Konica Minolta ST-723, ST-724 User Manual

SERVICE MANUAL

Models

ST-723/724

FEBRUARY 1999

CSM-ST723/724

KONICA BUSINESS TECHNOLOGIES, INC.

ST-723/724

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. PARTS IDENTIFICATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . M-2

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

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

5. ELECTRICAL COMPONENTS LAYOUT. . . . . . . . . . . . . . . . . . . . M-5

6. OUTLINE OF OPERATION IN EACH MODE

6-1. INITIAL OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . M-6

6-2. NON-SORT MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . M-6

6-3. SORT MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . M-7

6-4. GROUP MODE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . M-9

6-5. SORT STAPLE MODE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . M-10

6-6. MANUAL STAPLE MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . M-11

6-7. BIN MOVEMENT AT END OF COPY CYCLE . . . . . . . . . . . . M-11

7. OPERATION OF EACH MECHANISM

7-1. PAPER TRANSPORT MECHANISM . . . . . . . . . . . . . . . . . . . M-12

7-2. PAPER ALIGNING MECHANISM. . . . . . . . . . . . . . . . . . . . . . M-13

7-3. BIN MOVING MECHANISM . . . . . . . . . . . . . . . . . . . . . . . . . . M-17

7-4. PAPER CLAMPING MECHANISM . . . . . . . . . . . . . . . . . . . . . M-21

7-5. PAPER DETECTION AT STAPLING MECHANISM . . . . . . . M-25

7-6. STAPLING MECHANISM . . . . . . . . . . . . . . . . . . . . . . . . . . . . M-25

7-7. SORTER SET SWITCH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . M-35

7-8. BIN EMPTY DETECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . M-36

8. OPERATION IN EACH MODE

8-1. NON-SORT MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . M-37

8-2. SORT MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . M-38

8-3. GROUP MODE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . M-40

8-4. SORT STAPLE MODE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . M-42

iii

CONTENTS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-1

TEST MODE

DIS/REASSEMBLY, ADJUSTMENT

1. DISASSEMBLY/REASSEMBLY

1-1. REMOVAL OF EXTERIOR COVERS. . . . . . . . . . . . . . . . . . . D-1

1-2. REMOVAL OF THE TRANSPORT GUIDE PLATE ASSY . . D-2

1-3. REMOVAL OF THE BIN MOVING MOTOR M1 UNIT . . . . . . D-3

1-4. REMOVAL OF PAPER CLAMP SOLENOID SL1 . . . . . . . . . D-4

1-5. REMOVAL OF THE STAPLE UNIT . . . . . . . . . . . . . . . . . . . . D-4

1-6. REMOVAL OF THE SORTER LOCK RELEASE LEVER . . . D-5

1-7. REMOVAL OF THE BINS . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-6

2. ADJUSTMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-9

TROUBLESHOOTING

1. MISFEED DETECTION/TROUBLESHOOTING PROCEDURES

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

1-2. TROUBLESHOOTING PROCEDURES . . . . . . . . . . . . . . . . . T-1

2. MALFUNCTION DETECTION/TROUBLESHOOTING PROCEDURES

2-1. MALFUNCTION DETECTION. . . . . . . . . . . . . . . . . . . . . . . . . T-3

2-2. TROUBLESHOOTING PROCEDURES . . . . . . . . . . . . . . . . . T-5

◆ELECTRICAL WIRING DIAGRAM

◆ELECTRICAL CIRCUIT DIAGRAM

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

SPECIFICATIONS

Type : 10-Moving-Bin Sorter (ST-723)

10-Moving-Bin Sorter with Automatic Stapler (ST-724) Installation : Appendant to copier No. of Bins : 11 Modes : Non-Sort

Sort

Group

Sort Staple ST-724 only

Manual Staple ST-724 only

*1: Not available for an ST-724 mounted together with

an DF-723.

*2: Available only for a system equipped also with an

DF-723.

In the Non-Sort Mode

Copy Medium : Recommended paper weighing 60 to 90 g/m

24 lbs., translucent paper, transparencies, heavy paper

(91 to 157 g/m

or 25 to 41 lbs.).

Size : A5 lengthwise to A3, and A3 Wide or 5-1/2"

× 17" and Full Bleed

Max. Capacity : Recommended paper : 1st Bin - 50

11"

(80 g/m

or 22 lb.) : 2nd to 10th Bin - 25/Bin : Transparencies: 10 (max. size: A4 or 8-1/2" : Other special paper: 10

or 16 to

× 8-1/2" to

× 11")

In the Sort/Group Mode

Copy Medium : Recommended paper weighing 60 to 80 g/m

or 16 to

22 lbs. Size : A5 lengthwise to A3, 5-1/2" Max. Capacity : 25 sheets of 80 g/m

In the Sort Staple Mode

Copy Medium : Recommended paper weighing 60 to 80 g/m

× 8-1/2" to 11" × 17"

or 22 lb. paper per Bin

or 16 to

22 lbs. Size : A4 to A3, 8-1/2" Max. Capacity : 25 sheets of 80 g/m No. of Copies That Can

: 2 to 25 copies of 80 g/m

× 11" to 11" × 17"

or 22 lb. paper per Bin

or 22 lb. paper

be Stapled

Power Requirement : DC24V (supplied from copier) Power Consumption : 72W or less Dimensions : Width - 400 mm or 15-3/4"

Depth - 562 mm or 22-1/4"

Height - 404 mm or 16" Weight : ST-723 - 15.8 kg or 34-3/4 lbs. (excl. Mounting Bracket)

ST-724 - 18.1 kg or 40 lbs. (excl. Mounting Bracket) Environmental

: Same as copier

Requirements

M-1

PARTS IDENTIFICATION

1. Sorter Lock Release Lever

2. Hookup Connector

3. Sorter Lock Lever

4. Drive Coupling Gear

5. Transport Guide Plates

6. Sorter Set Detector

7. Stapler Cover (Cannot be opened on ST-723)

4428M060AA

4428M061AA

8. 1st to 10th Bins

9. Top Bin

10. Paper Aligning Bar (ST-724 only)

11. Mounting Bracket

M-2

CROSS-SECTIONAL VIEW

1. 1st to 10th Bins

2. Top Bin

3. Spiral Cam

4. Bin Empty Sensor LED Board PWB-B

5. Sorter Lock Release Lever

6. Bin Upper Limit Interlock Switch S1

7. Sorter Lock Lever

8. Sorter Exit Sensor PC2

9. Bin Lower Limit Interlock Switch S2

10. Bin Lower Limit Position Sensor PC4

11. Bin Empty Sensor PQ Board PWB-C

M-3

DRIVE SYSTEM

Belt 1 P1

GP1

Belt 3

Belt 4

Belt 2

GP2

Symbol Length

Belt 1 150 mm Belt 2 918 mm Belt 3 160 mm Belt 4 150 mm

Symbol

G1 25/15 G2 36 G3 37 G4 34/16

G5 30 GP1 12/60 GP2 23/19

Gear/Pulley: No. of Teeth

M-4

Symbol

Pulley: No. of Teeth

P1 22 P2 22 P3 28 P4 28 P5 20 P6 20

ELECTRICAL COMPONENTS LAYOUT

SYMBOL PARTS NAME SYMBOL PARTS NAME

PWB-A PWB-B PWB-C M1

∗M2 ∗M3 ∗M4 ∗SL1

PC1 PC2 PC3 PC4

∗ ... ST-724 Only

Control Board Bin Empty Sensor LED Board Bin Empty Sensor PQ Board Bin Moving Motor Paper Clamp Motor Paper Aligning Motor Stapling Motor Paper Clamp Solenoid Bin Moving Pulse Sensor Sorter Exit Sensor Bin Positioning Sensor Bin Lower Limit Position Sensor

∗PC5 ∗PC6 ∗PC8

∗PC10

S1 S2 S3 ∗S4

Paper Aligning Home Position Sensor Paper Clamp Home Position Sensor Paper Clamping Sensor Staple Empty Detecting Sensor Bin Upper Limit Interlock Switch Bin Lower Limit Interlock Switch Sorter Set Switch Stapler Home Position Detecting Switch

M-5

OUTLINE OF OPERATION IN EACH MODE

Repeats for the no. of

copies set to be made.

6-1. INITIAL OPERATION

The following operations are performed sequentially when Sorter Set Switch S3 is first actuated after the Power Switch of the copier has been turned ON. ST-723 performs step

➃ only.

➀ The Paper Aligning Bar is detected at its home position.

(For details, see p. M-14.)

➁ The Paper Clamp Unit is detected at its home position.

(For details, see p. M-22.)

➂ A check is made to ensure that the Stapler Arm is at its home

position. * If not at the home position, the Stapler Arm is moved to the home

* position. (For details, see p. M-27.)

➃ The 1st Bin is detected at the reference position.

(For details, see p. M-19.)

6-2. NON-SORT MODE

When in the Non-Sort Mode, the ST-724/ST-723 feeds all copies out onto the 1st Bin. It feeds copies into the subsequent Bin as soon as the capacity of the current Bin is exceeded. (As soon as 25 copies have been fed into the 10th Bin, the Remove Copies Indicator on the copier control panel lights up and the copier inhibits the initiation of a new copy cycle.)

Example: Making 80 copies

No. of Copies

Bin

Fed In

1st 50 2nd 25 3rd 5

Outline of Operation

Out of Copier

Through

ST-724/ST-723

Fed into 1st Bin

Aligning

End of Operation

…ST-724 only

M-6

When the capacity of the

current Bin is exceeded

Bin Moving

6-3. SORT MODE

● When in the Sort Mode, the ST-724/ST-723 sorts copies into complete

sets of originals, each set being fed out onto a Bin. Sorting is bi-directional: the copies of the odd-numbered originals are sorted in the sequence from the 1st Bin to 10th Bin (the Bins moving upward). Copies of the even-numbered originals are sorted in the sequence from the 10th Bin to 1st Bin (the Bins moving downward).

Example: Making 10 Copies Each from 3 Different Originals

Direction of Bin Moving for Copies of 1st Original

Copy

Direction of Bin Moving for Copies of 2nd Original

● When 25 copies have been fed out into the last Bin, the Remove Copies

Direction of Bin Moving for Copies of 3rd Original

Indicator lights up on the copier control panel and the copier inhibits the initiation of a new copy cycle. If, however, the 6th and subsequent Bins are not used in the Sort Mode (i.e., the number of copies to be made has been set to 5 or less), the Remove Copies Indicator does not light up. Instead, the ST-724/ST-723 is automatically switched to the Auto Dual Mode and copying continues using the 6th and subsequent Bins until the Remove Copies Indicator lights up or the copy cycle is completed.

Example: Making 3 Copies Each from 30 Different Originals

Bin Original

1st

2nd

3rd 6th 7th 8th

1st to 25th 25

26th to 30th 5

No. of Copies Fed Out

M-7

● When the Start Key is pressed with 11 or more set for the number of

Repeats for the no. of

copies set to be made.

copies to be made, the number on the Multi-Copy Display is automatically changed to 10 and the ST-724/ST-723 operates in the Sort Mode.

Outline of Operation

Out of Copier

Through

ST-724/ST-723

Fed into Bin

Aligning

Bin Moving

…ST-724 only

After the last copy has been aligned

End of Operation

M-8

6-4. GROUP MODE

Repeats for the no. of

copies set to be made.

● When in the Group Mode, the ST-724/ST-723 separates copies made

from a single original into groups, each group containing the same, or a different, number of copies.

Example: Making 25 Copies Each from 3 Different Originals

Bin Original

1st 2nd 5 3rd

4th 5

● If the settings on the copier control panel and other conditions require

1st

2nd

No. of Copies Fed Out

more than 10 Bins, during execution of the copy job, the copier stops the initiation of a new copy cycle and the Remove Copies Indicator lights up. If space remains available in the 10th Bin, the Start Key can be pressed again. All copies of the subsequent original or originals are now fed into the 10th Bin. However, as soon as the capacity of the 10th Bin is exceeded, the copier inhibits the initiation of the new copy cycle.

Outline of Operation

Out of Copier

Through

ST-724/ST-723

Fed into Bin

Aligning

End of Operation

…ST-724 only

At the end of the copy cycle for one original

Bin Moving

M-9

6-5. SORT STAPLE MODE (ST-724 ONLY)

Repeats for the no. of

copies set to be made.

● When in the Sort Staple Mode, the ST-724 automatically staples each of

the copy sets sorted into each Bin (the sorting operation is the same as in the Sort Mode).

● Stapling action occurs starting with the lowest Bin in use. (For instance, if

1st to 4th Bins are in use, the copy sets are stapled starting with the 4th Bin.)

● If copies are to be sorted only into the 1st Bin (i.e., when making one copy

each of two different originals), after both copies have been fed into the 1st Bin, the ST-724 moves the Bins to the 2nd Bin position and then back to the 1st Bin position before initiating the stapling action.

● If the ST-724 is switched to the Auto Dual Mode during sorting, it cancels

the stapling action and sets the ST-724 into the Sort Mode.

Outline of Operation

Out of Copier

Through ST-724

Fed into Bin

Aligning

Bin Moving

● Stapling action is inhibited under any of the following conditions even if

the copy cycle has been initiated in the Sort Staple Mode:

After the last copy has been aligned

Bin Moving

Clamping

Stapling

Bin Moving

…If the lowest Bin in

…use is not located to …receive copies

End of Operation

➀ There is a copy or copies present in any of the Bins when the Power

Switch is turned ON and the copy cycle is initiated without having removed it.

➁ The copy cycle is initiated with copies made in a preceding Non-Sort

cycle still in the Bins.

➂ The copy cycle is initiated with paper inserted into the Bin externally. ➃ There is only one copy in the Bin after sorting. ➄ Copies with different crosswise lengths are in the Bins. ➅ The copy set is not properly conveyed to the stapling position because of

a clamping or other failure (in which case, the ST-724 goes on to staple the copy set in the next Bin).

M-10

6-6. MANUAL STAPLE MODE (ST-724 ONLY)

The following two different operations are possible in the Manual Staple Mode.

• When the Manual Staple Key on the copier control panel is pressed after

copies have been made in the Sort or Group Mode, the ST-724 staples together two or more copies in a Bin. (The stapling action and stapling inhibiting conditions are the same as those in the Sort Staple Mode.)

• When there are no copies in any of the Bins, the ST-724 can staple

together sheets of paper inserted into the 1st Bin by hand when the Manual Staple Key on the copier control panel is pressed. At this time, the ST-724 performs no aligning action.

Operation

Press the Manual Staple Key.

Clamping

Stapling

End of Operation

No stapling action occurs if the sheets of paper have not properly been conveyed to the stapling position because of a clamping or other failure.

6-7. BIN MOVEMENT AT END OF COPY CYCLE

If the 1st Bin is not located to receive copies at the end of a copy cycle, the Bins are moved so that the 1st Bin will be located to receive copies 2 sec. after copies have been removed from the Bins. This sets the ST-724/ST-723

M-11

OPERATION OF EACH MECHANISM

7-1. PAPER TRANSPORT MECHANISM

● Paper Path

The paper fed out of the Copier by the Exit Roller in the copier is fed directly onto the Transport Roller in the ST-724/ST-723. The Transport Roller turns to feed the paper almost straight into the Bin. During this time, Sorter Exit Sensor PC2 is unblocked ( ) as the leading edge of the paper moves past it and blocked ( ) as the trailing edge of the

paper moves past it. The paper path is constant, as shown below, regardless of the operating mode selected for use.

Light Blocking Plate

Paper

PC2

Copier

Transport Roller

PC2

● Transport Roller Drive

Exit Roller in Copier

The Transport Roller is driven by the Drive Coupling Gear Assy which receives drive from the Exit Roller Drive Gear inside the copier (or Duplex Unit). This means that the Transport Roller turns in phase with the paper take-up drive of the copier.

= Viewed from Rear of System =

Transport Roller Pulley

Drive Coupling Gear Assy

Timing Belt

Copier

Duplex

Unit

Exit Roller Drive Gear

ST-724/ST-723

Drive Coupling Gear Assy

Transport Roller Pulley

M-12

7-2. PAPER ALIGNING MECHANISM (ST-724 ONLY)

● The Paper Aligning Mechanism presses the copies fed into the Bins up

against the Aligning Reference Plate so that they can be aligned in the crosswise direction. This mechanism will operate only with B5 Lengthwise, 8"

● The copies are aligned by the Paper Aligning Bar which is moved by

× 10" Lengthwise or greater size.

Paper Aligning Motor M3 turning forward or backward. The movement of the Paper Aligning Bar differs depending on the paper size.

Paper Aligning Home Position Sensor PC5

Spiral Shaft

M3 Turning Forward

Paper Aligning Bar

● Paper Aligning Motor M3

M3 Turning Backward

Aligning Reference Plate

Paper Aligning Motor M3 is a two-phase stepping motor. The output pulses from pins 12 to 15 of IC1A are applied via IC6A and IC9A to M3 to control the direction and distance of movement of the Paper Aligning Bar. Each output pulse from IC1A turns M3 one angular increment, or a step, which is 7.5°. This is equivalent in the movement of the Paper Aligning Bar to approx. 0.3 mm. The number of output pulses from IC1A therefore controls the distance of movement of the Paper Aligning Bar. The output sequence of pulse signals (steps 1, 2, 3, and 4 or steps 4, 3, 2, and 1), on the other hand, determines the direction of rotation of M3.

IC1A (Pin No.)

1 2 3 4

12 L L H H 13 H H L L 14 H L L H 15 L H H L

Step

Output Sequence M3 Turning Forward

M3 Turning Backward

M-13

● Paper Aligning Bar Home Position Detection

The home position of the Paper Aligning Bar is where the Light Blocking Plate fitted to the Paper Aligning Bar has just blocked Paper Aligning Home Position Sensor PC5 ( ). This position serves as the reference point, based on which the number of output pulses from IC1A is calculated for different paper sizes.

Operation When Paper Aligning Bar is Detected at its Home Position

➀ M3 is turned backward until

PC5 is blocked.

➁ M3 is turned forward until

PC5 is unblocked.

➂ M3 is turned backward by one

pulse until PC5 is blocked, at which time M3 is deenergized. (See NOTE below.)

➀ M3 is turned forward until

PC5 is unblocked.

➁ M3 is turned backward by one

pulse until PC5 is blocked, at which time M3 is deenergized. (See NOTE below.)

NOTE: CPU checks whether PC5 is blocked or unblocked each time M3 is

The home position of the Paper Aligning Bar is detected under any of the following timings:

energized for one pulse.

• When Sorter Set Switch S3 is turned ON.

• At the end of each mode (when the last copy has been aligned).

M-14

● Outline of Paper Aligning Bar Operation

Home Position

…… The Bar is located near, but not in contact

with, the copy. (See NOTE below.)

…… The Bar presses the copy up against the

Aligning Reference Plate. (See NOTE below.)

NOTE: Varies for different paper sizes.

➀

Standby Position

Aligning Position

➁

Home Position

➀ During a multi-copy cycle, the Paper Aligning Bar repeatedly

moves between the standby and aligning position until it completes aligning the last copy.

➁ The Paper Aligning Bar returns to the home position when it

has completed aligning the last copy.

● Number of Pulses (Paper Aligning Bar Movement) for Different Paper

Sizes

Predetermined No. of Pulses

Paper Size

A3 0 51

× 17" 11 62

11"

8-1/2"

A4L 139 190

From Home to Standby Position

× 11"L 137 188

From Standby to Aligning Position

L: Lengthwise

M-15

● Aligning Operation

Paper Aligning Bar at home position

60 msec. after Sorter Exit Sensor PC2 has been unblocked ( ) as the leading edge of the copy fed out of the copier reaches it

Paper Aligning Motor M3 turns forward for the predetermined number of pulses corresponding to the paper size, thereby moving the Paper Aligning Bar to the standby position.

270 msec. after PC2 has been blocked ( ) as the trailing edge of the copy

moves past it

M3 turns forward for the predetermined number of pulses, which moves the Paper Aligning Bar to the aligning position to align the copy.

60 msec. later

In a multi-copy cycle

M3 turns backward for the predetermined number of pulses to return the Paper Aligning Bar to

In a single-copy cycle or at the end of aligning the last copy

M3 turns backward and the Paper Aligning Bar is detected at its home position.

the standby position.

M-16

7-3. BIN MOVING MECHANISM

● The Top Bin and 1st to 10th Bin are all held in position by the grooves in

the Side Plate and those in the Spiral Cams. When the Spiral Cams are turned one complete turn by Bin Moving Motor M1, all Bins and Top Bin are at once moved up or down (depending on the turning direction of the Spiral Cam) one Bin position along the grooves in the Spiral Cams.

Top Bin

Bin Upper Limit Interlock Switch S1

1st to 10th Bin

Bin Lower Limit Interlock Switch S2

Bin Moving Pulse Sensor PC1

Bins Moving Up

Bins Moving Down

Spiral Cam

PC1

Light Blocking Plate

M-17

4428M063AA

Bin Lower Limit Position Sensor PC4

Pressure Roll

Drive Transmitting Belt

PC4

Bin Positioning Sensor PC3

● Bin Moving Motor M1

Bin Moving Motor M1 is a DC motor. The outputs from pins 5 and 6 of IC1A are applied via IC7A and IC10A to M1. This energizes or deenergizes M1 and controls the direction of M1 rotation.

IC1A-5 IC1A-6 Direction of M1 Rotation

L H Forward (Bins Moving Up) H L Backward (Bins Moving Down) H H Deenergized

If M1 is turned at its maximum speed, Bins vibrate heavily as they move, resulting in a greater noise. M1 speed is controlled by pulse width modulation, or PWM, which varies the width of pulses applied to M1, thereby changing the average voltage applied to M1. The M1 shaft is fitted with a Pulse Disk and Bin Moving Pulse Sensor PC1 is used to convert the M1 shaft speed to pulse signals. The CPU knows the shaft speed by means of the pulse frequency. Based on the output from PC1, the M1 drive pulses are controlled, thereby minimizing vibration as it occurs during Bin moving. This contributes to quieter operation.

Pulse Disk

PC1

M-18

●

Bin Home Position Detection The home position of the Bins is where the 1st Bin is located to receive copies fed out of the copier. Movement of each Bin is controlled with this position as the reference. The Bin home position is detected by Bin Positioning Sensor PC3 and Bin Lower Limit Position Sensor PC4. PC3 is blocked ( ) and unblocked ( ) by a Light Blocking Plate which turns

in phase with the Spiral Cam. It is unblocked when any of the Bins is located to receive the copy. PC4 is normally kept blocked ( ) by a Light

Blocking Plate. However, when the 1st Bin is located lower than the level to receive the copy, the 10th Bin pushes the Light Blocking Plate, which unblocks PC4 ( ).

Spiral Cam

10th Bin

PC4

Light Blocking Plate

PC3

Senses that any of the Bins is located to receive a copy.

4428M021AA

Light Blocking Plate

Operation at Bin Home Position Detection

➀ M1 is turned backward

until PC4 is unblocked.

➁ M1 is turned forward and

is deenergized as soon as PC3 is unblocked. (This is where the 1st Bin

4428T01MCA

The Bin home position is detected under the following timing:

• Sorter Set Switch S3 is turned ON for the first time after the Power

Switch of the copier has been turned ON.

● Bin Moving Control

After the Bin home position is detected, at which time the 1st Bin is located to receive the copy, movement of the Bins is controlled by the direction of M1 rotation and the number of times PC3 is blocked and unblocked.

receives the copy.)

M-19

● Bin Upper Limit Interlock Switch S1 and Bin Lower Limit Interlock Switch

S2 For a mechanical or electrical failure, Bin Moving Motor M1 can keep on turning even when it should remain stationary. Bin Upper Limit Interlock Switch S1 and Bin Lower Limit Interlock Switch S2 are installed to shut down the DC24V power supply to M1, thereby bringing it to a stop if such trouble occurs.

Bin Upper Limit Interlock Switch S1

If, during the upward motion of the Bins,

Actuator

Top Bin

the Bins continue moving upward above the upper limit position (which is where the 10th Bin is located to receive the copy), the Actuator is swung by the Top

1st Bin

Bin Lower Limit Interlock Switch S2

Bin as shown on the left, actuating S1 to cut off the power supply to M1.

If, during the downward motion of the Bins, the Bins continue moving downward, having moved past the level which unblocks Bin Lower Limit Position

10th Bin

PC4

Sensor PC4, the Light Blocking Plate of PC4 actuates S2 as shown on the left, thus shutting down the power supply to M1.

Light Blocking Plate

● Purpose of Installation of Top Bin

The paper this machine handles is mainly colored copies. Colored copies tend to develop a slight face curl and, as a result, the copies fed out into the1st Bin in the Sort mode can be misaligned with each other in the bin. (With the 2nd Bin and lower, the copies fed into each bin are held by the immediately upper bin and therefore the curl is minimized in the copies.) The Top Bin in this machine therefore functions to keep the copies down as they are fed into the 1st Bin.

M-20

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