SHARP SF-A56 Service Manual

SERVICE MANUAL

CODE: 00ZSFA56SM//E

MODEL SF-A56

MODEL SF-A17

CONTENTS

[ 1 ] PRODUCT OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

[ 2 ] SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

[ 3 ] UNPACKING AND INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

[ 4 ] STRUCTURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

[ 5 ] OPERATIONAL DESCRIPTIONS (MECHANISM SECTION) . . . . . . . . . . . 7

[ 6 ] DISASSEMBLY, ASSEMBLY AND ADJUSTMENT . . . . . . . . . . . . . . . . . 15

[ 7 ] CONNECTOR LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

[ 8 ] REPLACEMENT PARTS AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . 21

[ 9 ] ELECTRICAL SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

[10] CIRCUIT DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

■ PARTS GUIDE

Parts marked with "! " is important for maintaining the safety of the set. Be sure to replace these parts with specified
ones for maintaining the safety and performance of the set.

This document has been published to be used

SHARP CORPORATION

for after sales service only.
The contents are subject to change without notice.

[1] PRODUCT OVERVIEW

The SF-A56/A17 is a reversing automatic document feeder (RADF)/
automatic document feeder (ADF) for the copier SF-2025/2030. The
SF-A56 is capable of automatically copying both sides of document
by inverting the document sheets up-side down, while feeding them.

Even document sheets of different lengths and the same width may
be set in the document tray, an internal sensor in the ADF senses the
document size when the document is fed. The copier automatically
selects the proper copy paper corresponding to the document size
along with the appropriate magnification ratio.

If the appropriate copy paper, respective to the document size and
the magnification ratio, is not available, the copier stops copying and
indicates the required paper size on the display.

[2] SPECIFICATIONS

• Document setting direction: Face-up

• Document setting position: Center alignment

• Document transfer system: Belt drive

• Document feed sequence: Bottom take-up feeding

(Face-up discharge)

• Document size: A3 ∼ A5 (Portrait), 11" × 17" ∼

8-1/2" × 5-1/2"

• Document changing time: 0.68sec or less

(Excluding the first copy)

• Document weight: Thin paper mode; 35 ∼ 50g/m

Standard mode; 51 ∼ 128g/m

• Max. No. of documents to be set:

50 sheets (A4, letter)

35 ∼ 80g/m2 (9 ∼ 21lb), 5mm thick
or less
80 ∼ 128g/m2 (21 ∼ 33lb),
5mm thick or less

• Document stopper: Mechanical stopper

• Dimensions: SF-A56;

592 (W) × 521 (D) × 110 (H)mm
23-5/16" (W) × 20-33/64" (D) ×
4-11/32" (H)

SF-A17;

571 (W) × 521 (D) × 110 (H)mm
22-31/64" (W) × 20-33/64" (D) ×
4-11/32" (H)

• Weight: SF-A56; 11kg (24.3lbs)

SF-A17; 10kg (22.1lbs)

[Features]

• Document detection on tray (Irregular-sized documents are copied

without size recognition.)

• Recognized paper sizes: Japan;

A3, B4, A4, A4R, B5, B5R,

Inch series;

11" × 17", 8-1/2" × 14", 8-1/2" ×
11", 8-1/2" × 11"R, 8-1/2" × 5-1/2"

Non-Japanese A/B series:

A3, B4, A4, A4R, A5

• Mixed document: Possible

• Document inversion: Automatic

[Display]

• Document feed indicator: Lights when documents are set on

feed tray and indicates that RADF is
ready.

2

2

• Remove original indicator: When originals are placed manually,

the LED lights at the same time as
exposure of the last document sheet
is finished. The LED goes out when
the document feed cover is opened.

[3] UNPACKING AND

INSTALLATION

1. UNP ACKING

2. INSTALLATION

SF-A56

SF-A17

– 1 –

Included parts

2. Mount the ADF onto the copier.

Remove the two cut-outs from the rear part of the upper cover of the
copier.

Cut-outs

Rear part of
upper cover

ADF tray

ADF mounting screws

(2 pcs.)

Right cover

(1 pc.)

ADF securing screws

(2 pcs.)

Tray securing screws

(2 pcs.)

Left cover

(1 pc.)

Unplug the copier and follow the procedure below.

1. Remove the document cover.

Open the document cover and lift it at a slight backward angle to
remove it.

Insert the left and right covers (included parts) into the holes from
which the document cover has been removed.

Document cover

Right cover

Install the two ADF mounting screws.

ADF mounting screws

Fit the ADF mounting screws into the holes in the hinges of the ADF
and secure the ADF with the two ADF securing screws.

ADF securing screws

Left cover

ADF mounting screw

ADF securing screw

– 2 –

3. Adjust the angle of ADF.

Loosen the two securing screws for the angle adjusting panel at­tached to the hinge angle and then fasten the loosened screws while
raising the angle adjusting panel completely.

5. Connect the ADF tray connector.

Thread the M4 x 8 tray securing screws (includedparts) partway into
their holes, then connect thetray connector.

Tray connector

Tray
securing
screws

Connector on the ADF

Angle adjusting panel
securing screws

Long hole

Long hole

Hinge

Angle adjusting panel

NOTE:
Be sure to check that the protrusion of the angleadjusting panel
is securely inserted into the long hole of the hinge.

4. Connect the ADF connector.

Remove the connector cover from the copier’s rear cover.
Next, connect the ADF connector to the connector on the copier.

6. Attach the ADF tray.

Loosen the two ADF tray securing screws, install the tray as shown in
the figure, and fasten the tray securing screws.

Tray
securing
screws

Tray

Plug the copier into a grounded outlet and turn the
power switch on. Then, follow the procedure below.

7. Set the mode.

• Operate the copier keys to set the mode.

ADF connector

Connector on the copier

Connector cover

C

5 0

The above key operation will display the currently set mode.

//

//

• When only the SF-A56 is to be set, immediately after the above

key operation, operate the keys as follows:

//

– 3 –

0

1

• If the mode is to be set in combination with other options, use the

table shown below to add up the total of the setting values for all
the peripheral devices to be set, and set that total value.

For example, if the SF-A56 and sorter are to be set, the total
setting value is 1 + 10 = 11. Operate the keys as follows:

The leading edge position can be adjusted within a range of 8 mm
(8 steps) on the stopper side and 7 mm (7 steps) on the glass side
in 1 mm increments. Adjustment can be done separately for the
one-sided, two-sided, and thin paper modes.

8

/

0

2

4

3

5

69

00

0/

01 02

03

041

0

0

SF-A17 1 Stand/paper drawer 4 Sorter 10
SF-A56 1 Staple sorter 10

8. Adjust the center of the copy.

Set an original in the ADF tray and make a copy.
When the copy is off center as shown in Fig. 1 or Fig. 2, loosen the

two tray securing screws and adjust the tray by moving it in direction
A orB as shown in the figure.

Mark

Tray securing screw

BA

8

mm

Stopper

6

mm

Glass

View from the operator side

Setup example

(1) If the leading edge of the original was not fed all the way to the

stoppe r, enter value which will mov e the original towa rd the
stopper side.
7, 6, 5, 4...

Original

Stopper

Glass

(2) If the copy image at the leading edge was distorted, enter value

which will move the original toward the glass side.
9, 10, 11...

Original

★ When off center as shown in fig. 1

Move the tray in direction A and secure it with the two mounting
screws. Make a copy to check whether it is centered properly.

Fig. 1

Center of copy paper

Center of original image (first copy)

★ When off center as shown in fig. 2

Move the tray in direction B and secure it with the two mounting
screws. Make a copy to check whether it is centered properly.

Fig. 2

Center of copy paper

Center of original image (first copy)

Stopper

Glass

(3) If the original overrode the stopper, enter value which will move

the original toward the glass side.
9, 10, 11, 12 ...

Original

Stopper

Glass

• After selecting test command 53 , enter a selected set value

between 0 and 15 using the copier keys.

C

0/

0/

(a) One-sided mode
(b) Two-sided mode
(c) One-sided thin paper mode

*For SF-A17, only (a) and (c) are possible.

4

(a)

0

(b)

1

(c)

2

2

9. Adjust the position of the leading edge of originals

• The position of the leading edge of originals fed from the ADF can

be determined using test command 53 .

• Although the leading edge has been factory set to stop at location

(8), it may need to be adjusted depending on the type of originals.

Set to between 0 and 15 as dictated by the copier's performance.
The factory setting is "8".

– 4 –

[4] STRUCTURE

A. External fitting

Original guide

Original feed cover

Display lamp

B. Mechanism

Original stopper

Separation
roller

A21 weight plate

Semi-circular roller

Original support

Original transport
cover

Original exit section
cover

Paper exit roller

Flapper

C. PWB distribution

Control PWB

Original reverse
sensor PWB

Original timing
sensor PWB

Separation
roller

Weight plate

Semi-circular roller

Reverse sensor
PWB (SF-A56 only)

LED PWB

Paper feed roller

Paper exit
unit

Resist
roller

Transport belt
drive roller

Paper feed roller

Original transport belt

transport belt
follower roller

SF-A56

Reverse
roller

Resist
roller

Transport belt

Paper exit roller

Original transport belt

Transport belt follower roller

SF-A17

D. Motors, solenoids, and clutches

■ Motors

Code Name Type Functions and operations Contact/output

DFM Paper feed motor DC motor Drives the pickup roller, the separation roller,

DTM Transport motor Stepping motor Drives the transport belt roller.
DRM Reverse motor Stepping motor Drives the reverse roller and the paper exit roller.
DFSOL Paper feed solenoid DC solenoid Presses the paper feed section weight plate onto

DRSOL Reverse solenoid DC solenoid Drives the reverse flapper to select the paper

DTM

and the resist roller.

the original and opens/closes the shutter.

exit path or the reverse feed path.

DRM (SF-A56 only)

When this is ON, the weight
plate and the shutter fall.

When this is ON, the reverse
path is selected.

DFM (SF-A56 only)

DRSOL (SF-A56 only)

DFSOL (SF-A56 only)

– 5 –

E. Sensor s, swit ch es, det ect or s

DFMRS

FGOD

DWS

AUOD

DSS

DFD

DLS1

DED

DTD

TGOD (SF-A56 only)

RDD (SF-A56)

DES (SF-A17)

DWVR

Code Name Type Functions and operations Contact/output

DFD Original feed sensor Reflection sensor Turns HIGH when the original lead edge

is fed just in front of the resist roller.

DTD Original timing sensor Reflection sensor Turns HIGH when the original lead edge

is transported from the paper feed section

HIGH when the original is
sensed.

HIGH when the original is
sensed.

to the vicinity of the transport belt.

RDD Reverse sensor Reflection sensor Turns HIGH when the original lead edge

is transported to the reverse/paper exit

HIGH when the original is
sensed.

path.

DED Original end sensor Photo interrupter Final paper detection on the tray LOW when the original is

sensed.
DWVR Original width volume Slide volume Original width detection on the tray
DLS1 Original length sensor 1 Photo interrupter Original length detection on the tray HIGH when the original is

sensed.
DLS2 Original length sensor 2 Photo interrupter Original length detection on the tray (Inch

series only)

HIGH when the original is

sensed.
DSS Original set sensor Photo interrupter Original detection on the tray HIGH when the original is

sensed.
DFMRS Paper feed motor rotation sensor Photo interrupter Paper feed motor rotation detection Pulse output
DWS Original width sensor Photo interrupter Original width detection LOW when the original is

sensed.
AUOD ADF open/close sensor Microswitch ADF unit open/close detection LOW when closed.
FGOD Paper feed guide switch Microswitch Paper feed cover open/close detection LOW when closed.
TGOD Reverse guide switch Microswitch Reverse cover open/close detection LOW when closed.
DES Paper exit sensor Photo interrupter Turns HIGH when the original lead edge

is transported to the paper exit path

HIGH when the original is

sensed.

– 6 –

[5] OPERATIONAL DESCRIPTIONS

(MECHANISM SECTION)

A. Operation flowchart

The figures below show the transport path of an original from the
original setting, through paper feed, copying, to paper exit. For details
of operations, refer to the operation process.

Original stopper

Separation
roller

Resist
roller

Separation
roller

Resist
roller

1) SF-A17 ADF mode (single copy mode) copying

Step 01: The transport section is closed. (AUOD OFF)

Step 02: An original is set on the original tray. (DSD

Step 03: Original feed display ON

Step 04: Print SW ON

(Preliminary
paper feed):

Step 05: Paper feed motor (DFM) forward rotation

Step 06: Transport motor (DTM) forward rotation

A21 weight plate

Semi-circular roller

Transport belt
drive roller

Paper feed roller

Weight plate

Semi-circular roller

Transport belt

Paper exit roller

START

↓

↓



↓

↓

↓

↓







↓








Paper exit roller

Flapper

Original transport belt

transport belt

SF-A56

Original transport belt

SF-A17

output HIGH)

For the first original, dummy paper exit is
performed.

(Paper feed roller, semi-circular roller
rotation)
Since the stopper is up, paper feed is not
performed.

(Transport belt, paper exit roller rotation)
* A: If there have been some originals on

the tray, they are discharged.

follower roller

Paper feed roller

Transport belt follower roller

Reverse
roller

Paper exit
unit

↓

Step 07: Paper feed motor (DFM) OFF



↓

Step 08: Paper feed solenoid (DFSOL) ON







↓

Step 09: Paper feed motor (DFM) forward rotation



↓

* A Step 10: The paper exit sensor (DES) senses the lead





↓

* A Step 11: Transport motor (DTM) rpm down

↓

Step 12: The original feed sensor (DFD) senses the



↓

Step 13: The original is stopped by the resist roller and





↓

Step 14: Paper feed motor (DFM) reverse rotation







↓

Step 15: The original width sensor (DWS) senses the



↓

Step 16: The original timing sensor (DTD) senses the



↓

Step 17: Paper feed motor (DFM) OFF




↓

* A Step 18: Paper exit sensor (DES) senses the paper



↓

* A Step 19: Original discharge

↓

Step 20: Transport motor (DTM) OFF




↓

(Paper feed)

↓

Step 21: Transport motor (DTM) forward rotation




↓

Step 22: Paper feed motor (DFM) reverse rotation




↓

Step 23: Original width sensor (DWS) output HIGH

↓

Step 24: Original timing sensor (DTD) senses the




(The weight plate and the stopper move down
to press the original onto the semi-circular
roller.)

The original feed is started.

edge of the discharged original.
(DES output HIGH)

lead edge of the original. (DFD output HIGH)

the paper feed motor (DFM) is turned OFF.

(Resist roller rotation)
The original lead edge is taken up by the
resist roller.

original width. (Output LOW)

original lead edge. (DTD output HIGH)

(The original is stopped with its lead edge
taken up by the resist roller.)

exit rear edge. (DES output LOW)

(The transport belt and the paper exit roller
are stopped.)

(The transport belt and the paper exit roller
rotate.)

(Resist roller rotation)
The original is sent to the transport section.

original rear edge. (DFD output LOW)

– 7 –

↓

Step 25: Paper feed motor (DFM) OFF



↓

Step 26: Transport motor (DTM) OFF




↓

* B Step 27: Paper feed solenoid (DFSOL) OFF








↓

Step 28: Copier mirror base scanning is started.

↓

* E

DSS





↓

(Preliminary
paper feed)

↓

Step 29: Paper feed motor (DFM) forward rotation






↓

Step 30: The original feed sensor (DFD) senses the



↓

Step 31: The original is stopped by the resist roller.



↓

Step 32: Paper feed motor (DFM) reverse rotation






↓

Step 33: The original width sensor (DWS) senses the




↓

Step 34: The original timing sensor (DTD) senses the



↓

Step 35: Paper feed motor (DFM) OFF




↓

Step 36: Copier mirror base scanning is stopped.

↓

(Paper exit)

↓

Step 37: Transport motor (DTM) forward rotation




↓

* D Step 38: The previous original discharge

↓

Step 39: Paper feed motor (DFM) reverse rotation





(Resist roller stops.)

(Transport belt, paper exit roller stop)
Original stop

(The weight plate and the stopper move up.)
* B: If there is no original on the tray, move

up the stopper and the weight plate.

LOW (No original on the tray) → After
completion of mirror base scanning, go to
step 48.

HIGH (There are some originals on the tray.)

↓

(Paper feed roller, semi-circular roller rotation)
The original feed is started.

original lead edge. (DFD output HIGH)

Paper feed motor (DFD) OFF

(Resist roller rotation)
The original lead edge is taken up by the
resist roller.

original.
(Output HIGH)

original lead edge. (DTD output HIGH)

(The original is stopped with its lead edge
taken up by the resist roller.)

(Transport belt, paper exit roller rotation)
The original discharge is started.

(Resist roller rotation)
The original is sent to the transport section.

↓

Step 40: Paper exit sensor (DES) senses the original



↓

Step 41: Original width sensor (DWS) output HIGH

↓

Step 42: Original timing sensor (DTD) senses the



↓

Step 43: Paper feed motor (DFM) OFF



↓

Step 44: Paper exit sensor (DES) senses the




↓

* D Step 45: Transport motor (DTM) OFF




↓

Step 46: Paper feed solenoid (DFSOL) OFF








↓

Step 47: Copier mirror base scanning is started.

* E ↓

DSS



↓

Step 48: Transport motor (DTM) forward rotation



↓

* D Step 49: Previous original discharge

↓

Step 50: Paper exit sensor (DES) senses the




↓

Step 51: Transport motor (DTM) rpm down

↓

Step 52: Paper exit sensor (DES) senses the




↓

Step 53: Original discharge

↓

Step 54: Transport motor (DTM) OFF



↓

END

Note: * A: This operation is performed when there is an original on

the original table in advance. If there is no original on
the original table, this operation is not performed.

* B: This operation is performed when there is no original on

the original table.

* C: When the is an original on the original tray, the original

set sensor (DSD) output becomes LOW.

* D: When the previous original remains in the paper exit

section, it is discharged.

rear edge. (DES output HIGH)

original rear edge. (DTD output LOW)

(Resist roller stop)

discharged original rear edge. (DES output
LOW)

(Transport belt, paper exit roller stop)
Original stop

(The weight plate and the stopper move up.)
* B: When there is no original on the tray,

move up the stopper and the weight
plate.)

HIGH (There are some originals on the tray.)
→ Go to step 29 (Preliminary paper feed).

LOW (No original on the tray)

(Transport belt, paper exit roller rotation)

discharged original lead edge. (DES output
HIGH)

discharged original rear edge. (DES output
LOW)

(Transport belt, paper exit roller stop)

– 8 –

2) SF-A56 RAD mode (duplex copy mode) copying

START

↓

Step 01: The transport section is closed. (AUOD ON)

↓

Step 02: An original is set on the original tray. (DSS



↓

Step 03: Original feed display ON

↓

Step 04: Print SW ON

↓

(Preliminary
paper feed):

↓

* A Step 05: Paper feed motor (DFM) forward rotation








↓

Step 06: Reverse motor (DRM) forward rotation



↓

Step 07: Transport motor (DTM) rotation






↓

* A Step 08: Paper feed motor (DFM) OFF







↓

Step 09: Paper feed motor (DFM) forward rotation






↓

* B Step 10: Reverse sensor (RDD) senses the lead edge




↓

Step 11: Original feed sensor (DFD) senses the lead




↓

Step 12: Paper feed motor (DFM) OFF



↓

Step 13: Paper feed motor (DFM) reverse rotation






↓

Step 14: Original width sensor (DWS) senses the



↓

Step 15: Original timing sensor (DTD) senses the lead







output HIGH)

* A: For the first original, dummy paper exit

is performed.

(Paper feed roller, semi-circular roller
rotation)
Since the stopper is up, paper feed is not
performed.

(Reverse roller, paper exit roller rotation)

(Transport belt rotation)
* B: If there has been an original on the

tray, is discharged.

Paper feed solenoid (DFSOL) ON
(The weight plate and the stopper move down
to press the original onto the semi-circular
roller.)

(Paper feed roller, semi-circular roller
rotation)
The original feed is started.

of the discharged original.
(RDD output HIGH)

edge of the discharged original. (DFD output
HIGH)

The original is stopped by the resist roller.

(Resist roller rotation)
The lead edge of the original is taken up by
the resist roller.)

original width. (Output LOW)

edge of the original. (DTD output HIGH)

↓

Step 16: Paper feed motor (DFM) OFF




↓

* B Step 17: Reverse sensor (RDD) senses the rear edge






↓

Step 18: Transport motor (DTM) OFF



↓

* B Step 19: Original discharge

↓

Step 20: Reverse motor (DRM) OFF




↓

(Preliminary
paper feed):

↓

Step 21: Transport motor (DTM) forward rotation






↓

Step 22: Paper feed motor (DFM) reverse rotation




↓

Step 23: Original feed sensor (DFD)




↓

* C Step 24: Paper feed solenoid (DFSOL) OFF








↓

Step 25: Original width sensor (DWS) output HIGH

↓

Step 26: Original timing sensor (DTD) senses the rear











↓

Step 27: Reverse sensor (RDD) senses the lead edge



↓

Step 28: The lead edge of the original is moved



↓

Step 29: Transport motor (DTM) OFF


↓

Step 30: Reverse motor (RDM) OFF







(The original is stopped with its lead edge
taken up by the resist roller.)

of the discharged original. (RDD output LOW)
Reverse motor (DRM) rpm down

(Transport stop)

(Reverse roller, paper exit roller stop)
(Paper feed reverse)

Transport motor, reverse motor (DRM)
forward rotation (Reverse roller, paper exit
roller rotation)

(Resist roller rotation)
The original is sent to the transport section.

Senses the rear edge of the discharged
original. (DFD output LOW)

(The weight plate and the stopper move up.)
* C: If there is no original on the original

tray, move up the stopper and the
weight plate.

edge of the original.
(DTD output LOW)
Paper feed motor (DFM) OFF (Resist roller
stop)
Reverse solenoid (DRSOL) ON (The flapper
move up.)

of the original. (RDD output HIGH)

counterclockwise by the flapper.

(Transport belt stop)

(Reverse roller, paper exit roller stop)

– 9 –

↓

Step 31: Transport motor (DTM) OFF



↓

Step 32: Reverse motor (DRM) forward rotation






↓

Step 33: Paper exit sensor (RDD) senses the rear




↓

Step 34: Reverse motor (DRM) OFF



↓

Step 35: Transport motor (DTM) OFF




↓

Step 36: Reverse solenoid (DRSOL) OFF



↓

Step 37: Copier mirror base scanning is started.

* D ↓

DSS output





↓

(Preliminary
paper feed)

↓

Step 38: Paper feed motor (DFM) forward rotation






↓

Step 39: Original feed sensor (DFD) senses the lead




↓

Step 40: Paper feed motor (DFM) OFF



↓

Step 41: Paper feed motor (DFM) forward rotation






↓

Step 42: Original width sensor (DWS) senses the



↓

Step 43: Original timing sensor (DTD) senses the lead



↓

Step 44: Paper feed motor (DFM) OFF




↓

Step 45: Copier mirror base scanning stop



↓

(Transport belt rotation)

(Reverse roller, paper exit roller rotation)
The original is transported to the paper feed
section.

edge of the reverse original.
(RDD output LOW)

(Reverse roller, paper exit roller stop)

(Transport belt stop)
Original stop

(The flapper moves down.)

LOW (There is no original on the tray.) →
After completion of mirror base scanning, go
to step 64. (Reverse rotation)

HIGH (There is an original on the tray)

↓

(Paper feed roller, semi-circular roller
rotation)
The original feed is started.

edge of the original.
(DFD output HIGH)

The original is stopped by the resist roller.

(Resist roller rotation)
The lead edge of the original is taken up by
the resist roller.

original width. (Output LOW)

edge of the original. (DTD output HIGH)

(The original is stopped with its lead edge
taken up by the resist roller.)

↓

(Reverse
rotation)

↓

Step 46: Reverse solenoid (DRSOL) ON



↓

Step 47: Transport motor (DTM) forward rotation






↓

Step 48: Reverse sensor (RDD) senses the lead edge




↓

Step 49: The lead edge of the original is moved



↓

Step 50: Transport motor (DTM) OFF



↓

Step 51: Reverse motor (DRM) OFF



↓

Step 52: Transport motor (DRM) reverse rotation



↓

Step 53: Reverse motor (DRM) reverse rotation






↓

Step 54: Reverse sensor (RDD) senses the rear edge




↓

Step 55: Reverse motor (DRM) OFF



↓

Step 56: Transport motor (DTM) OFF




↓

Step 57: Reverse solenoid (DRSOL) OFF



↓

Step 58: Copier mirror base scanning start

↓

Step 59: Copier mirror base scanning stop

* E ↓

First-out

original



↓

(Paper exit
paper feed
reverse)










(The flapper moves up.)

(Transport motor rotation)
Reverse motor (DRM) forward rotation
(Rreverse roller, paper exit roller rotation)

of the original.
(RDD output HIGH)

counterclockwise by the flapper.

(Transport belt stop)

(Reverse roller, paper exit roller stop)

(Transport belt rotation)

(Reverse roller, paper exit roller rotation)
The original is transported to the paper feed
section.

of the reversed original.
(RDD output LOW)

(Reverse roller, paper exit roller stop)

(Transport belt stop)
Original stop

(The flapper moves down)

NONE → After completion of mirror base
scanning, go to step 82.

YES

↓

– 10 –

↓

Step 60: Transport motor (DTM) forward rotation







↓

Step 61: Paper feed motor (DFM) reverse rotation




↓

Step 62: Original feed sensor (DFD) senses the rear




↓

* C Step 63: Paper feed solenoid (DFSOL) OFF








↓

Step 64: Original width sensor (DWS) output LOW

↓

Step 65: Original timing sensor (DTD) senses the rear



↓

Step 66: Reverse sensor (RDD) senses the lead edge




↓

Step 67: Transport motor (DTM) rpm down

↓

Step 68: Original discharge

↓

Step 69: Reverse solenoid (DRSOL) ON



↓

Step 70: Transport motor (DTM) forward rotation






↓

Step 71: Reverse sensor (RDD) senses the lead edge




↓

Step 72: The lead edge of the original is moved



↓

Step 73: Transport motor (DTM) OFF



↓

Step 74: Reverse motor (DRM) OFF



↓

Step 75: Transport motor (DTM) reverse rotation



↓

Step 76: Reverse motor (DRM) forward rotation











(Transport belt rotation)
Reverse motor (DRM) forward rotation
Reverse roller, paper exit roller rotation)
The original is discharged.

(Resist roller rotation)
The original is sent to the transport section.

edge of the original.
(DFD output LOW)

(The weight plate and the stopper moves up.)
* C: When there is no original on the tray,

move up the stopper and the weight
plate.

edge of the original. (DTD output LOW)

of the discharged original.
(RDD output HIGH)

(The flapper moves up.)

(Transport belt rotation)
Reverse motor (DRM) forward rotation
(Reverse roller, paper exit roller rotation)

of the original.
(RDD) output HIGH)

counterclockwise by the flapper.

(Transport belt stop)

(Reverse roller, paper exit roller stop)

(Transport belt rotation)

(Reverse roller, paper exit roller stop)
The original is sent to the paper feed section.

↓

Step 77: Reverse sensor (RDD) senses the rear edge



↓

Step 78: Reverse motor (RDD) senses the rear edge



↓

Step 79: Transport motor (DTM) off




↓

Step 80: Reverse solenoid (DRSOL) OFF



↓

Step 81: Copier mirror base scanning start



* D

Note: * A: For the first original, the preliminary paper feed opera-


↓

DSS output







↓

(Paper exit)

↓

Step 82: Transport motor (DTM) forward rotation







↓

Step 83: Reverse sensor (RDD) senses the lead edge




↓

Step 84: Reverse sensor (RDD) senses the rear edge









↓

Step 85: Original discharge

↓

Step 86: Reverse motor (DRM) OFF



↓

END

tion is performed.

* B: When there is an original on the original tray in ad-

vance, it is discharged.

* C: When there is no original on the original tray, move up

the weight plate and the stopper.

* D: When there is no original on the original tray, the origi-

nal set sensor (DSS) output becomes LOW.

* E: It depends on whether there is any preliminary fed origi-

nal in step 38 ∼ step 44.

of the reverse original. (RDD output LOW)

of the reversed original. (RDD output LOW)

(Transport belt stop)
Original stop

(The flapper moves down.)

LOW (No original on the tray) → After
completion of mirror base scanning, go to
step 46 (reverse).

HIGH (There is an original on the tray.) → Go to
step 38 (Preliminary paper feed).

↓

(Transport belt rotation)
Reverse motor (DRM) forward rotation
(Reverse roller, paper exit roller rotation)
The original is discharged.

of the discharged original.
(RDD output HIGH)

of the discharged original.
(RDD output LOW)
Transport motor (DTM) OFF
(Transport belt stop)
Reverse motor (DRM) rpm down

(Reverse roller, paper exit roller stop)

– 11 –

B. Original size detection

The original size is detected in three ways of different purposes.

1) Original size detection by the original set tray

The original size detection by the original set tray is used in automatic
paper size and automatic magnification selection mode, in order to
recognize the original size when the original is set on the original tray,
allowing the automatic selection of paper size and magnification ratio
of copy.

When originals composed of sheets of different sizes are set, this
detection method recognizes the largest sheet as the original size,
which is determined by the width measured by the original width
volume (DWVR) and the length measured by the original length sen­sors (DLS1, DLS2).

The original size is determined in the timing of original sensing by the
original set sensor (DSS).

DLS1 DLS2

DWVR

AB series

Inch series

Document size,

setting orientation

A4 3 ● —
B5 4 ● —
A5 5 ● —
A5R 7 ● —
B5R 6 | —
A4R 5 | —
B4 4 | —
A3 3 | —
11" × 8.5" 0 ●●

8.5" × 5.5" 1 ●●

8.5" × 5.5"R 2 ●●
11" × 8.5R" 1 | ●
14" × 8.5" 1 ||
11" × 17" 0 ||

F: ON or L output (sensed)

●: OFF or H output
DWVR DLS1 DLS2

– 12 –

2) Original size detection by the original width sensor
(DWS) in the paper feed section

The original size detection by the original width sensor (DWS) in the
paper feed section is used in automatic paper size and automatic
magnification ration selection mode to determine whether the original
is A4 or A5 (11" x 8.5" or 8.5" x 5.5").

When originals composed of stacked sheets of different sizes are set
in the original tray, the original size cannot be detected by the sen­sors in the original tray. Therefore, this function is provided to sense
the original size behind the resist roller after the paper feed section
has fed the original, as far as originals of A4 or A5 size (11" x 8.5" or

8.5" x 5.5") (portrait) is concerned. Consequently, if A4- and A5-size

(11" x 8.5" or 8.5" x 5.5") originals (portrait) are stacked and set in the
original tray, the original size detection by the paper feed section
original width sensor (DWS) has the priority over the original size
detection by the original set tray.

When A4- and A5-size (11" x 8.5" and 8.5" x 5.5") originals (portrait)
are stacked and set in the original tray, the original length sensors
(DSL1, DSL2) are not actuated. Therefore, the original width is
sensed by the paper feed section original width sensor (DWS) to
judge A4 or A5 (11" x 8.5" or 8.5" x 5.5").

Paper feed section original width sensor (DWS)

A4

B5

Paper feed section original width sensor (DWS)

11"x8.5"

8.5"x5.5"

Paper feed section original width sensor (DWS)

Paper feed section original width sensor (DWS) status

Original size

A4 |
B5 ●

F: Output LOW (Detection)

●: Output HIGH

Paper feed section original width sensor (DWS)

Paper feed section original width sensor (DWS) status

Original size

11" × 8.5" |

8.5" × 5.5" ●

– 13 –

F: Output LOW (Detection)

●: Output HIGH

3) Original size detection by the paper feed motor
rotation sensor (DFMRS)

This function compensates for the inaccuracy of the original size
recognition in the original tray when originals of different sizes are
stacked in the original tray. That is, results of this function has priority
over the original size detection in the original tray. The pulses of the
slit disc rotation of the feed motor (DFM) are counted in the period
before the rear edge of original is sensed (DFD output LOW) by the
original feed sensor after the feed motor (DFM) has started reverse
rotation, that is, after the resist roller has started rotating and feeding
of original from the fed section to the transport section has been
started, to determine the original length.

To improve detection accuracy, the original width is sensed also by
the paper feed section original width sensor (DWS).

Resist roller rotation start (The original is fed from the paper feed
section.)

Original feed sensor (DFS)

A

[6] DISASSEMBLY, ASSEMBLY AND

ADJUSTMENT

* Descriptions in this chapter excludes simple disassembly and as-

sembly operations. Refer to the parts guide for the disassembly ad
assembly of parts which are not explained here.

* Refer to the description in [7] ACTUAL WIRING DIAGRAM for the

processing of the wiring during assembly.

1. Transport section opening

1 Loosen two screws which are fixing the hinge stopper to allow the

hinge stopper to move.

2 Slide the hinge stopper downward by using the step screw, fit the

dove with the hole and tighten the two fixing screws which were
loosen before.

3 Open the transport section.

Resist roller

Original feed sensor (DFD)

B

Resist roller

The paper feed motor rotation sensor (DFMRS) counts the number of
rotations of the paper feed motor (DFM) between A and B to judge
the original length.

Original feed sensor (DFS)
detects the original rear edge.

Screw (Loosen.)

Hinge stopper (Move down.)

– 14 –

2. Belt unit dis asse mb ly

3. Paper feed unit disassembly

1 Open the transport section.
2 Remove two screws as shown in the figure below, and remove the

belt unit as shown with arrow A and arrow B in this sequence.

A

Screw
(Loosen.)

Belt unit

1 Open the transport section.
2 Remove the tray. (Refer to the installing procedure.)
3 Remove four screw which are fixing the lower cover, and remove

the blower cover.

4 Remove the five fixing screws of the paper feed unit, open the

paper feed cover, and remove the fixing screw.

Paper feed
cover

Paper feed unit
fixing screw
(Loosen.)

Paper feed unit
fixing screws

Paper feed unit

Lower cover

5 Remove the paper feed motor drive belt, and remove the four

harness connectors. Then remove the paper feed unit.

B

Harness
connector
(Remove.)

Paper feed
unit

Paper feed motor
drive belt (Remove.)

Paper feed
motor

– 15 –

4. Paper exit un it dis asse mb ly

1 Open the transport section and remove the lower cover.
2 Remove the five fixing screw of the paper exit unit.
3 Remove the paper exit unit harness connector from the control

PWB, and pull out the harness from the edge saddle shown in the
figure below. Then remove the paper exit unit.

3 Remove two screws from the separation unit, and remove the

separation roller holder unit.

Screw
(Remove.)

Edge saddle

Screw

SF-A56 SF-A17

Screw

Separation roller
holder unit

Reverse
unit

4 Remove two springs from the separation roller holder, and remove

the bearing and the slide bearing. Remove the separation roller
and the spring clutch.

Spring
(Remove.)

5. Separation roller disassembly

1 Open the paper feed cover.
2 Remove two fixing screws of the separation unit, and remove the

separation unit.

Screw (Remove.)

Separation unit

Slide shaft
bearing

Separation roller

Spring clutch

Shaft bearing

– 16 –

6. Semi-circular roller, paper feed roller

disassembly

1 Open the paper feed cover.
2 Loosen two fixing screws of the tray guide top, and remove two

fixing screws of the side.

3 Remove the harness from the tray guide upper, and remove the

tray guide.
(Be careful not to scratch the harness.)

7. Open/close switch attachment

When closing the transport section from the open state, adjust the
DF open SW plate so that the clearance between the glass surface
and the DF spacers L and R (front side) is 10 ∼ 40mm. Then tighten
the fixing screw.

Side fixing screw
(Remove.)

Tray guide

Side fixing
screw
(Remove.)

Harness
(Remove.)

Top fixing screw
(Remove.)

4 Remove the snaps from the both ends of the pickup shaft and the

separation shaft. (2 kinds of snaps)

5 Remove the pickup shaft bearing and the separation shaft bearing

on the front frame side.

6 Slide the pickup shaft toward the rear frame, and pull out the front

frame side from the chassis.

7 Remove the shaft stopper and the parallel pin from the pickup

shaft and remove the semi-circular shaft.

8 Slide the separation shaft toward the rear frame, and pull out the

front frame side from the chassis.

9 Remove the shaft stopper from the separation shaft, and remove

the paper feed roller.

10~40mm

Microswitch

Fixing
screw

DF open SW plate

8. Original transport belt replacement

1 Remove the belt unit.
2 Remove the two screws shown in the figure below to allow the

belt tension plate to be moved. Remove the transport belt with the
left and the right in parallel.

Original
transport
belt

Shaft stop

Pickup shaft

Snap

Rear frame
side

Semi-circular roller

Parallel pin

Separation shaft

Snap

Bearing

Paper feed
roller

Front frame
side

Shaft stop

Screw
(Remove.)

Belt tension plate

– 17 –

[Note for assembly]

1 When installing the original transport belt, put the right and left in

parallel, and allow the same clearance between the spacer and
the belt in the front side and in the rear side.

Spacer

Belt unit

Spacer

Spacer

Spacer

[7] CONNECTOR LAYOUT

1. Control PWB peripheral

IF harness

Control PWB

RU harness

2 Check that the original transport belt is not on the belt guide.

Belt guide

Transport belt

Transport belt

Belt guide

Drive R harness

Drive I/F harness

Control PWB

Control PWB

TR1 harness

SNR harness

SENSOR I/F
harness

Transport motor (DTM)

LED harness

SENSOR I/F
harness

Drive I/F harness

– 18 –

2. Paper feed motor peripheral

4. Reverse un it sect io n (Fro nt side)

Paper feed motor (DFM)

Paper feed motor
rotation sensor

Original set
sensor (DSS)

TR2 harness

Drive F harness

SENSOR 2 harness

SENSOR harness

Paper feed
guide switch
(FGOD)

RU harness

Reverse solenoid (DRSOL)

5. Reverse un it sect io n (Rear side )

Reverse guide switch

(TGD)

Reverse motor (DRM)

Paper feed motor
(DFM)

Paper feed motor rotation
sensor (DRMRS)

3. Paper feed section (Front side)

Control PWB

RU harness

SENSOR 2
harness

Drive R harness

6. Tray inside

Original length sensor 2 (DLS2)

Inch series

Original length sensor 1 (DLS1)

Tray harness

Original end
sensor (DED)

Paper feed solenoid (DFSOL)

SOL harness

Original width volume
sensor (DWVR)

– 19 –

[8] REPLACEMENT PARTS AND

MAINTENANCE

1. Replacement parts

2. Mode setting in the test mode when supplying the power
Switch ON OFF

Push switch RADF individual unit

operation test mode
DIP switch 1 For AB series For inch series
DIP switch 2 Thin paper mode Normal paper mode

PPC main body
connection mode

Part name Replacement timing
Separation roller 100K copies
Transport belt 100K copies

2. Maintenance parts (Cleaning at every
10K copies)

Clean the parts shown in the table below at maintenance as specified
in the table.

Part name Cleaning method
Original set sensor (DSS) Air blow
Original feed sensor (DFD) Air blow
Original timing sensor (DTD) Air blow
Original width sensor (DWS) Air blow
Paper exit sensor (DES) Air blow
Reverse sensor (RDD) Air blow
Paper feed roller Wipe with alcohol.
Semi-circular roller Wipe with alcohol.
Resist roller Wipe with alcohol.
Paper exit roller Wipe with alcohol.
Reverse roller Wipe with alcohol.

3. Kinds of test modes and DIP switch setting
No. Test mode DIP switch

1 Single paper pass mode All OFF
2 Duplex paper pass mode 1 is ON, all the others

OFF

3 Single aging mode 1 and 3 ON; 2, 4, and 5

4 Duplex aging mode 4 ON, all the others OFF
5 Single paper pass mode

(Thin paper mode)

6 Duplex paper pass mode

(Thin paper mode)
7 Load check mode 1, 5 ON; 2, 3, 4 OFF
8 EEPROM initializing mode

+ all sensors adjustment

mode

10 Resist sensor adjustment

mode

11 Timing sensor adjustment

mode

12 Paper reverse sensor

adjustment mode

* "5" and "6" are for thin paper mode (only in Japan).

OFF

3, 4 ON; 2, 5 OFF

1, 3, 4 ON; 2, 5 OFF

3, 5 ON; 1, 2, 4 OFF

4, 5 ON; 1, 2, 3 OFF

1, 4, 5 ON; 2, 3 OFF

3, 4, 5 ON; 1, 2 OFF

3. DIP switch

The DIP switch on the control PWB shown below allows the individual
operation check of the RADF (ADF).

(1) Control PWB outline

DRIVER FOR MOTOR

DIP SW

CPU

(2) DIP switch outline

OFF

ON

SW No.1 2 3 4 5

1. Entering the test mode:
While pressing the push switch on the control PWB, supply the

power, and the machine will enter the test mode.

DRIVER FOR MOTOR

Push SW

EEPROM

G/A

4. Detail s of the test modes

Set the DIP switch on the control PWB, and open/close the DF to set
the test mode.

Setting of the original size series (AB/Inch) and of normal/thin paper
mode should be performed only when supplying the power.

(1) Single paper pass mode (paper present)

When originals are set on the paper feed tray, the original feed LED
lights up. When the push switch is pressed, all the originals on the
tray are fed.

(2) Duplex paper pass mode (paper present)

When originals are set on the paper feed tray, the original feed LED
lights up. When the push switch is pressed, all the originals on the
tray are fed.

(3) Single aging mode (without paper)

When the push switch is pressed, aging is started. The operation
timing is determined by size detection of each original size.

(4) Duplex aging mode (without paper)

When the push switch is pressed, aging is started. The operation
timing is determined by size detection of each original size.

(5) Thin paper single paper pass mode

When originals are set on the paper feed tray, the original feed LED
lights up. When the push switch is pressed, all the originals on the
tray are fed.

– 20 –

(6) Thin paper duplex paper pass mode

When originals are set on the paper feed tray, the original feed LED
lights up. When the push switch is pressed, all the originals on the
tray are fed.

(7) Load check mode

Every time when the push switch pressed, the following operation is
performed in sequence repeatedly.

1. Read LED/Original remain LED ON, paper feed motor reverse

rotation (500mm/sec)

2. Operation stop

3. Ready LED/Original remain LED ON, paper feed motor forward

rotation (250mm/sec)

4. Operation stop

5. Ready LED/Original remain LED ON, electromagnetic clutch

ON, transport motor forward rotation (800mm/sec)

6. Operation stop

7. Ready LED/Original remain LED ON, electromagnetic clutch

ON, transport motor forward rotation (250mm/sec)

8. Operation stop

9. Ready LED/Original remain LED ON, electromagnetic clutch

ON, transport motor forward rotation (800mm/sec)

10. Operation stop

11. Ready LED/Original remain LED ON, electromagnetic clutch

ON, transport motor forward rotation (250mm/sec)

12. Operation stop

13. Ready LED/Original remain LED ON, electromagnetic clutch

ON, paper feed motor synchronization forward rotation
(800mm/sec)

14. Operation stop

15. Ready LED/Original remain LED ON, shutter solenoid ON

16. Operation stop

17. Ready LED/Original remain LED ON, weight solenoid ON

18. Operation stop

19. Ready LED/Original remain LED ON, electromagnetic clutch ON

20. Operation stop

21. Ready LED/Original remain LED ON, electromagnetic brake ON

22. Operation stop

23. Ready LED/Original remain LED ON, flapper solenoid ON

24. Operation stop

25. Ready LED/Original remain LED ON, shutter solenoid ON,

weight solenoid ON, paper feed motor reverse rotation
(500mm/sec)

26. Operation stop

Return to 1.

(9) Resist sensor adjustment mode

(10) Timing sensor adjustment mode

(11) Paper reversing sensor adjustment mode

When the push switch pressed, the adjustment of each sensor is
started. At that time, the LED blinks in the cycle of 100msec. After
completion of the adjustment, the LED turns ON. If there is an error in
the adjustment, the LED blinks in the cycle of 100msec.

JAM, error kinds LED display

Sensor adjustment
upper limit error

Sensor adjustment
lower limit error

Original remain LED blinks in the cycle
of 100msec. Ready LED goes off.

Original remain LED goes off. Ready
LED blinks in the cycle of 100msec.

5. Kinds of errors (RADF single mode
only)

The table below lists the kinds of JAM errors and LED display exam­ples.

To cancel the JAM/motor lock errors, cancel the JAM and open/close
the ADF, or supply the power again.

JAM error kinds LED display

Not reached/remaining JAM in the
paper feed section

Not reached/remaining JAM in the
paper feed section

Paper feed motor lock error Original remain LED blinks

Paper exit motor lock error Ready LED blinks in the

Resist/timing sensor adjustment
error (when supplying the power)

Paper reversing sensor adjustment
error (when supplying the power)

Original remain LED blinks
in the cycle of 100msec.

Ready LED blinks in the
cycle of 100msec.

in the cycle of 200msec.

cycle of 200msec.
Original remain LED blinks

in the cycle of 100msec.
Ready LED blinks in the

cycle of 100msec.

(8) EEPROM initializing + all sensors adjustment

mode

When the push switch is pressed, the EEPROM is initialized. At that
time, the LED blinks in the cycle of 100msec. After completion of
initializing of the EEPROM, the LED turns ON. If there is an error in
initializing of the EEPROM, the LED goes off. After initializing the
EEPROM, adjust the resist sensor, the timing sensor, and the paper
reversing sensor.

JAM, error kinds LED display

EEPROM initializing error Ready LED/Original remain

LED OFF

– 21 –

[9] ELECTRICAL SECTION

1. Genera l

This circuit controls feeding, stopping, and reversing of the original. It is composed of sensors, switches, the circuit which processes signals from the
copier PPC, the circuit which drives motors, solenoids, and clutches, the CPU, the G/A and its peripheral circuits.

2. Block diagram

DFD

DTD

DFMRS

DWVR

DWS

DLS1
DLS2

DED

TXD
RXD
DTR
DSR
RES

SGND

Communication

I/O circuit

Original feed
sensor input
circuit

Timing sensor
input circuit

DIP switch
push switch

Paper feed motor
rotation sensor
input circuit

Original width
volume input
circuit

Original width
sensor input
circuit

Original length
sensor input
circuit

Original end
sensor input
circuit

CPU
(IC11)

Display LED
lighting circuit

Transport
motor drive
circuit

Paper exit
reverse motor
drive circuit

EEPROM
(IC3)

DATA BUS

ADRESS DATA BUS

Reset circuit

Address

latch

(IC2)

A

B

Oscillation
circuit

5.0MHz

ADRESS BUS

ROM
(IC2)

G/A
(IC7)

ADF FEED lamp
REMOTE DOCUMENT lamp

Paper feed
motor drive
circuit

Current
control circuit

Paper feed
solenoid drive
circuit

Reverse
solenoid drive
circuit

A

DFSOL

DRSOL

DFM

A56

DTM

A17

A56

A56

DES

RDD

DSS

AUOD
FGOD

TGOD

Paper exit
sensor input
circuit

Reverse
sensor input
circuit

Original set
sensor input
circuit

Cover
open/close
switch input
circuit

Oscillation
circuit

9.83MHz

SF-A56 only

SF-A17 only

– 22 –

DC+24V

+5V
SGND
PGND

B

Power input
circuit

Rush current
prevention
circuit

A56

DRM

DC+24V
+5V

3. Operations

A. Sensor input circuit

[a] Original timing sensor (DTD)

The original timing sensor is a reflection type sensor, and the LED and the photo transistor are integrated into one. Infrared light emitted from the
LED is reflected by the mirror on the opposite side, and the reflected light enters the photo transistor to increase the photo current in the photo
transistor, detecting "No original."

On the other hand, if there is an original between the LED and the mirror, there is no reflection from the mirror. Therefore the photo current does not
increase and the original is detected.

This circuit is also provided with the automatic adjustment function.
The LED cathode is connected to the voltage-current conversion circuit composed of the operation amp (IC13), Q3, and R94. The current value is

controlled with the D-A output (analog voltage output) from the CPU. That is, the operation is made so that the CPU D-A output value (IC11-67 pin)
is equal to IC13 2 pin input voltage (the voltage drop of LED current by R94).

When, therefore, the D-A output value is changed, the current value is also changed.
On the other hand, the photo current of the photo transistor is converted into a voltage value by load resistor R95, and is inputted to IC9 4 pin and

the CPU 57 pin through the noise filter composed of R10 and C19.
R78, R80, R45, and IC9 form a voltage comparator, which compares the input voltage from the sensor with the threshold voltage (about 2V)

generated by dividing +24V with R78 and R80.
When the sensor input voltage exceeds the threshold voltage, the output of IC9 2pin turns LOW, being inputted to the CPU 72 pin as "No original"

signal.
The CPU 57 pin is an A-D input pin, which converts an analog voltage into a digital value inside the CPU. Since the sensitivity of a sensor generally

varies, it is automatically adjusted with the sensitivity at "No original" as the reference voltage. That is, the sensor voltage at "No original" is A-D
inputted to change the D-A output voltage, varying the LED current (LED light intensity) and controlling by the CPU so that the sensor voltage is the
specified constant level.

The D-A output value at that time is unique to every machine, and is stored in the EEPROM (IC3).

Original timing
sensor DTD

PH110M

TLN119B

173979-3

+5V
DTD
DTDLED

CN20-3
CN20-2
CN20-1

CN3-1
CN3-3

CN3-2

+5v
DTDLED

DTD

+5V

AGND

R95

2.0K

R10
10K

2SC2712

C19

0.10µ F

Q3

AN+24V

AGND

R78
22K

R80

2.0K

100K

5
4

R86
10K

R45

IC9-1

µ PC339G2

IC13-1

1

µ PC358G2

2

TP7

3
2

R94
100

C5
1000PF

1000PF

+5V

R53

4.7K

TP8

TP11

67

72

57

CPU
(IC11)

ANO0

P21/INTP0

P71/ANI1

Original timing sensor input circuit

– 23 –

[b] Original feed sensor (DFD)

The original feed sensor is a reflection type sensor, and the LED and the photo transistor form a pair. Infrared light emitted from the LED is reflected
by the mirror on the opposite side, and the reflected light enters the photo transistor to increase the photo current in the photo transistor, detecting
"No original."

On the other hand, if there is an original between the LED and the mirror, there is no reflection from the mirror. Therefore the photo current does not
increase and the original is detected.

This circuit is also provided with the automatic adjustment function.
The LED cathode is connected to the voltage-current conversion circuit composed of the operation amp (IC13), Q3, and R94. The current value is

controlled with the D-A output (analog voltage output) from the CPU. That is, the operation is made so that the CPU D-A output value (IC11-68 pin)
is equal to IC13 5 pin input voltage (the voltage drop of LED current by R93).

When, therefore, the D-A output value is changed, the current value is also changed.
On the other hand, the photo current of the photo transistor is converted into a voltage value by emitter resistor R66, and is inputted to IC9 6 pin and

the CPU 56 pin through the noise filter composed of R101and C14.
R79, R81, R46, and IC9 form a voltage comparator, which compares the input voltage from the sensor with the threshold voltage (about 2V)

generated by dividing +24V with R79 and R81.
When the sensor input voltage exceeds the threshold voltage, the output of IC9 1pin turns LOW, being inputted to the CPU 73 pin as "No original"

signal.
The CPU 56 pin is an A-D input pin, which converts an analog voltage into a digital value inside the CPU. Since the sensitivity of a sensor generally

varies, it is automatically adjusted with the sensitivity at "No original" as the reference voltage. That is, the sensor voltage at "No original" is A-D
inputted to change the D-A output voltage, varying the LED current (LED light intensity) and controlling by the CPU so that the sensor voltage is the
specified constant level.

The D-A output value at that time is unique to every machine, and is stored in the EEPROM (IC3).

Original feed
sensor DFD

PH110M

TLN119B

173979-3

+5V
DFD
DFDLED

CN21-1
CN21-2
CN21-3

+5V

+5v

CN3-4

DFDLED

CN3-6

CN3-5

DFD

AGND

R66

4.7K

R11
10K

2SC2712

AN+24V

C14

0.10µ F

Q4

AGND

Original feed sensor input circuit

R79
22K

R81

2.0K

R87
10K

7
6

R46

100K

IC9-2

µ PC339G2

IC13-2

1

µ PC358G2

1

CPU

TP12

(IC11)
5
6

R93
100

C6
1000PF

+5V

R54

4.7K

TP12

TP10

68

73

56

ANO1

P22/INTP1

P70/ANI0

– 24 –

[c] Reverse sensor (RDD) --- SF-A56 only

The reverse sensor is a reflection type sensor, and the LED and the photo transistor are integrated into one. Infrared light emitted from the LED is
reflected by the mirror on the opposite side, and the reflected light enters the photo transistor to increase the photo current in the photo transistor,
detecting "No original."

On the other hand, if there is an original between the LED and the mirror, there is no reflection from the mirror. Therefore the photo current does not
increase and the original is detected.

This circuit is also provided with the automatic adjustment function.
The LED cathode is connected to the circuit composed of R107, R108, and Q17. A high level or a low level input is passed to the base of Q17 to

vary the LED light quantity.
The base of Q17 is connected to the CPU 49 pin. When the CPU outputs a low level signal, Q17 is turned off and all forward current in the LED

flows through R108.
On the contrary, when the CPU outputs a high level signal, Q17 is turned on and the forward current in the LED flows through R108 and R107 in

parallel. That is, the forward current in the LED is doubled, increasing the light quantity.
On the other hand, the output voltage of the photo transistor is inputted through the noise filter composed of R32 and C20 to IC9 10 pin.
IC9 and R48 form a voltage comparator, which compares the sensor output voltage inputted to 10 pin and the threshold voltage inputted to 11 pin.
When the sensor output voltage is lower than the threshold voltage, the output at IC9 13 pin turns HIGH and the "original present" signal is inputted

to the CPU (IC11) 75 pin.
Since the sensitivity of a sensor generally varies, it is automatically adjusted with the sensitivity at "No original" as the reference voltage. That is, the

sensor voltage at "No original" is reduced into 1/3 by R74 and R63 and inputted to the CPU 58 pin.
At that time, the base of Q17 is at LOW level and the light quantity of the LED is kept low. The CPU 58 pin is an A-D input pin, which allows

conversion of an analog voltage into a digital voltage in the CPU. When the sensor output voltage inputted to the CPU is in the range of 1V ∼ 4.5V,
the gate array outputs from 18 pin the PWM signal of the duty corresponding to the voltage inputted to the CPU 58 pin.

The PWM signal is inputted to the integral circuit composed of R31 and C46 and converted into an analog voltage to be inputted to IC14 3 pin.
The converted analog output is the same as the sensor output voltage inputted to the CPU.
C22, R7, R6, and IC14 form a non-reverse amplifier, which amplifies the analog voltage inputted to IC14 3 pin to be double and outputs from 1 pin.
The output voltage is inputted to IC9 11pin as the threshold voltage, and compared with the sensor output voltage. That is, the threshold value is set

to 2/3 of the HIGH level of each sensor output. When the sensor output voltage inputted to the CPU 58 pin is lower than 1V, the gate array 18 pin
outputs a HIGH level signal to increase light quantity of the LED. If the output voltage is increased to the range of 1V ∼ 4.5V by this, the threshold
value setting similar to the above is performed.

If the sensor output voltage remains lower than 1V even though the light quantity of the LED is increased, it is judged as a sensor error.
If the sensor output voltage inputted to the CPU 58 pin is greater than 4.5V, the threshold value cannot be set and it is judged as a sensor error.
The set threshold voltage and the logic of CPU 49 pin when setting are unique to each machine and stored in the EEPROM (IC3).

Reverse
sensor
RDD

PH110M

TLN119B

173979-3

AN+24V
RDD
RDDLED

CN36-3
CN36-2
CN36-1

CN8-1
CN8-2
CN8-3

+5V

+5v
RDD
RDDLED

AGND

AGND

R6
10K

R108

2.2K

AGND

R7

10K

2
3

R107

2.2K

C22

0.010µ F

IC14-1

µ PC358G2

Reverse sensor input circuit

TP50

Q17

FA1L3M

1

AGND

R72

4.7K

C46

0.10µ F

TP47

R31

4.7K

R32
10K

R74

3.0K

AGND

AGND

C20

0.10µ F

R63

1.5K

R70
10K

10
11

AGND

IC9-4

13

µ PC339G2
R48

100K

C15

0.10µ F

+5V

+5V

D4
SB02-03Q

R64
10K

R23

4.7K

TP14

TP16

58

49

75

18

CPU
(IC11)

P72/ANI2

P12

P24/INTP3

G-A
(IC7)

PWM5

– 25 –

[c’] Paper exit sensor (DES) --- SF-A17 only

The DES uses a photo interrupter which is integrated with the light emitting diode and the photo transistor.
When there is an original, the lever-type actuator interrupts the optical path. The signal is passed the noise filter composed of R25, C15 and

Schmidt trigger invertor (IC4) to the CPU (IC11 77 pin).

+5V

Paper exit
sensor DES

TLP1240(C5)

VCC
VOUT
GND

1-173981-5
CN8-3
CN8-4
CN8-5

+5V
RES
GND

R102

180

R117
15K

R25

10K

C15

0.010µ F

IC4-3

65

TC74HC14AF

CPU
(IC11)

77

P26

Paper exit sensor input circuit

[d] Paper feed motor rotation sensor (DFMRS)

This sensor senses rotation of the paper feed motor, and is composed of the photo interrupter built in the amplifier and the slit disc attached to the
motor shaft. The pulse signals corresponding to the motor speed are obtained. the motor rotation speed is sensed from the frequency of the pulse
signals, and the motor rotation amount is sensed by counting the pulse numbers.

The input section of signals is a noise filter composed of R55, C24, and Schmidt trigger invertor, which processes signals.

Paper feed motor
rotation sensor
DFMRS

TLP1225(C5)

Constant-voltage
power source

VCC
VOUT
GND

CN2-6

CN2-5

CN2-4

173981-9

+5v
DFMRS
GND

+5V

+5V

R56

4.7K
R55

4.7K

C24
3300PF

IC4-5

1011

TC74HC14AF

TP13

CPU
(IC11)

74

P23/INTP2/CI

Paper feed motor rotation sensor input circuit

[e] Tray original size sensor, volume circuit

This circuit senses the original size on the tray, and its sensor section is built in the tray.
The original width is sensed by the slide volume (DWVR), and the original length is sensed by the two photo interrupters (DLS1, DLS2). (Only DSL1

for AB series)
The DWVR varies the resistance of the variable resistor with the lever attached to the original guide, and the variation is sensed as the voltage

value.
The signal is analog-inputted to the CPU A-D input pin (IC11 59 pin). On the other hand, DSL1 and DSL2 use the photo interrupter which is

integrated with the light emitting diode and the photo transistor. When there is an original, the lever-type actuator interrupts the optical path. The
signal is inputted through the noise filter to the CPU.

DSL1: IC11 62 pin
DSL2: IC11 63 pin

The original end sensor (DED) which senses the third original also uses a photo interrupter, and the signal is inputted through the noise filter to the
CPU (IC11 78 pin).

Original width
volume DWVR

Original length
sensor 1 DLS1

Original length
sensor 2 DLS2

Original end
sensor DED

GP1A25LC

GP1A25LC

Constant-voltage
power source

GP1A22HR

Constant-voltage
power source

VCC
VOUT
GND

VCC
VOUT
GND

VCC
VOUT
GND

1-173981-2
CN1-1
CN1-2
CN1-3

1-173981-2
CN1-4
CN1-6
CN1-5

1-173981-2
CN1-7
CN1-9
CN1-8

1-173981-2
CN1-10
CN1-12
CN1-11

+5V
DWR
GND

+5V
DLS1
GND

+5V
DLS2
GND

+5V
DED
GND

+5V

+5V

+5V

+5V

+5V

R71

4.7K

R65

4.7K

R76

1.0M

R21
10K

R22
10K

R43
10K

C13

0.010µ F

C17

0.010µ F

C18

0.010µ F

C23

0.010µ F

TP13

R60

4.7K

R35
10K

R36
10K

R38
10K

59

62

63

78

CPU
(IC11)

P73/ANI3

P76/ANI6

P77/ANI7

P27/SI

Tray original size sensor circuit

– 26 –

[f] Original set sensor (DSS)

The DSS uses a photo interrupter which is integrated with a light emitting diode and a photo transistor. The signal is passed through the noise filter
composed of R23, C16, and Schmidt trigger invertor (IC4) to the gate array (IC7 53 pin), then passed through the data bus to the CPU.

+5V

Original set
sensor (DSS)

TLP1240(C5)

VCC
VOUT
GND

CN2-1
CN2-3
CN2-2

173981-9

+5V
DSS
GND

R101

180

R115
15K

R23
10K

C16

0.010µ F

IC4-4

9

TC74HC14AF

8

G/A
(IC7)

53

P0

Original set sensor input circuit

[g] Original width sensor (DWS)

The DWS uses a photo interrupter which is integrated with a light emitting diode and a photo transistor. When there is an original, the lever-type
actuator interrupts the optical path.

The circuit composed of Q12, R100, R29, and R47 is the connector disconnection sense circuit. When the connectors are not disconnected, the
base voltage (5V) of Q12 is divided by R100 and the LED of the photo interrupter to be about 1.2V, conducting the transistor.

At that time, the photo transistor is turned off under "paper empty" state, and the collector current of Q12 flows into R47.
Therefore, the signal DWS turns HIGH by the value (about 4.5V) obtained by dividing +5V with R49 and R47. When in "Paper present," the photo

interrupter turns ON and the collector current of Q12 flows into the photo interrupter. As a result, signal DWS turns LOW.
On the other hand, when a connector is disconnected, the base voltage of Q12 becomes +5V, turning off the transistor. Therefore, signal DWS turns

LOW and it is judged as "Paper present."
Signals are inputted through the noise filter composed of R33 and C21 to the gate array (IC7 54 pin).

+5V

Q12
FN1L3M

R29

15K

R47

150K

R33
10K

TP24

C21

0.010µ F

R34
10K

G/A
(IC7)

54

P1

Original width
sensor DWS

TLP1240(C5)

VCC
VOUT
GND

CN3-7
CN3-9
CN3-8

173981-9

+5V
DMS
GND

R100

180

Original width sensor input circuit

[h] Open/close switch (AUOD, FGOD, TGOD) input circuit (TGOD --- SF-A56 only)

This circuit senses open/close of the ADF unit, the paper feed guide, and the reverse guide, and is connected with three microswitches. Any switch
is closed when its open/close section is closed.

The FGOD directly opens/closes the power to the paper feed motor and the paper feed solenoid. If the FGOD is not closed, the power is not
supplied to the paper feed motor and the paper feed solenoid.

The AUOD and the TGOD are connected in series to +24V, and directly close the power to the drive sections except for the paper feed motor and
the paper feed solenoid. That is, the power is supplied to the drive sections except for the paper feed motor and the paper feed solenoid only when
the two switches (AUOD, TGOD) are closed.

When the paper feed guide open/close switch is turned on, +24V is applied to the cathode of ZD7, supplying the base current to Q8, conducting Q8,
supplying an open/close signal (a close signal in this case) to IC7 57 pin.

Operations in the other open/close switch circuits are the same as above, and each open/close signal is inputted to IC7.
R44 and C40 form a snubber circuit which absorbs an induced voltage generated when the open/close switch is opened during rotation of the DC

motor.

ADF open/close
switch AUOD

Reverse guide
open/close switch
TGOD

Paper feed guide
open/close switch
FGOD

CN30-2
CN30-1

CN31-1
CN31-2

CN29-2
CN29-1

DC+24V
AUOD

AUOD
TGOD

DC+24V
FGOD

DC+24V

DC+24V

CN5-8

AUOD

CN5-7

AUOD

CN7-1

TGOD

CN7-2

CN5-6
CN5-5

DC+24V
FGOD

FD+24V

Open/close switch input circuit

PGND

18V

R44

4.7
C40

47µ F

ZD6

FA1L3N

ZD5

18V

ZD7

18V

+5V

R13

R40
10K

R12
10K

10K

Q7

Q11

FA1L3N

Q8

FA1L3N

G/A
(IC7)

56

P3

55

P2

57

P4

– 27 –

B. Solenoid drive circuit

[a] Paper feed solenoid (DFSOL), reverse solenoid (DRSOL) drive circuit (DRSOL --- SF-A56 only)

This circuit drives the weight plate which presses the bundle of originals on the tray, the paper feed solenoid which drives the paper feed section
shutter, and the reverse solenoid which drives the reverse guide to lead an original to the reverse path when reversing. The basic composition is the
same. The drive signal (ON at HIGH) from the gate array is inputted to the gate of FET (Q14, Q15).

The ON duty of the drive signal can be varied from 0 to 100% (255 steps). The frequency, however, is 20kHz.

G/A
(IC7)

PWM2

D8

SS14

TP28

15

R88

1.0K

Q14
2SK1726

+24V

173981-7

+24V
DRSOL

CN8-4
CN8-5

DRSOL

Reverse
solenoid

PWM1

PGND

SS14

TP36

14

R82

1.0K

PGND

Q15
2SK1282-Z

FD+24V

D7

DF1B-9P-2^5DSA

+24V

CN5-4

DFSOL

CN5-3

DFSOL

Paper feed
solenoid

Solenoid drive circuit

C. Other circuit

[a] EEPROM (IC3) circuit

This circuit serves as a memory to save the sensitivity data of the reflection type sensors, the adjustment values such as the original set position on
the original table, and the counter values such as the number of originals passed. Data communication with the CPU (IC11) is performed with the
3-wire serial interface.

The saved data are maintained even when the power is turned off.
IC3 1 pin is the chip select pin, which is driven to HIGH when data communication is performed.
2 pin is the serial lock pin, and the serial data are transmitted in synchronization with the clock inputted to this pin.
3 pin is the input pin of serial data from the CPU. 4 pin is the output pin of serial data from IC3.
D1, R50, and C1 form a circuit which keeps the power of IC3 at a constant level even when a sudden power drop occurs during data writing.

+5V

D1

R50
10

100µ F

E2ROM+5V

C1

6
7

R49
100K

IC3

ORG
NU

93LC46TSN

DO

*CS

CLK

R4

4

R3

1

R2

2
3

R1

DI

22K
22K
22K
22K

+5V

60
51
52
50

CPU
(IC11)

P74/ANI4
P14
P15
P13

D3

R24
10K

R8

R42
10K

R41
10K

10K

EEPROM circuit

– 28 –

[b] Reset circuit

This circuit generates reset signals for the CPU and the external G/A, and is composed of IC6 and its peripheral circuits.
IC6 is provided with the reset function activated when the power is turned on and when the power falls below +5V.
The reset state is maintained until a certain time passes from when the power voltage reaches about 4.3V after supplying the power. The reset

maintaining time depends on the capacity of C9.
This circuit is also provided with the watch-dog timer function.
The watch-dog timer is built in the G/A (IC7) and is operated when RES2 turns HIGH. It monitors hung-up or other abnormalities of the CPU. RES2

is reset for the watch-dog timer in the G/A, and is separated from the CPU and RES1 of the G/A by D2. Therefore, the CPU reset and the G/A RES1
do not turn HIGH prior to RES2.

For monitoring, data (initial values) are written from the CPU to the G/A once for every 5ms. (Resetting to the initial values every 5ms.) The data are
counted down inside the G/A. Since the values are reset to the initial values every 5ms, the count normally does not fall to zero. If, however, a
hung-up of the CPU occurs, the data are not reset to the initial values, and the counter becomes zero. At that time, resetting is performed from the
G/A to the CPU and the G/A (RES1), and retry is performed until the CPU is resumed.

R30
10K

+5V

65

M51953BFP

R58

4.7K

R9
10K

+5V

Q5
2SC2712

D2

SB02-030

IC5.3

65

HD74LS06FP

TP18

+5V

R9
10K

TP23

C44

0.1µ F

C42

0.1µ F

37

38

39

7

CPU
(IC11)

*RESET

G/A
(IC7)

RES1

WDT

RES2

To main body via
interface cable

DF3-6P-2DSA

RESET

CN9-6

+5V

R61

4.7K
R52

4.7K

1000PF

D6

DSA010

C43

0.1µ F

+5V

7

IC6

C9

0.33µ F

VCC

OUT

C

GND

4

C4

Reset circuit

[c] Paper feed motor (DFM) drive circuit

This circuit controls the paper feed motor rotation and stop and the rotating direction. It is composed of the G/A (IC7) and the exclusive hybrid IC
(IC10), etc.

The motor rotation, stop, and rotating direction are controlled by the combination of binary logics inputted to the G/A through the data bus from the
CPU.

This p rovides contr ol signals to the G /A 65 ∼ 68 pins.
The G/A 65 pin and 66 pin are for the PWM output for speed control. (Normal rotation, 65 pin; reverse rotation, 66 pin)
These signals are inputted to IC10.
IC 10 is a hybrid IC including 4 power MOSFET’s, and drives the motor by taking the G/A output 65 ∼ 68 pins.
The mot or oper ates as follow s by the combination of 25 ∼ 28 pins.

— 65666768
Before start 0 0 0 0
CCW 0 PWM 1 0
CW PWM 0 0 1
Brake 0 0 1 1

In the brake mode, the both terminals of the motor are shorted, generating a great braking torque to stop the motor.

G/A
(IC7)

MIH1

MIL1

MIH2

MIL2

CHGCLK

67
65
68
66
72

C72

0.1µ F

+5V

IC10

4

PG1

OUT1-1
OUT1-2
OUT2-1
OUT2-2

VZ

VCC1-1
VCC1-2

PG2

5

STK681-050

10
11
6
7

2
9

8

72µ H

L2

SK-BMS-5H

72µ H

L1

SK-BMS-5H

FD+24V

C34
1µ F

PGND

C68

0.1µ F

DF1B-9P-2^5DSA

DFW1

CN5-1

DFW2

CN5-2

DFM

Paper feed
motor

4

INA

2

INB

6

INC

3

IND

1

CLK

13

VCC2

16

SG

To power control circuit

Paper feed motor drive circuit

– 29 –

[d] Transport motor (DTM) drive circuit

This circuit controls the transport motor rotation/stop, the rotating direction, and the motor current. It is composed of the CPU (IC11), the constant
current chopper system driver IC (IC8), and the G/A (IC7).

The motor rotating speed and the rotating direction are controlled with the stepping motor drive excitement pattern signals from the CPU (12 ∼ 15
pins).

The PWM (20KHz) signal from the G/A (17 pin) is divided and integrated by R113, bR116, and C39 to be converted into a constant voltage, which is
inputted to IC8 (9 pin, 11 pin) to set the motor current value.

By varying the PWM signal duty, a desired motor current value can be obtained.

[e] Reverse motor (DRM) drive circuit --- SF-A56 only

This circuit controls the reverse motor rotation/stop, the rotating direction, and the motor current, and is composed of the CPU (IC11), the
constant-current chopper system driver IC (IC12), and the G/A (IC7).

The motor rotating speed and the rotating direction are controlled with the stepping motor drive excitement pattern signals from the CPU (16 ∼ 19
pins).

The PWM (20KHz) signal from the G/A (16 pin) is divided and integrated by R112, bR114, and C37 to be converted into a constant voltage, which is
inputted to IC12 (9 pin, 11 pin) to set the motor current value.

By varying the PWM signal duty, a desired motor current value can be obtained.

+5V

+5V

A10
A20
B10
B20

A10
A20
B10
B20

C11

10µ F

2
3
6
7

12

NC

C10

10µ F

2
3
6
7

12

NC

+24V

+24V

C51
100µ F

C53
100µ F

A
*A
B
*B
+24V

+24V

A
*A
B
*B
+24V

+24V

CN7-8
CN7-7
CN7-6
CN7-5
CN7-4

CN7-3

CN4-4
CN4-3
CN4-2
CN4-1
CN4-5

CN4-6

Reverse
motor

DTM

Paper feed
motor

DRM

CPU
(IC11)

P04
P05
O06
P07

P00
P01
P02
P03

G/A
(IC7)

PWM3

PWM4

TP45

16
17
18
19

R112

68K

R11

9.1K

C37

0.1µ F

C33

100PF

TP43TP42

TP44

12
13
14
15

TP22TP33

R113

68K

16

17

R116

20K

C39

0.1µ F

C32

100PF

IC12

13

A1

15

A2

14

B1

16

B2

9

VREF

11

VREF

8

TD1

10

TD2

5

SG

4

PG

STK6712BMK4

PGND PGND

IC8

13

A1

15

A2

14

B1

16

B2

9

VREF

11

VREF

8

TD1

10

TD2

5

SG

4

PG

STK6713BMK4

PGND PGND

Transport motor/reverse motor drive circuit

– 30 –

[f] Paper feed motor (DFM) current limiting circuit

This circuit limits the motor start current to a constant level, and is composed of the resistor for detection of the current value and the voltage
comparator.

The negative voltage side of the paper feed motor is connected to the;pickup resistor composed of R97, R98, and R99, which converts the current
flowing in the driver circuit into a voltage value.

The converted voltage value is compared with the reference voltage by IC9 comparator.
The reference voltage is obtained by dividing the zenor voltage generated from R84 and ZD2 with R39 and R67. It is about 0.3V. When the

converted voltage value exceeds the reference voltage (about 2.8A in the current value), IC9 14 pin turns LOW and the signal is inputted to the G/A
62 pin, interrupting +24V supply to the motor. As a result, the current value is limited.

When the converted value falls below the reference value, +24V is supplied again to resume conduction to the motor.
Since the operating current of this circuit is considerably great,
it operates only when starting the motor and does not operate in the normal state.

G/A
(IC7)

MICUR

IC15-3

TP28

R37
10K

C7
1000PF

R70

10K

8
9

+5V

ZD2
12V

R109

4.7K

FD+24V

PGND

14

µ PC339G2

R84

2.2K

R39
24K

R67
510

TP27

62

From paper feed motor
drive circuit

R97

R98

R99

0.39

0.39

0.39

PGND

Paper feed motor current control circuit

[g] Rush current limiting circuit

This circuit limits a rush current which flows into the current generation capacitors (C53, C54) in the transport motor (DTM)/reverse motor (DRM)
drive circuit, and is composed of the limiting resistor and the FET which allows to flow a constant current.

After closing the ADF open/close switch (AUOD) and the reverse guide open/close switch (TGOD) and until the cathode voltage of ZD3 reaches
16V, the base current is not supplied to Q10, which is kept OFF, driving IC4 3 pin HIGH.

At that time, the base current of Q9 is not supplied to turn off Q9, turning off Q3, flowing a current through R92.
On the other hand, when the cathode voltage of ZD3 exceeds 16V, the base current of Q10 flows to conduct the transistor, turning on Q13. As a

result, the current which was flowing through R92 flows through Q13 to cancel current limiting.
R25 is the discharging resistor which discharges electric charge in C53 and C54 when the ADF open/close switch (AUOD) or the reverse guide

open/close switch (TGOD) is opened.

DC+24V

Power supply
from main body

R105

20K

R83

1.0K

C56

0.22µ F

ZD3

16V

Q10

FA1L3N

+5V

R68

4.7K

Rush current prevention circuit

– 31 –

2SJ265

IC4-6

13

TC74HC14AF

12

R92

4.7
Q13

R106

2.0K

Q9

FA1L3N

+24V

PGND

R25

4.7K

6

5

4

3

Paper feed solenoid

CN5-3

CN5-4

DFSOL

+24V

2

C38

0.1µ F

E2ROM+5V

C25

0.10µ F

AN+24V

C30

0.10µ F

1

AGND

+5V

M1PWM

TP27

INB
IND
INA
INC

CLK

14
13

10K

R28

+5V

10K

R27

0123456

7

17

16

O0O1O2O3O4O5O6

252421

19

8Q

8D

18

9

10K

10KR810K

R41

R42

TP11

3

DI

*CS

CLK

ORG

NU

6

7

100µ F

18

O7

A10

A11

A12

23226

1011121314

+5V+5V

RA2-1

RA1-1

TP10

10K

R24

DFD

93LC46TSN

A13

A14

LE27C256F

27

012

10K

x 8

10K

x 8

TP30

DTD

DSR

1112131415

IC2

*CE

*OEA0A1A2A3A4A5A6A7A8A9

9876543

202210

12

2569121516

1Q2Q3Q4Q5Q6Q7Q

IC1

*OCG1D2D3D4D5D6D7D

TC74HC373AF

111347

8

131417

012345678

10K

CRG10G103J

Display LED

AD (15 ~ 0)

R26

+5V

CN2-7

CN2-8

CN2-9

MDL1

MDL1

GND

CDE FG HI

Q2

FN1L3N1

+5V +5V

Q1

FN1L3N1

B

TP38

R60

DWVR

+5V

D3

47K

C13

0.010µ F

22KR322KR222KR122K

R4

412

DO

IC3

R49

100K

A

E2ROM+5V

CONTROL PWB CIRCUIT DIAGRAM 1 (SF-A17)

D1

+5V

C1

R50

10

60595857565554535150494847464544434241

M1PWM

61

M1CUR

62

NC

63

NC

64

M1L1

65

M1L2

66

M1H1

67

M1H2

68

RD

70

WR

71
72

A0

74

A1

75

A2

76

A3

77

A14

78

A15

79

ROMCS

80

NCNCD0D1D2D3D4D5D6D7XIN

123456789

OSC2

41
42
43

ASTB

44

MODE

46

+5V

47
48

P12

49

P13

50

P14

51

P15

52

P16

53

P17

54
56
57
58
59
60

P75/ANI5

P76/ANI6

61626364656667686970717273747576777879

DTR

DSL1

FD+24V

D7

FGOD

AUOD

DHS

DSS

P7P6P5P4P3P2P1

CHGCLK

3

40393837363534333231302928272625242322

P42/AD2
P41/AD1
P40/AD0

1234567

0

R91

820

CSTS ~ OMGW

GL3PR8

LED1

+5V

67891011121314

4

5

P43/AD3

P44/AD4

P45/AD5

P46/AD6

P47/AD7

P10/PWM0
P11/PWM1

P0

S2B

S2A

S2Q

TCLK

TESTI1

TESTI0

BORROW

IC7

LSI-LC93043A-V54

XOUT

PWM1

PWM2

PWM3

1011121415161718192021

DFMPWM

R90

1.0M

R121

1.5K

15

P50/A8

P51/A9

P52/A10

P53/A11

P54/A12

P55/A13

P56/A14

NC

NC

S1B

S1Q

PWM4

PWM5

PWM6

PWM7

PWM8

FANPWM

P57/A15

P60/A16

P61/A17

P62/A18

P63/A19

IC11

ANO1

AVREF2

AVREF3

TP8

P20/NMI

P21/INTP0

DTDSEN

µ PD78233GC-3B9

P22/INTP1

DFDSEN

DFMRS

P23/INTP2/CI

P24/INTP3

P25/INTP4/ASCK

P26/INTP5

P27/SI

P30/RXD

DES

DLS3

TXD

P70/ANI0
P71/ANI1
P72/ANI2
P73/ANI3
P74/ANI4

P77/ANI7

AVDD

AVREF1

AVSS

ANO0

+5V

TP7

DSL2

TP9

DTDLED

DFDLED

SS14

S1A
RES2
WDT
RES1
M2CLKB
M2CLKA
M2CLK0
M2DIR
M2CUR
M2PWM
M2H2
M2H1
M2L2
M2L1
NC
NC

80

RXD

+5V

C59

1.0µ F

HD1A3M

CST9 ~

83MTW

109876

12345

SW1-1

SW1-2

SW1-3

PGND

C62

C48 C41

C47

C36

C51

C35

C52

C61

C60

C45

C58

C10

+5V

3

PSW1

1

SW1-5

1.0µ F

1.0µ F 1.0µ F

0.1µ F

0.1µ F

1.0µ F

0.1µ F

1.0µ F

1.0µ F

1.0µ F

1.0µ F

1.0µ F

10µ F

236

A10

A1A2B1B2VREF

IC8

131514

TP44

4

SKHHPK

2

Transport motor

+24V

7

A20

B10

B20

VREF

16911810

TP22TP33

R113

DFMPWM

13

IC9-4

µ PC339G2

10

11

8

HD74LS06FP

IC5-4

9

68K

CN4-5*BCN4-1BCN4-2*ACN4-3ACN4-4

+24V

IC5-6

CN4-6

+24V

TD1

TD2SGPG

C39

0.1µ F

AGND

12

13

R116

5

HD74LS06FP

C53

4

20K

EFGHI

100µ F

PGND

12

NC

STK6713BMK4

PGND

C32

100PF

CD

B

10

HD74LS06FP

IC5-5

11

A

Q15

2SK1282-Z

PGND

C24

0.1µ F

40
39
38
37
36
35
34
33
32
30
28
27
26
25
24
23

TP36

21

P64/RD

P65/WR

P66/*WAIT

P31/TXD

TP23

R9

10K

+5V

IC5.3

65

HD74LS06FP

D2

R82

1.0K

RESET

CN7-1

CN7-2

+24V

A

+24V

ZD4

24V

D4

S1G

P67/*REFRQ

20

PO7

19

PO6

18

PO5

17

PO4

16

PO3

15

PO2

14

PO1

13

PO0

12

X1

10

X2

9

*RESET

7

P37/TO3

6

P36/TO2

5

P35/TO1

4

P34/TO0

3

P33/SO/SB0

2

P32/*SCK

1

SB02-030

R5

10K

+5V

6

M51953BFP

OUT

4

7

+5V

VCC

GND

C

IC6

5

C9

0.33µ F

C4

1000PF

CN7-6

CN7-4

CN7-5

+24V

B

*B

+24V

ZD5

24V

CN7-3

*A

D5

S1G

Q17

RESET

S1G

D11

Q14

D8

S1G

Q6

HD1A3M

Q17

HD1A3M

HD1A3M

PGND

TP45

OSC1

[10] CIRCUIT DIAGRAM

6

5

4

3

2

1

– 32 –

6

Paper feed

motor

CN5-2

DFW1 CN5-1

DFW2

72µ H

72µ H

L1

SK-BMS-5H

L2

SK-BMS-5H

101167298

OUT1-1

OUT1-2

OUT2-1

OUT2-2VZVCC1-1

IC10

INA

INB

INC

IND

42631

DMA

DMB

DMC

DMD

CLK

5

R97

TP26

C68

0.1µ F

FD+24V

C34

CLK

VCC2

13

+5V

PGND

1µ F

STK681-050

PG2

5

VCC1-2

PG1

4

SG

16

C72

0.1µ F

0.39
PGND

R98

0.39

R99

0.39

10K

R70

C7

1000PF

TP28

8

9

R84

2.2K

R39

FD+24V

IC15-3

µ PC339G2

14

R109

4.7K

+5V

MRCUR

4

R105

20K

R110

14.7K

+5V

R37

10K

24K

R67

510

ZD2

12V

Q7

PGND

+24V

FA1L3N

TP39

Q13

ZD3

16V

R6

4.7

3

TP40

+5V

R12

AUOD

TP40

+5V

R11

10K

IC12-6

TC74HC14AF

13

12

C56

0.22µ F
Q8

R7

4.7K
PGND

2.0K

R106

2SJ265

R85

1.0K

C8

1000PF

Q10

FA1L3N

PGND

DC+24V

NC

CN5-9

2

FGOD

10K

Q9

FA1L3N

1

Fan motor

CN8-1

FA1L3N

ZD6

18V

ZD7

18V

C11

R92

4.7

FD+24V

DC+24V

AUOD

DC+24V

FCOD

CN5-8

CN5-7

CN5-6

CN5-5

CN8-2

FAN

+24V

DC+24V

D10

S1G

Q16

RN1427

PGND

47µ F

PGND

R83

1.0K

TP34

C29

0.10µ F

FANPWM

AN+24V

R118

DC+24V

AGND

C57

4.7µ F

10

DLS1

DWMR

R35

10K

CDE FG HI

+5V

B

C17

10K

R21

R71

4.7K

+5V

+5V

ADF open/close

switch

Paper feed guide

open/close switch

EFGHI

TXD

3300PF

RES

65

IC4-1

TC74HC14AF

IC4-3

C15

0.010µ F

10K

R25

R77

R117

15K

+5V

R102

R61

4.7K

+5V

180

R59

4.7K

R57

4.7K

DTDSEN

IC13-2

5

Q4

C6

1

R87

2SC2712

AN+24V

DFDSEN

TP12

R54

4.7K

+5V

1000PF

100

R93

6

µ PC358G2

10K

1

IC9-2

R46

100K

7

R79

22K

DTDSEN

DFDSEN

R53

4.7K

+5V

C5

1000PF

100

R94

3

DLS2

R36

10K

C18

0.010µ F

0.010µ F

R22

10K

R76

R65

4.7K
+5V

DSS

DLS3

8

R38

10K

TC74HC14AF

IC4-4

9

C23

0.010µ F

C16

R43

10K

R23

10K

R115

15K

+5V

1.0M

180

R101

DWS

R34

TP24

R33

0.010µ F

15K

R29

Q12

FN1L3M

+5V

180

R100

2

IC13-1

1

10K

R86

C21

0.010µ F

Q3

2SC2712

10K

R47

150K

AN+24V

+5V

DTD

µ PC358G2

10K

2

µ PC339G2

IC9-1

R45

100K

5

4

R80

2.0K

R78

22K

AGND

C19

0.10µ F

10K

R10

R95

2.0K
AGND

+5V

DFMRS

TP13

10

DFD

IC4-5

11

TC74HC14AF

µ PC339G2

6

R11

C24

R55

4.7K

R81

2.0K
AGND

C14

0.10µ F

10K

R56

4.7K

+5V

R66

4.7K
AGND

+5V

DTR

RXD

21

TC74HC14AF

C2

1000PF

4.7K
12

IC5-1

DSR

RESET

C44

43

TC74HC14AF

IC4-2

C3

1000PF

34

HD74LS06FP

IC5-2

R51

4.7K

C50

0.1µ F

+5V

C55

47µ F

ZD1

6.2V

15V

TP2

TP1

0.1µ F

TP18

Q5

+5V

2SC2712

R58

4.7K

HD74LS06FP

10K

R30

D6

DSA010

C43

0.1µ F

R52

4.7K

CD

D9

S1G

+5V

C12

0.010µ F

DC+24V

C31

47µ F

AGND

TP3

TP4

B

PGND

TXD

RXDCN9-3

BTR

BSR

RESET

GND

+5V

DFMRS

+5V

DED

GND

+5V

DSS

+5VCN1-7

DLS2

+5V

+5V

DWR

GND

GP1A25LC

CN1-4

CN1-1

CN1-2

CN1-3

A

CONTROL PWB CIRCUIT DIAGRAM 2 (SF-A17)

Tray original

width VR

Original length

GNDCN1-8

DLS1CN1-6

GNDCN1-5

GP1A25LC

GP1A25LC

CN1-10

CN1-12

CN1-9

sensor 1

Third sheet

Original length

sensor 2

6

GND

+5V

TLP1240

CN1-11

sensor

TLP1240

CN2-1

CN2-3

CN2-2

CN3-7

Original set

sensor

5

+5v

GND

CN3-8NCCN3-10

DTDLED

CN3-1

CN3-3

sensor

DMS

CN3-9

Original width

DTD

CN3-2

Original timing

sensor

4

+5v

DFDLED

CN3-4

CN3-6

Original feed

DFD

CN3-5

sensor

3

GND

+5v

TLP1225

CN2-6

CN2-5

CN2-4

Paper feed motor

rotation sensor

+5V

RES

GND

TLP1240

CN8-3

CN9-2

CN9-4

CN8-4

CN8-5

Paper exit

sensor

CN9-5

Communication

signal line

2

GND

DC+24V

PGND

CN9-6

CN9-1

CN6-3

CN6-4

CN6-1

CN6-2

Power supply

A

1

– 33 –

CONTROL PWB (SF-A17)

LED PWB SENSOR PWB

– 34 –

6

DFM

(118) RD

(119) BE

CN36-1

CN36-2

DFM2

DFM1

CN35-1

CN35-2

RD (112)

BE (113)

5

DFSOL

MM4565A05

Paper feed motor

TDS-10SL-102

Paper feed solenoid

(120) RD

(121) RD

CN38-1

CN38-2

DFSOL

FD+24V

CN42-1

CN42-2

LB (123)

LB (122)

ASM-SOL

(122) LB

(123) LB

CN41-1

CN41-2

DFSOL

FD+24V

CN37-1

CN37-2

LB (114)

OE (115)

(104) RD

(105) BE

(106) OE

(107) LB

(108) OE

(109) BN

CN34-1

CN34-2

CN34-3

CN34-4

CN34-5

CN34-6

DFM1

DFM2

DFSOL

FD+24V

FGOD

DC+24V

CN33-1

CN33-2

CN33-3

CN33-4

CN33-5

CN33-6

RD (104)

BE (105)

OE (106)

LB (107)

OE (108)

BN (109)

4

AUOD

SS-5T

FGOD

Paper feed

guide switch

FGOD

DC+24V

CN39-1

CN39-2

OE (116)

BN (117)

ASM-drive

SS-5T

ADF open/close

switch

AUOD

DC+24V

CN40-1

CN40-2

BE (110)

BK (111)

3

DES

TLP1240(CS)

+5V

GND

DES

Paper exit sensor

CN32-3

CN32-2

CN32-1

(96)

(97)

(98)

BK

(94)

ASM-grounding pin 15

BK

BK

(94) (95)

ASM-RU

2

NC

DC+24V

TXD

FGND

RXD

+5V

DSR

RESET

GND

PGND

DTR

CN31-1NCCN31-2

CN31-3

CN31-4

CN31-5

CN31-6

CN31-7

CN31-8

CN31-9

CN31-10

CN31-11

CN31-12

OE (84)

VT (88)

GY/YW (93)

BN (89)

RD (86)

PK (91)

LB (92)

GY (87)

BE (85)

YE (90)

BK

(95)

ASM-IF

(93)

1

ASM-drive I/F

(104) RD

(105) BE

(106) OE

(107) LB

(108) OE

(109) BN

(110) BE

(111) BN

CN5-1

CN5-2

CN5-3

CN5-4

CN5-5

CN5-6

CN5-7

CN5-8NCCN5-9

DFM1

DFM2

DFSOL

FD+24V

FGOD

DC+24V

AUOD

DC+24V

+5V

DWVR

GND

+5V

GND

DLS1

+5V

GND

DLS2

+5V

CN1-1

CN1-2

CN1-3

CN1-4

CN1-5

CN1-6

CN1-7

CN1-8

CN1-9

CN1-10

LB (1)

LB (2)

LB (3)

LB (4)

LB (5)

LB (6)

LB (7)

LB (8)

LB (9)

LB (10)

LB (11)

(1) LB

(2) LB

(3) LB

(4) LB

(5) LB

(6) LB

(7) LB

(8) LB

(9) LB

(10) LB

(11) LB

CN10-12

CN10-11

CN10-10

CN10-9

CN10-8

CN10-7

CN10-6

CN10-5

CN10-4

CN10-3

+5V

DWVR

GNDCN11-3

+5V

GND

DLS1CN11-6

+5V

GND

DLS2CN11-9

+5V

CN11-1

CN11-2

CN11-4

CN11-5

CN11-7

CN11-8

CN11-10

LB (13)

LB (14)

LB (15)

LB (16)

LB (17)

LB (18)

LB (19)

LB (20)

LB (21)

LB (22)

LB (23)

(13) LB

(14) LB

(15) LB

(16) LB

(17) LB

(18) LB

(19) LB

(20) LB

(21) LB

(22) LB

CDE FG HI

CN12-12

CN12-11

CN12-10

CN12-9

+5VCN13-1

DWVR

GND

+5V

CN13-2

CN13-3

CN13-4

LB (25)

LB (26)

LB (27)

LB (28)

(25) LB

(26) LB

B

A

WIRING SYSTEMATIC DIAGRAM (SF-A17)

6

(27) LB

CN14-3

CN14-2

CN14-1

+5VCN15-1

DWVR

GND

CN15-2

CN15-3

LB (37)

LB (38

LB (39)

(28) LB

(29) LB

ASM-VR

(37) LB

(38) LB

DWVR

(30) LB

CN16-1

CN16-2

(39) LB

CN16-3

+5V

GND

DLS1

DLS1

GP1A25LC

Original length sensor 1

Original width sensor

5

(23) LB

CN12-8

CN12-7

CN12-6

CN12-5

CN12-4

CN12-3

GND

DLS1

+5V

GND

DLS2

+5V

CN13-5

CN13-6

CN13-7

CN13-8

CN13-9

CN13-10

LB (29)

LB (30)

LB (31)

LB (32)

LB (33)

LB (34)

LB (35)

ASM-TRAY ASM-TR2 ASM-TR1

(31) LB

(32) LB

(33) LB

CN17-1

CN17-2

CN17-3

+5V

GND

DLS2

DLS2

GP1A25LC

Original length sensor 2

(96) LB

(97) LB

(98) LB

CN8-1

CN8-2

CN8-3

CN8-4

CN8-5

DC+24V

FAN

+5V

GND

DES

(PWB-C)

PBA-CONTROL

GND

DED

CN1-11

CN1-12

LB (12)

(12) LB

CN10-2

CN10-1

GND

DEDCN11-12

CN11-11

LB (24)

(24) LB

CN12-2

CN12-1

GND

DED

CN13-11

CN13-12

LB (36)

(34) LB

(35) LB

(35) LB

CN18-1

CN18-2

CN18-3

+5V

GND

DED

DED

GP1A22HR

+5V

GND

DSS

GND

DFMRS

+5V

MDL1

MDL2

GND

CN2-1

CN2-2

CN2-3

CN2-4

CN2-5

CN2-6

CN2-7

CN2-8

CN2-9

LB (40)

LB (41)

LB (42)

LB (43)

LB (44)

LB (45)

LB (46)

LB (47)

LB (48)

ASM-SNR

(40) LB

(41) LB

(42) LB

(43) LB

(44) LB

(46) LB

(47) LB

(48) LB

CN19-3

CN19-2

CN19-1

MDL1

MDL2

GND

CN20-1

CN20-2

CN20-3

LB (49)

LB (50)

LB (51)

ASM-LED

(49) LB

(50) WE

(51) YW

CN21-3

CN21-2

CN21-1

MDL1

MDL2

GND

(PWB-D)

PBA-LED

Original end sensor

Display LED

(45) LB

CN22-6

CN22-5

CN22-4

CN22-3

CN22-2

CN22-1

+5VCN23-1

GND

DSS

+5V

DFMRS

+5V

CN23-2

CN23-3

CN23-4

CN23-5

CN23-6

LB (52)

LB (53)

LB (54)

LB (55)

LB (56)

LB (57)

ASM-sensor 1

(52) LB

(53) LB

(54) LB

(55) LB

(56) LB

(57) LB

CN24-3

CN24-2

CN24-1

CN25-3

CN25-2

CN25-1

+5V

GND

DSS

GND

DFMRS

+5V

DSS

DFMRS

TLP1240(C5)

TLP1225(C5)

Paper feed motor rotation sensor

Original set sensor

4

+5V

DTD

DTDLED

+5V

CN13-1

CN13-2

CN13-3

CN13-4

LB (60)

LB (61)

LB (62)

LB (63)

(60) LB

(61) LB

(62) LB

(63) LB

CN26-9

CN26-8

CN26-7

CN26-6

+5VCN27-1

DTD

DTDLED

+5V

CN27-2

CN27-3

CN27-4

LB (69)

LB (70)

LB (71)

BK

(58)

BK BK

ASM-grounding pin

(58) (59)

LB (72)

BK

(59)

(69) LB

(70) LB

(71) LB

(72) LB

CN28-1

CN28-3

CN28-2

+5V

DTD

DTDLED

DTD

PBA-SENSOR

-2214

Original timing sensor

3

(88) VT

(89) BN

(90) YW

(91) PK

(92) LB

(84) OE

(85) BE

(86) RD

(87) GY

CN9-1

CN9-2

CN9-3

CN9-4

CN9-5

CN9-6

CN6-1

CN6-2

CN6-3

CN6-4

GND

TXD

RXD

DTR

DSR

RESET

DC+24V

PGND

+5V

GND

*B

+24V

CN14-1BCN14-2*ACN14-3ACN14-4

(78)

(79)

+24V

CN14-5

CN14-6

(80)

(81)

(82)

(83)

DFD

DFDLED

+5V

GND

DWS

NC

CN13-5

CN13-6

CN13-7

CN13-8

CN13-9

CN13-10

LB (64)

LB (65)

LB (66)

LB (67)

LB (68)

EFGHI

ASM-sensor I/F

(64) LB

(65) LB

(66) LB

(67) LB

(68) LB

CN26-5

CN26-4

CN26-3

CN26-2

CN26-1

DFD

DFDLED

+5V

GND

DWS

CN27-5

CN27-6

CN27-7

CN27-8

CN27-9

LB (73)

LB (74)

LB (75)

LB (76)

LB (77)

ASM-sensor 2

DTM

103H7124-1141

Current (belt) motor

(73) LB

(74) LB

(75) LB

(76) LB

(77) LB

CN29-3

CN29-2

CN29-1

CN30-3

CN30-2

CN30-1

+5V

DFD

DFDLED

+5V

GND

DWS

DFD

DWS

PBA-SENSOR

-2214

TLP1241N(CS)

Original feed sensor

Original width sensor

2

1

CD

B

A

– 35 –

6

CN5-1

CN5-2

DFM1

DFM2

Paper feed motor

FD+24V

72µ HL272µ H
L1

101167298

OUT1-1

OUT1-2

IC10

INA

INB

42631

Display LED

SK-BMS-5H

SK-BMS-5H

OUT2-1

OUT2-2VZVCC1-1

INC

IND

CLK

+5V

14
13

IC2

202210

12

IC1

*OCG1D2D3D4D5D6D7D

TC74HC373AF

111347

AD (15 ~ 0)

R26

10K

+5V

CN2-7

CN2-8

CN2-9

MDL1

MDL1

SGND

C34

1µ F

VCC1-2

VCC2

SG

13

16

C49

*CE

*OEA0A1A2A3A4A5A6A7A8A9

9876543

2569121516

1Q2Q3Q4Q5Q6Q7Q

012345678

CRG10G103J

CDE FG HI

Q2

FN1L3N1

+5V +5V

Q1

FN1L3N1

B

SB02-030

+5V

D3

22KR322KR222KR122K

R4

412

IC3

R49

100K

A

E2ROM+5V

CONTROL PWB CIRCUIT DIAGRAM 1 (SF-A56)

D1

+5V

C1

R50

10

C28

0.1µ F

STK681-050

PG2

5

PG1

4

0.1µ F

0123456

1112131415

O0O1O2O3O4O5O6

8

131417

10K

10KR810K

R41

R42

SK

DO

*CS

ORG

6

100µ F

19

8Q

8D

18

3

7

5

PGND

16

252421

9

1011121314

TP11

DI

TEST

R99

0.39

R98

0.39

R97

0.39

10K

R20

C7

1000PF

TP40

8

9

IC9-3

FD+24V

14

µ PC339G2

R62

4.7K

+5V

+5V

TP27

61
62

NC

63

NC

64

M1L1

65

M1L2

66

M1H1

67

M1H2

68

RD

70

WR

71
72

A0

74

A1

75

A2

76

A3

77

A14

78

A15

79
80

10K

R28

+5V

10K

R27

7

17

18

O7

A10

A11

A13

A14

A12

LE27C256F

23226

27

012

+5V+5V

RA2-1

10K

x 8

RA1-1

10K

x 8

TP30

TP10

TP16

10K

R24

RDD

RDDLED

DFD

DTD

DSR

LE93C46M1

123456789

OSC2

41
42
43

ASTB

44

MODE

46

+5V

47
48

P12

49

P13

50

P14

51

P15

52

P16

53

P17

54
56
57
58
59
60

P75/ANI5

61626364656667686970717273747576777879

DTR

DSL1

DWVR

4

PGND

R37

10K

R84

2.2K

R39

24K

R67

750

PGND

ZD2

12V

FGOD

AUOD

DHS

DSS

TGOD

60595857565554535150494847464544434241

P7P6P5P4P3P2P1

M1PWM

M1CUR

CHGCLK

ROMCS

NCNCD0D1D2D3D4D5D6D7XIN

+5V

3

40393837363534333231302928272625242322

P43/AD3

P42/AD2
P41/AD1
P40/AD0

P10/PWM0
P11/PWM1

P70/ANI0
P71/ANI1
P72/ANI2
P73/ANI3
P74/ANI4

P76/ANI6

P77/ANI7

DSL2

IC7

1234567

0

R91

820

CSTS ~ OMGW

GL3PR8

LED1

67891011121314

4

5

P50/A8

P44/AD4

P45/AD5

P46/AD6

P47/AD7

AVDD

AVREF1

AVSS

ANO0

ANO1

+5V

DTDDA

DFDDA

P0

S2B

S2A

S2Q

S1Q

TCLK

TESTI1

TESTI0

BORROW

LSI-LC93043A-V54

XOUT

PWM1

PWM2

PWM3

PWM4

1011121415161718192021

R90

1.0M

R89

1.5K

P51/A9

P52/A10

PWM5

DFMPWM

RDDPWM

DRMPWM

15

P53/A11

P54/A12

P55/A13

P56/A14

P57/A15

IC11

µ PD78233GC-3B9

AVREF2

AVREF3

P20/NMI

P21/INTP0

P22/INTP1

P23/INTP2/CI

P24/INTP3

RDDOUT

DFDOUT

DFMRS

DTDOUT

NC

NC

S1B

PWM6

PWM7

FANPWM

P60/A16

P61/A17

P62/A18

P25/INTP4/ASCK

P26/INTP5

P27/SI

DLS3

3

Reverse solenoid

Paper feed solenoid

8

CN8-5

CN5-4

CN5-3

CN5-4

DRSOL

+24V

DFSOL

+24V

+24V

FD+24V

Q15

2SK1282-Z

D7

D8

SS14

SS14

Q14

2SK1282-Z

PGND

C42

0.1µ F

S1A

40

RES2

39

WDT

38

RES1

37

M2CLKB

36

M2CLKA

35

M2CLK0

34

M2DIR

33

M2CUR

32

M2PWM

30

M2H2

28

M2H1

27

M2L2

26

R88

R82

M2L1
NC
NC

PWM8

1.0K

25
24
23

TP28

TP36

2

PGND

TP23

R9

10K

+5V

IC5.3

65

HD74LS06FP

D2

1.0K

RESET

SB02-030

R5

10K

+5V

6

M51953BFP

OUT

4

7

+5V

VCC

GND

C

IC6

5

C9

0.33µ F

C4

1000PF

Reverse motor

CN7-3

CN7-4*BCN7-5BCN7-6*ACN7-7ACN7-8

+24V

+24V

C54

100µ F

RXD

10µ F

C11

236

+5V

IC12

131514

TP45

21

P64/RD

P65/WR

P63/A19

P66/*WAIT

P67/*REFRQ

20

PO7

19

PO6

18

PO5

17

PO4

16

PO3

15

PO2

14

PO1

13

PO0

12

X1

10

X2

9

*RESET

7

P37/TO3

6

P36/TO2

5

P35/TO1

4

P34/TO0

3

P33/SO/SB0

2

P32/*SCK

1

P30/RXD

P31/TXD

80

TXD

+24V

7

A10

A20

B10

B20

A1A2B1B2VREF

VREF

16911810

TP43TP42

R112

DRMPWM

OSC1

RESET

TD1

68K

TD2SGPG

C37

0.1µ F

12

NC

5

4

C33

100PF

9.1K

R114

CST9 ~

109876

12345

SW1-1

SW1-2

PGND

C10

+5V

STK6713BMK4

PGND

83MTW

PSW1

SW1-3

SW1-5

SW1-4

10µ F

236

A10

A1A2B1B2VREF

IC8

131514

TP44

3

4

SKHHPK

1

2

Transport motor

+24V

7

A20

B10

B20

VREF

16911810

TP22TP33

R113

DFMPWM

1

68K

CN4-5*BCN4-1BCN4-2*ACN4-3ACN4-4

+24V

TD1

C39

CN4-6

+24V

C53

TD2SGPG

5

0.1µ F

20K

R116

100µ F

12

NC

4

C32

100PF

EFGHI

PGND

STK6713BMK4

PGND

CD

B

A

6

5

4

3

2

1

– 36 –

6

5

4

3

2

1

FGOD

C40

TXD

DTR

RXD

21

TC74HC14AF

IC4-1

C2

1000PF

R77

4.7K
12

IC5-1

R61

4.7K

+5V

R59

4.7K

R57

4.7K

TXD

RXDCN9-3

BTR

BSR

CN9-2

CN9-4

CN9-5

Communication

signal line

IC4-2

HD74LS06FP

+5V

RESET

CN9-6

43

R51

+5V

SGND

CN9-1

DSR

RESET

C44

0.1µ F

TC74HC14AF

TP18

Q5

+5V

C3

1000PF

34

IC5-2

4.7K

C50

0.1µ F

C55

47µ F

ZD1

6.2V

GND

+5V

SGND

CN6-3

CN6-4

2SC2712

R58

4.7K

HD74LS06FP

AGND

DC+24V

10K

R30

D6

DSA010

C43

0.1µ F
R68

14.7K

4.7K

0.010µ F

47µ F

PGND

CN6-2

+5V

PGND

R52

D9

S1G

+5V

C12

DC+24V

C31

PGND

DC+24V

CN6-1

Power supply

47µ F

R44

4.7K

FD+24V

R25

+5V

R105

Q10

ZD3

PGND

4.7K
PGND

+5V

IC4-6

20K

FA1L3N

16V

R92

TC74HC14AF

13

12

C56

0.22µ F

+24V

Q13

4.7

Q9

2.0K

R106

2SJ265

R83

1.0K

C8

1000PF

TGOD

AUOD

CN7-2

CN7-1

Reverse guide

open/close switch

+5V

R10

10K

Q8

AUOD

FA1L3N

+5V

R13

10K

Q7

TGOD

R40

10K

FA1L3N

Q11

PGND

ZD5

FA1L3N

FA1L3N

Fan motor

ZD7

18V

CN8-6

ZD6

18V

18V

FD+24V

DC+24V

NC

DC+24V

AUOD

DC+24V

FGOD

CN5-9

CN5-8

CN5-7

CN5-6

CN5-5

ADF open/close

switch

Paper feed guide

open/close switch

CN8-7

FAN

DC+24V

DC+24V

D10

S1G

Q16

RN1427

PGND

R85

1.0K

TP48

FANPWM

E2ROM+5V

AN+24V

+5V

C38

0.1µ F

AGND

C26

0.10µ F

C25

0.10µ F

C30

0.10µ F

C62

1.0µ F

C41

1.0µ F

C48 C61

1.0µ F 1.0µ F

C47

0.1µ F

C36

0.1µ F

C51

1.0µ F

C35

0.1µ F

C52

1.0µ F

C60

1.0µ F

C59

1.0µ F

C45

1.0µ F

C58

1.0µ F

EFGHI

7

IC14-2

6

5

DLS1

DWMR

TP38

R35

R60

CDE FG HI

4.7K

C13

0.010µ F

R21

R71

4.7K

+5V

B

+5V

+5V

DLS1CN1-6

+5V

DWR

SGND

GP1A25LC

CN1-4

CN1-1

CN1-2

CN1-3

A

CONTROL PWB CIRCUIT DIAGRAM 2 (SF-A56)

Tray original

width VR

Original length

6

4.7K

SGND

CN2-4

C24

TC74HC14AF

3300PF

RDD

R64

D4

SB02-03Q

+5V

R70

R74

TP50

+5V

AN+24v

CN8-1

RDD

CN8-2

Reverse sensor

RDDLED

10K

C15

0.10µ F
AGND

10K

R63

1.5K
AGND

3.0K
R32

10K

Q17

R107

R108

RDDLED

CN8-3

FA1L3M

2.2K

2.2K
AGND

AN+24V

DC+24V

AGND

C29

0.10µ F

C57

4.7µ F

10

R118

2

RDDOUT

TP14

R73

4.7K

+5V

13

R48

µ PC339G2

100K

IC9-4

10

11

C20

0.10µ F
AGND

TP47

R72

4.7K

1

C22

0.010µ F

µ PC358G2

IC14-1

R7

10K

2

3

R6

10K

C46

0.10µ F

AGND

R31

4.7K

RDDPWM

CD

B

AGND

AGND

A

1

DTFDA

DTDDA

6

8

12

HD74LS06FP

IC4-3

µ PC58G2

AGND

DLS2

R36

10K

10K

C18

C17

0.010µ F

10K

R22

10K

R65

4.7K

+5V

+5V

+5VCN1-7

DLS2

SGNDCN1-8

SGNDCN1-5

GP1A25LC

CN1-9

sensor 1

Original length

sensor 2

HD74LS06FP

IC5-4

5

9

DLS3

R38

10K

C23

0.010µ F

0.010µ F

R43

10K

R115

+5V

R76

1.0M

180

R101

+5V

DED

SGND

TLP1240

GP1A25LC

CN1-10

CN1-12

CN1-11

Third sheet

sensor

10

HD74LS06FP

IC5-6

IC5-5

13

11

DSS

8

TC74HC14AF

IC4-4

9

C16

0.010µ F

R23

10K

Q12

FN1L3M

15K

+5V

180

R100

+5V

DSS

SGND

TLP1240

CN2-1

CN2-3

CN2-2

Original set

sensor

TP7

HD74LS06FP

DWS

10K

R34

TP24

C21

0.010µ F

R33

10K

R47

150K

15K

R29

+5V

DMS

CN3-9

Original width

SGND

CN3-8NCCN3-10

sensor

+5v

CN3-1

+5V

CN3-7

5

DTDOUT

TP8

R53

4.7K

+5V

C5

1000PF

100

R94

3

2

IC13-1

1

µ PC358G2

R86

10K

Q3

2

2SC2712

IC9-1

R45

100K

5

4

R78

22K

AN+24V

R10

DTDLED

CN3-3

Original timing

sensor

DTD

CN3-2

TP9

DTD

µ PC339G2

R80

2.0K
AGND

C19

0.10µ F

10K

R95

2.0K

AGND

+5V

+5v

CN3-4

4

DFDOUT

TP12

R54

4.7K

+5V

C6

1000PF

100

R93

5

6

IC13-2

1

µ PC358G2

R87

10K

Q4

1

2SC2712

IC9-2

R46

100K

7

R79

22K

AN+24V

DFDLED

CN3-6

Original feed

sensor

3

DFMRS

TP13

10

DFD

IC4-5

11

µ PC339G2

6

R55

R81

2.0K
AGND

C14

0.10µ F

R11

10K

R56

4.7K

+5V

R66

4.7K

AGND

+5V

+5v

DFMRS

DFD

TLP1225

CN2-6

CN2-5

CN3-5

Paper feed motor

rotation sensor

– 37 –

CONTROL PWB (SF-A56)

LED PWB SENSOR PWB

– 38 –

6

DFM

MM4565A05

Paper feed motor

(96) RD

(97) BE

CN26-1

CN26-2

DFM2

DFM1

CN25-1

CN25-2

RD (90)

BE (91)

(90) RD

(91) BE

CN24-1

DFM1

CN23-1

RD (82)

BE (83)

5

AUOD

SS-5T

DFSOL

RD

RD

(135) RD

(136) RD

CN41-1

CN41-2

FD+24V

DFSOL

CN40-1

CN40-2

LB (98)

OE (99)

ASM-SOL

(98) LB

(99) OE

CN28-1

CN28-2

DFSOL

FD+24V

CN27-1

CN27-2

LB (92)

OE (93)

(92) LB

(93) OE

CN24-2

CN24-3

CN24-4

DFM2

DFSOL

FD+24V

CN23-2

CN23-3

CN23-4

LB (84)

OE (85)

FGOD

TDS-10SL-102

Paper feed solenoid

FGOD

DC+24V

CN29-1

CN29-2

OE (94)

BN (95)

ASM-drive

(94) BN

(95) OE

CN24-5

CN24-6

FGOD

DC+24V

CN23-5

CN23-6

BN (86)

OE (87)

SS-5T

Paper feed

guide switch

AUOD

DC+24V

CN30-1

CN30-2

BE (88)

BK (89)

ASM-drive I/F

4

TGOD

ADF open/close

switch

AUOD

TGOD

CN31-1

CN31-2

BK (100)

OE (101)

DRM

Reverse guide switch

(110) BE

(111) GN

(108) WE

(109) BK

(112) YW

(113) RD

CN33-1

CN33-2

CN33-3

CN33-4

CN33-3*BCN33-4

+24V

+24V

A

*A

B

CN32-2

CN32-4

CN32-5

CN32-6

CN32-3

CN32-1

BE (104)

GN (105)

BK (103)

WE (102)

RD (107)

YW (106)

ASM-Drive R

3

RDD

Reverse motor

AN+24V

RDD

CN34-3

CN34-2

LB (115)

LB (116)

LB (117)

DRSOL

TDS-10SL-102

Reverse sensor

RDDLED

CN34-1

ASM-RU

Reverse solenoid

RD

RD

(123) RD

(124) RD

CN38-1

CN38-2

DRSOL

+24V

CN37-2

CN37-1

LB (118)

LB (119)

2

NC

DC+24V

TXD

FGND

RXDCN39-6

+5V

DSR

RESET

SGND

PGND

DTR

CN39-1NCCN39-2

CN39-3

CN39-4

CN39-5

CN39-7

CN39-8

CN39-9

CN39-10

CN39-11

CN39-12

I/F cable

OE (130)

VT (125)

GN/YW(134)

BN (126)

RD (132)

PK (128)

LB (129)

GY (133)

BE (121)

YE (122)

ASM-IF

GN/YW

FGND

(134)

1

(82) RD

(83) BE

(84) LB

(85) OE

(86) BN

(87) OE

(88) BK

(89) BE

CN5-1

CN5-2

CN5-3

CN5-4

CN5-5

CN5-6

CN5-7

CN5-8NCCN5-9

DFM1

DFM2

DFSOL

FD+24V

FGOD

DC+24V

AUOD

DC+24V

+5V

DWVR

SGND

+5V

SGND

DLS1CN1-6

+5V

SGND

DLS2

+5V

CN1-1

CN1-2

CN1-3

CN1-4

CN1-5

CN1-7

CN1-8

CN1-9

CN1-10

LB (1)

LB (2)

LB (3)

LB (4)

LB (5)

LB (6)

LB (7)

LB (8)

LB (9)

LB (10)

(1) LB

(2) LB

(3) LB

(4) LB

(5) LB

(6) LB

(7) LB

(8) LB

(9) LB

(10) LB

CN42-12

CN42-11

CN42-10

CN42-9

CN42-8

CN42-7

CN42-6

CN42-5

CN42-4

CN42-3

+5V

DWVR

SGND

+5VCN43-4

SGND

DLS1

+5V

SGND

DLS2

+5VCN43-10

CN43-1

CN43-2

CN43-3

CN43-5

CN43-6

CN43-7

CN43-8

CN43-9

LB (13)

LB (14)

LB (15)

LB (16)

LB (17)

LB (18)

LB (19)

LB (20)

LB (21)

LB (22)

(13) LB

(14) LB

(15) LB

(16) LB

(17) LB

(18) LB

(19) LB

(20) LB

(21) LB

CDE FG HI

CN44-12

CN44-11

CN44-10

+5V

DWVR

SGND

CN45-1

CN45-2

CN45-3

LB (25)

LB (26)

LB (27)

(25) LB

(26) LB

B

A

WIRING SYSTEMATIC DIAGRAM (SF-A56)

(27) LB

CN46-3

CN46-2

CN46-1

+5V

DWVR

SGND

CN47-1

CN47-2

CN47-3

LB (37)

LB (38

LB (39)

(28) LB

(29) LB

ASM-VR

(37) LB

(38) LB

DWVR

(30) LB

CN48-1

CN48-2

CN48-3

(39) LB

+5V

SGND

DLS1

DLS1

GP1A25LC

Original length sensor 1

Original width sensor

6

(22) LB

CN44-9

CN44-8

CN44-7

CN44-6

CN44-5

CN44-4

CN44-3

+5V

SGND

DLS1

+5V

SGND

DLS2

+5V

CN45-4

CN45-5

CN45-6

CN45-7

CN45-8

CN45-9

CN45-10

LB (28)

LB (29)

LB (30)

LB (31)

LB (32)

LB (33)

LB (34)

ASM-TRAY ASM-TR2 ASM-TR1

(31) LB

(32) LB

(33) LB

CN49-1

CN49-2

CN49-3

+5V

SGND

DLS2

DLS2

GP1A25LC

Original length sensor 2

5

PBA-CONTROL

SGND

DED

CN1-11

CN1-12

LB (11)

LB (12)

(11) LB

(12) LB

CN42-2

CN42-1

SGND

DED

CN43-11

CN43-12

LB (23)

LB (24)

(23) LB

(24) LB

CN44-2

CN44-1

SGND

DED

CN45-11

CN45-12

LB (35)

LB (36)

(34) LB

(35) LB

(35) LB

CN10-1

CN10-2

CN10-3

+5V

SGND

DED

DED

GP1A22HR

Original end sensor

(105) GN

(106) YW

(107) RD

(102) WE

(103) BK

(104) BE

(100) BK

(101) OE

CN7-1*ACN7-2

CN7-4*BCN7-5

CN7-3

CN7-6

CN7-7

CN7-8

B

+24V

AUOD

A

TGOD

+24V

(117) LB

(118) LB

(119) LB

(115) LB

(116) LB

CN8-1

CN8-2

CN8-4

CN8-5

CN8-3

CN8-6

CN8-7

DC+24V

FAN

+24V

DRSOL

AN+24V

RDD

RDDLED

(125) VT

(126) BN

(127) YW

(128) PK

(129) LB

(130) OE

(131) BE

(132) RD

(133) GY

CN9-1

CN9-2

CN9-3

CN9-4

CN9-5

CN9-6

CN6-1

CN6-2

CN6-3

CN6-4

SGND

TXD

RXD

DTR

DSR

RESET

DC+24V

PGND

+5V

SGND

EFGHI

(PWB-C)

+5V

SGND

DSS

SGND

DFMRS

+5V

MDL1

MDL2

SGND

CN2-1

CN2-2

CN2-3

CN2-4

CN2-5

CN2-6

CN2-7

CN2-8

CN2-9

LB (40)

LB (41)

LB (42)

LB (43)

LB (44)

LB (45)

LB (46)

LB (47)

LB (48)

ASM-SNR

+5V

DTD

DTDLED

+5V

DFD

DFDLED

+5V

SGND

DWS

NC

CN13-1

CN13-2

CN13-3

CN13-4

CN13-5

CN13-6

CN13-7

CN13-8

CN13-9

CN13-10

LB (58)

LB (59)

LB (60)

LB (61)

LB (62)

LB (63)

LB (64)

LB (65)

LB (66)

*B

CN4-1BCN4-2*ACN4-3ACN4-4

OE (76)

BE (77)

+24V

+24V

CN4-5

CN4-6

YW (78)

RD (79)

WE (80)

BK (81)

ASM-sensor I/F

BK

(46) LB

(47) LB

(40) LB

(41) LB

(42) LB

(43) LB

(44) LB

(45) LB

CN11-6

CN11-5

CN11-4

CN11-3

CN11-2

CN11-1

+5V

SGND

DSS

SGND

DFMRS

+5V

CN12-1

CN12-2

CN12-3

CN12-4

CN12-5

CN12-6

LB (49)

LB (50)

LB (51)

LB (52)

LB (53)

LB (54)

ASM-sensor 1

(49) LB

(50) LB

(51) LB

(52) LB

(53) LB

(54) LB

CN13-3

CN13-2

CN13-1

CN14-3

CN14-2

CN14-1

+5V

SGND

DSS

SGND

DFMRS

+5V

DSS

DFMRS

TLP1240(C5)

Original set sensor

(48) LB

CN15-3

CN15-2

MDL1CN16-1

MDL2

CN16-2

LB (55)

LB (56)

LB (57)

ASM-LED

(55) LB

(56) WE

(57) YW

CN17-3

CN17-2

MDL1

MDL2

LED

TLP1225(C5)

Paper feed motor rotation sensor

4

(58)

CN15-1

SGND

CN16-3

ASM-grounding pin

(58) (59)

CN17-1

SGND

(PWB-D)

Display LED

3

(58) LB

(59) LB

(60) LB

(61) LB

(62) LB

(63) LB

(64) LB

(65) LB

(67) LB

CN18-9

CN18-8

CN18-7

CN18-6

CN18-5

CN18-4

CN18-3

CN18-2

BK

(59)

+5V

DTD

CN19-1

BK BK

CN19-2

LB (67)

LB (68)

DTDLED

CN19-3

LB (69)

CN18-1

+5V

DFD

DFDLED

+5V

SGND

DWS

CN19-4

CN19-5

CN19-6

CN19-7

CN19-8

CN19-9

LB (70)

LB (71)

LB (72)

LB (73)

LB (74)

LB (75)

ASM-sensor 2

DTM

103H7124-1141

Current (belt) motor

(67) LB

(68) LB

(69) LB

(70) LB

(71) LB

(72) LB

(73) LB

(74) LB

(75) LB

CN20-1

CN20-3

CN20-2

CN21-3

CN21-2

CN21-1

CN22-3

CN22-2

CN22-1

+5V

DTD

DTDLED

+5V

DFD

DFDLED

+5V

SGND

DWS

DFD

DTD

PBA-SENSOR

-2214

Original timing sensor

DWS

PBA-SENSOR

-2214

TLP1241N(CS)

Original feed sensor

Original width sensor

2

1

CD

B

A

– 39 –

COPYRIGHT C 1996 BY SHARP CORPORATION

All rights reserved.

Printed in Japan.

No part of this publication may be reproduced,

stored in a retrieval system, or transmitted,

in any form or by any means,

electronic, mechanical, photocopying, recording, or otherwise,

without prior written permission of the publisher.

SHARP CORPORATION
Printing & Reprographic Systems Group
Quality & Reliability Control Center
Yamatokoriyama, Nara 639-11, Japan

1996 January Printed in Japan S