Required
Troubleshooting
Retrofit Information
This information is only for Infotec version (A095/A096-26) machines and Ricoh Europe
version (A095/A096-27) machines.
Because it is necessary to install the guidance ROMs at machine installation, to facilitate
the installation procedure, the operation panel is separated from the copier and attached
as an accessory.
The operation panel, the three fixing screws and the two grounding screws are wrapped in
air packing (cushion) and stored in the second feed tray (universal tray).
Because of this, pages 3-12 and 3-13 of the service manual should be corrected as
follows:
Revision of service manual
Information only
Other
FROM: Copier Technical Support Group
MODEL: F400/F410
DATE:SEP.15.’93
PAGE: 1 of 2
2.3 GUIDANCE ROM, INSTALLATION
[B]
[C]
[A]
[A]
1. Open the 2nd tray then remove the tapes [A] securing the operation panel.
2. Unpack the air packing cushion [B].
3. Install the guidance ROMs (IC111 [C], IC112 [D], IC113 [E]) on the operation panel
board [F].
[E]
[D]
[F]
Technical Bulletin No. RTB-004
SUBJECT: F400/F410 guidance ROMs installation procedure
(Manual correction)
[A]
[C]
DATE:SEP.15.’93
PAGE: 2 of 2
[B]
4. Connect the connector [A] to the operation panel.
5. Secure the two protective earth wires with screws [B].
6. Install the operation panel [C] to the copier (3 screws).
7. After installing the new guidance ROMs, plug in the power cord and turn on the main
switch then perform the "touch panel display position adjustment" as follows.
1) Press the interrupt key then press the clear/stop key more than three seconds.
C
2) Follow the guidance on the LCD.
Technical Bulletin No. RTB-005
[B]
SUBJECT: F400/F410 Dual Job Feeder separation belts
(manual correction)
PREPARED BY: S.MANO
CHECKED BY:
CLASSIFICATION:
Action Required
Troubleshooting
Retrofit Information
The quantity of the separation belt have been changed from two to four.
Reason of the modification:
On the original printed by the laser printer, the toner may not be fused sufficiently and the
image may smeared by the separation belts.
To prevent this, two more separation belts are added to widen the contacting area
between the separation belts and the original so that the separation pressure is not
concentrated to the narrow area.
Revision of service manual
Information only
Other
FROM: Copier Technical Support Group
MODEL: F400/F410
DATE:SEP.15.’93
PAGE: 1 of 3
After this modification, these separation belts are still PM parts and the replacement
interval is 1PM (120k copies) as same as before this modification.
Because of this modification, the illustrations in page 7, 14, 15, 34 and 35 should be
changed. The quantity of the separation belts should be doubled. There is no correction
except illustrations.
Manual corrections:
Page 7 - upper illustration
[C]
[A]
[E]
[D]
[F]
Technical Bulletin No. RTB-005
[B]
[C]
SUBJECT: F400/F410 Dual Job Feeder separation belts
(manual correction)
Page 14 lower illustration
[A]
[D]
[E]
Page 15 illustration
DATE:SEP.15.’93
PAGE: 2 of 3
[B]
[C]
[A]
[D]
Technical Bulletin No. RTB-005
SUBJECT: F400/F410 Dual Job Feeder separation belts
(manual correction)
Page 34 lower illustration
[E]
[D]
Page 35 illustrations
DATE:SEP.15.’93
PAGE: 3 of 3
[A]
[B]
[C]
[D]
Technical Bulletin No. RTB-006
SUBJECT: F400/F410 Troubleshooting DATE:Nov.30, ’93
PAGE: 1 of 10
PREPARED BY: S.MANO
CHECKED BY:
CLASSIFICATION:
Action Required
Troubleshooting
Retrofit Information
Revision of service manual
Information only
Other
FROM: Copier Technical Support Group
MODEL: F400/F410
TROUBLESHOOTING
The following problems and solutions are based on our experience in the Japanese
market. We think the following countermeasures and customer instructions will help your
service activity in your field.
1. Dark copy/Dirty background
< Phenomenon>
If the machine is moved from a cold place to a warm place and the main switch is turned
on immediately, it is possible that a dark copy appears, or a dirty background copy,
followed by several light copies.
< Possible cause>
If condensation accumulates on the optics or drum because of a sudden temperature
change, less light reaches the drum during the process control data initial setting. The
machine controls for a lighter image density.
If condensation accumulates on the optics, a dark copy appears. If condensation
accumulates on the drum, a dirty background copy appears.
After some time, when the condensation on the optics evaporates or the condensation on
the drum is removed by copy paper going through the copier, the machine will return to
the normal condition and light copies appear.
< Countermeasure>
Wipe off the condensed water on the optics and drum, then perform the process control
data initial setting.
Technical Bulletin No. RTB-006
SUBJECT: F400/F410 Troubleshooting DATE:Nov.30, ’93
PAGE: 2 of 10
2. Fusing jam
< Phenomenon>
If there is solid image at the trailing edge on the front side of an original [A] for the front
side copying, this solid image comes to the back side of the leading edge [B] during the
front side copying (front side copying is done after back side copying).
In this case, a fusing jam might occur. (Thinner paper has higher jam possibility.)
< Possible cause>
The solid image at the leading edge on the back side of the paper might stick to the
pressure roller and it will not separate, resulting in a fusing jam.
a. Front
Solid image
Original
b. Rear Side
[A]
Copy
Solid image
[B]
< Countermeasure>
Instruct the customer to select the edge erase mode.
Technical Bulletin No. RTB-006
Normal condition
SUBJECT: F400/F410 Troubleshooting DATE:Nov.30, ’93
PAGE: 3 of 10
3. False toner end detection at installation
< Phenomenon>
It is possible that the toner end condition appears on the LCD just after installing a new
machine with a new toner bottle.
< Possible cause>
This is because there is some distance between the toner bottle and the toner supply roller
and it takes time to completely fill the toner hopper with toner. Therefore it is possible for
the toner end condition to occur. In particular, this tends to occur when continuous copies
are made from a high image density original just after installation (developer initial setting).
Start-up
Too much toner is spent
immediately
< Countermeasure>
Make 50 ∼ 100 copies to fully supply the toner into the toner hopper. Stop the copying at
every 10 copies to allow the machine creating the ID sensor pattern to maintain precise
toner density control.
Note: This countermeasure is the same as that for the next item "4. Uneven image
density just after the installation" .
We recommend to perform the above procedure anytime the machine is installed.
Technical Bulletin No. RTB-006
SUBJECT: F400/F410 Troubleshooting DATE:Nov.30, ’93
PAGE: 4 of 10
4. Uneven image density just after the installation
< Phenomenon>
Just after installation (up to 50 ∼ 100 copies), the image density (solid image) at the front
and the rear is lighter than the image density at the center.
Lighter Lighter
< Possible cause>
As shown in the illustration in the previous page, in the new toner hopper, the toner is
filled from the front to the rear. It takes time to completely fill the toner hopper. Therefore
it takes about 50 to 100 copies to evenly supply toner to the toner supply roller.
Also, the toner supply roller width is 210mm, which is narrower than wide size paper such
as A4 sideways (297mm) and letter sideways (279mm). Therefore, image density tends to
be lighter especially at the sides.
< Countermeasure>
The countermeasure is the same as that for "3. False toner end detection at
installation"
Make 50 ∼ 100 copies to fully supply the toner into the toner hopper. Stop the copying at
every 10 copies to allow the machine creating the ID sensor pattern to maintain precise
toner density control.
Technical Bulletin No. RTB-006
SUBJECT: F400/F410 Troubleshooting DATE:Nov.30, ’93
PAGE: 5 of 10
5.DJF Original jam (F400 only)
When an original generates a lot of static electricity, it tends to stick to the exposure glass
and cause an original jam.
< Countermeasure>
If this occurs, apply a small amount of silicone oil on the exposure glass.
If this problem occurs frequently because of the kind of originals that the customer uses,
install the F410 type exposure glass which has an anti-static coating as a special
countermeasure.
6. Dirty background
< Phenomenon>
If the customer does not turn off the machine at all, a dirty background might appear.
< Possible cause>
The process control data initial setting does not work because it works when the machine
is turned on.
< Countermeasure>
Instruct the customer to turn off the main switch at the end of the day (Turn off the
machine at least 30 minutes; fusing temperature should be lower than 100 degrees ).
Caution: We will modify the software so that the process control data initial setting
functions when the weekly timer turns on the machine. This new software will be
implemented from December production machines. We will let you know the details,
such as cut-in serial number, in a later RTB.
Technical Bulletin No. RTB-006
SUBJECT: F400/F410 Troubleshooting DATE:Nov.30, ’93
PAGE: 6 of 10
7. Distorted vertical lines
< Phenomenon>
Vertical lines are sometimes distorted because the original is wavy and is not completely
pressed against the exposure glass by the platen cover or DJF/RDH.
Note: This is the same situation as previous models (F30 series, F40)
< Countermeasure>
Instruct the customer to press the original against the exposure glass by using a weight,
such as a paper package.
8. Sorter stapler installation environment
< Phenomenon>
When direct sunlight strikes the bin jam sensor (a photo transistor), it causes a sensor
malfunction, and the machine does not staple even if staple mode is selected.
< Countermeasure>
1) Avoid installing the machine under direct sunlight
2) Install a piece of mylar around the bin-jam sensor (photo-transistor) to protect from
direct sunlight.
Technical Bulletin No. RTB-006
SUBJECT: F400/F410 Troubleshooting DATE:Nov.30, ’93
PAGE: 7 of 10
9. DJF Original Skew
< Phenomenon>
If original skews occur as illustrated even if the DJF height is correctly adjusted, perform
the following adjustment.
Rear
Left scale
< Possible cause>
This skew is caused because the transport belt is faster than the feed-in motor speed,
even if both motor speeds are within the specification.
< Countermeasure>
1. Feed-in motor speed adjustment
Adjust the feed-in motor speed so that the motor speed becomes higher (within
specification).
1–1 Turn DIP SW 101-1, 2, 4 to "ON".
1–2 Turn DIP SW 102-1 to "ON".
1–3 Turn VR 103 towards "H" to turn LED 101 (Red) on.
1–4 Turn VR 103 towards "L" to turn LED 102 (Green) on.
2. Transport belt motor speed adjustment
Adjust the transport belt motor speed so that the motor speed becomes lower (within
specification).
1–1 Turn DIP SW 101-1, 2, 4 to "ON".
1–2 Turn DIP SW 102-2 to "ON".
1–3 Turn VR 104 towards "L" to turn LED 103 (Red) on.
1–4 Turn VR 104 towards "H" to turn LED 102 (Green) on.
Technical Bulletin No. RTB-006
No good
SUBJECT: F400/F410 Troubleshooting DATE:Nov.30, ’93
PAGE: 8 of 10
10. Sorter Stapler Entrance jam
< Phenomenon>
If the mylar is set incorrectly, paper jams frequently occur around the sorter stapler
entrance.
Good
< Countermeasure>
Set the mylar in the correct position without buckling, curling or waving.
Technical Bulletin No. RTB-006
No good
SUBJECT: F400/F410 Troubleshooting DATE:Nov.30, ’93
PAGE: 9 of 10
11. Abnormal LCD panel indication
< Phenomenon>
The copy counter indicates "8" even if another key (for example, the clear modes key) is
pressed. For instance, if the clear modes key is touched three times, the copy counter
indicates 888.
< Possible cause>
The grounding wire terminal is touching the operation panel board circuit pattern.
When the operation panel is opened while the grounding screws are left secured to the
machine frame, if the grounding wire is pulled strongly (this is especially possible when the
guidance ROM is pushed in the socket) the terminal may be rotated and bent. If the bent
terminal is pressed against the insulating sheet, it cuts part of insulating sheet and touches
the legs of electrical elements behind the insulating sheet, resulting in a short-circuit.
Good
< Countermeasure>
Correct the bent terminal and repair the insulating sheet with insulating tape such as teflon
tape.
Especially, be careful when you install the guidance ROMs at installation.
Technical Bulletin No. RTB-006
SUBJECT: F400/F410 Troubleshooting DATE:Nov.30, ’93
PAGE: 10 of 10
12. PCBs or Power packs damage
< Possible causes>
When units such as drum unit or transfer belt unit are removed while the main switch is
turned on, electrical noise or surge current might occur, resulting in PCB damage.
< Countermeasure>
Replace the damaged PCB or power pack.
CAUTION: Turn off the main switch before disconnecting the connector
or removing the unit.
13. SC548 (Additional information for page 6-17 in the service manual)
< Countermeasure>
If this occurs, before replacing the optics PCB and main control board, check the
connection between the main harness and the relay harness (drawer connector terminals)
and the connection between the relay harness and the thermistor (2P connector).
Technical Bulletin No. RTB-007
SUBJECT: SC502, 508, 510, 511 DATE:Nov.30, ’93
PAGE: 1 of 3
PREPARED BY: S.MANO
CHECKED BY:
CLASSIFICATION:
Action Required
Troubleshooting
Retrofit Information
< Phenomenon >
SC502, 508, 510, 511
< Possible causes >
When the tandem tray is closed roughly, it bounces slightly to the front. This breaks the
connection of the drawer connectors at the right or left tandem tray.
< Countermeasure >
1. Field countermeasure
Revision of service manual
Information only
Other
FROM: Copier Technical Support Group
MODEL: F400/F410
Instruct the customer to gently push in the tandem tray until it stops.
Also instruct the customer to do the following operation if the problem occur:
After drawing-out then pushing in the tandem tray, turn the main switch off and on.
Apply grease (silicone grease G-501) to the following points (see the illustrations in the
following pages). This reduces the friction between the tandem tray and the guide rail to
make the drawing operation of the tandem tray smoother. This helps the lock lever to
position the tandem tray at the correct position. In other word, if the tandem tray bounces
slightly to the front, the lock lever pushes the lock plate to move the tray back to the
correct position.
Technical Bulletin No. RTB-007
SUBJECT: SC502, 508, 510, 511 DATE:Nov.30, ’93
PAGE: 2 of 3
Point # 2
Point # 1
Lock Lever
Lock Plate
Point # 1 : The upper edge of the lock plate
Point # 2 : The surface of the lock lever roller where touching the lock plate
Point # 3
Point #4
Point #5
Point # 3 : Positioning Pin
Point # 4 & # 5 : Guide Rails
Technical Bulletin No. RTB-007
SUBJECT: SC502, 508, 510, 511 DATE:Nov.30, ’93
PAGE: 3 of 3
2. Production machine countermeasure
To improve the accuracy of the tandem tray lock position, the following improvement will
be implemented in the mass-production machines. (Please refer to Modification Bulletin for
cut-in serial numbers. An MB will be issued as soon as the modification is implemented.)
1. Grease is applied at the factory as described in the previous page.
2. Also to make the tray movement smoother, the roller [A] on the lock lever is changed
from a resin roller to metal roller with ball bearings.
[A]
[B]
[C]
3. The spring [B] tension applied to the tray lock lever is increased from 1.5kgf to 3.0kgf
(spring is changed).
Because the spring tension is increased, to keep the tandem tray drawing force constant,
the lock plate [C] shape is flatter.
[C]
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