Konica Minolta DF-724 User Manual

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

© 2001, KONICA BUSINESS TECHNOLOGIES, INC. All rights reserved.

Printed in U.S.A.

CONTENTS

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

iv

SAFETY PRECAUTIONS

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 potential 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.

∙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

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-inclu- sive, 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.

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.

v

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!

vi

GENERAL,

MECHANICAL/ ELECTRICAL

1		SPECIFICATIONS
Name			:	Duplexing Document Feeder
Type			:	Paper Take-Up: Take-up from top of stack, U-turn feeding
				Transport: Automatic single-belt transport system
				Turnover: Loop turnover system
				Ejection: U-turn ejection
Installation			: Mounted onto the copier
Type of Document			:	Plain paper
				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
Detectable Document			:	A3L, B4L, A4LC, B5LC, A5L, 11” × 17”L, 8-1/2” × 14”L,
Sizes				8-1/2” × 11”LC, 11” × 15”L, 8-1/4” × 13”L
Capacity			:	Document Feed Table:
				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)
Alignment			: Aligned along the rear Document Edge Guide
Document Loading			: Face up (Single Feed Mode-Face down)
Modes			:	1-Sided Original				The “Original Thickness” function
				2-Sided Original
								of User’s Choice permits selection
				2-in-1
								between the plain paper and thin
				Mixed Original
								paper mode.
				Single Feed Mode
Power Source			: 24 VDC, supplied from the copier
Power Consumption			:	60W or less/2.5A
Dimensions			:	Width 627 mm
				Depth 515 mm
				Height 125 mm
Weight			:	13.0 kg

M-1

Documents which	:	The following documents, if used in the DF-724, are very
cannot be used		likely to cause trouble.
Type of Document			Possible Trouble
Documents stapled or clipped together			Take-up failure, damaged document, defec-
			tive drive train due to jammed staples or
			clips.
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
Documents for which	:	The following documents, if used in the DF-724, may or
feeding cannot be		may not cause trouble.
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			Take-up failure
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

M-2

2 COMPONENTS IDENTIFICATION

1

2

3

4

7

5

6	4486M019AA

9

8

4486M037AA

1.	Hookup Cord	6.	Turnover Cover Release Switch
2.	Maintenance Cover	7.	Turnover Cover
3.	Take-Up Cover	8.	Transport Belt
4.	Single Feed Tray	9.	Magnet Catches
5.	Document Feed Table

M-3

3 CROSS-SECTIONAL VIEW

18 19			1 2			3 45 6

4486M015AB

	1716 151413	12	11 10987
1.	Document Detecting Sensor (S1)	11. Transport Belt Drive Roller
2.	Document Take-Up Roller	12. Transport Rolls
3.	Document Separator Roller	13. Transport Belt Guide Roller
4.	Registration Sensor	14.	Transport Belt Driven Roller
5.	Single Feed Transport Roller	15.	Exit Roller
6.	Manual Feed Take-up Sensor (PWB-D) 16. Turnover Roller
7.	Single Feed Transport Roll	17. Turnover/Exit Sensor
8.	Registration Driven Roller	18.	Turnover/Exit Switching Plate
9.	Registration Drive Roller	19.	Exit Roll

10. Size Sensor

M-4

4 DRIVE SYSTEM
Turnover/Exit
Mechanism	Take-Up/Transport Mechanism

Take-Up

Motor (M1)

Turnover/Exit

Motor (M3)

Transport Motor (M2)

Transport Belt Drive Mechanism

4486M038AA

M-5

5 ELECTRICAL COMPONENT LAYOUT

				4486M039AA
Code		Name	Code	Name
PWB-A		Main Control Board	SOL1	Document Stopper Solenoid
PWB-B		Registration Sensor	SOL2	Document Pressure Solenoid
PWB-C		Size Sensor	SOL3	Scale Solenoid
PWB-D		Manual Feed Take-up Sensor	SOL4	Turnover/Exit Switching Solenoid
PWB-E		Turnover/Exit Sensor	S1	Document Detecting Sensor
M1		Take-Up Motor	S2	Feed Cover Set Switch
M2		Transport Motor	S3	Turnover Cover Set Switch
M3		Turnover/Exit Motor	MICLK	Document Feed Motor Pulse
				Sensor

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 2- sided 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 operation (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 Tray, 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 Tray; However, 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
1		Feed Cover Set Sensor (S2)	9	Manual Feed Take-up Sensor
2		Document Pressure Pad		(PWB-D)
3		Document Feed Motor Pulse	10	Registration Drive Roller
		Sensor (M1CLK)	11	Single Feed Transport Roller
4		Document Pressure Solenoid	12	Registration Driven Roller
		(SOL2)	13	Document Separator Roller
5		Document Stopper Solenoid	14	Document Take-Up Roller
		(SOL1)	15	Size Sensor (PWB-C)
6		Take-Up Motor (M1)	16	Document Stopper Guide Plate
7		Transport Motor
8		Registration Sensor (PWB-B)

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 Control

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

	SOL1	IC3A-20	IC3A-21
	ON	H	L
	(Stopper UP)
	OFF
	(Stopper	L	H
	DOWN)

SOL2	IC3A-16
ON	H
OFF	L

M-9

7-3. Document Take-Up Mechanism

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			4486T02MAA
Pin 66 (MUL2)
		4486T02MAA
					4486T01MAA
Pin 67 (MIHI)
		4486T02MAA			4486T03MAA
Pin 68 (MIL2)
		4486T03MAA			4486T02MAA

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 screws, 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 in the raised position at the time 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)

Registration Drive Roller

Single Feed Transport Roller

4486M006AB

M-12

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 Transport 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			Procedure
		Step 1	Step 2	Step 3	Step 4
	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

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.

<Operation>
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		4486M027CA

4486D032AA

4486D030AA

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				Procedure
		Step 1	Step 2	Step 3	Step 4	Step 5	Step 6	Step 7	Step 8
	Pin 2	H	H	H	L	L	L	L	L
	Pin 3	L	L	L	L	H	H	H	L
	Pin 6	L	L	H	H	H	L	L	L
	Pin 7	H	L	L	L	L	L	H	H
	Forward Rotation

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

4486M032CA

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

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.

4486M033CA

M-18

TEST MODES