Konica Minolta DF-313, DF-317 User Manual

SERVICE MANUAL
MODELS
DF-313/317
Document Feeder Units
(With Parts Catalogs)
JANUARY 2002
CSM - DF313/317

CONTENTS

CONTENTS
SAFETY AND IMPORTANT WARNING ITEM
Refer to the 7075/7085 service handbook on page......vii
1. OUTLINE
DF-313/DF-317 PRODUCT SPECIFICATIONS ...... 1-1
CENTER CROSS-SECTIONAL DRAWING ............ 1-2
DRIVE SYSTEM DIAGRAM .................................... 1-3
ORIGINAL CONVEYANCE PROCESS .................. 1-4
[1] Single side original copy mode (large) ........ 1-4
[2] Single side original copy mode (small) ....... 1-6
[3] Double side original copy mode (large) ...... 1-7
[4] Double side original copy mode (small) ...... 1-8
[5] Mixed original copy mode ........................... 1-9
2. UNIT EXPLANATION
EXTERNAL SECTION ............................................ 2-1
[1] Composition ................................................ 2-1
[2] Mechanisms ................................................ 2-1
ORIGINAL FEED/CONVEYANCE/EXIT
SECTION ................................................................ 2-3
[1] Composition ................................................ 2-3
[2] Mechanisms ................................................ 2-3
[3] Original Feed/Conveyance/Scan Control.... 2-5
[4] Original Reversal and Conveyance
Control ........................................................ 2-8
[5] Original Exit Control .................................. 2-10
[6] Original Size Detection Control ................. 2-12
2 UNIT EXPLANATION
3 DIS./ASSEMBLY
3. DISASSEMBLY/ASSEMBLY
EXTERNAL SECTION ............................................ 3-1
[1] Removing the RADF ................................... 3-1
[2] Reinstalling the RADF ................................. 3-2
ORIGINAL FEED/CONVEYANCE/EXIT
SECTION ................................................................ 3-5
[1] Removing/Cleaning/Reinstalling the Original
Feed Roller Unit .......................................... 3-5
[2] Cleaning the Cleaning Pad ......................... 3-5
[3] Replacing the Original Feed Roller/Separa-
tion Roller/Auxiliary Separation Roller ........ 3-6
[4] Cleaning the Paper Separation Rubber ...... 3-8
[5] Replacing the Double Feed Prevention
Roller/Torque Limiter .................................. 3-8
[6] Cleaning Photo Sensors/Mirrors for Photo
Sensors ....................................................... 3-9
CONTENTS
2 UNIT EXPLANATION
3 DIS./ASSEMBLY
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1
OUTLINE
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DF-313/DF-317 PRODUCT SPECIFICATIONS
DF-313/DF-317
[1] Type
Type:
Sheet-through type reversible DF
[2] Functions
Original size:
• Metric area A3, B4, A4, A4R, B5, B5R, A5, A5R, 11x17, 8.5x11, F4
• Inch area 11x17, 8.5x14, 8.5x11, 8.5x11R, 5.5x8.5,
5.5x8.5R, A3, B4, A4, B5, B5R
• All sizes are detected automatically.
• Mixing of original sizes possible.
Original type Plain original:
50 g/m2 or 14 lbs to 200 g/m2 or 45 lbs high quality paper.
Special original:
Original feed and conveyance ability may be infe­rior to those lbs
high quality original. Only SDF mode single-sided passage allowed for 131 g/m2 or 35 lbs to 200 g/m2 or 45 lbs thick original. The following types of original cannot be used:
• OHP film
• Blueprint masters
• Label original
• Offset masters
• Bonded original
50 g/m2 or 14 lbs to 130 g/m2 or 35
Original read speed (copies per minute, 7075: 400dpi/7085: 600dpi)
Mode Original Feed speed
Single-sided
original
Double-
sided original
size
A4/8.5x11 75 85
A4/8.5x11 50 58
DF-313 (7075) DF-317(7085)
Original feed layout:
Face-up placement, centered, U-turn feed/ straight eject (large size/small size independent eject), reversal section placed at ejection side.
Original image read position:
At the slit glass section
[3] Machine Data
Power source:
24V DC/5V (supplied from the main unit)
Max. power consumption:
Less than 180VA
Weight:
Approx. 21.5 kg
Machine dimensions:
570
unit:mm
Original
Curling
Original curling:
10 mm maximum
Maximum number of stacked originals:
100 sheet maximum (80g/m
2
or 22 lbs)
650
170
[4] Maintenance
Maintenance: Same as the main body Service life: Same as the main body
[5] Operating Environment
Temperature:
10°C to 30°C (50°F to 86°F)
Humidity:
10% to 80%RH
Note: The information herein may subject to change
for improvement without notice.
1 - 1
DF-313/DF-317

CENTER CROSS-SECTIONAL DRAWING

Double feed prevention roller
Registration roller
Separation roller
Original conveyance roller
Original feed roller
Original exit roller 1
Original feed tray
Original exit tray (for large­size original)
Original exit section (for small­size original)
Slit glass
Read position
Flapper
Reversal roller
Reversal conveyance roller 2
Reversal conveyance roller 1
Original exit gate
Original exit roller 2
Original exit reversal roller
1 - 2

DRIVE SYSTEM DIAGRAM

DF-313/DF-317
FRONT
Original feed roller
Registration roller
Original exit gate SD (SD303)
Flapper drive SD (SD 301)
Separation roller
Original conveyance roller
SDF switching SD (SD304)
Tray up/down drive motor (M303)
Original conveyance motor (M301)
Flapper
Original feed motor (M302)
Original exit roller 2
Original exit motor 2 (M305)
Original exit reversal roller
Pressure roller release SD (SD302)
FRONT
Original exit gate
Original exit roller 1
Reversal roller
Original exit motor 1 (M304)
1 - 3
Reversal conveyance roller
DF-313/DF-317

ORIGINAL CONVEYANCE PROCESS

The DF-313/DF-317 consists of a original feed section, conveyance section, reversal section, original exit reversal section, original exit tray (large), and original exit tray (small).
Original conveyance section
Original reversal section
Slit glass (Read section)
The original placed faced up on the original feed tray is fed from the topmost original. The fed original is not conveyed to the original glass. Instead, it is read when it passes the slit glass placed in the conveyance path.
Original feed section
Original registration detection PS (PS306)
Original exit tray
Original exit tray (small)
Original exit reversal section
Separation roller
Original feed roller
The DF-313/DF-317 operation consists of (a) single side original copy mode, (b) double side original copy mode, (c) mixed original copy mode and Z fold mode. Each has a different conveyance path. The convey­ance path also depends on the original size.
[1] Single side original copy mode
(large)
(single side to single side copy, single side to double side copy) The original set in the original feed tray is fed by the original feed roller and separation roller until PS306 (original registration detection) turns on.
Registration roller
1 - 4
DF-313/DF-317
When PS306 turns on, the registration roller pre­feeds the original and original is rapidly conveyed to the conveyance roller. The speed of the conveyance roller changes to scan speed at predefined interval after PS306 turns ON and feeds the original over the slit glass. At this point, if the next original is present, it is pre-fed as soon as PS306 detects its leading edge.
Original conveyance detection PS (PS308)
Registration roller
Slit glass
Slit glass
Original conveyance roller
Next original
Original exit roller 1
Flapper
The original is read when it passes over the slit glass. The original that has been read is conveyed along the circumference of the conveyance roller by the opening of the flapper, goes through original exit roller 1, and is exited to the original exit tray (large).
1 - 5
DF-313/DF-317
[2] Single side original copy mode (small)
(single side to single side copy, single side to double side copy) The original feed and conveyance actions up to scanning are performed in the same manner as for single side original copy mode (large). The original that has been scanned is fed to the original reversal unit by the reversal roller because the flapper is closed and the paper exit path is blocked. The original fed to the reversal unit passes through the original exit roller 2 and is exited to the original exit tray (small) since the original exit gate is closed.
Flapper
Reversal roller
Original reversal section
Original exit gate
Original exit roller 2
1 - 6
DF-313/DF-317
[3] Double side original copy mode (large)
(double side to single side copy, double side to double side copy) The original conveyance action up to the start of scanning of the front side of the first double side original is the same as for single side original copy mode (large). The original that has been scanned and read on the front side is fed by the reversal roller to the reversal unit since the flapper is closed and the original exit path is blocked. The original fed to the reversal unit does not fit in the reversal unit so the original exit gate opens to feed it to the original exit reversal section.
Flapper
Reversal roller
Original exit gate
When the original reversal detection PS (PS309) detects the trailing edge of the original and turns off, the reversal roller changes direction and feeds the original in the reversal section to the conveyance roller. Since the original is passed over the surface of the flapper, it is sent to the conveyance roller with sides reversed. The original reaching the conveyance roller does not exit the reversal roller so the pressure roller is released. The conveyance roller feeds this original over the slit glass for scanning.
Original reversal detection PS (PS309)
Reversal roller
Original exit reversal roller
The original that has completed scanning of the back side is fed inside the reversal unit once again since the flapper is closed. When PS309 detects the trailing edge of the original and turns off, the reversal roller changes direction and feeds the original in the reversal unit to the conveyance roller. Since the flapper is now opened, the original is fed along the flapper, passes through original exit roller 1, and is exited to the original exit tray (large).
Reversal roller
Flapper
Pressure roller
1 - 7
Flapper
Original exit roller 1
DF-313/DF-317
[4] Double side original copy mode (small)
(double side to single side copy, double side to double side copy) The original conveyance action up to the start of scanning of the back side is the same as double side original copy mode (large). The original that has been scanned and read on the back side is fed by the reversal roller to the reversal section since the flapper is closed and the original exit path is blocked. Then the original exit gate opens and the original is fed to the original exit reversal section.
Original exit reverse detection PS (PS313)
Reversal roller
Original exit gate
Original exit reversal roller
1 - 8
DF-313/DF-317
When PS313 (original exit reverse detection) detects the trailing edge of the original and turns off, the original exit reversal roller changes direction and feeds the original to the original exit gate. Since the original exit gate is closed, the original passes over the original exit gate and is exited from the original exit roller 2 to the original exit section (small) with sides reversed.
Original exit reverse detection PS (PS313)
Original exit roller 2
Original exit gate
Original exit reversal roller
[5] Mixed original copy mode
The mixed original copy mode supports both the same series originals and different series originals. However, since the size of the original in the conveyance direction is determined by the ON interval of PS306, size detection is performed prior to scanning.
The subsequent operations are the same as other copy modes.
For details on size detection, refer to section [6] Original Size Detection Control in section 2. UNIT EXPLA­NATION.
1 - 9
DF-313/DF-317
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1 - 10
2
UNIT EXPLANATION
2 UNIT EXPLANATION
2 UNIT EXPLANATION
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EXTERNAL SECTION

[1] Composition
Jam access cover
Original exit tray (for large-size original)
DF-313/DF-317
Original feed tray
2 UNIT EXPLANATION
Original exit section (for small-size original)
[2] Mechanisms
Mechanism
*1
Jam removal
Jam access cover Jammed original release knob Original conveyance guide open/ close lever Platen guide
*1 Jam removal
If an original jam occurs during original feed, open the Jam access cover and the original conveyance guide by releasing the original conveyance guide open/close lever, then turn the jammed original release knob to remove the jammed original.
Jammed original release knob
System
Jam access cover
Original conveyance guide open/close lever
If an original jam occurs during original reversal operation, open the platen guide to remove the jammed original .
Lock
Platen guide
Original conveyance guide open/close lever
Original conveyance guide
2 - 1
DF-313/DF-317
If an original jam occurs during original exit, open the original feed tray and original exit tray (for large-size original) to remove the jammed original.
2 UNIT EXPLANATION
Original feed tray
Original exit tray (for large-size original)
2 - 2
DF-313/DF-317
ORIGINAL FEED/CONVEYANCE/EXIT SECTION
[1] Composition
Original exit gate solenoid (SD303)
Original feed tray
Jam access cover
Flapper drive solenoid (SD301)
Pressure roller release solenoid (SD302)
Original exit motor 2 (M305)
Original exit motor 1 (M304)
[2] Mechanisms
Mechanism System Original feed Original feed roller Double feed Double feed prevention prevention roller
Separation roller
Original conveyance
*1 Original conveyance Flapper
path selection
*2 Original reverse and Reversal roller pressure
feed Reversal roller rotation
*3 Original exit Gate 1
path selection Gate 2
Original conveyance roller
Original conveyance motor (M301)
Original feed motor (M302)
SDF switching solenoid (SD304)
*1 Original conveyance path selection
In the two-sided copy mode, the original conveyance path selected after completion of scanning differs depending on whether the image on the front surface is to be printed or the image on the back surface is to be printed. A flapper is used to switch between these original conveyance paths. The flapper drive solenoid (SD301) is turned ON/OFF to switch between the reversal section and the original exit section.
2 UNIT EXPLANATION
FRONT
SD301 (Flapper drive SD)
Flapper
2 - 3
DF-313/DF-317
*2 Reversed original feed
In the double-side copy mode, the original fed to the reversal section is fed back by pressing the the pressure roller against the reversal roller. The pressure roller is driven by the pressure roller release solenoid (SD302).
Pressure roller release solenoid (SD302)
2 UNIT EXPLANATION
FRONT
Pressure roller
*3 Original exit path switching
Large-size one-side and two-side originals are exited to the original exit tray (for large-size original). On the other hand, small-size one-side and two-side originals are exited to the original exit section (for small-size original) through the reversal section. The small-size two-side original fed to the reversal section is reversed and exited to the small size original exit section. The original exit path switching to which the original is exited is performed by the gate 1 and gate 2, driven by the ON/OFF contol of the original exit gate solenoid (SD303).
Original exit gate solenoid (SD303)
FRONT
Original exit gate
2 - 4
[3] Original Feed/Conveyance/Scan Control
PS312 PS311 PS308 PS301 PS316 PS315 PS305 PS306
DF-313/DF-317
MS301
5VDC
PS312
PS312 LED CONT
5VDC
SGND
PGND
24VDC
MAIN BODY
PS311
PS311 LED CONT
DF VALID
DF CTS
DF DTR
5VDC
DF RXD
DF RTS
DF DSR
PS308
PS308 LED CONT
DF TXD
5VDC
PS301
24VDC
SD304 DRIVE
SD304
5VDC
SGND
PGND
FM301 LD
FM301 M302 M301 M303
Original feed is performed by the original feed roller and separation roller driven by M302 (original feed). Original conveyance is performed by the original conveyance roller driven by M301 (original conveyance). M301 and M302 are controlled by DFCB (RADF con­trol board).
1. Operation
a. Sensor activation at power ON
When SW1 (main) is ON, a sensitivity adjustment for PS306 (original registration detection), PS308 (original conveyance detection), PS311 (original skew detection 1) and PS312 (original skew de­tection 2) are performed. However, automatic adjustment is not performed when the RADF jam access cover is opened and MS301 (cover open/ close MS) is OFF or when there is original inside the RADF.
b. Pressing original against roller
(1) First original
When a control signal is received from the main body, M303 (tray up/down drive) turns forward to raise the original feed tray. By this moment,
5VDC
SGND
PS316
DFCB
FM301 DRIVE
5VDC
PS315
M302 DRIVE B
M302 DRIVE B
M302 DRIVE A
M302 DRIVE A
24VDC
SGND
24VDC
5VDC
PS305
24VDC
24VDC
SGND
M301 DRIVE A
M301 DRIVE A
M301 DRIVE B
M301 DRIVE B
the original is raised and pressed against the original feed roller. After PS315 (tray upper limit detection) turns ON, M303 stops after a predefined interval and leaves the original feed tray raised in standby state. After M302 feeds the first original, M303 rotates backward after a predefined time has elapsed since it stopped, lowering the original feed tray, and the pressure on the originals is released. M303 continues to rotate backward for a predefined interval and then stops and remains in standby state. At this point the original feed tray waits without lowering to the bottom.
(2) Second and subsequent originals
When PS308 (original conveyance detection) detects the leading edge of the first original and turns ON, M303 that was in standby turns forward to raise the original feed tray and presses the original against the original feed roller. Subsequent operations are the same as for the first original.
5VDC
PS306
PS306 LED CONT
M303 DRIVE B
M303 DRIVE B
M303 DRIVE A
M303 DRIVE A
MS301
24VDC
24VDC
24VDC
2 UNIT EXPLANATION
2 - 5
DF-313/DF-317
c. Original feed
M302 drives the original feed roller and separa­tion roller. When a control signal from the main body is re­ceived, M302 rotates forward at low speed, stops, and goes into standby. When the original feed tray is raised and PS315 turns ON, M302 turns backward after a predefined interval to start original feed operation. Then, when PS306 (original registration detection) detects the leading edge of the original and turns ON, M302 switches to high speed forward after a
2 UNIT EXPLANATION
predefined interval to complete the original feed operation. After completing original feed at high speed forward, M302 returns to low speed forward and stops and goes into standby when PS308 (original conveyance detection) turns ON.
d. Original conveyance operation
When feeding the first original, M302 transports the original to the conveyance roller by continuing to rotate at high and low speed. During this time, M301 (original conveyance) starts rotating forward at low speed at predefined time after PS306 turns ON. The original reached to the conveyance roller is then conveyed to the scan position. After starting conveyance of the first original, M301 continues to rotate forward at low speed until the last original is scanned.
e. Scan operation
The original is passed over the slit glass of the optics unit by the low speed forward rotation of M301 and read (scanned). While the original is being scanned, original feed and conveyance op­erations continue, triggered by the turning ON of PS308.
f. Original mis-centering detection control
PS311 (original skew detection 1) and PS312 (original skew detection 2) are provided to de­tect the inclined leading edge of the original dur­ing conveyance. PS311 and PS312 are placed at the front and back of the pre-scan conveyance path and de­termine the inclination of the original by measuring the difference in interval at which the leading edge of the original turns these switches ON. A skewed image caused by original inclination is corrected through image processing
so that the image on the original is copied to a copy paper as it is on the original.
g. SDF (Single Document Feeder) control
When SDF mode is selected, SD304 (SDF switching SD) cut the drive force to the double feed prevention roller to facilitate original feed­ing.
(1) ON timing
At the start of original feed
(2) OFF timing
When PS306 turns OFF
h. FM301 (ADF fan) operation
FM301 is used to cool M301 so that M301 does not overheat during operation.
(1) ON timing
At the start of original feed
(2) OFF timing
When original ejection completed.
i. Jammed original ejection control
Upon receiving a control signal from the main body, M301 rotates at high speed forward, attempting to eject a jammed original in the RADF.
2. Signals
a. Input signal
(1) MS301 (MS301 to DFCB)
Jam access cover open/close detection signal. [L] : Cover opened [H] : Cover closed
(2) PS301 (PS301 to DFCB)
RADF open/close detection signal. [L] : RADF closed [H] : RADF opened
(3) PS305 (PS305 to DFCB)
No original on original feed tray detection signal. [L] : Original present [H] : No original
(4) PS306 (PS306 to DFCB)
Original feed over original conveyance roller detection signal. [L] : Original present [H] : No original
(5) PS308 (PS308 to DFCB)
Pre-scan position original detection signal. [L] : Original present [H] : No original
2 - 6
DF-313/DF-317
(6) PS311 (PS311 to DFCB)
Front side original skew detection signal. [L] : Original present [H] : No original
(7) PS312 (PS312 to DFCB)
Rear side original skew detection signal. [L] : Original present [H] : No original
(8) PS315 (PS315 to DFCB)
Original feed tray upper limit detection signal. [L] : Tray at upper limit [H] : Tray not at upper limit
(9) PS316 (PS316 to DFCB)
Original feed tray lower limit detection signal. [L] : Tray at lower limit [H] : Tray not at lower limit
(10) FM301 LD (FM301 to DFCB)
Goes [L] when FM301 reaches predefined speed.
(11) DF TXD (MAIN BODY to DFCB)
Serial data for transmitting main body PRCB operating status to RADF.
(12) DF RTS (MAIN BODY to DFCB)
Send the Request To Send signal from main body PRCB to RADF.
(13) DF DSR (MAIN BODY to DFCB)
Send the Data Set Ready signal from main body PRCB to RADF.
b. Output signals
(1) PS306 LED CONT (DFCB to PS306)
Reflective sensor PS306 LED ON/OFF control signal. [L] : PS306 LED ON [H] : PS306 LED OFF
(2) PS308 LED CONT (DFCB to PS308)
Reflective sensor PS308 LED ON/OFF control signal. [L] : PS308 LED ON [H] : PS308 LED OFF
(3) PS311 LED CONT (DFCB to PS311)
Reflective sensor PS311 LED ON/OFF control signal. [L] : PS311 LED ON [H] : PS311 LED OFF
(4) PS312 LED CONT (DFCB to PS312)
Reflective sensor PS312 LED ON/OFF control signal. [L] : PS312 LED ON [H] : PS312 LED OFF
(5) M301 DRIVE A, A (DFCB to M301)
M301 A phase drive signal.
(6) M301 DRIVE B, B (DFCB to M301)
M301 B phase drive signal.
(7) M302 DRIVE A, A (DFCB to M302)
M302 A phase drive signal.
(8) M302 DRIVE B, B (DFCB to M302)
M302 B phase drive signal.
(9) M303 DRIVE A, A (DFCB to M303)
M303 A phase drive signal.
(10) M303 DRIVE B, B (DFCB to M303)
M303 B phase drive signal.
(11) FM301 DRIVE (DFCB to FM301)
FM301 ON/OFF drive signal. [L] : FM301 ON [H] : FM301 OFF
(12) DF TXD (DFCB to MAIN BODY)
Serial data for transmitting RADF operating sta­tus to main body PRCB.
(13) DF DTR (DFCB to MAIN BODY)
Send the Data Terminal Ready signal from RADF to main
(14) DF CTS (DFCB to MAIN BODY)
Send the Clear To Send signal from RADF to main body
(15) DF VALID (DFCB to MAIN BODY)
Image forming start signal.
body
PRCB.
PRCB.
2 UNIT EXPLANATION
2 - 7
DF-313/DF-317
[4] Original Reversal and Conveyance Control
PS308 PS309 PS304 PS306
5VDC
PS309
PS309 LED CONT
DF DTR
DF RXD
DF RTS
DF TXD
DF DSR
PS304 LED CONT
2 UNIT EXPLANATION
5VDC
SGND
24VDC
5VDC
PS308
PS308 LED CONT
DF VALID
DF CTS
PGND
MAIN BODY
In two side copy mode, an original that has been scanned on the front side is conveyed to the original reversal section to be reversed and then rescanned. At entrance to the original reversal section, there is a flapper to switch the original conveyance path. The flapper is driven by SD301 (flapper drive). The reversal roller, which reverses and conveys front-side-scanned original to the original reversal section and feeds that original to the scan section again, is driven by M304 (original exit 1). The original reversal roller which conveys original to the original reversal section is driven by M305 (original exit 2). When reversing and feeding large originals, the pressure roller is released by SD302 (pressure roller release). M304, M305, SD301, and SD302 are controlled by DFCB (RADF control board).
1. Operation
a. Sensor activation during power ON
When SW1 (main) is turned ON, a sensitivity adjustment for PS309 (original reversal detection) and PS313 (original exit reverse detection) are performed. However, automatic adjustment is not performed when the RADF jam access cover
5VDC
PS304
PS313
5VDC
PS306
PS306 LED CONT
24VDC
SD301 DRIVE
SD301 SD302 SD303
DFCB
5VDC
PS313
PS313 LED CONT
24VDC
SD302 DRIVE
24VDC
is opened and MS301 (cover open/close MS) is OFF or when there is original inside the RADF.
b. Original conveyance path switching/
reversal and original feed operation
(1) Small size original
SD301 is always OFF and the flapper is closed. Therefore, the scanned original, whether it is single side or double side, is conveyed to the reversal section by M304 rotating at low speed forward. When copying the back side of a double-side original, at predefined interval after PS309 (original reversal detection) detects the trailing edge of original and turns OFF, M304 rotates backward at low speed and then at high speed to reverse and feed the original. The reversed original is conveyed through the flapper and the guides to the conveyance roller.
(2) Large size original
The scanned-single side original is conveyed to the original exit tray (large) by the original conveyance roller since SD301 is ON and the flapper is opened.
M305 DRIVE A
M305 DRIVE A
M305 DRIVE B
M305 DRIVE B
SD303 DRIVE
M304M305
24VDC
24VDC
M304 DRIVE A
M304 DRIVE A
M304 DRIVE B
M304 DRIVE B
M302 DRIVE B
M302 DRIVE B
M302 DRIVE A
M302 DRIVE A
24VDC
24VDC
M302 M301
24VDC
24VDC
24VDC
24VDC
M301 DRIVE A
M301 DRIVE A
M301 DRIVE B
M301 DRIVE B
2 - 8
DF-313/DF-317
In the case of large double-side original, the origi­nal is conveyed to the reversal section when SD301 turns OFF after scanning the front side of a double-side original . The original reaching the reversal section does not fit in the reversal section so it is fed to the large-size original exit tray side by the large original reversal roller, which is driven by M305 (original exit 2). During this time, SD303 (original exit gate) turns ON and the original exit gate is closed. The original conveyed to the reversal section is reversed and fed to the scan section again in the same manner as small originals. Since the original reaching the conveyance roller does not exit the reversal roller, SD302 is turned ON at predefined interval after high speed backward rotation of M304 to release the pressure roller for the reversal roller. This enables original conveyance using the conveyance roller. SD302 turns OFF when it detects an image scan complete signal from the main unit.
c. Two side original next original feed
operation
(1) Small size original
During front-side scanning of two-side original, the original feed of the next one is started by the rotation of M302 (original feed) when PS306 (original registration detection) detects the trail­ing edge of the previous original and turns OFF. The next original stops and waits in standby at predefined interval after the turning ON of PS306 by its own leading edge. When the back side of the first original is scanned and PS308 (original conveyance detection) turns ON, M302 turns ON after a predefined interval to resume original feed to scan the front side of the next original. Thereafter, the same opera­tion is repeated.
(2) Large size original
During front-side scanning of double-side origi­nal, the original feed of the next original is started when PS306 (original registration detection) de­tects the trailing edge of the previous original and turns OFF. The next original stops and waits in standby at predefined interval after the turning ON of PS306 by its own leading edge. During ejection of previous original by reverse and exit operation, when PS309 (original reversal
detection) detects the trailing edge of the previ­ous original and turns OFF, M302 turns ON after a predefined interval to resume original feeding to scan the front side of the next original. There­after, the same operation is repeated. Note: See [5] Original Exit Control for informa-
tion on reverse and exit operation.
d. Jammed original ejction control
Upon receiving a control signal from the main unit, M304 and M305 rotate at high speed forward, attempting to eject a jammed original in the RADF.
2 UNIT EXPLANATION
2. Signals
a. Input signals
(1) PS304 (PS304 to DFCB)
Reversal section original detection signal. [L] : Original present [H] : No original
(2) PS309 (PS309 to DFCB)
Reversal section entrance original detection signal. [L] : Original present [H] : No original
(3) PS313 (PS313 to DFCB)
Original ejection reversal section original detec­tion signal. [L] : Original present [H] : No original
b. Output signals
(1) M304 DRIVE A, A (DFCB to M304)
M304 A phase drive signal.
(2) M304 DRIVE B, B (DFCB to M304)
M304 B phase drive signal.
(3) M305 DRIVE A, A (DFCB to M305)
M305 A phase drive signal.
(4) M305 DRIVE B, B (DFCB to M305)
M305 B phase drive signal.
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DF-313/DF-317
[5] Original Exit Control
PS307 PS309 PS304
5VDC
SGND
PS307
2 UNIT EXPLANATION
5VDC
SGND
PGND
24VDC
MAIN BODY
The ejection destination of the original that has been scanned depends on the size of original. The original exit roller 1 which conveys the original to the original exit tray (large) is driven by M304 (original exit 1). The original exit roller 2 which conveys the original to the original exit section (small) is driven by M305 (original exit
2). The flapper which switches the original exit path and the original exit gate are driven by SD301 (flapper drive) and SD303 (original exit gate) respectively. M304, M305, SD301, and SD303 are controlled by DFCB (RADF control board).
1. Operation
a. Small size original exit operation
(1) Single-side original
Scanned original is conveyed to the reversal sec­tion since SD301 is OFF and the flapper is closed. Original conveyed to the reversal section is conveyed to the original exit gate by the reversal roller which is driven by M304. During this time, M304 drives the conveyance roller with low speed forward rotation.
5VDC
PS309
PS309 LED CONT
DF VALID
DF CTS
DF DTR
DF RXD
DF RTS
DF DSR
5VDC
PS304
PS304 LED CONT
DF TXD
PS314 PS313
5VDC
SGND
DFCB
PS314
5VDC
PS313
PS313 LED CONT
24VDC
SD301 DRIVE
SD301 SD302 SD303
The original is conveyed to the original exit roller 2 since SD303 is OFF and the original exit gate is opened. M305 drives the original exit roller 2 with low speed forward rotation and ejects the original to the original exit section (small) with the original surface facing down.
(2) Two-side original
A original that has been scanned on the back side is conveyed to the original exit gate in the same manner as single-side original. During this time, SD303 is ON and the original exit gate is closed. Therefore, the original is passed through the original exit reversal roller, which is driven by the low speed forward rotation of M305, and conveyed to the original exit reversal section. M305 turns OFF when PS313 ( original exit re­verse detection) is turned OFF by the conveyed original. When SD303 turns OFF and the origi­nal exit gate opens, M305 starts high speed back­ward rotation after a predefined interval and re­verses the direction of the conveyed original. Since the original exit gate is opened, the origi­nal is conveyed to the original exit section (small) rather than returning to the reversal section.
24VDC
SD302 DRIVE
M305 M304
24VDC
24VDC
M305 DRIVE A
M305 DRIVE A
M305 DRIVE B
M305 DRIVE B
24VDC
SD303 DRIVE
M304 DRIVE B
24VDC
24VDC
M301
M304 DRIVE A
M304 DRIVE A
M304 DRIVE B
M301 DRIVE A
M301 DRIVE A
M301 DRIVE B
M301 DRIVE B
24VDC
24VDC
2 - 10
As a result, the two-side original is ejected with the front side facing down.
b. Large size original ejection operation
(1) Single-side original
The scanned original is conveyed to the original exit roller 1 by the conveyance roller since SD301 is ON and the flapper is opened. The original exit roller 1 is driven by the low speed forward rotation of M304 and the original is ejected to the original exit tray (large) with the copy surface facing down.
(2) Two-side original
The original that has been scanned on the back side is conveyed to the reversal section since SD301 is OFF and the flapper is closed. When PS309 (original reversal detection) detects the trailing edge of conveyed original, SD301 (flapper drive SD) is turned ON and the flapper is opened. Then, M304 (original exit 1) rotates backward and the original is ejected to the origi­nal exit tray (large size original) since the flapper is open.
DF-313/DF-317
2 UNIT EXPLANATION
2. Signals
a. Input signal
(1) PS307 (PS307 to DFCB)
Original exit tray (large) entrance original detection signal. [L] : Original present [H] : No original
(2) PS314 (PS314 to DFCB)
Original exit section (small) entrance original detection signal. [L] : Original present [H] : No original
2 - 11
DF-313/DF-317
[6] Original Size Detection Control
PS317 PS308 PS306
5VDC
SGND
PS317
2 UNIT EXPLANATION
5VDC
SGND
PGND
24VDC
MAIN BODY
The size of the original placed in the original feed tray is detected by PS302 (original size detection
1), PS303 (original size detection 2), and VR301 (original size detection). PS302, PS303, and VR301 are controlled by DFCB (RADF control board) through PTBD (tray drive board). DFCB contains a non-volatile memory for storing data such as timing data and original size detection threshold.
1. Operation
a. Normal copy mode
DFCB detects the original size from the combi­nation of the following signals:
(1) Drum axis direction size detection
A guide plate is connected to VR301 and the re­sistance vary with the position of the guide plate. This is used to determined the vertical dimen­sion of the original.
(2) Original feed direction size detection
The horizontal dimension of the original is de­tected with the ON/OFF combination of PS302 and PS303.
PS308 LED CONT
PS315
DF VALID
DF CTS
DF DTR
5VDC
PS308
DF RXD
DF RTS
DF TXD
DF DSR
5VDC
PS306
PS306 LED CONT
24VDC
24VDC
M301
PS302 PS303 VR301
5VDC
SGND
PS302
PTBD
5VDC
5VDC
SGND
PS303
PS302
PS303
SGND
VR301
5VDC
VR301
SGND
DFCB
M301 DRIVE A
M301 DRIVE A
M301 DRIVE B
M301 DRIVE B
b. Mixed copy mode original size detection
Size detection during mixed copy mode is per­formed as follows:
(1) Drum axis direction size detection
The vertical dimension of the largest original is determined by the position of the guide plate.
(2) The ON interval of PS306 (original registration
detection) after the original passes the registra­tion roller is used to determine the horizontal dimension of each original.
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