Konica 7065 GUIDE MANUAL d312e

DF-312

SERVICE HANDBOOK

Jan. 2000

Ver. 2.0

KONICA CORPORATION

TECHNOLOGY SUPPORT CENTER

TOKYO JAPAN

CONTENTS

SAFETY AND IMPORTANT WARNING ITEMS.. .............

Refer to the 7065 service handbook on page C-1

1. DF-312

DF-312 PRODUCT SPECIFICATIONS...................... 1-1

[1] Type ............................................................... 1-1

[2] Functions ....................................................... 1-1

[3] Machine Data ................................................. 1-1

[4] Maintenance .................................................. 1-1

[5] Operating Environment .................................. 1-1

CENTER CROSS-SECTIONAL DRAWING............... 1-2

DRIVE SYSTEM DRAWING ...................................... 1-2

ORIGINAL CONVEYANCE PROCESS ..................... 1-3

[1] Single side original copy mode ...................... 1-3

[2] Double side original copy mode ..................... 1-4

[3] Mixed original copy mode .............................. 1-4

EXTERNAL SECTION ............................................... 1-5

[1] Composition ................................................... 1-5

[2] Mechanism..................................................... 1-5

[3] Disassembly and Re-assembly...................... 1-6

PAPER FEED/PAPER EXIT SECTION ..................... 1-9

[1] Composition ................................................... 1-9

[2] Mechanism..................................................... 1-9

[3] Disassembly and Re-assembly.................... 1-10

[4] Paper feed/conveyance/scan control........... 1-12

[5] Paper exit/reversal conveyance control ....... 1-14

[6] Original size detection control ...................... 1-16

CONTENTS

2. DIAGRAMS

DF-312 ELECTRICAL PARTS LAYOUT DRAWING . 2-1

DF-312 CONNECTOR LAYOUT DRAWING ............. 2-2

DF-312 OVERALL WIRING DIAGRAM...................... 2-3

DF CONTROL BOARD CIRCUIT DIAGRAM (1/2) .... 2-4

DF CONTROL BOARD CIRCUIT DIAGRAM (2/2) .... 2-5

DF-312 TIMING CHART (A4, ONE SIDE ORIGINALS,

FIVE SHEETS)........................................................... 2-6

DF-312 TIMING CHART (A4, DUAL-SIDED

ORIGINALS, TWO SHEETS) ..................................... 2-6

This section covers the structure, functions, operation and method of
disassembling and assembling the machine.
Observe the following precautions when performing disassembly and
assembly work.

1. Be sure to unplug the power cord before working on the machine.

2. Perform all reassembly work by reversing the order in which the
component was disassembled, unless otherwise specified.

3. Do not lose small parts (screws, etc.) or insert them in the wrong
place.

4. Install all parts completely before operating the machine.

5. Do not loosen the screws indicated as disallowed for removal.

1

DF-312

DF-312 PRODUCT SPECIFICATIONS

DF-312

[1] Type

Type: Sheet-through type reversible DF

[2] Functions

Originals size: A3, B4, A4, A4R, B5, B5R, B6R,

8.5 x 11

· All sizes are detected
automatically.

· Mixing of original sizes
possible.

Kinds of originals
Ordinary paper: 50 - 130 g/m

Special paper: Paper feed and conveyance abil-

ity may sometimes be inferior to
those of 50 to 130 g/m
ity paper.
The following kinds of paper can­not be used:

· OHP film

· Blueprint masters

· Label paper

· Offset masters

· Pasted originals

Original curling: Less than 10 mm Max.

2

fine quality paper

2

fine qual-

[3] Machine Data

Power source: 24 V DC / 5 V (supplied from the main

body)

Max. power consumption:

Less than 120 VA

Weight: Approx. 14.5 kg
Machine dimensions :

Unit: mm

570

590

150

Original

Curling

Maximum number of stacked originals:

50 sheets Max. (80g/m

Original read speed (copies per minute)

Mode

Single-sided

original to Single-

sided copy

Dual-sided original

to duplex copy

Original feed layout: Face-up setting, centered, U-turn

Original size

A4

A4

feed/straight paper exit, reversal
section mounted at paper exit
side.

2

)

Feed speed

65

38

[4] Maintenance

Maintenance: Same as the main body

[5] Operating Environment

Temperature: 10°C ~ 30°C
Humidity: 10% to 80%RH

Note: The contents of this manual may be changed without

prior notice.

Original image read position:

At the slit glass section

1 - 1

DF-312

CENTER CROSS-SECTIONAL DRAWING

Registration roller

Conveyance roller

Original
image read

Slit glass

position

Separation roller

Pressure pulley

Reversal roller

Paper exit roller

Paper feed roller

DRIVE SYSTEM DRAWING

Paper feed tray

Original conveyance
motor (M301)

Original feed CL
(CL302)

Original pick-up CL
(CL301)

Conveyance roller

Original feed motor
(M302)

Separation roller

Paper feed roller

Registration roller

Pressure pin

Paper exit roller

1 - 2

ORIGINAL CONVEYANCE PROCESS

DF-312

As the figure below shows, the DF-312 is composed of the
paper feed section, conveyance section, reversal section and
paper exit section.

Conveyance
section

Reversal section

Slit glass
(Read section)

The originals, which have been placed in the paper feed tray
with the front side facing up, are fed starting with the topmost
original. Originals that are fed are not conveyed to the original
glass. Reading is carried out as the original passes by the slit
glass section set midway through the conveyance path.

The operational modes of the DF-312 include three modes: (a)
single side original copy mode, (b) double side original copy
mode, (c) mixed original copy mode. The conveyance path is
different for each mode.

Paper feed section

Paper exit section

[1] Single side original copy mode

(single side to single side copy, single
side to double side copy)

The originals set in the paper feed tray are fed by means of the
paper feed roller and separation roller to the position where
PS306 (original registration) goes on.

When PS306 goes on, pre-feed is carried out by the registra­tion roller and the original is conveyed to the conveyance roller
at high speed. When PS308 (Original conveyance) detects the
leading edge of the original, the conveyance roller switches to
scanning speed and conveys the original to the slit glass.
If there is next original at this time, pre-feed is carried out.

Registration roller

PS308
(Original conveyance)

Reading of the original is carried out when the original passes
over the slit glass. Originals which have been read are
conveyed around the circumference of the conveyance roller
by closing of the flapper and are ejected to the paper exit
section via the paper exit roller.

Next original

Conveyance roller

PS306
(Original registration)

Registration roller

Separation roller

Paper feed roller

PS306 (Original registration)

1 - 3

Slit glass

Paper exit roller

Flapper

DF-312

[2] Double side original copy mode

(double side to single side copy, double side
to double side copy)

The original conveyance operation until the start of scanning
for the front side of the 1st double side original is the same as
that of the single side original copy mode.
When scanning starts and reading of the front side is com­pleted, the original is conveyed to the reversal section when the
flapper opens and the paper exit path is blocked.
When PS309 (original reversal) detects the leading edge of the
original that has been conveyed to the reversal section and
goes ON, pressure is applied to the pressure pulley. As a
result, the reversal roller and pressure pulley clasp the original
on both sides and convey it to the inside of the reversal section.

Flapper

Pressure pulley

When scanning of the back side starts, the flapper is opened.
As a result, the original which has been read is conveyed to the
inside of the reversal section again.

Flapper

When PS309 detects the trailing edge of the original and goes
OFF, the reversal roller rotates in the reverse direction to feed
the original from the reversal section to the conveyance roller.
Since the flapper is closed at this time, the original is conveyed
along the flapper and is ejected to the paper exit section via the
paper exit roller.

Slit glass

Reversal roller

PS309 (Original reversal)

When PS309 detects the trailing edge of the original and goes
OFF, the reversal roller rotates in the reverse direction to feed
the original from the reversal section to the conveyance roller.
Since the original passes over the top of the flapper at this time,
the front and back sides are reversed and the original is sent
to the conveyance roller.
The conveyance roller conveys the original to PS308 (Original
conveyance) at high speed.
When PS308 detects the leading edge of the original, the
conveyance roller switches back to scanning speed and con­veys the original to the slit glass for the original to be scanned.

Flapper

PS308 (Original
conveyance

PS309 (Original reversal)

Pressure pulley

Reversal roller

Next original

Flapper

PS309 (Original reversal)

Paper exit roller

Reversal roller

[3] Mixed original copy mode

The mixed original copy mode can handle both the same series
and different series of originals.
The size of the original in the conveyance direction is deter­mined by the ON time of PS306, size detection operation take
place prior to the scanning operation.
The original then stops at the scanning standby position. The
subsequent operations are the same for all copy modes.
For details on the size detection operation, refer to Paper Feed/
Paper Eject section “[6] Original Size Detection Control”.

1 - 4

EXTERNAL SECTION

[1] Composition

Open/close
cover

DF-312

Paper feed tray

Paper exit section

[2] Mechanism

Mechanisms

Jam clearance

∗ 1

Open/close cover
Release knob
Conveyance guide open/close lever
Pressure release lever
Platen guide

∗1: Jam clearance

If a paper jam occurs during the feed process, open the open/
close cover, raise the conveyance guide open/close lever, and
rotate the release knob to remove the jammed original.

Open/close cover

Release knob

Methods

Conveyance
guide open/close
lever

If the jammed original is hard to remove, operate the pressure
release lever to remove the pressure of the separation roller,
and then remove the original.

Separation roller

Pressure release lever

Conveyance guide

1 - 5

DF-312

If a paper jam occurs during the reversal process, the jammed
original can be removed by opening the platen guide.

Lock

Platen
guide

[3] Disassembly and Re-assembly

1. Removing and Re-installing the Paper Dust
Removing Pad

Caution: Be sure that the power cord has been un-

plugged from the power outlet.

a. Procedure

(1) Open the open/close cover.
(2) Remove the set screw, then remove the paper dust

removing pad.

2. Removing the RADF

Caution: Be sure that the power cord has been un-

plugged from the power outlet.

a. Procedure

(1) Remove the rear cover.
(2) Remove the set screw, then remove the connector cover.
(3) Remove the two connectors (CN100, CN102).
(4) Remove the two set screws, then withdraw the cable from

the main body.

Cable

Connector
(CN102)

Connector
(CN100)

Connector
cover

Set screws

Set screw

Paper dust removing pad

Set screw

(3) Re-install the paper dust removing pad in the opposite

sequence to removal.

(5) Remove the set screw from each, then remove the two

stoppers.

(6) Remove the two set screws from each, then remove the

two fixing plates.

Stopper

Set
screws

Set screw

Fixing
plate

1 - 6

DF-312

(7) Open the RADF.
(8) Remove the set screw from each while supporting the

RADF, then remove the two fixing plates.

(9) Remove the RADF from the main body.

Fixing plate/F

Set
screw

RADF

2. Re-installing the RADF

Caution: Be sure that the power cord has been un-

plugged from the power outlet.

a. Procedure

(1) Remove the two set screws, then remove the original

stopper plate of the main body.

Set screw

Original stopper plate

Set screw

(2) Install the two RADF positioning jigs in the hole of the

original stopper plate.

(3) After re-installing the RADF, secure the two fixing metal

plates temporarily with the set screws each.

Caution: The double-loop hole section of fixing metal plate

must be set in the guide screw.

Caution: Be sure to support the RADF during this process as

it may fall to the rear side when the fixing plate/F has
been removed.

Reference
hole
(round hole)

Reference
hole
(long hole)

Guide screw

Set screw

RADF
positioning jigs

Fixing metal plate

1 - 7

DF-312

(4) Close the RADF, and match the reference hole with the

RADF positioning jig.

(5) When the two positions are matched, secure each of the

two set screws of the fixing metal plate.

Set screws

Fixing metal plate

(7) Remove the two RADF positioning jigs, then install the

original stopper plate.

(8) Close the RADF, and check whether or not the stoppers

of the read section at the 2 locations contact with the slit
glass.

Stopper

Projection

Slit glass

Stopper

Projection

(9) Adjust the adjustment screws A and B alternately so that

both stoppers contact with the slit glass.

Caution: Repeat Step (8) to (9) until both stoppers make

contact with the slit glass simultaneously.

(10) Re-installing hereafter is performed in the opposite se-

quence to removal.

(6) Open the RADF and secure each of the set screw of the

fixing metal plate.

Adjustment
screw B

Adjustment
screw A

1 - 8

PAPER FEED/PAPER EXIT SECTION

[1] Composition

DF-312

Open/close cover

[2] Mechanism

Mechanisms
Paper feed
Double feed prevention

Conveyance
Conveyance path switching

∗1

Reversal paper feed

∗2

Flapper solenoid
(SD301)

Paper feed tray

Paper exit tray

Original pressure
solenoid (SD302)

Methods
Paper feed roller
Double feed prevention pad
Separation roller
Conveyance roller
Flapper
Reversal roller pressure
Reversal roller turn-back

Paper feed roller

Original feed motor
(M302)

Original feed CL
(CL302)

Separation roller

Original
pick-up CL
(CL301)

Registration
roller

Conveyance
roller

ADF fan
(FM301)

Original
conveyance motor
(M301)

∗1: Conveyance path switching

In the double side original copying, the conveyance path after
the end of reading operations differs for front side copies and
back side copies. Change of the conveyance path is carried
out by the flapper. Turning the flapper solenoid (SD301) ON
and OFF switches between the reversal section and the paper
exit section.

Conveyance roller

Flapper

Flapper solenoid
(SD301)

Flapper

1 - 9

DF-312

∗2: Reversal paper feed

During double side original copy operation, conveyance and
reversal paper feed are activated by bringing the pressure
pulleys into contact with the reversal roller. Pressure of the
pressure pulleys is driven by the original pressure solenoid
(SD302).

Pressure pulley

Reversal roller

Pressure pulleys

[3] Disassembly and Re-assembly

1. Removing and Re-installing the paper feed
roller/separation roller

Caution: Be sure that the power cord has been un-

plugged from the power outlet.

a. Procedure

(1) Remove the five set screws, and then remove the rear

cover.

Set screws

Set screws

Rear cover

Original pressure
solenoid (SD302)

(2) Open the open/close cover.
(3) Rotate the gear until the two pressure pins on the pickup

shaft point up.

Gear

Pressure
pins

Pick-up shaft

Caution: The pick-up shaft cannot be turned directly. Be sure

to rotate it via the gear.

1 - 10

DF-312

(4) Remove the two springs.
(5) Remove the stop ring and slide the bearing to the side.
(6) Slide the paper feed roller assembly towards the front

side, then remove it.

Bearing

Front

Stop ring

Springs

Paper feed
roller assembly

(7) Remove the bearing.
(8) Remove the two stop rings, then remove the guide lever.
(9) Remove the separation roller and paper feed roller.
Caution: When re-installing each roller, pay attention to cor-

rect roller orientation. (The correct orientation can
be determined by looking at the side shape of the
roller.)
Do not lose the spring of the paper feed roller.

2. Removing and Re-installing the double feed
prevention pad

Caution: Be sure that the power cord has been un-

plugged from the power outlet.

a. Procedure

(1) Remove the paper feed roller assembly.
(2) Push the pressure release lever so that pressure on the

double feed prevention pad is released.

Double feed
prevention pad

Pressure
release lever

(3) Push the double feed prevention pad down, slide it

towards the paper feed tray, and then remove it.

Separation roller

Paper
feed
drive
belt

Paper feed roller

Torque limitter

Stop rings

Springs

Bearing

Guide lever

Side shape of roller

(10) Re-install the paper feed roller and separation roller in the

opposite sequence to removal.

Double feed prevention pad

Paper feed tray

(4) Re-install the double feed prevention pad in the opposite

sequence to removal.

1 - 11

DF-312

[4] Paper feed/conveyance/scan control

PS310

60-3
60-2
60-1

12-7
12-8
12-9

PTDB

5VDC
SGND
PS310

VALID

5VDC

SGND

24VDC

PGND

RTS
DSR
RXD

CTS
DTR

TXD

11-1
11-5
11-6

CL301

36-4
36-1

CL302

37-4
37-1

106-7
106-3
106-5
106-4
106-6
106-2
106-1

2-9

2-7
28-5
28-2

9-1
9-5
9-6

44-1
44-2

44-3
44-4

1-1
1-2
1-3
1-4
1-5
1-6
1-7

2-1
2-2
2-3
2-4

5VDC
PS310
SGND

24VDC
CL301 DRIVE

24VDC
CL302 DRIVE

VALID
DSR
RTS
TXD
DTR
CTS
RXD

24VDC

24VDC
M301 DRIVE A
M301 DRIVE A
M301 DRIVE B
M301 DRIVE B

M302 DRIVE 1
M302 DRIVE 2

5VDC
PS304
SGND

5VDC
SGND
PS307

5VDC
PS306
SGND

SGND

PS308A
PS308B

5VDC

24VDC

FM301 DRIVE

PGND

3-3
3-4
3-5
3-6
3-7
3-8

3-9

3-10

7-3
7-2
7-1

6-8
6-9

6-10

7-7
7-8
7-9

6-7
6-6
6-5
6-4

44-5
44-6
44-7

M301

M302

PS304

42-1
42-2
42-3

PS307

49-1
49-2
49-3

PS306

44-3
44-2
44-1

PS308

51-4
51-3
51-2
51-1

FM301

MAIN BODY

DF CB

Paper feed takes place by transmitting the drive force of motor
M302 (original feed) to the paper feed roller and separation
roller. Conveyance takes place by transmitting the drive force
of motor M301 (original conveyance) to the conveyance roller.
M301 and M302 are controlled by the DF CB (RADF control
board).

1. Operation

a. Sensor adjustment when the power is ON.

When SW1 (main) is ON, PS306 (original registration) and
PS308 (original conveyance) are adjusted automatically. How­ever, if the RADF open/close cover is open or an original is
inside of the RADF, there will be no automatic adjustment.

b. Original pressure operation

When a control signal from the main body is received, CL301
(original pickup) goes ON, and after the specified time M302
starts to rotate in the forward direction. This causes the paper
feed roller to be lowered, applying pressure to the original.
After the specified time, M302 and CL301 go OFF and when
another specified time goes by, SD302 goes OFF, but the
pressure on the original is maintained until CL301 goes ON.

1 - 12

DF-312

c. Paper feed operation

When CL302 (original feed) goes ON, the driving force of
M302 is transmitted to the paper feed roller and the
separation roller.
CL302 goes ON at the same time as M302 performs forward
rotation. When M302 switches from forward to reverse rota­tion, paper feed starts.
When PS306 (original registration) goes ON, the reverse
rotation of M302 is switched to normal rotation after the
specified time.

d. Pre-feed of first sheet

Pre feed operation starts by the forward rotation of M302. This
causes the original to be moved to the conveyance roller.
M301 (original conveyance) has already turned ON after the
specified time from when CL301 went ON, and conveys the
original which reaches the conveyance roller to the read
position.
As a result, when PS308 (original conveyance) detects the
leading edge of the original and turns ON, normal rotation of
CL302 and M302 go OFF. After the specified time, starting
from this point, M301 slows down and starts scanning.

e. Pre-feed of second and further sheets

The original, which started pre-feed from the normal rotation of
M302, is conveyed to the conveyance roller as it is if the
previous original has been scanned.
If the original is under scan, M302 will rotate in the normal
direction again at the same time as when the scan is finished,
and feed the original to the conveyance roller after turning
M302 OFF and stopping it temporarily.
M301 will increase the rotation speed of the conveyance roller
at the time when the previous original has been scanned.
The normal rotation of CL302 and M302 will go OFF when
PS308 detects the leading edge of the original and goes ON.
Starting from this point, M301 will slow down after the specified
time and starts scanning.

f. Scanning operation (except final original)

After the specified time from when M301 starts to decrease its
speed, the original pass over the slit glass area of the main
body, where scanning is performed.
When PS306 detects the trailing edge of the original that
is being scanned and goes OFF, CL302 again goes ON
and the feed operation of the next original starts.
From the time when the original scan is finished, M301 in­creases the rotation speed of the conveyance roller.

g. Scanning operation (final original)

When PS301 (final original detection) goes OFF, M301 judges
that the original currently being scanned is the last one.
When PS307 (original exit detect) goes OFF, M301 also
goes OFF after the specified time.

h. Original pressure release operation

When M301 completes the scanning operation for the last
original and goes OFF, CL301 and M302 (reverse rotation) go
ON which causes the original pressure to be released. After the
specified time, CL301 and M302 go OFF.

i. FM301 (ADF fan) operation

M301 (original conveyance) is cooled by FM301 to prevent it
from rising up to a high temperature during operation.

• ON timing
When CL301 is ON during paper feed of the 1st original.

• OFF timing
After the specified time from when CL301 goes OFF during
paper feed of the final original.

2. Signals

a. Input signals

(1) PS304 (PS304 → DF CB)

M301 encoder surface slit detection signal
[L]: Slit is not detected
[H]: Slit is detected

(2) PS306 (PS306 → DF CB)

Original detection signal at the conveyance roller en­trance section
[L]: Original is detected
[H]: Original is not detected

(3) PS307 (PS307 → DF CB)

Original detection signal at the paper exit section
[L]: Original is detected
[H]: Original is not detected

(4) PS308 A, B (PS308 → DF CB)

Original detection signal at the pre-scanning standby
position
[L]: Original is detected
[H]: Original is not detected
PS310 (PS310 → PTDB → DF CB)

(5) Final original detection signal of the original tray

[L]: With original
[H]: Without original

(6) TXD (MAIN BODY → DF CB)

Serial data line for transmitting the main body control
board operation status to the RADF.

(7) RTS (MAIN BODY → DF CB)

Send request signal from the main body to the RADF.

(8) DTR (MAIN BODY → DF CB)

Send enable signal from the main body to the RADF.

1 - 13

DF-312

b. Output signals

(1) M301 DRIVE A, A, B, B (DF CB → M301)

M301 (original conveyance) ON/OFF drive signal

(2) M302 DRIVE 1, 2 (DF CB → M302)

M302 drive signal
M302 rotation direction is controlled by switching the
current direction of these two signals.

State
Forward rotation
Reverse rotation

Stop

M302 DRIVE 1

H
L
L

M302 DRIVE 2

H

(3) CL301 DRIVE (DF CB → CL301)

CL301 (original pick-up) ON/OFF drive signal
[L]: CL301 ON
[H]: CL301 OFF

(4) CL302 DRIVE (DF CB → CL302)

CL302 (original feed) ON/OFF drive signal
[L]: CL302 ON
[H]: CL302 OFF

(5) FM301 DRIVE (DF CB → FM301)

ON/OFF drive signal for FM301
[L]: FM301 ON
[H]: FM301 OFF

(6) TXD (DF CB → MAIN BODY)

Serial data line for transmitting the RADF operation status
to the main body control board.

(7) DTR (DF CB → MAIN BODY)

Send request signal from the RADF to the main body.

(8) RTS (DF CB → MAIN BODY)

Send enable signal from the RADF to the main body.

(9) VALID (DF CB → MAIN BODY)

Image forming start signal

[5]

Paper exit/reversal conveyance control

24VDC

24VDC
M301 DRIVE A
M301 DRIVE A
M301 DRIVE B
M301 DRIVE B

M302 DRIVE 1
M302 DRIVE 2

24VDC

1-1
1-2
1-3
1-4
1-5
1-6
1-7

2-1
2-2
2-3
2-4

DF CB

SD301 DRIVE

24VDC

SD302 DRIVE

5VDC

PS304

SGND

5VDC

SGND

PS307

5VDC

PS309

SGND

VALID
DSR
RTS
TXD
DTR
CTS
RXD

L

L

106-7

VALID

106-3

RTS

106-5

DSR

106-4

RXD

106-6

CTS

106-2

DTR

106-1

TXD

2-9

5VDC

2-7

SGND

28-5

24VDC

28-2

PGND

MAIN BODY

3-3
3-4
3-5
3-6
3-7
3-8

3-9

3-10

5-2
5-1

5-4
5-3

7-3
7-2
7-1

6-8
6-9

6-10

6-1
6-2
6-3

M301

M302

SD301

SD302

PS304

PS307

PS309

Paper path switching in the exit area is carried out by solenoid
SD301 (flapper) which operates a flapper (gate). In duplex
copy mode, the idler roller at the reversal paper feed is driven
by the SD302 (original pressure).
SD301 and SD302 are controlled by the DF CB (RADF control
board).

1. Operation

a. Sensor adjustment when the power is ON.

When SW1 (main) is ON, PS309 (original reversal) is adjusted
automatically. However, if the RADF open/close cover is open
or an original is in the inside of the RADF, there will be no
automatic adjustment.

1 - 14

DF-312

b. Paper exit operation

In single-sided copy mode and when copying the reverse side
of a sheet in duplex copy mode, SD301 goes OFF and the
flapper is closed. As a result, the original is conveyed to the
paper exit section after scanning.

c. Reversal paper exit operation

During copying the first side of a sheet in duplex copy mode,
PS308 (original conveyance) detects the leading edge of the
original, SD301 goes ON and the flapper opens. This causes
the original to be sent to the reversal section after scanning.
M302 (original feed) starts reverse rotation after the specified
time from when PS308 goes ON and the drive force is transmit­ted to the reversal roller.
When the front side scan is finished, M301 and M302 switches
to high-speed rotation.
At this time SD302 goes ON after the specified time after
scanning and applies pressure to the pressure pulley. As a
result, the original which has been conveyed to the reversal
section is caught between the reversal roller and pressure
pulley, and conveyed to the inside of the reversal section.

d. Reversal feed operation

When PS309 detects the trailing edge of the original and goes
OFF, both the M301 and M302 go OFF after the specified time,
and conveyance operation of the original is stopped.
After a predetermined OFF interval M302 starts forward rota­tion and feeds the original from the reversal section to the
conveyance roller side. At this time, PS309 again goes ON and
M302 goes OFF after the specified time. Furthermore, SD302
turns OFF after the specified time.

e. Pre-feed operation of next original when reading

back side of original

At the same time as when SD302 goes OFF, M301 and M302
start forward rotation after the specified time, and next original
pre-feed is carried out.

2. Signals

a. Input signals

(1) PS304 (PS304 → DF CB)

M301 encoder surface slit detection signal
[L]: Slit is not detected
[H]: Slit is detected

(2) PS307 (PS307 → DF CB)

Original detection signal at the paper exit section
[L]: Original is detected
[H]: Original is not detected

(3) PS309 (PS309 → DF CB)

Original detection signal at the reversal paper exit section
[L]: Original is detected
[H]: Original is not detected

(4) TXD (MAIN BODY → DF CB)

Serial data line for transmitting the main body control
board operation status to the RADF

(5) RTS (MAIN BODY → DF CB)

Send request signal from the main body to the RADF

(6) DTR (MAIN BODY → DF CB)

Send enable signal from the main body to the RADF

b. Output signals

(1) M301 DRIVE A, A, B, B (DF CB → M301)

M301 (original conveyance) ON/OFF drive signal

(2) M302 DRIVE 1, 2 (DF CB → M302)

M302 drive signal
M302 rotation direction is controlled by switching the
current direction of these two signals.

State
Forward rotation
Reverse rotation

Stop

(3) SD301 DRIVE (DF CB → SD301)

SD301 (flapper ) ON/OFF drive signal
[L]: SD301 ON
[H]: SD301 OFF

(4) SD302 DRIVE (DF CB → SD302)

SD302 (original pressure) ON/OFF drive signal
[L]: SD302 ON
[H]: SD302 OFF

(5) TXD (DF CB → MAIN BODY)

Serial data line for transmitting the RADF operation status
to the main body control board

(6) DTR (DF CB → MAIN BODY)

Send request signal from the RADF to the main body

(7) RTS (DF CB → MAIN BODY)

Send enable signal the RADF to the main body

(8) VALID (DF CB → MAIN BODY)

Image forming start signal

M302 DRIVE 1

H

L
L

M302 DRIVE 2

L

H

L

1 - 15

DF-312

[6] Original size detection control

PS302

11-3

9-3

12-1
12-2
12-3

12-4
12-5
12-6

13-1
13-2
13-3

VR301

11-4

9-4

11-6

9-6

SGND

106-7

VALID

106-3

RTS

106-5

DSR

106-4

RXD

106-6

CTS

106-2

DTR

106-1

TXD

5VDC

SGND

24VDC

PGND

MAIN BODY

2-9

2-7
28-5
28-2

PTBD

11-1

9-1

5VDC

1-1
1-2
1-3
1-4
1-5
1-6
1-7

2-1
2-2
2-3
2-4

DF CB

5VDC

SGND

PS302

5VDC

SGND

PS303

5VDC

VR301

SGND

PS303

11-2

9-2

VALID
DSR
RTS
TXD
DTR
CTS
RXD

PS302

40-3
40-2
40-1

PS303

41-3
41-2
41-1

VR301

1. Operation

a. Normal copy mode

The DF CB detects the original size from a combination of the
following signals.
(1) Detection of size in the direction of the drum shaft (width)

The guide plate is connected to the VR301 and the
resistance value differs according to the position of the
guide plate. Thus, it is possible to detect the width
measurements of the original.

(2) Detection of size in the direction of original feed

There is detection of the length measurements
of the original according to a combination of ON/OFF of
PS302 and PS303.

b. original size detection in the mixed original copy

mode.

Judgment of size in the mixed original copy mode is carried out
under the following conditions.
(1) Size detection in the direction of drum shaft (width).

There is judgment of the width measurements of the
largest original of the mixed originals by means of the
guide plate position.

(2) Size detection in the direction of the original feed.

There is judgment of the length measurements of the
originals according to the time when PS306 (original
registration) goes ON after feeding of the original from the
registration roller.

(3) Size detection operation in the direction of original feed.

When original pre-feed is started with the registration
roller, M301 (original conveyance) rotates forward and
the original is conveyed to the paper exit section. The
forward rotation of the M301 is continued until PS306
detects the trailing edge of the original and goes OFF. At
this time, depending on the ON time of PS306, there is
detection of the size of the original feed direction.

Registration roller

PS306
(Original registration)

The size of the original placed in the paper feed tray is detected
by PS302 (original size detect 1), PS303 (original size detect

2), and VR301 (original size detect).
PS302, PS303, and VR301 are controlled by the DF CB (RADF
control board) via the PTBD (Paper tray board).
Inside the DF CB is a non-volatile memory for recording the
timing data and original size detection threshold values.

1 - 16

PS308
(Original conveyance)

Conveyance roller

DF-312

M301 rotates in the reversal direction after the specified time
from PS306 goes OFF and returns the leading edge of the
original that has been conveyed to the paper exit section to the
scanning standby position. The trailing edge of the original
which has been returned is conveyed to the exit section due to
the configuration of the conveyance guide plate. The reversal
rotation of M301 stops after the specified time from PS308
(original conveyance) detects the leading edge of the original
and goes ON.

Scanning standby
position

PS308

(Original conveyance)

Conveyance roller

PS306
(Original registration)

Following this, there is the same reading as in the normal mode
(scanning operation).

2nd original

1st original

c. List of the possible mixing of sizes.

(

: Same size : Same series : Different series ✕ : Mixing
not possible – : Setting not possible.)
(1) AB series

1

Standard original (maximum original size that is detected with the guide plate).

A4 B4 B5 A5RA3 B5RA5A4R
A3
A4
B4
B5

A4R

A5

Other originals

B5R
A5R

✕
✕

–

–

–

–

–

–

–

–

–

–

–

–

✕
✕

✕

✕

✕

✕

(2) Inch series

Standard original (maximum original size that is detected with the guide plate).

8.5×11 8.5×1411×17 8.5×5.58.5×11R
–

11×17

8.5×11

8.5×14

8.5×11R

8.5×5.5

Other originals

8.5×5.5R

✕

–

–

–

✕

✕✕

2. Signals

a. Input signals

(1) PS302 (PS302 → PTBD → DF CB)

Original length detection signal
[L]: Original is detected
[H]: Original is not detected

(2) PS303 (PS303 → PTBD → DF CB)

Original length detection signal
[L]: Original is detected
[H]: Original is not detected

(3) VR301 (VR301 → PTBD → DF CB)

Original width detection signal

(4) TXD (MAIN BODY → DF CB)

Serial data line for transmitting the main body control
board operation status to the RADF

(5) RTS (MAIN BODY → DF CB)

Send request signal from the main body to the RADF.

(6) DTR (MAIN BODY → DF CB)

Send enable signal from the main body to the RADF.

–
–

✕

–
–
–
–
–
–

✕

8.5×5.5R

–
–
–
–
–
–
–

–
–
–
–
–

The original size detection operation with the 2nd original and
subsequent originals has a different start timing for the single
side mode and double side mode.
Single side mode: At time of starting scanning operation of
former original.
Double side mode: At time of starting scanning operation of
former original back side.

MODEL

DF-312

SERVICE HANDBOOK

MANUAL

REVISED EDITION

b. Output signals

(1) TXD (DF CB → MAIN BODY)

Serial data line for transmitting the RADF operation status
to the main body control board.

(2) DTR (DF CB → MAIN BODY)

Send request signal from the RADF to the main body.

(3) RTS (DF CB → MAIN BODY)

Send enable signal from the RADF to the main body.

1 - 17

1

DATE

Jan.2000

PAGE

1-17

METHOD

REPLACEMENT

2

DIAGRAMS

DF-312 ELECTRICAL PARTS LAYOUT DRAWING

8

7

6

11

9

21

DF-312

2

16

17

10

12

1. Switches and Sensors

1 MS301 Cover open/close MS
2 PS301 RADF open/close PS
3 PS302 Original size detection sensor 1
4 PS303 Original size detection sensor 2
5 PS304 Encorder sensor
6 PS305 No original detection sensor
7 PS306 Original registration sensor
8 PS307 Original exit sensor

9 PS308 Original feed sensor
10 PS309 Original reversal sensor
11 PS310 Final original detection sensor
12 VR301 Original size detection VR

15

5

3

4

20

1

19

18

14

13

2. Loads

13 FM301 ADF Fan
14 M301 Original conveyance motor
15 M302 Original feed motor
16 SD301 Flapper solenoid
17 SD302 Original pressure solenoid
18 CL301 Original pick-up clutch
19 CL302 Original feed clutch

3. PCBs and Others

20 DFCB RADF control board
21 PTBD Paper tray board

2 - 1

DF-312

DF-312 CONNECTOR LAYOUT DRAWING

49(W:3 PIN)

11(W:6 PIN)

31(W:4 PIN)

51(W:4 PIN)

49/50(W:4 PIN)

15(W:3 PIN)

42(W:3 PIN)

52/53(W:3 PIN)

55/56(W:2 PIN)

44(W:3 PIN)

46/47(W:3 PIN)

43(W:3 PIN)

57/59(W:2 PIN)

54(W:4 PIN)

13(W:3 PIN)

60(W:3 PIN)

12(W:9 PIN)

40(W:3 PIN)

41(W:3 PIN)

30(W:7 PIN)

34/35(W:2 PIN)

37(W:4 PIN)

33(W:6 PIN)

36(W:4 PIN)

2(W:4 PIN)

1(W:7 PIN)

2 - 2

38/39(W:3 PIN)

3(W:10 PIN)

4(W:7 PIN)

DFCB

5(W:5 PIN)

6(W:10 PIN)

7(W:9 PIN)

9(W:6 PIN)

8(W:3 PIN)

DF-312 OVERALL WIRING DIAGRAM

ORIGINAL

SIZE DETECT

SENSOR 1

PS302

40-3

40-2

40-1

B

B

B

12-2

12-1

12-3

H

5VDC

SGND

PS302

ORIGINAL

SIZE DETECT

SENSOR 2

PS303

41-3

41-2

41-1

BBB

12-5

12-4

12-6

H

5VDC

SGND

PS303

PTBD

11-1

11-4

11-2

11-3

11-5

R

Y

P

W

LB

9-5

9-3

9-2

9-4

H

H

H

VR1

5VDC 9-1

PS303

PS302

PS310

DETECT SENSOR

11-6

BK

9-6

*

SGND

ORIGINAL

LAST PAPER

PS310

60-3

60-2

60-1

BBB

12-8

12-7

12-9

H

5VDC

SGND

PS310

ORIGINAL

SIZE DETECT

VR

VR301

BBB

13-2

13-1

13-3

*

VR1

5VDC

SGND

MOTOR
CLOCK
DETECT

SENSOR

PS304

42-3

42-2

BBB

7-2

7-1

*

SGND

PS304

42-1

7-3

5VDC

NO ORIGINAL

DETECT

SENSOR

PS305

43-3

43-2

43-1

BBB

7-5

7-4

7-6

H

5VDC

SGND

PS305

ORIGINAL

REGIST

SENSOR

PS306

44-3

44-2

44-1

BBB

7-8

7-7

7-9

L

P306

5VDC

SGND

ORIGINAL

EXIT DETECT

SENSOR

PS307

49-3

49-2

49-1

BBB

47-2

47-1

47-3

46-2

46-3

46-1

BBB

6-9

6-8

6-10

H

5VDC

SGND

PS307

ORIGINAL

FEED DETECT

SENSOR

PS308

51-1

51-4

51-3

51-2

BBB

B

50-2

50-1

50-3

50-4

49-2

49-1

49-3

49-4

BBB

B

6-4

6-6

6-7

6-5

L

H

5VDC

SGND

PS308 B

PS308 A

ORIGINAL
REVERSE

DETECT
SENSOR

PS309

54-3

54-2

BBB

53-3

53-2

53-4

52-2

52-1

52-3

BBB

6-2

6-3

L

SGND

PS309

54-1

6-1

5VDC

FLAPPER

SOLENOID

SD301

RRR

56-2

56-1

55-2

55-1

B

B

H

24VDC 5-2

SD301 DRIVE 5-1

ORIGINAL

PRESS

SOLENOID

SD302

R

58-2

58-1

57-2

57-1

B

B

5-4

5-3

H

24VDC

SD302 DRIVE

30-7

VALID

P

1-1

P

30-6

106-7

RTS

DSR

PPP

1-3

1-2

LB

BK

30-5

106-5

106-3

30-4

TXD

1-4

BN

30-3

106-4

DTR

PPP

1-5

W

30-2

106-6

CTS

1-6

Y

30-1

106-2

RXD

1-7

V

106-1

31-1

5VDC

2-1

R

31-2

2-9

SGND

2-2

B

2-7

24VDC

2-3

O

31-3

28-5

PGND

2-4

GY

31-4

28-2

MAIN BODY

31-5

B

FGND

SGND

5VDC

PS301

8-3

8-2

8-1

LB

LB

LB

15-1

15-2

15-3

PS301

DDF

OPEN/CLOSE

DETECT

PS

24VDC

MS301

3-2

3-1

B

O

32-2

32-1

MS301

COVER

OPEN/CLOSE

DETECT

MS

DFCB

24VDC

24VDC

3-4

3-3

W

BK

33-9

33-3

W

BK

M301

ORIGINAL

CONVEYANCE

MOTOR

M301 DRIVE A

M301 DRIVE B

M301 DRIVE A’

*

3-7

3-6

3-5

P

O

BN

33-7

33-5

33-1

P

O

BN

M301 DRIVE B’

***

3-8

Y

33-1

Y

M302 F

L

3-9

R

34-1

35-1

R

M302

ORIGINAL

FEED

MOTOR

M302 R

L

3-10

B

34-2

35-2

B

24VDC

CL301
H

4-2

4-1

B

B

36-1

36-4

CL301

ORIGINAL

PICK-UP
CLUTCH

24VDC

CL302
H

4-4

4-3

B

B

37-1

37-4

CL302

ORIGINAL

FEED

CLUTCH

24VDC

44-5

B

38-1

39-3

R

FM301 DRIVE

H

44-6

B

38-2

39-2

W

FM301

ADF
FAN

PGND

44-7

B

38-3

39-1

BK

2 - 3

DF CONTROL BOARD CIRCUIT DIAGRAM (1/2)

2 - 4

DF CONTROL BOARD CIRCUIT DIAGRAM (2/2)

2 - 5

DF-312 TIMING CHART (A4, ONE SIDE ORIGINALS, FIVE SHEETS)

0 10987654321

25

200

100

104 104

50

30

(sec)

10

25

567

10

25

104

567

10

25

104

567

10

25

104

567

567

34

300

25

DF-312 TIMING CHART (A4, DUAL-SIDED ORIGINALS, TWO SHEETS)

0 10987654321

10

25

200
100

104

30

50

30

567

70

30

100

25

567

70

25

30

567

(sec)

10

100

70

25

30

567

70

34

300

25

2 - 6