Ricoh A374 Technical Bulletin ST24

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 1.5KΩ resistor. (from 2.4KΩ to 1.5KΩ)
A-2. Replace R103 [B] with a 620Ω resister. (470Ω to 620Ω)
A-3. Change the main ROM to ROM part # A3745113.