Ricoh DH400 Technical Bulletin

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’

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SUBJECT: F410 RDH Finisher system duplex method change

(manual corrections)

<RDH>

1 2

3 4

2 4

Fig 1

3’ 4’

1’ 2’

2’

3’ 4

Fig 2

❶

①

❷

DATE: SEP. 15. ’93 PAGE: 2 of 2

1’

Fig 3

❸ ❹

❸

④

1’

3’

②

1’

3’

④

❹

❸

④

②

1’

3’

❸

❶ ❷

❶

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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-017

SUBJECT: MANUAL CORRECTIONS DATE: Jan. 31,’94

PAGE: 9 of 13

Page 6-19 1.15

• Incorrect

1.15 DUAL JOB FEEDER

Definition: [Level:B]

Encoder pulse is not detected by the DJF main board......

Possible causes DJF feed motor defective

DJF transport motor defective DJF feed out motor defective DJF inverter motor defective

• Correct

1.15 DUAL JOB FEEDER/RECIRCULATING DOCUMENT HANDLER

Definition: [Level:B]

Encoder pulse is not detected by the DJF/RDH main board......

Possible causes DJF/RDH feed motor defective

DJF/RDH transport motor defective DJF/RDH feed out motor defective RDH inverter motor defective

Page 35 of RDH step #2

Since there is no LED cover, delete the cover [A] from the illustration and correct the following sentence.

•Incorrect Close the RDH and remove the LED cover [A] (1 screw).

•Correct Close the RDH.

[A]

Technical Bulletin No. RTB-019

SUBJECT: RDH Original Size Misdetection DATE:

February. 15,1994 PAGE: 1 of 10

PREPARED BY: S. MANO CHECKED BY:

CLASSIFICATION:

Action Required Troubleshooting Retrofit Information

When the RDH detects different original sizes on successive jobs, the RDH stops the operation and indicates an original jam.

REASON OF THE MISDETECTION

Revision of service manual Information only Other

[B]

FROM: Copier Technical Support Section

MODEL: RDH for F410

[C]

[A]

Original length is detected by the pulse generator sensor [A]. the RDH counts pulses from the point where the leading edge of the original activates the registration sensor [B] until the trailing edge of the original de-activates the registration sensor. The pulse count is compared with the reference data which is stored in the ROM to judge the original size.

The pulse generator wheel is driven by the driven pull-out roller [C]. From October to November 1993 production, grease was applied to the four driven roller

shaft holders. When this grease on the shaft holders is contaminated with paper dust, it increases the mechanical load to the driven pull- out roller shaft resulting in the slippage between this roller and the original.

Due to the slippage, the pulse count varies. Because of this pulse variation, it is possible that the RDH detect the original length incorrectly.

Technical Bulletin No. RTB-019

SUBJECT: RDH Original Size Misdetection DATE:

February. 15,1994 PAGE: 2 of 10

COUNTERMEASURES

• Software modification-1 To improve the original length size detection accuracy, the pulse number reference data

has been corrected. (ROM part number from A3785810C to A3785810D).

• Software modification-2 UK (8" x 10") size lengthwise and GT (8" x 10 1/2") size lengthwise paper are very similar

and it is very difficult to distinguish them by the pulse number. Therefore, the software has been changed to detect as only UK size lengthwise when

either of sizes is fed. (By changing the DIP switch combination, RDH can be set to detect GT lengthwise).

Since the mixed size original detection is not necessary for the RDH, this function was eliminated. RDH detects only the first original size for auto paper size selection, (ROM part number from A3785810D to A3785810F).

NOTE: The part number A3785810E does not exist.

• Mechanical modification (Driven pull-out roller holders) To reduce the pulse count variation, four holders of driven pull out roller have been

modified. To reduce the friction between the roller shaft and the holders, the inner diameter of the holders has been widened.

• Production procedure change The grease is not applied.

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