Ricoh df55 Service Manual

DOCUMENT FEEDER

(DF Type 55)

1 July, 1998 MECHANICAL COMPONENT LAYOUT

1. SPECIFICATIONS

Original Size: Standard Sizes A3 to A5

Non-standard Sizes

Max. width 297 mm
Min. width 105 mm
Max. length 864 mm

Min. length 128 mm
Original Weight : 45 g to 90 g
Table Capacity : 30 sheets (using 20 lb or 80 g/m2 paper)
Original Standard Position: Rear left corner
Separation: FRR
Original Transport: Roller transport
Original Feed Order: From top original
Reproduction Range: 50 to 155%
Power Source: 24 & 5 V dc from the copier
Power Consumption: 25 W
Dimensions (W x D x H): 550 x 470 x 120 mm
Weight: 9 kg

C578-1

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MECHANICAL COMPONENT LAYOUT 1 July, 1998

2. COMPONENT LAYOUT

2.1 MECHANICAL COMPONENT LAYOUT

1

10

98 7 6

1. Separation Roller

2. Paper Feed Belt

3. Pick-up Roller

4. Original Entrance Guide

5. Original Table

432

5

C578O005.WMF

6. Original Exit Roller

7. 2nd Transport Roller

8. DF Exposure Glass

9. Original Exposure Guide

10. 1st Transport Roller

C578-2

1 July, 1998 ELECTRICAL COMPONENT LAYOUT

2.2 ELECTRICAL COMPONENT LAYOUT

1

14

13

12

2

3

4

5

6

11

10

1. DF Feed Clutch

2. Feed Cover Open Sensor

3. DF Feed Motor

4. DF Pick-up Solenoid

5. DF Drive PCB

6. DF Position Sensor

7. APS Start Sensor

8. Original Length Sensor 2

7

8

9

C578O028.WMF

9. Original Length Sensor 1

10. Original Width Sensor 3

11. Original Width Sensor 2

12. Original Width Sensor 1

13. Original Set Sensor

14. Registration Sensor

C578-3

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ELECTRICAL COMPONENT DESCRIPTION 1 July, 1998

2.3 ELECTRICAL COMPONENT DESCRIPTION

Table

Index No. Name Function

Motors

3 DF Feed Drives all the rollers.

Sensors

7 APS Start Informs the CPU when the DF is opened

and closed (for platen mode) so that original
size sensors in the copier can check the
original size.

6 DF Position Detects whether the DF is lifted or not.

14 Registration Detects the leading edge of the original to

turn off the transport motor, detects the
original exposure timing, and checks for
original misfeeds.

2 Feed Cover Open

Sensor
12 Original Width - 1 Detects the original width
11 Original Width - 2 Detects the original width
10 Original Width - 3 Detects the original width

9 Original Length - 1 Detects the original length.
8 Original Length - 2 Detects the original length.

13 Original Set Detects if an original is on the feed table.

Detects whether the feed-in cover is opened
or not.

Solenoids

4 DF Pick-up Controls the up-down movement of the

original table.

Clutches

1 DF Feed Transfers transport motor drive to the pick-

up roller and feed belt.

Boards

5 DF Drive Interfaces the sensor signals with the copier,

and transfers the magnetic clutch, solenoid
and motor drive signals from the copier.

C578-4

1 July, 1998 DRIVE LAYOUT

2.4 DRIVE LAYOUT

7

6

5

4

3

1. DF Feed Clutch

2. DF Feed Motor

3. Exit Roller

4. 2nd Transport Roller

8

1

2

C578O004.WMF

5. 1st Transport Roller

6. Separation Roller

7. Original Feed Belt

8. Pick-up Roller

C578-5

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ORIGINAL SIZE DETECTION 1 July, 1998

3. DETAILED DESCRIPTIONS

3.1 ORIGINAL SIZE DETECTION

[D]

[B]

[C]

[E]

[A]

C578O006.WMF

The DF has three width sensors (- 1 [A], - 2 [B], and - 3[C]) to detect the original
width and two original length sensors (-1 [D] and -2 [E]) to detect the original
length. The DF detects the original size through the combination of those five
sensors as shown in the table on the next page.

C578-6