Ricoh A023 Technical Bulletin
Technical Bulletin No. RTB-013
SUBJECT: Retrofit for Transfer Current Leakage DATE: Mar.15,1991
PAGE: 1 of 5
PREPARED BY: M.Ishihara
CHECKED BY:
CLASSIFICATION:
Action Required
Troubleshooting
Retrofit Information
1. SYMPTOM
Light or fuzzy image copy appears due to leaking of the transfer corona current.
The red LED on the transfer/separation power pack lights during copying cycles.
2. POSSIBLE CAUSES
2-1 Foreign matter
There is mylar under the guide plate shown in Fig.1. Glue comes out to the side of the
mylar and foreign matter adheres to this glue. Transfer current leaks from wire to this
foreign matter.
Revision of service manual
Information only
Other
FROM: Copier Tech Support Sec.
MODEL:J1
Fig 1
Rough Edge
Foreign Matter
There is a rough edge at the top of the plate between transfer and separation sections.
(See Fig.2)
A foreign matter sticks to this rough edge and transfer current leaks from wire to this
foreign matter.
2-2 Wire vibration
Wire will always vibrate with a certain amplitude when transfer charge voltage is applied.
Wire amplitude changes depend on wire tension and current frequency. The larger
amplitude becomes the narrower distance between the corona casing and the wire and it
makes easier to leak.
Fig 2
Foreign Matter
Technical Bulletin No. RTB-013
SUBJECT: Retrofit for Transfer Current Leakage DATE: Mar.15,1991
PAGE: 2 of 5
3. COUNTERMEASURE
3-1 Retrofit kit parts
P/N. Description
A0239450 T/S Corona Retrofit Kit
Note: A0239450 is arranged as retrofit kit for the specific field. Therefore the kit
(A0239450) is no longer available as service parts but the following component
parts are available as service parts.
Q’ty/Machine P/N Description
1
1
1
1
A0233857
A0233858
AA060124
AD020044
Teflon Tape-13mm
Teflon Tape-6mm
Tension Spring
Corona Wire
3-2 Procedure for the retrofit parts installation
1. Open the middle unit.
2. Disconnect the connectors of transfer, separation,and ground on the T/S corona unit
and remove the unit from the main frame. (See Fig. 3.)
Fig 3
3. Remove the left and right casing of the corona unit and remove the transfer wire.
Technical Bulletin No. RTB-013
SUBJECT: Retrofit for Transfer Current Leakage DATE: Mar.15,1991
PAGE: 3 of 5
4. Clean the plate between transfer and separation sections with alcohol.
5. Peel off the yellow backing of the 6 mm wide teflon tape (A0233858).
6. Place the center of the teflon tape to the top of the plate between transfer and
separation section. (See Fig. 4.)
Fig 4
7. Stick the tape as shown above. Cover the whole edge between end blocks.
Caution: If the tape is stuck incorrectly,foreign matter may stick to the glue and it is
possible that the leak occurs.
In the future,the plate between transfer and separation sections in the corona unit will be
changed to hemming bent instead of 6 mm wide teflon tape. (See Fig. 5)
Hemming Bent
Fig 5
Technical Bulletin No. RTB-013
SUBJECT: Retrofit for Transfer Current Leakage DATE: Mar.15,1991
PAGE: 4 of 5
8. Peel off the yellow backing of the 13 mm teflon tape (A0233857) and stick it to the
transfer guide plate as shown in Fig.6.
Fig 6
Caution: Stick the tape evenly. If there is a tape buckle on the upper side of the
guide plate,it is possible that this part touch the drum and will cause damage.
9. To reduce the vibration of the transfer wire, increasing the wire tension is effective.
In order to increase wire tension, we made tighter tension spring and short length type
transfer wire. Also we remove carbon coat on the surface of the transfer wire to
prevent current leakage.
Install the corona wire (AD020044) and the tension spring (AA060124) shown in Fig. 7.
Fig 7
Technical Bulletin No. RTB-013
SUBJECT: Retrofit for Transfer Current Leakage DATE: Mar.15,1991
PAGE: 5 of 5
The retrofit parts have been applied to the production machines at the factory as follows.
For. Cut-in Serial Number Starting Month
Ricoh
Bruning
Hoechst
Regma
25601200019360120001667011000128800459-
December,1990
December,1990
December,1990
December,1990
Technical Bulletin No. RTB-014
SUBJECT: Technical Information on the Rear Feeder DATE: Mar. 15, ’99
PAGE: 1 of 9
PREPARED BY: M. Ishihara
CHECKED BY:
CLASSIFICATION:
Action Required
Troubleshooting
Retrofit Information
1. SPECIFICATIONS
Size of Original: Maximum: 914 x 3,600 mm
Minimum: 182 x 257 mm
Maximum Passage Width: 1,030 mm
Maximum Thickness of Original: 1 mm
Minimum Thickness of Original: 0.035 mm
Weight: 3.1 kg
Dimensions (W x D x H): 1,350 mm x 120 mm x 60 mm
FROM: Copier technical support section
MODEL: J1
Revision of service manual
Information only
Other
Power Source: +24 volts and +5 volts from the copier
Technical Bulletin No. RTB-014
SUBJECT: Technical Information on the Rear Feeder DATE: Mar. 15, ’99
PAGE: 2 of 9
2. ELECTRICAL COMPONENT LAYOUT
4
1
2
3
SYMBOL NAME FUNCTION LOCATION
SW7 Rear Feeder Switch Turns on when the rear feed table is
opened.
S20 Rear Feed Detector Detects when an original is inserted. 2
SOL12 Rear Original
Stopper Solenoid
PCB8 Rear Indicator
Panel
Moves the original stopper down to
prevent an original from being inserted.
Contains the paper and original insertion
indicators and the original stop key.
1
3
4
Technical Bulletin No. RTB-014
SUBJECT: Technical Information on the Rear Feeder DATE: Mar. 15, ’99
PAGE: 3 of 9
3. BASIC OPERATION
Basic operation using the rear feeder is same as main copier exept the following points.
1. When the rear feeder opens the rear feeder switch turns on so that the copy exit way
indicator changes from upper way to lower automatically.
2. When the leading edge of the original passes the rear feed detector, the rear original
feed rollers turns and the original is fed straight into the exposure section.
3. When the rear feeder is used, multiple copy cannot be made.
Technical Bulletin No. RTB-014
SUBJECT: Technical Information on the Rear Feeder DATE: Mar. 15, ’99
PAGE: 4 of 9
4. INSTALLATION PROCEDURE
1. ACCESSORY CHECK
1
3
5
Make sure you have all the items listed below.
2
4
8
7
9
6
1. Rear Cover.................................................................................... 1 pc
2. Original Feed Table......................................................................1 pc
3. Microswitch...................................................................................1 pc
4. Original Stopper............................................................................ 1 pc
5. Left Leaf Spring ............................................................................ 1 pc
6. Right Leaf Spring.......................................................................... 1 pc
7. Shoulder Screw ............................................................................ 1 pc
8. Pan Head Screw - M4 x 6............................................................. 4 pcs
9. Installation Procedure................................................................... 1 pc
Technical Bulletin No. RTB-014
SUBJECT: Technical Information on the Rear Feeder DATE: Mar. 15, ’99
PAGE: 5 of 9
2. INSTALLATION PROCEDURE
[A]
[B]
[C]
[D]
[E]
1. Remove the middle left cover [A] (4 screws).
2. Remove the middle right cover [B] (4 screws).
3. Remove the right horizontal cover [C] (6 screws).
4. Remove the top left cover [D] (4 screws).
5. Remove the top right cover [E] (4 screws).
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