Ricoh df72 Service Manual
DOCUMENT FEEDER
(Machine Code: B387)
20 February, 2001 MECHANICAL COMPONENT LAYOUT
1. OVERALL INFORMATION
1.1 MECHANICAL COMPONENT LAYOUT
2
1
9
1. Separation roller
2. Original feed belt
3. Pick-up roller
4. Original entrance guide
5. Original table
3 4 5
678
B387V103.WMF
6. Original exit roller
7. 2nd transport roller
8. Original exposure guide
9. 1st transport roller
B387-1
Peripherals
ELECTRICAL COMPONENT LAYOUT 20 February, 2001
1.2 ELECTRICAL COMPONENT LAYOUT
1
2
14
13
12
11
3
4
5
6
10
9
1. DF feed clutch
2. Feed cover open sensor
3. DF pick-up solenoid
4. DF transport motor
5. DF drive board
6. DF position sensor
7. Original length sensor 2
7
8
B387V101.WMF
8. Original length sensor 1
9. Original trailing edge sensor
10. Original width sensor 1
11. Original width sensor 2
12. Original set sensor
13. Stamp solenoid
14. Registration sensor
B387-2
20 February, 2001 DRIVE LAYOUT
1.3 DRIVE LAYOUT
87
1
2
6
5
4
1. DF feed clutch
2. DF transport motor
3. 2nd transport roller
4. Exit roller
B387V102.WMF
5. Separation roller
6. 1st transport roller
7. Original feed belt
8. Pick-up roller
Peripherals
B387-3
ORIGINAL SIZE DETECTION 20 February, 2001
2. DETAILED SECTION DESCRIPTIONS
2.1 ORIGINAL SIZE DETECTION
[B]
[C]
[A]
[E]
The DF uses two width sensors (width sensor 1 [A] and width sensor 2 [B]) to
detect the original width, and two length sensors (length sensor 1 [C] and length
sensor 2 [D]) to detect the original length. The DF detects the original size based
on the combination of inputs from these sensors, as indicated in the table on the
next page.
If using a non-standard original size, the user must input the original length at the
operation panel.
The original width sensors have four possible output states: P1 to P4. The output
depends on the position of the ridges on the toothed plate attached to the original
rear fence.
During one-to-one copying, copy paper is fed to the registration roller in advance to
increase the copy speed. The original exit trailing edge se nsor [E] monitors the
stack of originals in the feeder, and detects when the trailing edge of the last page
has been fed in. This stops the ADF from causing the feed of an unwanted extra
sheet of copy paper.
[D]
B387V101.WMF
B387-4
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 ✗
✗❍
2
#
3 ✗
❍
#
4
4
❍✗
3
#
✗
❍✗
❍✗
Original
Length 1
Original
Length 2
P1 P2 P3 P4
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--
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 States -
Width Sensor 1 High Low Low High
Width Sensor 2 High High Low Low
Detection State P1 P2 P3 P4
Low = Blocked High = Open
Peripherals
B387-5
PICK-UP AND SEPARATION 20 February, 2001
2.2 PICK-UP AND SEPARATION
[D]
[E]
[F]
[C]
[A]
B387D102.WMF
[B]
[H]
[G]
[I]
B387D106.WMF
An FRR (feed and reverse roller) system is used.
Setting original(s) onto the feed table lifts the original set sensor feeler [A], causing
the original set sensor [B] to issue a signal informing the main CPU that the DF is
ready to start feeding.
When the Start key (!) is pressed, the DF pick-up solenoid [C] turns on, causing
the transport guide [D] and pick-up roller [E] to lo wer onto the original, while at the
same time causing the original stoppers [F] to drop down to clear the feed path for
the original. After 200 ms, the DF transport motor [G] turns on, feeding the top
original page to the paper feed belt [H], where it is separated by the separation
roller [I].
B387-6
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