Ricoh df71 Service Manual
AUTO REVERSE DOCUMENT FEEDER
(Machine Code: B379)
20 February, 2001 MECHANICAL COMPONENT LAYOUT
1. OVERALL MACHINE INFORMATION
1.1 MECHANICAL COMPONENT LAYOUT
3 4 5 6 7 8
2
1
19
18
1617
15 14 13 12 11 10
1. Separation Roller
2. Paper Feed Belt
3. Pick-up Roller
4. Original Set 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
9
B379D201.WMF
11. Reverse Roller
12. Junction Gate
13. Exit Roller
14. Original Exit Sensor
15. Stamp
16. 2nd Transport Roller
17. Original Exposure Guide
18. Registration Sensor
19. 1st Transport Roller
Peripherals
B379-1
ELECTRICAL COMPONENT LAYOUT 20 February, 2001
1.2 ELECTRICAL COMPONENT LAYOUT
14
15
13
16
12
17
1
3
4
5
6
7
8
9
10
2
11
B379D202.WMF
1. DF Feed Clutch
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
10. DF Feed Motor
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
B379-2
20 February, 2001 DRIVE LAYOUT
1.3 DRIVE LAYOUT
4
3
1
10
9
1. Separation Roller
2. Original Feed Belt
3. Pick-up Roller
4. DF Feed Clutch
5. DF Transport Motor
2
5
6
8
7
B379D203.WMF
6. DF Feed Motor
7. Reverse Table Roller
8. 2nd Transport Roller
9. Exit Roller
10. 1st Transport Roller
B379-3
Peripherals
ORIGINAL SIZE DETECTION 20 February, 2001
2. DETAILED SECTION DESCRIPTIONS
2.1 ORIGINAL SIZE DETECTION
[A]
[B]
[C]
B379D503.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.
B379-4
20 February, 2001 ORIGINAL SIZE DETECTION
1 A3 (297 x 420)
2 B4 (257 x 364)
3 A4 SEF (210 x 297)
4 A4 LEF (297 x 210)
5 B5 SEF (182 x 257)
6 B5 LEF (257 x 182)
7 A5 SEF (148 x 210)
8 A5 LEF (210 x 148)
9 11" x 17"
10 11" x 15"
11 10" x 14"
1/2
12 8
13 8
1/2
" x 14"
" x 13"
14 8" x 13"
1/2
15 8
16 11" x 8
" x 11" SEF
1/2
" LEF
17 8" x 10" SEF
18 5
19 8
1/2
1/2
" x 8
" x 5
1/2
1/2
" SEF
" LEF
NA EU
✗❍
✗❍
✗❍
✗❍
✗❍
✗❍
✗❍
✗❍
1 ✗
❍
1
#
✗
❍✗
2 ✗
❍
#
4
4
✗❍
2
#
❍
3 ✗
❍✗
3
#
✗
❍✗
❍✗
Original
Length 1
ON ON - - - ON
ON ON - - ON ON - - ON - -
-----ON
ON - ON - - -
----ON-
--ON---
---ON-ON ON - - - ON
ON ON - - - ON
ON ON - - ON ON ON - ON - ON ON - ON - ON ON - ON - ON - - ON - -
-----ON
ON - - ON - -
--ON---
---ON--
Original
Length 2
P1 P2 P3 P4
NA: America (North, Middle, South) EU: Europe, Asia, China, Taiwan
✗: No ❍: Yes ON: Paper present
❍1, #1: In NA, original size 11" x 15" is detected as 11" x 17"
❍2, #2: In NA, original size 8" x 13" is detected as 8
❍3, #3: In NA, original size 8" x 10" is detected as 8
❍4, #4: In EU, original size 8" x 13" is detected as 8
1/2
1/2
1/2
" x 14"
" x 11"
" x 13"
Original Width Sensor Board
Original Width 1
Original Width 2
Original Side
Guide Position
B5SEF/
A5SEF
A4SEF/
A5LEF
B4/B5LEF A3/A4LEF
Peripherals
P4P3P2P1
B379D501.WMF
B379-5
PICK-UP AND SEPARATION 20 February, 2001
2.2 PICK-UP AND SEPARATION
[B]
[A]
[E]
B379D504.WMF
[C]
[D]
[B]
[F]
[G]
B379D505.WMF
The original is set with the image facing up. The original pushes actuator [A] and
the original set sensor [E] is activated.
After pressing the start button, the pick-up solenoid [D] is activated and the lift plate
[C] lifts the original up until it comes in contact with the pick-up roller [B]. The pickup roller then feeds the top sheet of paper.
After being fed from the pick-up roller, the topmost sheet is separated from the
stack by the separation roller and sent to the first transport roller.
The mechanism is an FRR system, consisting of the original feed belt [F] and
separation roller [G].
B379-6
20 February, 2001 ORIGINAL TRANSPORT AND EXIT
2.3 ORIGINAL TRANSPORT AND EXIT
2.3.1 SINGLE-SIDED ORIGINALS
[E]
[A]
[F]
[B]
[C]
[D]
B379D506.WMF
The DF feed motor feeds the separated original to the first transport roller [A] at
maximum speed. When the registration sensor [B] detects the leading edge, the
motor stops for a short while. Then the feed and transport motors turn on again,
and feed the original through the scanning area at a lower speed (the scanning
area contains the original exposure guide [D] and DF exposure glass [C]). After
scanning, the original is fed out by the second transport roller [E] and exit roller [F].
B379-7
Peripherals
ORIGINAL TRANSPORT AND EXIT 20 February, 2001
2.3.2 DOUBLE-SIDED ORIGINALS
[A]
[B]
[G]
B379D204.WMF
[C]
[F]
[A]
[H]
[E]
[D]
[E]
[D]
[F]
A858D205.WMF
When the re gistration senso r [B] detects the leading edge of t he original, the DF
feed motor (which drives the feed roller) and transport motor (which drives the
transport roller) both switch off. After a brief interval, the transport motor alone
reactivates to drive the first transport roller [A] and second transport roller [G] and
the exit roller [F]. The front side of the original is then scanned.
When the original exit sensor [C] detects the leading edge of the original, the
junction gate solenoid is activated and the junction gate [D] opens. The original is
then transported towards the reverse table [H].
Soon after the trailing edge of the original passes the exit sensor [C], the junction
gate solenoid switches off and the junction gate [D] is closed. When the original
has been fed onto the reverse table, the DF feed motor switches on in reverse. The
original is then fed by the reverse roller [E] and then by the exit roller [F] and first
transport roller [A] to the scanning area (where the reverse side will be scanned).
B379-8
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