Ricoh ST24 Technical Bulletin

Technical Bulletin No. RTB-001
SUBJECT: MATT20 (A374) TROUBLESHOOTING GUIDE DATE:
PAGE: 1 of 20
PREPARED BY: CHECKED BY:
CLASSIFICATION:
Action Required Troubleshooting Retrofit Information
To aid the technician in troubleshooting matt20 misfeeds we are issuing this troubleshooting guide. If the guide is used properly it will resolve the majority of misfeeding problems the field is experiencing.
Revision of service manual Information only Other
FROM: Copier Technical Support Section
MODEL:
TABLE OF CONTENTS SYMPTOM TYPE
1. Roller Drive Motor Stalls and Paper Exit Jams.
2. Sorter Bin Jams or Copies out of order.
3. Paper Jam or Copies out of order.
4. Incorrect Bin Position and Bin Entrance Jams.
5. Proof Tray Jams with Thick Paper.
6. Sorter Stapler Paper Jams in Turn Gate Section. (RTB - 014)
7. Paper Jam at Sorter Stapler Entrance. (RTB - 009)
8. Sorter Entrance Jams with F400 only.
Technical Bulletin No. RTB- 001
SUBJECT: MATT20 (A374) TROUBLESHOOTING GUIDE DATE: June. 15 ’94
PAGE: 2 of 20
ROLLER DRIVE MOTOR STALLS AND PAPER EXIT JAMS
[Symptom]
In Sort/Stack mode, when copy paper is fed out to a bin, the roller drive motor speed should become higher. The motor occasionally hesitates at that moment and paper exit jam occurs.
[Possible Cause]
The load of the roller drive motor is excessive when the roller shafts and bushing became dirty, the friction between the roller shafts and bushings exceeds the roller drive motor torque.
[Action Required]
1. Lubricate the drive parts using launa oil. (See page 2 4) NOTE :If the drive parts have not been initially cleaned with alcohol, clean them before
lubricating.
NOTE: If the same symptom appear within 1PM even after the lubrication, perform the
Action 2.
2. Increase the drive motor torque. (See page 5 6)
Technical Bulletin No. RTB-001
SUBJECT: MATT20 (A374) TROUBLESHOOTING GUIDE DATE: June. 15 ’94
PAGE: 3 of 20
LUBRICATION
[B]
[A]
[C]
To reduce the load to the roller drive motor, lubricate as follows at every PM:
1. Open the sorter stapler then disconnect the link lever [A] (1 stepped screw).
2. Disconnect the sorter stapler interface harnesses and a grounding wire (1 screw).
3. Remove the sorter stapler from the mounting frame.
4. Remove the proof tray [B] (1 screw).
5. Remove the rear covers [C] (6 screws).
Technical Bulletin No. RTB-001
SUBJECT: MATT20 (A374) TROUBLESHOOTING GUIDE DATE: June. 15 ’94
PAGE: 4 of 20
[A]
[A]
[D]
[C]
[D]
[C]
[B]
6. Lubricate the bushings [A] with launa oil. NOTE: Lubricate the bushings from the both sides so that the oil is fully supplied between
the shaft and the bushing.
7. Gently push down the support bin [B] then lubricate the rollers [C] with launa oil. NOTE: Lubricate the inner side of the brackets [D] so that launa oil is fully supplied
between the shaft and the roller.
Technical Bulletin No. RTB-001
SUBJECT: MATT20 (A374) TROUBLESHOOTING GUIDE DATE: June. 15 ’94
PAGE: 5 of 20
[A]
[A]
[D]
[C]
[E]
[B]
[B]
8. Lubricate the bushings [A] with launa oil. NOTE: Lubricate the bushings from the both sides so that the oil is fully supplied between
the shaft and the bushing.
9. Lubricate the bushings [B] and gear pulley [C] with launa oil. NOTE: Place a sheet of paper underneath the bushing so that the oil does not drop on
the guide plate. Wipe off excess oil so that launa oil does not drop on the guide plate during
copying.
10. Lubricate the pulse generator disc [D] and idle pully [E] with launa oil.
Technical Bulletin No. RTB-001
SUBJECT: MATT20 (A374) TROUBLESHOOTING GUIDE DATE: June. 15 ’94
PAGE: 6 of 20
DRIVE MOTOR TORQUE INCREMENT
To increase the drive motor torque, replace the main control board with the upgraded board as mentioned below:
1. Remove the proof tray (1 screw) and the rear cover (4 screws).
2. Replace the main control board (1 screw, 5 support studs).
3. Reassemble the machine.
If you have equipment to modify the board, upgrade the main control board as follows:
A. If your main control board is A3745100:
R102
R103
C109
A-1. Replace R102 [A] with a 1.5K resistor. (from 2.4K to 1.5KΩ) A-2. Replace R103 [B] with a 620 resister. (470 to 620Ω) A-3. Change the main ROM to ROM part # A3745113.
Technical Bulletin No. RTB-001
SUBJECT: MATT20 (A374) TROUBLESHOOTING GUIDE DATE: June. 15 ’94
PAGE: 7 of 20
B. If your main control board is A3745105:
R104 R105 C110
B-1. Replace R104 [C] with a 1.5K resistor. (2.4K to 1.5KΩ) B-2. Replace R105 [D] with a 470 resister. (470 to 620Ω) B-3. Change the main ROM to ROM part # A3745113.
CAUTION: The interchangeability of the Main ROM is X/O. Whenever the R102 and R103 (R104 and R105) are replaced, the main ROM must be replaced by the new ROM.
Technical Bulletin No. RTB-001
SUBJECT: MATT20 (A374) TROUBLESHOOTING GUIDE DATE: June. 15 ’94
PAGE: 8 of 20
SORTER BIN JAMS OR COPIES OUT OF ORDER
[Symptom]
The copy’s trailing edge [A] remains on the guide mylar [B]. When the following paper [C] comes to the bin, it hits the trailing edge of the proceeding paper, resulting in the paper jam, or incorrect copy order when the following paper goes underneath the proceeding paper.
[A]
[C]
[B]
[Cause]
The technician bent the lower bin exit roller holder (spring plate) ( P/N : A3742163) [D], trying to correct the normal paper skew when the paper exits into the bins. This reduces the paper transport ability causing bin jams.
[D]
Technical Bulletin No. RTB-001
SUBJECT: MATT20 (A374) TROUBLESHOOTING GUIDE DATE: June. 15 ’94
PAGE: 9 of 20
Supplemental Technical Explanation about the way how paper is
stacked in the bin.
When the copy paper comes out of the sorter, it is angled. This is normal for proper stacking of the copy paper.
[Mechanism of Paper Stacking]
1. As shown in the illustration, the front side of paper [A] comes out of the sorter first. NOTE: In order to angle the paper, the diameter of the front and rear transport rollers [B]
are slightly different (front roller: 20.0mm [a], rear roller : 19.7mm [b]).
2. After the entire sheet comes out of the sorter, the paper slides back to the rear fence, being supported by the gravity for smooth slide.
3. When the corner [C] of the paper contacts the rear fence [D], the paper is still slightly angled.
4. At this moment, the jogger bar [E] pushes the paper to the front.
5. Because only one corner of the copy paper is touching the rear fence (minimal friction), the paper can be jogged smoothly.
6. Finally the paper sits squared in the bin because the paper stops being aligned by the front side frame [F]
[Solution]
Straighten the lower bin exit roller holders so they are flat and ensure that the paper comes out of the sorter with the correct angle.
NOTE: Once the holders are bent, it may be difficult to completely straighten the holders.
In such a case, replace the entire lower bin exit rollers.
[A]
[C]
[D]
[E]
[a]
[b]
[B]
[F]
Technical Bulletin No. RTB-001
SUBJECT: MATT20 (A374) TROUBLESHOOTING GUIDE DATE: June. 15 ’94
PAGE: 10 of 20
BIN JAM OR COPIES OUT OF ORDER
Fig. 1 (Correct action)
[Symptom]
When the paper slides back against the end fence, the trailing edge of the paper enters the gap between the guide mylar and the upper bin. Thus, the paper is stacked incorrectly in the bin, or in the worst case, the next sheet of paper jams or goes underneath the proceeding paper (copies out of order) (see Fig. 2).
Fig. 3 (Incorrect condition)
[Cause]
Fig. 2
[B]
[A]
Fig. 4 (Correct condition)
Fig. 5
The paper has a face-up curl and the guide mylar [A] is not touching the projection [B] on the upper bin.
Ideally, if the gap between the guide mylar and the upper bin is zero, the paper can not enter between the guide mylar and the upper bin when it slides down against the end fence. This is normal operation. However, if there is a gap which is big enough to allow the curled edge of paper to enter between the guide mylar and the upper bin (see Fig. 5) the above symptom may occur.
Technical Bulletin No. RTB-001
SUBJECT: MATT20 (A374) TROUBLESHOOTING GUIDE DATE: June. 15 ’94
PAGE: 11 of 20
[Solution]
If the above symptom is observed in the field with the customer application, check which bin(s) have gap(s) which creates the problem. Follow the checking procedure described below to determine which bins should be replaced.
[A]
Incorrect
Incorrect
Fig. 1
Correct
Fig. 2
1. Turn on the copier main switch.
2. Remove the sorter rear cover and turn on the DIP switch 100-1 and -2 to start the sorter free run.
3. Using a flash light, observe the mylar condition from both the front and rear angles.
4. If there is a gap above guide mylar of each bin, put any mark for the bin with the gap.
Correct
Fig. 3
NOTE: The both ends of the mylar (50mm from the edge) do not have to touch the upper
bin. Just mark the bins which have the gaps at the center. After the observation is completed, replace the marked bins (see page 38 of the Service Manual).
NOTE: The old bin (P/N A3743505) and the new bin are slightly different in shape.
Although it is technically no problem to mix the old and new bins, it is recommended to use the new bins for upper position and the old bins for lower position. This is to maintain the good appearance of the bins and to use new bin for the position which are more frequently used.
Technical Bulletin No. RTB-001
SUBJECT: MATT20 (A374) TROUBLESHOOTING GUIDE DATE: June. 15 ’94
PAGE: 12 of 20
NOTE: Before installing new bins, lubricate the four points [A] on each bin using grease
501.
[A]
[A]
NOTE: Install the bin links (A3743550) [B] so that the screw [C] is at the top of the hole
[D].
[B]
[D]
[C]
Technical Bulletin No. RTB-001
SUBJECT: MATT20 (A374) TROUBLESHOOTING GUIDE DATE: June. 15 ’94
PAGE: 13 of 20
INCORRECT BIN POSITION AND BIN ENTRANCE JAMS
[Symptom]
The 1st copy hits the support bin causing a bin entrance jam.
[Possible Cause]
Due to gap between the projection [A] of the bin support block [B] and the side frame, the block can move in the arrow [C] direction. If the block moves away from the bin home position sensor [D] when the sensor should be actuated, the bin will not stop at the correct home position. In this case a paper jam occurs at the bin entrance.
[B]
[A]
[D]
[Permanent Countermeasure]
From the march ’93 production, the width of the interrupter [E] for the bin home position sensor has been increased from 4.5mm to 5.5mm to ensure sensor actuation.
[Countermeasure in the field]
To modify the machines in the field, stick a black mylar strip (5.5mm x 17mm) [F] as shown in the illustration to expand the width of the sensor actuator.
NOTE: Align the upper and right side edges of the mylar with the sensor actuator.
The part number of the black mylar strip is A3749500.
[C]
[E]
4.5mm
[F]
Front view from paper path
5.5mm
Technical Bulletin No. RTB-001
SUBJECT: MATT20 (A374) TROUBLESHOOTING GUIDE DATE:
PAGE: 14 of 20
PROOF TRAY JAMS WITH THICK PAPER
[Symptom]
When thick paper (like a post card) is used in the proof tray mode, the paper might not be fed onto the proof tray. The paper stops just before reaching the exit roller [A].
[Cause]
If the paper is face curled, the leading edge of the paper hits the exit roller guide [B] and the paper does not reach the exit rollers [A].
[Countermeasure]
A hexagon nut (07100050B) [C] has been inserted between the plate spring [D] and the exit roller guide, so that the angle [θ] between the guide and paper has been reduced. Due to this modification, the length of the screw [D] fixing the plate spring has been changed from 6 mm to 8 mm. This modification has been applied from the March ’94 production.
[D]
ϑ
ϑ
[B]
[A]
[C]
1
Technical Bulletin No. RTB-001
SUBJECT: MATT20 (A374) TROUBLESHOOTING GUIDE DATE:
PAGE: 15 of 20
The procedure to apply this modification is as follows:
1. Remove the front and rear covers of the Matt20.
2. Remove the upper cover [A] (2 screws).
3. Remove the two screws [B] fixing the spring plates [C].
4. Insert a hexagon nut (07100050B) between the each plate spring and the exit roller guide mylar. Fix them using a Philips truss head screw - M4x8 (03440080F).
[A]
[C]
[B]
Technical Bulletin No. RTB-001
SUBJECT: MATT20 (A374) TROUBLESHOOTING GUIDE DATE:
PAGE: 16 of 20
PAPER JAMS IN TURN GATE SECTION (A7 Series RTB No. - 014)
(N440 Series RTB No. - 005)
[PHENOMENON]
Paper jams occur in the turn gate section [A] intermittently in sort, stack, or staple mode.
[POSSIBLE CAUSE]
The sorter adapter lower exit roller [B] has a stiffness increasing roller [C] at the middle. This rubber roller has a
flange on each end. The flanges produce slight waves on copy paper perpendicular to the paper transport direction to increase paper stiffness. The rear side wave position may not be proper for one of the ribs on the sorter stapler vertical paper guide [D] especially when paper has excessive face curl. The rib may make a mark on the paper lead edge or may cause paper jams.
[ACTION IN THE FIELD]
1. Cut off the rear flange [E] with cutting pliers and smooth the roller’s edge with a knife. This will
eliminate the rear side wave on paper. (As the flanges have wedge grooves originally and the roller is turning in forwarding direction, the roller surface does not have to be completely smooth after you cut off the flange.)
[A]
[D]
[C]
2. If step 1 does not cure the problem, cut off the front flange [F] as well. (Paper transport reliability without flanges on the roller was tested for thin paper under high humidity condition, resulting in no problem.)
[PERMANENT COUNTERMEASURE]
The width of the rib on the sorter stapler vertical paper guide will be increased to improve the paper transport ability. The part number of the vertical paper guide will remain as it is. This modification will be applied to the production machines from April,1993.
[B]
[E]
[F]
Technical Bulletin No. RTB-001
SUBJECT: MATT20 (A374) TROUBLESHOOTING GUIDE DATE:
PAGE: 17 of 20
PAPER JAM AT SORTER STAPLER ENTRANCE (N440 ONLY RTB No. - 009)
[Symptom]
On the N440 + Matt20 system, the copier CPU sometimes does not recognize the Matt20 when the main switch is turned on. Under this condition, the "C5" code is not displayed on the operation panel even if the sorter unit or the sorter front cover is opened. When copies are made, paper jams will occur between the sorter adapter and the sorter entrance as the sorter roller drive motor does not rotate. Even when this happens, no jam indication is displayed since the copier is operating without recognizing the Matt20.
This problem may occur on some machines. According to information from the field, copiers with main control board A0855111G or A0855151 might have this problem, but not all copiers with them. On the machines with this problem, the symptom is observed for approximately 50% times when the main switch is turned off and on.
When the menu sheet reader is installed, this problem disappears.
[Cause]
When the main switch is turned on, the communication IC (MB89371) on the optional interface (I/F) board does not reset, resulting in a communication error with the Matt20. When the menu sheet reader is not equipped, the reset circuit of the main control board for the communication IC will include an open circuit through the I/F board. Under this condition electrical noise might affect the reset circuit, causing a reset error to the communication IC.
[Countermeasure in the field]
Install a jumper connector (P/N: A0889500) on the CN702 (the connector for the menu sheet reader) of the I/F board which makes a short circuit between CN702-1 and CN702-4 with 2.2k ohms resistor. This connector has the same effect as when the menu sheet reader is equipped, eliminating the problem.
[Permanent countermeasure]
The I/F board circuit has been modified from August
1993.
A0889500
Technical Bulletin No. RTB-001
SUBJECT: MATT20 (A374) TROUBLESHOOTING GUIDE DATE:
PAGE: 18 of 20
[Other information]
This problem won’t occur on the A7 + Matt20 system as the reset circuit pattern of the main control board for the communication I/C is independent from the menu sheet reader circuit.
It won’t cause any problem if the jumper connector is installed on a new I/F board or on the A7 system by mistake.
Neither the software of the copier main ROM nor the main control board have any relation to this problem. But the type and manufacturer of the main ROM might affect the occurrence ratio of this problem. The following are our test results:
Manufacturer Type
AMD am27c010-150DC 21/30 AMD am27c010-155DC 0/30
Hitachi HN27c101AG-17 0/30
SGS M27c1001-12FI 0/30
Occurrence
Ratio
Technical Bulletin No. RTB-001
SUBJECT: MATT20 (A374) TROUBLESHOOTING GUIDE DATE:
PAGE: 19 of 20
SORTER ENTRANCE JAMS WITH F400 ONLY
[Symptom]
In the combination of the F400 and Matt20, paper jam occurs at the exit of the copier main body if the paper is face curled.
[Possible Cause]
The leading edge of the curled paper is caught between the entrance guide plate-upper [A] and the upper support guide [B].
[Countermeasure]
The exit pawl guide mylar (A3742266) [C] has been added on the guide plate from the February ’94 production.
[A]
[B]
The procedure to apply this modification is as follows:
1. Remove the sorter stapler and the mounting bracket from the copier (2 connectors, 1 grounding wire, 5 screws).
2. Remove the upper support guide [D] (2 screws).
3. Stick the exit pawl guide mylar [E] on the upper support guide.
NOTE: The edge of the mylar should be aligned with the edge of the upper support guide.
[D]
[C]
[E]
Technical Bulletin No. RTB-001
SUBJECT: MATT20 (A374) TROUBLESHOOTING GUIDE DATE:
PAGE: 20 of 20
TURN GATE AREA MISFEEDS
[Symptom]
Paper jams in turn gate - area
[Cause]
1. The bin transport rollers [A] (P/N A3742163) are bent.
2. The entrance guide plate - lower [B] (P/N A3742131) is bent.
3. The technician removes the pressure springs (P/N AA063164 [C], P/N AA066130 [D] P/N AA066131 [E]) of the upper rollers in the sorter adapter.
[Solution]
1. Straighten bin transport roller bracket so it is flat.
2. Replace or reform entrance guide plate - lower to it’s original shape.
3. Install the pressure springs.
[A]
[B]
[C]
[C]
[E]
[D]
Technical Bulletin No. RTB-023
SUBJECT: Sorter Stapler (Matt20: A374)
Paper Exit Jam
PREPARED BY: J. Mochizuki CHECKED BY:
CLASSIFICATION:
Action Required Troubleshooting Retrofit Information
Revision of service manual Information only Other
FROM: 2nd Technical Support Section
MODEL:
F400/F410
DATE: Feb.15,’94 PAGE: 1 of 2
Symptom:
In Sort/Stack mode, when copy paper is fed out to a bin, the roller drive motor speed becomes higher. The motor occasionally hesitates at that moment, paper exit jam occurs.
Possible Cause:
The load of the roller drive motor is too large. The friction between the shafts and bearings exceeds the roller drive motor torque.
Action Required:
1. Lubricate the the following parts using launa oil.
1) Between the bushings [A] and shafts
2) Between the exit rollers [B] and the shafts [C]
[B]
[C]
[A]
[A]
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