Ricoh df75 SPECIFICATIONS
AUTO REVERSE DOCUMENT FEEDER
(
Machine Code:
B386)
10 August, 2001 SPECIFICATIONS
1. OVERALL MACHINE INFORMATION
1.1 SPECIFICATIONS
Original Size: Standard sizes
Single-sided mode: A3 to A5, DLT to HLT
Double-sided mode: A3 to A4, DLT to LT
Non-standard sizes (Single-sided mode only)
Max. width 297 mm
Min. width 105 mm
Max. length 1260 mm
Min. length 128 mm
Original Weight: Single-sided mode: 52~128 g/m2,14~34 lb
Double-sided mode: 52~10 5 g/m2,14~28 lb
Table Capacity: 30 sheets (70 kg)
Original Standard Position: Center
Separation: FRR
Original Transport: Roller transport
Original Feed Order: From the top original
Reproduction Range: 25 to 200 % (Sub scan direction only)
Power Source: 24 & 5 Vdc from the copier
Power Consumption: 50 W
Dimensions (W x D x H): 550 x 470 x 110 mm
Weight: 10 kg
B386-1
Options
MECHANICAL COMPONENT LAYOUT 10 August, 2001
1.2 MECHANICAL COMPONENT LAYOUT
2
3456789
1
1. Separation Roller
2. Paper Feed Belt
3. Pick-up Roller
4. Original Set Sensor
B386D201.WMF
11 1012131415181917 16
11. Reverse Roller
12. Junction Gate
13. Exit Roller
14. Original Exit Sensor
5. Original Trailing Edge Sensor
6. Original Width Sensor Board
7. Original Length Sensor 1
8. Original Length Sensor 2
9. Original Table
10. Reverse Table
15. Stamp
16. 2nd Transport Roller
17. Original Exposure Guide
18. Registration Sensor
19. 1st Transport Roller
B386-2
10 August, 2001 ELECTRICAL COMPONENT LAYOUT
1.3 ELECTRICAL COMPONENT LAYOUT
16
15
14
13
1. DF Feed Clutch
12
17
11
1
2
3
4
5
6
7
8
9
10
B386D202.WMF
10. DF Feed Motor
2. Feed Cover Sensor
3. Original Width Sensor Board
4. Original Length Sensor 1
5. DF Pick-up Solenoid
6. Original Length Sensor 2
7. Junction Gate Solenoid
8. DF Drive PCB
9. DF Position Sensor
11. DF Transport Motor
12. Original Exit Sensor
13. Stamp Solenoid
14. Original Trailing Edge Sens or
15. Original Set Sensor
16. Original Reverse Sensor
17. Registration Sensor
Options
B386-3
ELECTRICAL COMPONENT DESCRIPTION 10 August, 2001
1.4 ELECTRICAL COMPONENT DESCRIPTION
Symbol Name Function
Motors
M1 DF Feed Drives the feed belt, separation, pick-up, and
reverse table rollers.
M2 DF Transport Drives the transport and exit rollers 11
Sensors
S1 DF Position Detects whether the DF is lifted or not. 9
S2 Registration
S3 Feed Cover Open
Sensor
S4 Original Width
Sensor Board
S5 Original Length - 1 Detects the original length. 4
S6 Original Length - 2 Detects the original length. 6
S7 Original Set Detects if an original is on the feed table. 15
S8 Original Exit
S9 Original Trailing
Edge
S10 Original Reverse
Sensor
Solenoids
SOL1 DF Pick-up
SOL2 Stamp Energizes the stamper to mark the original. 13
SOL3 Junction Gate Opens and closes the junction gate. 7
Detects the leading edge of the original to turn
off the DF feed and transport motors, detects
the original exposure timing, and checks for
original misfeeds.
Detects whether the feed-in cover is opened or
not.
Detects the original width. 3
Detects the leading edge of the original to turn
on the junction gate solenoid and checks for
original misfeeds.
Detects the trailing edge of the original to turn
off the transport and feed motor and junction
gate solenoid.
In single-sided mode, used to detect original
misfeeds.
Detects the trailing edge of the last original to
stop copy paper feed and to turn off the
transport motor, and checks for original
misfeeds.
Detects when the original is fed from the
reverse area during duplex scanning.
Controls the up-down movement of the original
table.
Index
No.
10
17
2
12
14
16
5
Clutches
MC1 DF Feed Transfers transport motor drive to the pick-up
roller and feed belt.
PCBs
PCB1 DF Drive
Interfaces the sensor signals with the copier,
and transfers the magnetic clutch, solenoid and
motor drive signals from the copier.
B386-4
1
8
10 August, 2001 DRIVE LAYOUT
1.5 DRIVE LAYOUT
2
1
10
9
1. Separation Roller
2. Original Feed Belt
4
3
5
6
8
7
B386D203.WMF
6. DF Feed Motor
7. Reverse Table Roller
3. Pick-up Roller
4. DF Feed Clutch
5. DF Transport Motor
8. 2nd Transport Roller
9. Exit Roller
10. 1st Transport Roller
Options
B386-5
ORIGINAL SIZE DETECTION 10 August, 2001
2. DETAILED SECTION DESCRIPTIONS
2.1 ORIGINAL SIZE DETECTION
[A]
[B]
[C]
B386D503.WMF
The original size detection mechanism consists of the original width sensor board
[A] and two original length sensors-1 [B] and -2 [C]. Based on the combined output
of the length sensors and the width sensor board, the machine can detect the size
of the original. This integrated detection mechanism is detailed in the table on the
next page.
Note that the width sensor’s terminal plate is attached to the original guide, so the
widths of the originals must all be the same.
B386-6
10 August, 2001 ORIGINAL SIZE DETECTION
A3 (297 x 420)
B4 (257 x 364)
A4 (Lengthwise)
(210 x 297)
A4 (297 x 210)
(Sideways)
B5 (182 x 257)
(Lengthwise)
B5 (257 x 182)
(Sideways)
A5 (148 x 210)
(Lengthwise)
A5 (210 x 148)
(Sideways)
11" x 17" (DLT)
11" x 15"
10" x 14"
8.5" x 14" (LG)
8.5" x 13" (F4)
8" x 13" (F)
8.5" x 11"
(Lengthwise)
8.5" x 11"
(Sideways)
10" x 8"
(Lengthwise)
5.5" x 8.5"
(Lengthwise)
(HLT)
5.5" x 8.5"
(Sideways) (HLT)
NA EU
✗❍
✗❍
✗❍
✗❍
✗❍
✗❍
✗✗
✗❍
❍✗
❍✗
❍✗
❍✗
✗❍
❍❍
❍✗
❍✗
❍✗
❍✗
❍✗
Original
Width-1
LLON———ONON
LH—ON——ONON
HL——ON—ON—
LLON—————
HH———ONON—
LH—ON————
HH———ON——
HL——ON———
LLON———ONON
LLON———ONON
LH—ON——ON—
HL——ON—ON—
HL——ON—ON—
HL——ON—ON—
HL——ON—ON—
LLON—————
LH—ON——ON—
HH———ON——
HL——ON———
Original
Width-2
Original Width-3
P4 P3 P2 P1
Original
Length-1
Original
Length-2
Key
✗
: No, ❍: Yes
ON: Paper present
NA: North America, EU: Europe
NOTE: 1) P1-P4 represent the four positions on the width sensor board. ON
indicates the presence of the terminal plate in a given position. “Original
Width-1” and “Original Width-2” are the outputs from the sensor board to
the DF main board. The state of these outputs (L or H) depends on the
position of the terminal plate on the sensor board (P1, P2, P3, or P4).
For example, if the terminal plate is at P4, both outputs are L.
2) A reading of “L” on either of the width sensor outputs indicates that the
terminal plate is connecting the GND pattern with the width sensor
output signal line.
3) The machine cannot detect more than one size of originals in the same
job.
B386-7
Options
ORIGINAL SIZE DETECTION 10 August, 2001
Original Width Sensor Board
GND Pattern
Original Width 1
Original Width 2
Original Side
Guide Position
The signal is "L" when the terminal plate is connected to the GND pattern.
A3/A4S B4/B5S A4L/A5S B5L/A5L
P1P2P3P4
B386D501.WMF
B386-8
10 August, 2001 MIXED ORIGINAL SIZE MODE
2.2 MIXED ORIGINAL SIZE MODE
This section explains what happens when the user selects mixed original size
mode.
Because this ADF is a sheet-through document feeder, the method for original
document width detection is the same as when the originals are the same size, but
the document length detection method is different. Therefore, the scanning speed
is slightly slower.
Document length detection
From when the registration sensor switches on until it switches off, the CPU counts
the transport motor pulses. The number of pulses determines the length of the
original.
Feed-in cycle
When the original size for the copy modes listed below cannot be determined, the
image cannot be correctly scaled (reduced or enlarged) or processed until the
original’s length has been accurately detected. The length must be determined
before the image is scanned.
Auto Reduce/Enlarge
Centering
Erase Center/Border
Booklet
Image Repeat
The originals follow this path:
1. Length detection ! Scanning glass ! Inverter table
2. Inverter table ! Scanning glass ! Inverter table (restores the original order)
3. Inverter table ! Scanning glass (image scanned) ! Exit tray
Normal feed-in
In a copy mode other than those listed above, when the reduction/enlargement
ratio has been determined, the originals are scanned normally. In order to store the
scanned images, a large area of memory (the detected original width x 432 mm
length) is prepared. Next, only the portion of the image up to the detected original
length is read from memory and printed.
B386-9
Options
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