Konica Minolta DF-724 User Manual

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SERVICE MANUAL

Model

DF-724

FEBRUARY 1999

CSM-DF724

KONICA BUSINESS TECHNOLOGIES, INC.

DF-724

SERVICE MANUAL

FEBRUARY 1999

Used on Konica Model

7823

IMPORTANT NOTICE

Because of the possible hazards to an inexperienced person servicing this equipment, as well as the risk of damage to the equipment, Konica Business Technologies strongly recommends that all servicing be performed by Konica-trained service technicians only.

Changes may have been made to this equipment to improve its performance after this service manual was printed. Accordingly, Konica Business Technologies, Inc., makes no representations or warranties, either expressed or implied, that the information contained in this service manual is complete or accurate. It is understood that the user of this manual must assume all risks or personal injury and/or damage to the equipment while servicing the equipment for which this service manual is intended.

Corporate Publications Department

Printed in U.S.A.

GENERAL, MECHANICAL/ELECTRICAL

1. SPECIFICATIONS ........................................................................................... M-1

2. COMPONENTS IDENTIFICATION .................................................................M-3

3. CROSS-SECTIONAL VIEW ............................................................................M-4

4. DRIVE SYSTEM ..............................................................................................M-5

5. ELECTRICAL COMPONENT LAYOUT ...........................................................M-6

6. DESCRIPTION OF MODES ..................................... ............................ ...........M-7

6-1. Mixed Original Mode ................................................................................M-7

6-2. 1-Sided Original Mode .............................................................................M-7

6-3. 2-Sided Mode ..........................................................................................M-7

6-4. 2-in-1 Mode .............................. .............................. .............. ....................M-7

6-5. S-ADF (Single Feed) Mode .....................................................................M-7

6-6. Thin Mode (As set by “Original Thickness” of User’s Mode) ...................M-7

7. DOCUMENT TAKE-UP/FEEDING MECHANISM ............................................M-8

7-1. Construction ............................................................................................. M-8

7-2. Document Pick-Up Mechanism ............................................................... M-9

7-3. Document Take-Up Mechanism ..............................................................M-10

7-4. Separating Mechanism ............................................ ............................. ...M-11

7-5. Single Feed Mechanism ......................... ............... ............................. .....M-12

8. DOCUMENT TRANSPORT MECHANISM ......................................................M-13

8-1. Construction ............................................................................................. M-13

8-2. Document Transport Mechanism .............................................................M-13

8-3. Original Width Scale Retraction Mechanism ...........................................M-14

9. TURNOVER/EXIT MECHANISM ..................................................................... M-15

9-1. Construction ............................................................................................. M-15

9-2. Turnover/Exit Document Transport Mechanism ......................... .............M-16

9-3. Turnover/Exit Switching Mechanism ........................................................M-17

10. MISCELLANEOUS ..........................................................................................M-18

10-1.Document Size Detection Mechanism .....................................................M-18

10-2.Raised/Lowered Position Detecting Mechanism .....................................M-18

TEST MODES

1. TEST MODES ........ ........................... ............................ ........................... .......S-1

1-1. Paper Passage Check .............................................................................S-2

(1) Flow of Paper Passage Test ...........................................................S-3

(2) LED Status when the Copier is in Standby for

Paper Passage Test ........................................................................S-3

1-2. Unit Check ............................................ ........................... ........................S-4

1-3. Sensor Check ....................................... ............................. ......................S-6

1-4. Sensor Adjustment Check ...................... ............... ............................. .....S-8

DIS/REASSEMBLY, ADJUSTMENT

1. DISASSEMBLY ...............................................................................................D-1

1-1. Removal of the Document Transport Belt ................................................D-1

1-2. Removal of the Document Take-Up Roller Assy ...................... ...............D-2

1-3.Removal of the Document Take-Up and Separator Rollers ....................D-2

1-4. Removal of the Separator Pad ................................................................D-3

iii

1-5. Removal of the Document Take-Up Unit Assy ........................... .............D-4

1-6. Removal of the Turnover/Exit Assy .........................................................D-5

1-7. Removal of the Take-Up Motor/Transport Motor Unit ..............................D-6

2. ADJUSTMENTS ..............................................................................................D-7

2-1. Adjustment of Magnet Height ...................................... ............................D-7

2-2. Adjustment of the Document Feed Table ..... ................. ..........................D-8

2-3. Adjustment of the Single Feed Tray .............................. ................. .........D-9

2-4. Adjustment of Document Stop Position in the 1-Sided Mode ..................D-10

2-5. Adjustment of Document Stop Position in the 2-Sided Mode ..................D-11

2-6. Adjustment of Document Stop Position in the 2-in-1 Mode .....................D-12

2-7. Adjustment of Distance Between Documents in the 2-in-1 Mode ............D-13

2-8. Adjustment of Document Stop Position in the Single Feed Mode ...........D-14

2-9. Adjustment of ADF Registration Loop ............................................ .........D-15

2-10.Adjustment of Document Stopper Solenoid SOL1 ..................... .............D-16

2-11.Adjustment of Document Pressure Solenoid SOL2 ............. .. ..................D-17

2-12.Adjustment of Scale Solenoid SOL3 .............. ................................ .........D-18

2-13.Adjustment of Turnover/Exit Switching Solenoid SOL4 .............. .............D-19

2-14.Adjustment of the Separating Pressure of Document

Separator Pad ..........................................................................................D-20

2-15.Adjustment of the Distance Between Separator Rollers ........... ...............D-21

TROUBLESHOOTING

1. MISFEED DETECTION ...................................... ........................... ..................T-1

2. TROUBLESHOOTING PROCEDURE ...................... ............... ............... .........T-2

SAFETY PRECAUTIONS

Installation Environment

Safety considerations usually are directed toward machine design and the possibility of human error. In addition, the environment in which a machine is operated must not be overlooked as a potential safety hazard.

Most electrical equipment is safe when installed in a normal environment. However, if the environment is different from what most people consider to be normal, it is conceivable that the combination of the machine and the room air could present a hazardous combination. This is because heat (such as from fusing units) and electrical arcs (which can occur inside switches) have the ability to ignite flammable substances, including air.

When installing a machine, check to see if there is anything nearby which suggests that a poten-

tial hazard might exist. For example, a laboratory

might use organic compounds which, when they evaporate, make the room air volatile. Potentially dangerous conditions might be seen or smelled. The

presence of substances such as cleaners, paint thinners, gasoline, alcohol, solvents, explosives, or similar items should be cause for concern.

If conditions such as these exist, take appropriate action, such as one of the following suggestions.

effect may be caused by altering any aspect of the machine’s design. Such changes have the potential of degrading product performance and reducing safety margins.

For these reasons, installation of any modification not

specifically authorized by Konica Business Machines U.S.A., Inc., is strictly prohibited.

The following list of prohibited actions is not all-inclusive, but demonstrates the intent of this policy.

• Using an extension cord or any unauthorized power cord adapter.

• Installing any fuse whose rating and physical size differs from that originally installed.

• Using wire, paper clips, solder, etc., to replace or eliminate any fuse (including temperature fuses).

• Removing (except for replacement) any air filter.

• Defeating the operation of relays by any means

(such as wedging paper between contacts).

• Causing the machine to operate in a fashion other than as it was designed.

• Making any change which might have a chance of defeating built-in safety features.

• Using any unspecified replacement parts.

• Determine that the environment is controlled

(such as through the use of an exhaust hood) so that an offending substance or its fumes cannot reach the machine.

• Remove the offending substance.

• Install the machine in a different location.

The specific remedy will vary from site to site, but the principles remain the same. To avoid the risk of injury or damage, be alert for changes in the environment when performing subsequent service on any machine, and take appropriate action.

Unauthorized Modifications

Konica copiers have gained a reputation for being reliable products. This has been attained by a combination of outstanding design and a knowledgeable service force.

The design of the copier is extremely important. It is the design process that determines tolerances and safety margins for mechanical, electrical, and electronic aspects. It is not reasonable to expect individuals not involved in product engineering to know what

General Safety Guidelines

This copier has been examined in accordance with the laws pertaining to various product safety regulations prior to leaving the manufacturing facility to protect the operators and service personnel from injury. However, as with any operating device, components will break down through the wear-and-tear of everyday use, as will additional safety discrepancies be discovered. For this reason, it is important that the technician periodically performs safety checks on the copier to maintain optimum reliability and safety.

The following checks, not all-inclusive, should be made during each service call:

CAUTION: Avoid injury. Ensure that the copier is disconnected from its power source before continuing.

• Look for sharp edges, burrs, and damage on all external covers and copier frame.

• Inspect all cover hinges for wear (loose or broken).

• Inspect cables for wear, frays, or pinched areas.

SAFETY PRECAUTIONS

• Ensure that the power cord insulation is not damaged (no exposed electrical conductors).

• Ensure that the power cord is properly mounted to the frame by cord clamps.

• Check the continuity from the round lug (GND) of the power cord to the frame of the copier -- ensure continuity. An improperly grounded machine can cause an electrically-charged machine frame.

Safeguards During Service Calls

Confirm that all screws, parts, and wiring which are removed during maintenance are installed in their original positions.

• When disconnecting connectors, do not pull the wiring, particularly on AC line wiring and high voltage parts.

• Do not route the power cord where it is likely to be stepped on or crushed.

• Carefully remove all toner and dirt adhering to any electrical units or electrodes.

• After part replacement or repair work, route the wiring in such a way that it does not contact any burrs or sharp edges.

• Do not make any adjustments outside of the specified range.

Applying Isopropyl Alcohol

Care should be exercised when using isopropyl alcohol, due to its flammability. When using alcohol to clean parts, observe the following precautions:

• Remove power from the equipment.

• Use alcohol in small quantities to avoid spillage

or puddling. Any spillage should be cleaned up with rags and disposed of properly.

• Be sure that there is adequate ventilation.

• Allow a surface which has been in contact with

alcohol to dry for a few minutes to ensure that the alcohol has evaporated completely before applying power or installing covers.

Summary

It is the responsibility of every technician to use professional skills when servicing Konica products. There are no short cuts to high-quality service. Each copier must be thoroughly inspected with respect to safety considerations as part of every routine service call. The operability of the copier, and more importantly, the safety of those who operate or service the copier, are directly dependent upon the conscientious effort of each and every technician.

Remember...when performing service calls, use good judgement (have a watchful eye) to identify safety hazards or potential safety hazards that may be present, and correct these problem areas as they are identified -- the safety of those who operate the copier as well as those who service the copier depend on it!

GENERAL,

MECHANICAL/

ELECTRICAL

1 SPECIFICATIONS

Name : Duplexing Document Feeder Type : Paper Take-Up: Take-up from top of stack, U-turn feeding

Installation : Mounted onto the copier Type of Document : Plain paper

Detectable Document Sizes

Capacity : Document Feed Table:

Alignment : Aligned along the rear Document Edge Guide Document Loading : Face up (Single Feed Mode-Face down) Modes : 1-Sided Original

Power Source : 24 VDC, supplied from the copier Power Consumption : 60W or less/2.5A Dimensions : Width 627 mm

Weight : 13.0 kg

Transport: Automatic single-belt transport system Turnover: Loop turnover system Ejection: U-turn ejection

1-Sided and Dual Original Scanning (2-in-1) Modes: 50 to 100 g/m² 2-Sided Mode : 60 to 90 g/m² Mixed Original Mode : 60 to 90 g/m² Single Feed Mode : 35 to 200 g/m²

: A3L, B4L, A4LC, B5LC, A5L, 11” × 17”L, 8-1/2” × 14”L,

8-1/2” × 11”LC, 11” × 15”L, 8-1/4” × 13”L

A4 or smaller 50 sheets (of paper weighing 80 g/m²) B4 or larger 30 sheets (of paper weighing 80 g/m²) Document Exit Table: A4 or smaller 50 sheets (of paper weighing 80 g/m²) B4 or larger 30 sheets (of paper weighing 80 g/m²)

2-Sided Original 2-in-1 Mixed Original Single Feed Mode

Depth 515 mm Height 125 mm

The “Original Thickness” function of User’s Choice permits selection between the plain paper and thin paper mode.

M-1

Documents which cannot be used

Type of Document Possible Trouble

Documents stapled or clipped together Take-up failure, damaged document, defec-

Documents glued together Take-up failure, damaged document Documents folded, torn, or wrinkled Take-up failure, damaged document Documents severely curled Documents mis-fed due to being dog-eared

: The following documents, if used in the DF-724, are very

likely to cause trouble.

tive drive train due to jammed staples or clips.

Documents for which feeding cannot be guaranteed

Type of Document Possible Trouble Slightly curled documents Dog-eared pages, ejection failure Heat-sensitive paper for facsimile Crease, ejection failure Coated documents Take-up failure Documents with uneven surface (letter head

etc.) Translucent paper Take-up failure, transport failure Paper just ejected from the ADF Take-up failure, transport failure Perforated documents (loose leafed etc.) Take-up failure, transport failure Documents weighing 40 to 50 g/m² Folded leading edge, transport failure Folded documents Transport failure, distorted image

: The following documents, if used in the DF-724, may or

may not cause trouble.

Take-up failure

M-2

2 COMPONENTS IDENTIFICATION

1. Hookup Cord

2. Maintenance Cover

3. Take-Up Cover

4. Single Feed Tray

5. Document Feed Table

6. Turnover Cover Release Switch

7. Turnover Cover

8. Transport Belt

9. Magnet Catches

4486M019AA

4486M037AA

M-3

3 CROSS-SECTIONAL VIEW

18 19

13141516

1. Document Detecting Sensor (S1)

2. Document Take-Up Roller

3. Document Separator Roller

4. Registration Sensor

5. Single Feed Transport Roller

6. Manual Feed Take-up Sensor (PWB-D)

7. Single Feed Transport Roll

8. Registration Driven Roller

9. Registration Drive Roller

10. Size Sensor

12 3 456

11. Transport Belt Drive Roller

12. Transport Rolls

13. Transport Belt Guide Roller

14. Transport Belt Driven Roller

15. Exit Roller

16. Turnover Roller

17. Turnover/Exit Sensor

18. Turnover/Exit Switching Plate

19. Exit Roll

11 1098717

4486M015AB

M-4

4 DRIVE SYSTEM

Turnover/Exit Mechanism

Turnover/Exit Motor (M3)

Take-Up/Transport Mechanism

Take-U p Motor (M1)

Transport Motor (M2)

Transport Belt Drive Mechanism

4486M038AA

M-5

5 ELECTRICAL COMPONENT LAYOUT

Code Name Code Name

PWB-A PWB-B PWB-C PWB-D PWB-E M1 M2 M3

Main Control Board Registration Sensor Size Sensor Manual Feed Take-up Sensor Turnover/Exit Sensor Take-Up Motor Transport Motor Turnover/Exit Motor

SOL1 SOL2 SOL3 SOL4 S1 S2 S3 MICLK

Document Stopper Solenoid Document Pressure Solenoid Scale Solenoid Turnover/Exit Switching Solenoid Document Detecting Sensor Feed Cover Set Switch Turnover Cover Set Switch Document Feed Motor Pulse Sensor

4486M039AA

M-6

6 DESCRIPTION OF MODES

6-1. Mixed Original Mode

•

If the Mixed Orig key on the control panel is pressed when the copier is set in 1- or 2sided mode, or 2-in-1 mode, the copier detects the size of the document each time a document is taken up and fed in. The copier feeds the copy paper of a size selected from among the available paper sources according to the document size detected.

6-2. 1-Sided Original Mode

•

When in this mode, the copier detects the size of the document which is taken up and fed in first.

•

The copier therefore needs to determine the size of the copy paper only once based on the detected document size and the copying setting made on the control panel. This makes for faster paper feed timing on the part of the copier.

Note:

If a set of documents of varying sizes are used in this mode, image trouble could result including missing copy image. (The system does not force a misfeed condition.)

6-3. 2-Sided Mode

•

The copier automatically turns over the 2-sided document for a speedy copying operat ion (copies are made in the order of the first and second pages).

6-4. 2-in-1 Mode

•

When in this mode, the copier positions two different documents on the Original Glass side-by-side for making a copy of the two documents onto one side of a single sheet of paper in a single copy run.

•

If this mode is to be used for a set of documents of different widths, the Mixed Orig key must first be pressed.

6-5. S -ADF (Single Feed) Mode

•

When a single document is placed in the Single Feed T ra y, the ADF automatically takes it up and feeds it in to let the copier run a single copy cycle.

Note:

The ADF automatically takes up and feeds in documents even when two or more documents are placed on the Single Feed Tr a y; Howe ver, it could result in a double feed or other faulty condition. Only one document should therefore be loaded.

6-6. Thin Mode (As set by “Original Thickness” of User’s Mode)

•

When in this mode, the ADF transports the document at a low speed and stops it without letting it hit against the Original Width Scale.

M-7

7 DOCUMENT TAKE-UP/FEEDING MECHANISM

7-1. Construction

4486M001AA

No. Name No. Name

Feed Cover Set Sensor (S2)

Document Pressure Pad

Document Feed Motor Pulse Sensor (M1CLK)

Document Pressure Solenoid (SOL2)

Document Stopper Solenoid (SOL1)

Take-Up Motor (M1)

Transport Motor

Registration Sensor (PWB-B)

Manual Feed Take-up Sensor (PWB-D)

Registration Drive Roller

Single Feed Transport Roller

Registration Driven Roller

Document Separator Roller

Document Take-Up Roller

Size Sensor (PWB-C)

Document Stopper Guide Plate

M-8

7-2. Document Pick-Up Mechanism

4486M021CA

•

The document pick-up mechanism consists of the Document Pressure Pads, Document Stopper Guide Plate and Document Take-Up Roller.

•

When documents are loaded on the document feed table, they are pressed against the Document Take-Up Roller by the Document Pressure Pads, then they are taken up by the Document Take-Up Roller one by one, commencing with the one from the bottom of the stack.

•

The Document Stopper Guide Plate determines the leading edge position of the documents loaded in the ADF. It is normally in the raised position, and is lowered at the start of pick-up motion.

SOL1/2 C ontrol

SOL 1 and 2 are energized and de-energized by the signal output from IC3A on PWB-A.

SOL1 IC3A-20 IC3A-21 SOL2 IC3A-16

(Stopper UP)

OFF

(Stopper

DOWN)

ON H

OFF L

M-9

7-3. Document Take-Up Mechanism

4486T02MAA

4486T01MAA

4486T03MAA

4486T02MAA

4486M022CA

•

The document take-up mechanism takes up a document from the bottom of a set of documents loaded on the Single Feed Tray and feeds it up to the registration roller. It is driven by the Take-Up Motor.

•

The Take-Up motor (M1) rotates the Document Take-Up Roller, Document Separator Roller and Single Feed Transport Roller via Gears, Pulleys and Timing Belt.

M1 Control

M1 is controlled by the following output signals. M1 speed is detected by the pulse disk mounted on the motor output shaft and Document Feed Motor Pulse Sensor (M1 CLK). M1 pulses are applied to IC1A-74, and period A is maintained at the same length so that the motor rotates at a constant speed.

IC3 Forward Backward

Pin 65 (MIL1)

4486T01MAA

Pin 66 (MUL2)

4486T02MAA

Pin 67 (MIHI)

4486T02MAA

Pin 68 (MIL2)

4486T03MAA

M-10

7-4. Separating Mechanism

4486M034CA

4486M023CA

•

Movable Separator Guide Plates are used in the Document Separating Mechanism. The height of the 1st and 2nd Separator Guide Plates can be adjusted by a lever or scr ews, respectively.

•

Lowering the Guide Plates can reduce the occurrence of Smudging on the back of documents and smearing of the document image by reducing the number of documents delivered of the Separator Roller.

Note:

Both 1st and 2nd Separator Guide Plates have been set i n the r aised position at the t ime of shipment from the factory.

•

The Separator Pad is designed to be pressed against the Separator Rollers. This ensures that documents are transported one by one even if two or more documents are fed from the Take-Up Roller.

M-11

7-5. Single Feed Mechanism

•

The single feed mechanism is used to copy documents one at a time only.

•

Open the Single Feed Tray and set a document in place. The Manual Feed Take-up Sensor (PWB-D) will detect the document and the Single Feed Transport Roller/Registration Roller begins to rotate to take up the document automatically even if the Start key is not pressed.

Take-Up Motor (M1)

Transport Motor (M2)

Manual Feed Take-up Sensor (PWB-D)

Single Feed Transport RollerRegistration Drive Roller

M-12

4486M006AB

8 DOCUMENT TRANSPORT MECHANISM

8-1. Construction

4486M025CA

8-2. Document Transport Mechanism

•

The document transport mechanism transport the document, which has been fed up to the Registration Roller from the document take-up mechanism, up to the Original Width Scale by means of the Document T r ansport Belt.

•

During the turnover motion, the Document Transport Belt is turned to transport the document toward the take-up end.

M2 Control

Whether M2 is turned forward or backward is determined by the combination of the following signals output from IC4 on PWB-A.

IC4

Pin 2 H H L L Pin 3 L L H H Pin 6 L H H L Pin 7 H L L H

Forward Rotation

Backward Rotation

Step 1 Step 2 Step 3 Step 4

Procedure

M-13

8-3. Original Width Scale Retraction Mechanism

•

When the document is positioned on the Original Glass by the ADF, the leading edge of the document is pressed against the Original Width Scale to improve positioning accuracy. During turnover and ejection motion, however, the document must move over the Original Width Scale. For this reason, the Original Width Scale retraction mechanism is employed.

•

Scale Solenoid SOL3 is used to drive the retraction mechanism.

When the document is positioned : SOL3 is de-energized and the Original Width

Scale is raised by the tension of the Original Width Scale Spring.

While the document is being transported and during a copy cycle

: SOL3 is energized and the Original Width

Scale is pressed downward by the Original Width Scale Drive Lever and spring.

4486M026CA

4486D030AA

4486M027CA

4486D032AA

SOL3 Control

The SOL3 is energized and de-energized by the signal output from IC3A on PWB-A.

SOL3 IC3A-14

ON H

OFF L

M-14

9 TURNOVER/EXIT MECHANISM

9-1. Construction

4486M028CA

M-15

9-2. Turnover/Exit Document Transport Mechanism

4486M030CA

•

The turnover/exit document transport mechanism turns over and ejects the document which has been transported by the document transport mechanism. It is driven by the Turnover/ Exit Motor (M3).

•

M3 turns both the Turnover Roller and Exit Roller. These rollers are turned in the same direction regardless of whether a document is turned over or ejected from the ADF.

M3 Control

Whether M3 is turned forward or backward is determined by the combination of the following signals output from IC13 or PWB-A.

IC13

Pin 2 HHHLLLLL Pin 3 LLLLHHHL Pin 6 L L H H H L L L Pin 7 HLLLLLHH

Forward Rotation

Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Step 7 Step 8

Procedure

M-16

9-3. Turnover/Exit Switching Mechanism

•

The turnover/exit switching mechanism uses the Turnover/Exit Switching Plate which is swung downward or upward to change the document path, thereby allowing the document to be turned over or ejected from the ADF. This plate is actuated by the Turnover/ Exit Switching Solenoid (SOL4).

4486M031CA

SOL4 Control

The SOL4 is energized and de-energized by the signal output from IC3A on PWB-A.

SOL4 IC3A-17

ON H

OFF L

4486M032CA

M-17

10 MISCELLANEOUS

10-1. Document Size Detection Mechanism

1. Width Detection

•

The width of the document is detected by the sensor located on the Size Sensor (PWB-C).

•

The sensor is turned ON and OFF by actuator located at points approx. 268 mm respectively, from the Rear Document Guide.

2. Length Detection

•

The length of the document is detected by the number of pulses generated by the Transport Motor (M2) for the period in which the Registration Roller starts turning and the trailing edge of the document passes the Registration Sensor (PWB-B).

10-2. Raised/Lowered Position Detecting Mechanism

•

DF Set Switch is located at the front left corner of the copier and a magnet catch is mounted on the front left of the ADF. The position of the ADF, whether raised or lowered, can be detected as the reed switch is turned ON and OFF by the magnet catch.

•

Opening/closing the ADF serves to reset a misfeed condition and allows selection of a Test Mode operation.

M-18

4486M033CA

TEST MODES

1 TEST MODES

SW1

PSW1

1. The test mode is initiated when the DIP switch (SW1-6) is set to ON with the Main Switch of the copier set to OFF and then Main Switch is ON.

SW1-6

2. Various test modes are available. They can be selected by a combination of DIP switches (SW1-1 to 1-6).

123456

ON Test Mode

OFF Normal Mode

LED5 LED4

LED3 LED2 LED1

4486M014AB

S-1

1-1. Paper Passa ge Check

1. With the Main Switch set to OFF, select the desired test mode as shown below.

Transport Speed

High-speed Mode OFF OFF – – – ON

Medium-speed Mode ON OFF – – – ON

Low-speed Mode OFF ON – – – ON

2. Select whether documents are to be fed continuously or intermittently.

Continuous Feed After the desired test mode is selected, turn the Main Switch ON. Intermittent Feed While holding down PSW1, turn the Main Switch ON.

3. Select the plain paper mode or thin paper mode.

Test Mode SW1-3

Plain Paper OFF

Thin Paper ON

4. Select the desired test mode from the table below, then open and close the ADF to confirm the selection.

Test Mode

1-sided Non-mixed Mode (high-speed)

1-sided Mixed Mode (normal) ON OFF – – – ON 2-sided Mode OFF ON – – – ON 2-in-1 Mode OFF ON – – – ON

123456

OFF OFF – – – ON

SW1

✽

The following two modes are available to allow the user to check the actual paper stop position by stopping the paper without allowing it to contact the Original Width Scale and then raising the Scale. These modes are available only when the plain paper mode is selected.

1. 1-sided document

•

Turn PSW1 ON with the ADF open, then close the ADF and carry out the test.

2. 2-sided document

•

Turn PSW1 ON with the turnover cov er open, then close the cover and carry out the test.

S-2

(1) Flow of Paper Passage Test

Select the desired test mode.

Load a required number of sheets of paper on the Single feed Tray, then turn PSW1 ON.

Turning PSW1 ON during a test will interrupt the test. Turning it ON again will eject all the

•

sheets of paper and terminate the test. In the case of the intermittent mode, the test is carried out each time the PSW1 is turned ON.

•

(2) LED Status when the Copier is in Standby for Paper Passage Test

•

Faulty sections are indicated as foll ows while the copier is in standb y f or a paper passage test. If no fault is present, all the LEDs (LED1 to 4) will be OFF.

LED

12345

◆❍❍❍ ❍◆❍❍ ❍❍◆❍

Take-up cover set is faulty. ADF set is faulty. Turnover cover set is faulty.

The selected test mode starts.

Description

: For monitoring

❍

: Not lit

◆

: Lit up

Note

LED5 blinks at all times.

S-3

1-2. Unit Check

1. Set SW1-6 to ON with the Main Switch set to OFF.

2. Tur n the Main Switch ON, select the desired mode from the following table, then open and close the ADF to confirm the selection.

Test Mode

Take-Up Motor Check OFF OFF ON OFF OFF OFF Transpor t Motor Check ON OFF ON OFF OFF OFF Exit Motor Check OFF ON ON OFF OFF OFF Solenoid Check ON ON ON OFF OFF OFF

3. Turn PSW1 ON to start th e test.

- Take-Up Motor Check -

4486S001AA

❍

◆

123456

LED Number of

12345

❍❍❍❍

◆❍❍❍ ❍◆❍❍

◆◆❍❍

: For monitoring

: Not lit

: Lit up

SW1

Times PSW1 is

Turned ON

0Stop 1 Forward rotation 2Stop 3 B ackward rotation

Operation

S-4

- Transport Motor Check -

4486S003AA

- Exit Motor Check -

LED Number of

12345

❍❍❍❍

◆❍❍❍ ❍◆❍❍

◆◆❍❍ ❍❍◆❍

◆❍◆❍ ❍◆◆❍

◆◆◆❍ ❍❍❍◆

◆❍❍◆ ❍◆❍◆

◆◆❍◆

: For monitoring

❍

: Not lit

◆

: Lit up

Times PSW1 is

Tur ned ON

0Stop 1 2Stop 3 4Stop 5 6Stop 7 8Stop

9 10 Stop 11

Operation

High-speed/

Forward rotation

High-speed/

Backward rotation

Medium-speed/

Forward rotation

Medium-speed/

Backward rotation

Low-speed/

Forward rotation

Low-speed/

Backward rotation

4486S005AA

LED Number of

12345

❍❍❍❍

◆❍❍❍ ❍◆❍❍

◆◆❍❍ ❍❍◆❍

◆❍◆❍ ❍◆◆❍

◆◆◆❍

: For monitoring

❍

: Not lit

◆

: Lit up

S-5

Times PSW1 is

Turned ON

0Stop 1 2Stop 3 4Stop 5 6Stop

7 Eject speed

Operation

High-speed/

Rotation

Medium-speed/

Rotation

Low-speed/

Rotation

- Solenoid Check -

4486S007AA

LED Number of

12345

❍❍❍❍

◆❍❍❍

❍◆❍❍

◆◆❍❍

❍❍◆❍

◆❍◆❍

❍◆◆❍

◆◆◆❍

: For monitoring

❍

: Not lit

◆

: Lit up

Times PSW1 is

Turned ON

0Stop 1 SOL1: Descent 2 SOL1: Ascent 3 SOL2: ON 4 SOL2: OFF 5 SOL3: ON 6 SOL3: OFF 7 SOL4: ON

Operation

1-3. Sensor Check

1. Set the SW1-6 to ON with the Main Switch set to OFF.

2. Tur n the Main Switch ON, select the desired mode from the following table, then open and close the ADF to confirm the selection.

Test Mode

Paper Passage Sensor OFF OFF OFF OFF OFF OFF Cover Sensor ON OFF OFF OFF OFF OFF Other Sensors OFF ON OFF OFF OFF OFF

123456

SW1

3. Block each sensor with a piece of paper etc. to check whether the corresponding LED lights up.

LED Status

Paper is present : Lit No paper present : Not lit

S-6

- Paper Passage Sensor Check -

4486S009AA

4486S010AA

- Cover Sensor Check -

4486S011AA

4486S012AA

- Other Sensors Check -

LD1 :Document Detecting Sensor (S1) LD2 :Manual Feed Take-up Sensor (PWB-D) LD3 :Registration Sensor (PWB-B) LD4 :Tur nover/Exit Sensor (PWB-E)

LD1 :Feed Cover Set Sensor (S2) LD2 :Size Reset Switch (S108) LD3 :Turnover Cover Set Switch (S3)

4486S013AA

LD1 :Size Sensor (Rear)

4486S014AA

LD2 :Size Sensor (Center) LD3 :Size Sensor (Front) LD4 :Document Feed Motor Pulse Sensor (M1CLK)

PWB-C

Note1

LD1, LD3 Japan Only

Note2

LD4 (Document Feed Motor Pulse Sensor) lights up when the sensor is blocked, and goes out when the sensor is unblocked.

S-7

1-4. Sensor Adjustment Check

1. Set the SW1-6 to ON with the Main Switch set to OFF.

2. T urn the Main Switch ON, select the sensor adjustment mode as shown in the following table, then open and close the ADF to confirm the selection.

Test Mode

Sensor Adjustment ON OFF OFF ON OFF OFF

3. Turn the PSW1 ON to start the test.

123456

SW1

Note

An error will occur if adjustment is carried out with the take-up/turnover cover open. So make sure that the cover is closed before starting adjustment.

- Registration Sensor Adjustment -

LED1 LED2 S ensor Status

4486S015AA

- Exit Sensor Adjustment -

4486S016AA

❍❍ ❍◆

◆❍

◆◆

LED3 LED4 Sensor Status

❍❍ ❍◆

◆❍

◆◆

❍

: Not lit

◆

: Lit up

Initialized Upper-limit error Lower-limit error

Adjustment complete

Initialized Upper-limit error Lower-limit error

Adjustment complete

S-8

DIS/REASSEMBLY,

ADJUSTMENT

Precautions for Disassembly, Reassembly, and Adjustment CAUTION

1. Before attempting to disassemble the DF-724, always make sure that no power is being supplied from the copier.

2. While power is being supplied to the DF-724, do not attempt to remove/install the print jacks from/to the PWBs or unplug/plug in the connectors.

3. If the DF-724 is run with its Covers removed, use care not to allow your clothing to be caught in revolving parts such as the Timing Belt.

4. The basic rule is do not run the DF-724 any time during dis/reassembly.

Important

1. A toothed washer is used with the screw that secures the ground wire to ensure positive conduction. Do not forget to insert this washer at reassembly.

2. To reassemble the DF-724, reverse the order of disassembly unless otherwise specified.

3. Do not attempt to loosen or remove the screw to which red paint has been applied.

Purpose of Applying Red Paint

Red paint is applied to those screws that cannot be readjusted or reinstalled in the field.

4. Do not attempt to loosen or remove the two screws that secure the Right Hinge through those screws are not painted red. (Metric Areas Only)

1 DISASSEMBLY

1-1. Removal of the Document Transport Belt

•

Push the lever to the left, then snap off the C clip to release the Belt assy.

•

Hold the top of the Transport Belt Assy and tilt the Assy towards you to remove it.

4486D001AA

•

Remove two screws as shown in the figure, then bend the Exit Roller side to remove the Transport Belt.

4486D002AA

D-1

1-2. Removal of the Document Take-Up Roller Assy

•

Remove the Transport Belt, then remove the Cover and Document Stopper Guide Plate to remove the Take-Up Roller Assy.

4486D003AA

1-3. Removal of the Document Take-Up and Separator Rollers

•

Snap off the four C clips, then remove the rollers one by one.

NOTE

Take care not to lose the two pins attached to the Document Take-Up Roller.

D-2

4486D040CA

1-4. Removal of the Separator Pad

•

Open the Single Feed Single Feed Tray and Feed Cover, then remove four screws to remove the Feed Cov er.

•

Push each Separator Pad to slide it upwards and remove it.

4486D011AA

D-3

1-5. Removal of the Document Take-Up Unit Assy

•

Remove the Transport Belt.

•

Remove the Maintenance Cover and unplug the connectors from PWB-A as shown in the figure. Remove the Single Feed Tray.

4486D005AA

•

Remove the ADF from the copier, and place it on a table upside down.

•

Remove the Cover.

•

Remove five screws, open the Feed Cover and lift out the Document Take-Up Unit Assy.

4486D006AA

NOTE

When reinstalling the Document Take-Up Unit Assy, make sure that the Feed Cover is

•

open. Tighten the five screws lightly by hand, then tighten securely after the ADF is reinstalled on the copier.

D-4

1-6. Removal of the Turnover/Exit Assy

•

Remove the Transport Belt, Maintenance Cover and unplug the connectors from PWB-A as shown in the figure.

•

Open the Turnover/Exit Cover and remove the screw.

4486D007AA

•

Remove the Cover and grounding wire (black).

•

Remove five screws, open the Turnover/Exit Cover and lift out the Turnover/Exit Unit Assy.

4486D008AA

NOTE

When reinstalling the Turnover/Exit Unit Assy, make sure that the Turnover/Exit Cover is open.

D-5

1-7. Removal of the Take-Up Motor/Transport Motor Unit

•

Remove the Take-Up Unit Assy.

•

Remove three screws, unplug f rom connectors, tak e out two wire saddles and a spring to remove the Motor Unit.

4486D010AA

D-6

2 ADJUSTMENTS

2-1. Adjustment of Magnet Height

Requirement

The clearance between the Magnetic Catch and Original Glass should be 0 to 0.5 mm.

•

1. Remove the Transport Belt and two Screw Covers. (Push up from inside)

4486D012AB

2. Set the T ransport Belt and, close the ADF, loosen the Magnetic Catch adjusting screws, check the clearance of the Magnet Catch, then tighten the adjusting screws.

D-7

4486D013AA

2-2. Adjustment of the Document Feed Table

Requirement

The document Feed Table should be positioned within 0±1 mm from the edge of the Doc-

•

ument Positioning Plate.

1. Slide the Document Positioning Plate towards the rear and secure it with tape.

2. Affix a piece of tape to each of the Magnet Catch Plates.

4486D014AB

4486D045AA

3. Place a document on the Document Feed Table and select 1-sided mode.

4. Press the Start key, then press the Stop key immediately.

5. Open the ADF gently and remove the tape from the Document Positioning Plate, taking care not to allow the document to move.

6. Check whether the document is aligned with the edge of the Document Positioning Plate.

7. If the document is off in direction “a”, move the Document Feed Table towards you. If the document is off in direction “b”, move the Document Feed Table towards the rear.

a b

4486D015AA 4486D034AA

D-8

2-3. Adjustment of the Single Feed Tray

Requirement

The document Feed Table should be positioned within ±1 mm from the edge of the Doc-

•

ument Positioning Plate.

1. Slide the Document Positioning Plate towards the rear and secure it with tape.

2. Affix a piece of tape to each of the Magnet Catch Plates.

4486D014AB

4486D045AA

3. Place a document on the Document Feed Table and select 1-sided mode.

4. Press the Start key, then press the Stop key immediately.

5. Open the ADF gently and remove the tape from the Document Positioning Plate, taking care not to allow the document to move.

6. Check whether the document is aligned with the edge of the Document Positioning Plate.

7. If the document is off in direction “a”, move the Single Feed Tray to wards y ou. I f the document is off in direction “b”, move the Single Feed Tray towards the rear.

a b

4486D015AA

4474U008AA

D-9

2-4. Adjustment of Document Stop Position in the 1-Sided Mode

Requirement

The document should be 0 to 1 mm in the direction of b from the end face of the Original

•

Width Scale.

1. Set “U-4” (Lightweight Original) of User’s Choice to “1.” (Make the adjustment in the Lightweight Original mode.)

NOTE

Metric areas only

2. Slide the Document Positioning Plate towards the rear and secure it with tape.

3. Affix a piece of tape to each of the Magnet Catch Plates.

4486D014AB

4. Place a document on the Document Feed Table, and select 1-sided original/1-sided copy mode.

5. Press the Start key, then press the Stop key immediately.

6. Open the ADF gently and check whether the document is aligned with the edge of the Original Glass.

7. Set the service choice mode “c-31”.

8. Referring to page D-16, adjust the document stop position.

4486D016AA

4486D045AA

D-10

2-5. Adjustment of Document Stop Position in the 2-Sided Mode

Requirement

The document should be 0 to 1 mm in the direction of b from the end face of the Original

•

Width Scale.

1. Set “U-4” (Lightweight Original) of User’s Choice to “1.” (Make the adjustment in the Lightweight Original mode.)

NOTE

Metric areas only

2. Slide the Document Positioning Plate towards the rear and secure it with tape.

3. Affix a piece of tape to each of the Magnet Catch Plates.

4486D014AB

4. Place a document on the Document Feed Table, and select 2-sided original/1-sided copy mode.

5. Press the Start key, then press the Stop key immediately.

6. Open the ADF gently and check whether the document is aligned with the edge of the Original Glass.

7. Set the service choice mode “c-32”.

8. Referring to page D-16, adjust the document stop position.

4486D016AA

4486D045AA

D-11

2-6. Adjustment of Document Stop Position in the 2-in-1 Mode

Requirement

The document should be 0 to 1 mm in the direction of b from the end face of the Original

•

Width Scale.

1. Set “U-4” (Lightweight Original) of User’s Choice to “1.” (Make the adjustment in the Lightweight Original mode.)

NOTE

Metric areas only

2. Slide the Document Positioning Plate towards the rear and secure it with tape.

3. Affix a piece of tape to each of the Magnet Catch Plates.

4486D014AB

4. Place two A4Y documents on the Document Feed Table, and select 1-sided original/1sided 2-in-1 copy mode.

5. Press the Start key, then press the Stop key immediately.

6. Open the ADF gently and check whether the document is aligned with the edge of the Original Glass.

7. Set the service choice mode “c-33”.

8. Referring to page D-16, adjust the document stop position.

4486D016AA

4486D045AA

D-12

2-7. Adjustment of Distance Between Documents in the 2-in-1

Mode

Requirement

The second document should be 0 to 1 mm in the direction of b from the trailing edge of

•

the first document.

1. Set “U-4” (Lightweight Original) of User’s Choice to “1.” (Make the adjustment in the Lightweight Original mode.)

NOTE

Metric areas only

2. Slide the Document Positioning Plate towards the rear and secure it with tape.

3. Affix a piece of tape to each of the Magnet Catch Plates.

4486D014AB

4. Place two A4Y documents on the Document Feed Table, and select 1-sided original/1sided 2-in-1 copy mode.

5. Press the Start key, then press the Stop key immediately.

6. Open the ADF gently and check whether the 2nd document is positioned correctly in relation with the 1st document.

7. Set the service choice mode “c-34”.

8. Referring to page D-16, adjust the document stop position.

4486D017AA

4486D045AA

D-13

2-8. Adjustment of Document Stop Position in the Single Feed

Mode

Requirement

The document should be 0 to 1 mm in the direction of b from the end face of the Original

•

Width Scale.

1. Set “U-4” (Lightweight Original) of User’s Choice to “1.” (Make the adjustment in the Lightweight Original mode.)

NOTE

Metric areas only

2. Slide the Document Positioning Plate towards the rear and secure it with tape.

3. Affix a piece of tape to each of the Magnet Catch Plates.

4486D014AB

4. Place a document into the Manual Feed Port, and press the Stop key immediately.

5. Open the ADF gently and check whether the document is aligned with the edge of the Original Glass.

6. Set the service choice mode “c-37”.

7. Referring to page D-16, adjust the document stop position.

4486D016AA

4486D045AA

D-14

2-9. Adjustment of ADF Registration Loop

1. Place a document on the Document Feed Table and press the Start key.

2. Change the setting for service choice “c-38”, remove the document and place it on the Document Feed Table again, then press the Start key.

3. Referring to the table below, repeat steps 1 and 2 until the document is positioned so that it can be transported by the Transport Belt.

Setting Method

➝

A. Press the Stop

B. Select the desired mode, then press the Start key. C. Press the Clear key to clear the currently selected value. D. Referring to the table below, enter a setting equivalent to the deviation. E. Press the Start key to confirm the entry. F. Press the Reset key twice to return to the main screen.

Stop Position Adjustment Table

0 ➝ Stop ➝ 1 ➝ 2keys in that order

Setting

Deviation

(mm) 43 7 44 6 52 2 45 5 53 3 46 4 54 4 47 3 55 5 48 2 56 6 49 1 57 7 50 0 Default 58 8

Direction Setting

51 1

Moves in direction “a” (towards the Original Width Scale)

Deviation

(mm)

Direction

Moves in direction “b” (towards the Take-Up Mechanism)

D-15

2-10. Adjustment of Document Stopper Solenoid SOL1

1. Remove the Document Take-Up Unit Assy and place it on a table upside down.

2. Loosen two screws and bring the brush (marked “A” in the figure) of the Document Stopper Guide Plate into contact with the Take-Up Roller.

3. While pressing the Document Stopper Guide Plate against the Take-Up Roller gently, lift the solenoid by holding the two screws until it comes to a stop, then tighten the screws.

4486D018AA

Note

After completion of adjustment, lift the Document Stopper Guide Plate to check that the Guide Plate is supported smoothly by the retaining force of the solenoid.

D-16

2-11. Adjustment of Document Pressure Solenoid SOL2

Requirement

The clearance between the Guide Plate and Wei ght Le v er should be appro x imately 2 ± 1

•

mm.

1. Remove the Document Take-Up Unit Assy, and place it on a table.

2. Loosen two screws.

3. While pushing the Plunger towards the Solenoid (up to the position at which the Plunger stops), move the Solenoid so that the clearance between the Guide Plate and Weight Lever is within the specified range.

Note

When moving the Solenoid, make sure that the Plunger is pushed towards the Solenoid and that there is no play between the Plunger and Weight Lever.

D-17

4486D019AA

4486D020AA

2-12. Adjustment of Scale Solenoid SOL3

Requirement

The exposed end of the Stopper Lever is positioned within approximately 8.7 ± 0.2 mm in

•

length.

1. Remove the Turnover/Exit Unit Assy and place it on a table upside down.

2. Loosen two screws.

3. Move the Solenoid up and down so that the exposed end of the Stopper Lever is within the specified length.

4. Tighten the two screws.

D-18

4486D021AA

4486D022AA

2-13. Adjustment of Turnover/Exit Switching Solenoid SOL4

1. Remove the Turnover/Exit Unit Assy and place it on a table.

2. With sponge fitted to the Turnover/Exit Cover in contact with the Turnover/Exit Switching Plate, move the solenoid to the right and left to obtain a clearance “0” at part A shown in the figure, move the solenoid to the right or left so that the gap indicated by “A” in the figure is eliminated.

3. Tighten the two screws.

4486D023AC

Sponge

4486D024AC

D-19

2-14. Adjustment of the Separating Pressure of Document

Separator Pad

1. Remove the Take-Up Unit Cover.

2. Loosen each screw and tighten it to an appropriate level.

Note

Make sure that the separating pressure of both pads is the same.

4486D025AA

D-20

2-15. Adjustment of the Distance Between Separator Rollers

Requirement

When the 2nd Separator Guide Plate is lowered, one sheet of paper can pass through,

•

but not two, so that two sheets of paper are properly separated from each other.

1. Open the Take-Up Cover and loosen the two screws on the 2nd Separator Guide Plate.

2. Cut out two pieces of paper, each measuring about 200 mm by 50 mm, and insert one each between the guide plate and the roller from the take-up end as you turn the roller.

4474D004AA

3. While holding down the 2nd Separator Guide Plate mounting bracket so that the spring tension from the bracket acts on the paper uniformly on the front and rear sides, hold the guide plate in position and, at the same time, tighten the two scerws.

4474D005AA

4474D001AA

D-21

4. Remove the paper. Place one piece of paper on top of another and place the t wo pieces of paper at the separating position from the take-up end.

5. Tur n the Separator Rollers and check that the two pieces of paper are properly separated from each other by the guide plate and only one piece of paper is taken up and fed in. Make this check for the front and rear Separator Rollers.

Note

If two pieces of paper are taken up and fed in, or if the Separator Rollers are in contact with the 2nd Separator Guide Plate when they are turned with no paper placed, start the procedure over beginning with step 2.

4477D003AA

6. Loosen the two screws on the mounting bracket. Raise t he mounting brac k et as far as it will go and, keeping the bracket in that position, tighten the two screws.

7. Loosen the two screws that secure the 2nd Separator Guide Plate in position. Raise the guide plate as far as it will go and, keeping the plate in that position, tighten the two screws.

4474D006AA

4474D007AA

D-22

1. Open the Take-Up Cover and loosen the two screws on the 2nd Separator Guide Plate mounting bracket and 2nd Separator Guide Plate.

2. Cut out two pieces of paper, each measuring about 200 mm by 50 mm, and insert one each between the guide plate and roller from the take-up end as you turn the roller.

4474D009AA

4474D001AA

3. Apply the tip of a flat-blade screwdriver to the center of the mounting bracket.

4. Lightly pushing the screwdriver down from the above (with a for ce equivalent to spring tension), tighten the two screws on the guide plate.

4474D008AA

D-23

5. Remove the paper. Place one piece of paper on top of another and place the t wo pieces of paper at the separating position from the take-up end.

6. Tur n the Separator Rollers and check that the two pieces of paper are properly separated from each other by the guide plate and only one piece of paper is taken up and fed in. Make this check for the front and rear Separator Rollers.

Note

4474D003AA

7. Loosen the two screws on the mounting bracket. Raise t he mounting brac k et as far as it will go and, keeping the bracket in that position, tighten the two screws.

8. Loosen the two screws that secure the 2nd Separator Guide Plate in position. Raise the guide plate as far as it will go and, keeping the plate in that position, tighten the two screws.

4474D006AA

4474D007AA

D-24

TROUBLESHOOTING

General Precautions CAUTION

1. When servicing the DF-724 with its covers removed, use utmost care to prevent your hands, clothing and tools from being caught in revolving parts.

2. Before attempting to replace parts and unplugging connectors, make sure that no power is being supplied from the copier.

Important

1. When creating a closed circuit and measuring a voltage across connector pins specified in the text, be sure to use the green wire (GND).

2. Keep all disassembled parts in good order and keep tools under control so that none will be lost or damaged.

Reading the Text

1. If a component on a PWB or any other functional unit including a motor is defective, the text only instructs you to replace the whole PWB or functional unit and does not give troubleshooting procedure applicable within the defective unit.

2. The text assumes that there are no breaks in the harnesses and all connectors are plugged into the right positions.

1 MISFEED DETECTION

•

Misfeed at the ADF Take-Up/Single Feed Section

Description Detection Timing

Document not reaching Registration Sensor (PWB-B)

Take-Up Motor (M1) malfunction

•

Misfeed at the Transport Section

Description Detection Timing

Document staying at Registration Sensor (PWB-B)

Document staying on Glass (before operation)

Document staying on Glass (after operation)

•

Misfeed at the Turnover/Exit Section

Description Detection Timing

Document not reaching Exit Sensor (PWB-E) (during ejection/turnover)

Document staying at PWB-E (during ejection)

Document staying at PWB-E (durin g turnover)

PWB-B is not activated within a given period time after Take-Up Motor (M1) is energized.

Document Feed Pulse Sensor (M1CLK) is not activated within a given period time after M1 is energized.

PWB-B is not activated even if the next document has reached the scan position.

A sensor indicates that there is still a document in the document path when the next document is placed on the Document Feed Table and all covers are closed.

Exit Sensor (PWB-E) is activated when a 1st document is taken up and fed in.

S4 is not activated within a given period time after Turnover/Exit Motor (M3) is energized.

PWB-E S4 is not deactivated within a given period time after PWB-E is activated.

T-1

2 TROUBLESHOOTING PROCEDURE

1. Mis-feed at the ADF Take-Up Section

Symptom

•

The document is not taken up at all.

Step

No.

1 Does the document used meet

the specifications for reliable feeding?

2 Has the capacity of the Docu-

ment Feed Table been exceeded?

3 Are any of the Document Take-

Up Rollers, Document Separator Rollers and Document Separator Pads deformed, worn or dirty with paper dust?

4 Carry out the unit test for the

Document Pressure Solenoid (SOL2) to check whether it functions properly .

5 Does the voltage across CN9-2

on PWB-A and GND change from 24 VDC when the Start key is pressed?

6 Carry out the unit test for the

Document Stopper Solenoid (SOL1) to check whether it functions properly .

7 Does the voltage across CN12-3

on PWB-A and GND change from 24 VDC to 0 VDC instantaneously and then return to 24 VDC when the Start key is pressed?

8 Carry out the unit test for the

Document Feed Motor Pulse Sensor (M1CLK) to check whether it functions properly.

9 Does the voltage across CN5-3

on PWB-A and GND change to “H” when M1CLK is blocked and change to “L” when M1CLK is unblocked, when the pulse disk is turned by hand?

10 Carry out the unit test for the

Take-Up Motor (M1) to check whether it functions properly.

Check Item Result Action

NO Instruct the user to

use documents that meet the specifications for reliable feeding.

YES Instruct the user

not to exceed the capacity.

YES Clean or replace

them.

YES Carry out step 6.

YES Replace SOL2.

NO Replace PWB-A.

YES Carry out step 8.

YES Replace SOL1.

NO Replace PWB-A.

YES Carry out step 10.

YES Replace PWB-A.

NO Replace.

YES Check each gear

for damage.

T-2

Symptom Step

•

The document is not taken up at all.

•

The panel indicates a misfeed in the ADF when the Start key is pressed, though no documents are placed on the Document Feed Table.

•

The document is not taken up in single feed mode.

No.

Check Item Result Action

11 Does the voltage across CN6-1

on PWB-A and GND change from 24 VDC when the Start key is pressed?

1 Does the actuator of the Docu-

ment Detecting Sensor (S1) function properly?

2 Carry out the unit test for S1 to

check whether it functions properly.

3 Does the voltage across CN3-12

on PWB-A and GND change from 5 VDC to 0 VDC when the actuator is lifted by hand?

1 Does the actuator of the Manual

Document Detecting Sensor (PWB-D) function properly?

2 Carry out the unit test for PWB-D

to check whether it functions properly.

3 Does the voltage across CN5-9

on PWB-A and GND change from 5 VDC to 0 VDC when the light is blocked with a piece of paper?

4 Is the tension of the Timing Belt

correct and the Manual Feed Transport Roller clean?

YES Replace M1.

NO Replace PWB-A.

NO Repair or replace

the actuator.

YES Check the copier.

YES Replace PWB-A.

NO Replace S1.

NO Repair or replace

the actuator.

YES Go to step 4.

YES Replace PWB-A.

NO Replace PWB-D.

YES Adjust the tension

and clean or replace the Roller.

T-3

2. Mis-feed at the ADF Transport Section

Symptom

•

The document has stopped near the Registration Roller.

Step

No.

1 Does the document used meet

the specifications for reliable feeding?

2 Is the Registration Roller

deformed, worn or dirty?

3 Are there any problems along the

document path between the Registration Roller and Transport Belt?

4 Is the Transport Belt installed

properly?

5 Is the Transport Belt deformed,

worn or dirty?

6 Carry out the unit test for the

Registration Sensor (PWB-D) to check whether it functions properly.

7 Does the voltage across CN5-5

on PWB-A and GND change from “H” to “L” when the light is blocked with a piece of paper?

8 Is the tension of the Timing Belt

correct?

Check Item Result Action

NO Instruct the user to

use documents that meet the specifications for reliable feeding.

YES Clean the Regis-

tration Roller.

YES Clean, repair or

replace the transport path.

NO Install it properly.

YES Clean or repair the

Belt.

YES Go to step 8.

YES Replace PWB-A.

NO Replace PWB-B.

NO Adjust the tension

of the Timing Belt.

T-4

3. Mis-feed at the ADF Transport Section

Symptom

•

The document is caught by the Original Width Scale.

•

The document has slipped between the Original Glass and Original Width Scale.

•

The document gets caught behind the Transport Belt (2-sided mode).

•

The document has stopped near the Turnover/Exit Sensor (PWB-D).

Step

No.

1 Does the document used meet

the specifications for reliable feeding?

2 When the Original Width Scale is

pushed and released by hand, does it return to the correct position by the force of the spring?

3 Carry out the unit test for the

Scale Solenoid (SOL3) to check whether it functions properly.

4 After start of transport, does the

voltage across CN4-2 of PWB-A and GND change from “H” to “L”?

5 Is the Transport Belt deformed,

worn or dirty?

1 Carry out the unit test for PWB-D

to check whether it functions properly.

2 Does the voltage across CN11-6

on PWB-A and GND change from “H” to “L” when PWB-D is blocked with a piece of paper?

3 Is the Turnover/Exit Roller

deformed, worn or dirty?

Check Item

Result

NO Instruct the user to

NO Check the mount

YES Go to step 5.

YES Replace SOL3.

NO Replace PWB-A.

YES Clean or replace it.

YES Go to step 3.

YES Replace PWB-A.

NO Replace PWB-D.

YES Clean.

Action

use documents that meet the specifications for reliable feeding.

position of the spring at the bottom of the Original Width Scale. Replace the spring.

T-5

4. Misfeed Detected When Documents are Loaded

Symptom

•

The panel indicates a misfeed in the ADF when a document is placed on the Document Feed Table.

Step

No.

1 Is there still a document in the

ADF?

2 Carry out the unit test for the

Registration Sensor (PWB-B) to check whether it functions properly.

3 Does the voltage across CN5-5

on PWB-A and GND change from “H” to “L” when the light is blocked with a piece of paper?

4 Carry out the unit test for the Size

Sensor (PWB-C) to check whether it functions properly.

5 Does the voltage across CN3-3,

3-4 and 3-5 on PWB-A and GND change from 5 VDC to 0 VDC when the light is blocked with a piece of paper?

6 Does the actuator of PWB-C

operate properly?

Check Item Result Action

YES Remove the docu-

ment.

YES Go to step 4.

YES Replace PWB-A.

NO Replace PWB-B.

YES Go to step 6.

YES Replace PWB-A.

NO Replace PWB-C.

YES Repair or replace

the actuator.

T-6

MAINTENANCE

SCHEDULE

DF-724

NOTE1: Replace the parts marked with * at the same time.

NOTE2: During regular maintenance visit, clean or replace parts as necessary.

NOTE3: K=1,000 originals

PM Parts

Maintenance Cycle (K)

Parts No. QTY Reference Page

C R

Document (*)

Take-Up Roller/Separator Roller

30 120 11UP45170 4 D-3

Document (*)

Take-Up Roller

30 120 11UP45180 1 D-3

Document (*)

Separator Pad

30 120 11UP45490 2 D-4

Registration

Drive Roller

30 — — 1 —

Registration

Driven Roller

30 — — 2 —

Turnover/Exit Roller 30 — — 1 —

Turnover/Exit Roll 30 — — 4 —

Document

Transport Belt

30 — — 1 D-2

Registration

Sensor

120 — — 1 —

WIRING

DIAGRAMS

W-1

W-2

PARTS CATALOG

Model

DF-724

FEBRUARY 1999

KONICA BUSINESS TECHNOLOGIES, INC.

How to use this catalog

This parts catalog includes illustrations and part numbers for all replacement parts and assemblies used in this model.

Model-specific parts are identified in the illustrations with reference numbers. Use the reference number to locate the corresponding part number on the facing page.

Common hardware items, such as screws, nuts, washers, and pins, are identified in the illustrations with reference letters. Use the reference letter to locate the corresponding part number on the hardware listing in the lower right hand corner of the facing page.

If you know a part number, but don’t know where the part is used, use the numerical index to determine the page number and reference number for that part. Because some common parts are used in several places, there may be more than one entry. Refer to the illustrations to see where the part may be used.

If you know a part’s description, but don’t know where to look to find the part number, use the alphabetical index to determine likely page and reference numbers. Then look at the illustrations to determine that you have identified the correct part. Locate the part number using the listing on the opposite page.

Retail pricing that appears with the numerical index, while valid when this catalog was printed, is subject to change without notice. The prices are only suggested prices and are provided only for reference. Dealers may determine their own selling prices. For up-to-date pricing, refer to current Konica price lists or contact the Konica Parts Distribution Center.

How to order parts

Use standard Konica parts ordering procedures to obtain these parts. For ordering options, contact Konica’s Parts Distribution Center.

When ordering parts, be sure to specify part numbers exactly as listed in this catalog.

NOTE: Electrical parts may include previously used components.

Model DF-724 Konica Business Technologies, Inc. Page iii

1st Edition February, 1999

This page left blank intentionally.

Page iv Konica Business Technologies, Inc. Model DF-724

February, 1999 1st Edition

How to use this catalog . . . . . . . . . . . . . . . . . . . . . . . . . iii

Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Machine parts

Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Paper Takeup Section (A) . . . . . . . . . . . . . . . . . . . . 4

Paper Takeup Section (B) . . . . . . . . . . . . . . . . . . . . 8

Paper Takeup Section (C) . . . . . . . . . . . . . . . . . . . 10

Paper Transport Section . . . . . . . . . . . . . . . . . . . . 14

Exit Section (A) . . . . . . . . . . . . . . . . . . . . . . . . 16

Exit Section (B) . . . . . . . . . . . . . . . . . . . . . . . . 18

Alphabetical index . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Numerical index, Retail price list . . . . . . . . . . . . . . . . . . . . 23

Model DF-724 Konica Business Technologies, Inc. Page 1

1st Edition February, 1999

Housing

Page 2 Konica Business Technologies., Inc. Model DF-724

February, 1999 1st Edition

REF. PART NUMBER DESCRIPTION

NO.

1 11UP90010 Harness 2 11UP90020 Harness 3 11UP-9510 IC 4 11UP83010 Fuse 5 11UP-9010 PW Board (A) 6 11UP90030 Harness 7 11UP10010 Bracket 8 11UP10020 Ground wire

9 11UP10030 Hinge 10 12ZL10550 Shoulder screw 11 11UP10040 Stopper 12 11UP10050 Lower cover 13 11UP10060 Plate 14 11UP10070 Cover 15 11UP10080 Positioning plate 16 11UP12010 Top cover 17 11UQ10090 Scale 18 11UP12020 Stopper 19 11UP12030 Tray 20 11UP12040 Polyester film 21 11UP12050 Guide plate 22 11UP97010 Label 23 11UP97020 Label (Do Not Exceed) 24 11UP12060 Tray 25 11UP12070 Cover 26 11UP12080 Pad 27 11UP12090 Polyester film 28 11UP10100 Bracket 29 11UP10110 Reinforce plate

HARDWARE

REF. LTR.

a 25TU02310 b 11UP02020 c 11UP01470 d 25TU01520 e 25TU02210 f 25TU01810 g 25TU03420

PART

NUMBER

Model DF-724 Konica Business Technologies., Inc. Page 3

1st Edition February, 1999

Paper Takeup Section (A) - 1

Page 4 Konica Business Technologies., Inc. Model DF-724

February, 1999 1st Edition

REF. PART NUMBER DESCRIPTION

NO.

1 11UP10120 Rear frame

2 11UP75010 Bushing

3 11UP77010 Gear (Z=19)

4 11UP77020 Gear (Z=38)

5 11UP10130 Bracket

6 11UP90040 Harness

7 11UP10140 Shaft

8 11UP77030 Ply gear (Z=23,60,15)

9 11UP76510 Tension pulley 10 11UP10150 Axle plate 11 11UP77510 Timing belt 12 11UP10160 Shaft 13 11UP77520 Timing belt 14 11UP77530 Timing belt 15 11UP76520 Pulley (Z=18) 16 11UP10170 Tension spring 17 11UP10180 Lever 18 11UP85010 Photosensor 19 11UP10190 Tension spring 20 11UP10200 Plate 21 11UP10210 Stopper 22 11UP10220 Axle plate 23 11UP10230 Shoulder screw 24 11UP10240 Tension spring 25 11UP80010 Motor 26 11UP10250 Cushion 27 11UP90050 Harness 28 11UP80020 Motor 29 11UP10260 Bracket 30 11UP10270 Retaining ring

HARDWARE

REF. LTR.

PART

NUMBER

a 25TU01440 b 25TU02450 c 25TU02410 d 25TU01460 e 11UP01470 f 25TU01610 g 25TU01470 h 25TU03420 j 11UP03630 k 11UP03660 m 11UP03520 n 11UP03670 p 25TU03210 q 25TU03620 r 25TU01160 s 11UW01210 t 11UP03510 u 25TU02460

Model DF-724 Konica Business Technologies., Inc. Page 5

1st Edition February, 1999

Paper Takeup Section (A) - 2

Page 6 Konica Business Technologies., Inc. Model DF-724

February, 1999 1st Edition

REF. PART NUMBER DESCRIPTION

NO.

31 11UP82010 Solenoid 32 11UP10280 Hinge 33 11UP10020 Ground wire 34 11UP10300 Bracket 35 11UP10310 Pressure spring 36 11UP10320 Collar 37 11UP10330 Button 38 12ZL10550 Shoulder screw 39 12ZL10580 Positioning plate 40 11UP10340 Lever 41 11UP10350 Ground wire 42 11UP10360 Lever 43 11UP10370 Polyester film 44 11UP10380 Polyester film 45 11UP10390 Cover 46 11UP10400 Lever 47 11UP10410 Polyester film 48 11UP10420 Shaft 49 11UP10430 Axle plate 50 11UP10440 Weight 51 11UP10450 Pressure spring 52 11UP10460 Cushion 53 11UP10470 Lock plate 54 11UP10480 Cushion 55 11UP10490 Tension spring 56 11UP10500 Shoulder screw 57 11UP10510 Guide plate 58 11UP10520 Separator 59 11UP10530 Guide plate 60 11UP10540 Front frame 61 11UP10550 Lever 62 11UP10560 Bracket 63 11UP10570 Plate 64 11UP85020 Photosensor 65 11UP10580 Plate 66 11UP10590 Tension spring 67 11UP10600 Adjusting plate 68 11UP85030 Switch

HARDWARE

REF. LTR.

PART

NUMBER

Model DF-724 Konica Business Technologies., Inc. Page 7

1st Edition February, 1999

Paper Takeup Section (B)

Page 8 Konica Business Technologies., Inc. Model DF-724

February, 1999 1st Edition

REF. PART NUMBER DESCRIPTION

NO.

1 11UP45010 Guide plate (U)

2 11UP45020 Roll

3 11UP45030 Shaft

4 11UP45040 Polyester film

5 11UP45050 Polyester film

6 11UP45060 Tension spring

7 11UP45070 Lever

8 11UP90060 Harness

9 11UP45080 Joint 10 11UP82020 Solenoid 11 11UP77050 Gear (Z=21) 12 11UP75010 Bushing 13 11UP77060 Gear (Z=19) 14 11UP-9020 PW board (B) 15 11UP45090 Cover 16 11UP45100 Holder 17 11UP45110 Polyester film 18 11UP45120 Shaft 19 11UP45130 Bracket 20 11UP45140 Plate 21 11UP45150 Shaft 22 11UP45160 Shaft 23 11UP45170 Roller 24 11UP45180 Roller 25 11UP45190 Collar 26 11UP45200 Pad 27 11UP45210 Guide plate (L) 28 11UP45220 Cushion 29 11UP45230 Shutter 30 * Not used 31 11UP45240 Holder 32 11UP45250 Stopper ring 33 11UP45260 Tension spring 34 11UP45270 Shaft 35 11UP45280 Lever 36 11UP45290 Bracket 37 11UP90070 Harness 38 11UP45300 Shoulder screw 39 11UP45310 Stopper 40 11UP45320 Tension spring 41 11UP-9040 PW board (C) 42 11UP45330 Polyester film

HARDWARE

REF. LTR.

a 25TU01440 b 25TU01460 c 25TU01470 d 25TU02410 e 11UP02040 f 11UP01120 g 11UP03630 h 11UP03670 j 11UW01210 k 11UP03660 m 11UP03610

PART

NUMBER

Model DF-724 Konica Business Technologies., Inc. Page 9

1st Edition February, 1999

Paper Takeup Section (C) - 1

Page 10 Konica Business Technologies., Inc. Model DF-724

February, 1999 1st Edition

REF. PART NUMBER DESCRIPTION

NO.

1 11UP45340 Tray

2 11UP45350 Plate

3 11UP75060 Bushing

4 11UP45360 Guide

5 11UP45370 Holder

6 11UP45380 Label

7 11UP45390 Pressure spring

8 11UP45400 Shaft

9 11UP45410 Support plate 10 11UP45420 Shoulder screw 11 11UP45430 Hinge 12 11UP76550 Pulley 13 11UP76560 Pulley (Z=20) 14 25TU75440 Ball bearing 15 11UP45440 Tension spring 16 11UP75070 Bushing 17 11UP45450 Polyester film 18 11UP45460 Polyester film 19 11UP45470 Pressure spring 20 11UP45480 Polyester film 21 11UP45490 Separator pad 22 11UP45500 Polyester film 23 11UP45510 Roller 24 11UP45520 Polyester film 25 11UP45530 Seal 26 11UP45540 Torsion spring 27 11UP45550 Lever 28 11UP45560 Tension spring 29 11UP-9050 PW board (D) 30 11UP45570 Polyester film

HARDWARE

REF. LTR.

PART

NUMBER

a 25TU02410 b 25TU01450 c 25TU02210 d 11UP03630 e 11UP03670 f 11UP03640 g 11UP03660 j 25TU01230 k 25TU03620 m 25TU01440

Model DF-724 Konica Business Technologies., Inc. Page 11

1st Edition February, 1999

Paper Takeup Section (C) - 2

Page 12 Konica Business Technologies., Inc. Model DF-724

February, 1999 1st Edition

REF. PART NUMBER DESCRIPTION

NO.

31 11UP45580 Lever 32 11UP45590 Holder 33 11UP45600 Spacer 34 11UP45610 Pressure spring 35 11UP45620 Bracket 36 11UP45630 Shaft 37 11UP45640 Roller 38 11UP45650 Pressure spring 39 11UP45660 Tension spring 40 11UP45670 Roller 41 11UP45680 Guide plate 42 11UP45690 Guide 43 11UP77070 Gear (Z=30) 44 11UP45700 Tension spring 45 11UP77080 Gear (Z=16) 46 11UP97050 Label (F3) 47 11UP45710 Polyester film 48 11UP45720 Roller 49 11UP45730 Guide plate 50 11UP45740 Guide plate 51 11UP45750 Pressure spring 52 11UQ45760 Scale 53 11UP75080 Bushing 54 11UP45770 Regulating plate 55 11UP45780 Pad 56 11UP45790 Tray 57 11UP45800 Shoulder screw 58 11UP45810 Cover 59 11UP45820 Magnet 60 11UP45830 Shoulder screw 61 11UP45840 Polyester film 62 11UP45850 Polyester film 63 11UP45860 Flange 64 11UP45870 Washer 65 11UP45880 Spacer 66 11UP45890 Polyester film 67 11UP45900 Polyester film

HARDWARE

REF. LTR.

a 25TU02410 b 25TU01450 c 25TU02210 d 11UP03630 e 11UP03670 f 11UP03640 g 11UP03660 j 25TU01230 k 25TU03620 m 25TU01440

PART

NUMBER

Model DF-724 Konica Business Technologies., Inc. Page 13

1st Edition February, 1999

Paper Transport Section

Page 14 Konica Business Technologies., Inc. Model DF-724

February, 1999 1st Edition

REF. PART NUMBER DESCRIPTION

NO.

1 12ZL11450 Transport

2 12ZL11460 Spacer

3 12ZL75080 Ball bearing

4 12ZL11470 Plate

5 12ZL11480 Guide

6 12ZL11490 Rear frame

7 12ZL11500 Shoulder screw

8 12ZL11640 Pressure spring

9 12ZL11630 Reinforce plate 10 12ZL11650 Arm 11 12ZL11570 Roll 12 11UP45920 Roller 13 12ZL11540 Reinforce plate 14 12ZL11510 Bracket 15 12ZL11520 Tension (B) spring 16 12ZL75090 Bushing 17 12ZL11580 Roller 18 12ZL11530 Guide 19 12ZL11550 Tension spring 20 12ZL11560 Arm 21 11UP45930 Roller 22 11UP45940 Frame 23 12ZL11590 Bracket 24 12ZL11600 Stopper ring 25 11UP45950 Bracket 26 11UP45960 Magnet catch 27 11UP10230 Shoulder screw 28 11UP45980 Bracket 29 12ZL75070 Ball bearing 30 11UP77090 Gear (Z=23)

HARDWARE

REF. LTR.

PART

NUMBER

a 25TU02640 b 25TU01520 c 25TU01450 d 11UP01520 e 25TU03630 f 11UM03510 g 25TU01250

Model DF-724 Konica Business Technologies., Inc. Page 15

1st Edition February, 1999

Exit Section (A)

Page 16 Konica Business Technologies., Inc. Model DF-724

February, 1999 1st Edition

REF. PART NUMBER DESCRIPTION

NO.

1 11UP46010 Rear frame

2 11UP46020 Bracket

3 11UP46030 Ground plate

4 11UP46040 Pin

5 11UP46050 Cover

6 11UP46060 Pressure spring

7 11UP46070 Shaft

8 11UP46080 Neutralizing brush

9 11UP46090 Roller 10 11UP46100 Shaft 11 11UP46110 Plate spring 12 11UP46120 Polyester film 13 11UP46130 Guide 14 11UP45530 Seal 15 11UP46150 Guide plate 16 11UP46160 Roller 17 11UP46170 Plate spring 18 11UP46180 Roller 19 11UP46190 Rubber foot 20 11UP46200 Axle plate 21 11UP46210 Magnet 22 11UP46220 Holder 23 11UP46230 Front frame 24 11UP46240 Bracket 25 11UP46250 Collar 26 11UP46260 Polyester film 27 11UP46270 Rubber strip 28 11UP46280 Plate 29 11UP46290 Bracket 30 11UP46300 Lever

HARDWARE

REF. LTR.

PART

NUMBER

a 25TU02410 b 25TU02450 c 25TU02640 d 25TU02430 e 25TU02210 f 25TU01880 g 25TU01710 h 11UP03520 j 11UM01260 k 11UP03610

Model DF-724 Konica Business Technologies., Inc. Page 17

1st Edition February, 1999

Exit Section (B)

Page 18 Konica Business Technologies., Inc. Model DF-724

February, 1999 1st Edition

Konica Minolta DF-724 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

CONTENTS

SAFETY PRECAUTIONS

1 SPECIFICATIONS

2 COMPONENTS IDENTIFICATION

3 CROSS-SECTIONAL VIEW

4 DRIVE SYSTEM

5 ELECTRICAL COMPONENT LAYOUT

6 DESCRIPTION OF MODES

7 DOCUMENT TAKE-UP/FEEDING MECHANISM

8 DOCUMENT TRANSPORT MECHANISM

9 TURNOVER/EXIT MECHANISM

10 MISCELLANEOUS

TEST MODES

1 TEST MODES

1 DISASSEMBLY

2 ADJUSTMENTS

TROUBLESHOOTING

1 MISFEED DETECTION

2 TROUBLESHOOTING PROCEDURE

Contents

Housing

Paper Takeup Section (B)

Paper Transport Section

Exit Section (A)

Exit Section (B)