Konica Minolta DF-311 User Manual

SERVICE MANUAL

MODEL

DF-311

JUNE 1998

CSM-DF311

DF-311

TABLE OF CONTENTS
SAFETY PRECAUTIONS ......................................................	v
DF-311
SPECIFICATIONS ..................................................................	1
Type ................................................................................	1
Functions ........................................................................	1
Machine Data .................................................................	1
Maintenance ...................................................................	1
Operating Environment ..................................................	1
CENTER CROSS SECTION..................................................	2
DRIVE SYSTEM DIAGRAM.....................................................	2
ORIGINAL CONVEYANCE PROCESS ..................................	3
Single -side Original Copy Mode ...................................	3
Double-side Original Copy Mode...................................	4
Mixed Original Copy Mode ..............................................	4
EXTERNAL SECTION ............................................................	5
Construction ...................................................................	5
Mechanisms ...................................................................	5
Disassembly and Reassembly .....................................	6
PAPER FEED/PAPER EXIT SECTION...................................	8
Construction ...................................................................	8
Mechanism .....................................................................	8
Disassembly and Reassembly .....................................	9
Paper Feed/Conveyance/Scan Control........................	11
Paper Exit/Reverse Conveyance Control .....................	13
Original Size Detection Control ....................................	15
DIAGRAMS
ELECTRICAL PARTS LAYOUT DIAGRAM .........................	17
CONNECTOR LAYOUT DIAGRAM ......................................	18

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DF-311

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DF-311

PRODUCT SPECIFICATIONS

Type

Type: Sheet-through type reversible DF

Functions

Originals size: 11X17,8.5X14,8.5X11, 8.5X11R, 8.5X5.5, 8.5X5.5R, 5.5X8.5R

· Double sided copy of 5.5X8.5 originals is not possible.

· All sizes are detected automatically.

· Mixing of original sizes possible.

Kinds of originals

Ordinary paper: 14 to 36 lb. fine quality paper Special paper: Paper feed and conveyance

ability may sometimes be inferior to those of 14 to 36 lb. fine quality paper.

The following kinds of paper cannot be used:

·OHP film

·Blueprint masters

·Label paper

·Offset masters

·Pasted originals

Original

Curling

Original curling:

10 mm maximum.

Maximum number of stacked originals:

50 sheets (22 lb.)

Original read speed (copies per minute)

	Mode	Original size	Feed speed
	Single-sided
	original to Single-	8.5x11	40
	sided copy
	Dual-sided original	8.5x11	28
	to duplex copy
Original feed layout:		Face-up setting, centered, U-turn
		feed/straight paper exit, reversal
		section mounted at paper exit
		side.

Original image read position:

At the slit glass section

Machine Data

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

Max. power consumption:

40 W

Weight: Approximately 30 lb.

Machine dimensions :

Unit: inches

22.0

23.2

5.9

Maintenance

Maintenance:

Same as main body

Operating Environment

Temperature:	50°F ~ 91°F
Humidity:	20% to 80%RH

Note: The contents of this manual may be changed without prior notice.

1

DF-311

CENTER CROSS-SECTIONAL DRAWING

		Separation roller	Paper feed tray
			Paper feed roller
Registration roller
Conveyance roller
Original		Pressure pulley
image read		Reversal roller
position
	Paper exit roller
Slit glass

DRIVE SYSTEM DRAWING

Original feed motor (M302)

Original feed clutch	Separation roller
(CL302)	Paper feed roller

Original conveyance motor (M301)

Original pick-up clutch

(CL301)

Registration roller

Pressure pin

Paper exit roller

Conveyance roller

2

DF-311

ORIGINAL CONVEYANCE PROCESS

As the figure below shows, the DF-311 is composed of the paper feed section, conveyance section, reversal section and paper exit section.

	Conveyance	Paper feed section
	section
		Paper exit section
		Reversal section
	Slit glass
	(Read section)

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

The operational modes of the DF-311 include three modes: (a) single side original copy mode, (b) double side original copy mode, (c) mixed original copy mode. The conveyance path is different for each mode.

Single side original copy mode (single side to single side copy, single side to double side copy)

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

	Separation roller
Registration roller	Paper feed roller
PS306 (Original registration)

When PS306 goes on, pre-feed is carried out by the registration roller and the original is conveyed to the conveyance roller. The conveyance roller conveys the original to the position where PS308 (original feed detect) goes on. The original stops at the scanning standby position.

	Registration roller
	Conveyance roller
	Scanning standby
	position	PS306
	PS308	(Original registration)
	(Original feed detect)

When scan is started, the conveyance roller rotates again in the forward direction to convey the original. If there is another original at this time, pre-feed is carried out.

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

Next original
	Paper exit roller
Slit glass	Guide plate

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DF-311

Double side original copy mode

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

The conveyance operation from feeding of the double sided original to the front side scanning standby position is the same as that for the single side original copy mode.

When scanning starts and reading of the front side is completed, the original is conveyed to the reversal section when the guide plate opens and the paper exit path is blocked.

When PS309 (original reversal detect) detects the leading edge of the original that has been conveyed to the reversal section and goes ON, pressure is applied to the pressure pulley. As a result, the reversal roller and pressure pulley clasp the original on both sides and convey it to the inside of the reversal section.

Guide plate	Pressure pulley
Slit glass	Reversal roller
PS309
(Original reversal)

When PS309 detects the trailing edge of the original and goes OFF, the reversal roller rotates in the reverse direction to feed the original from the reversal section to the conveyance roller. Since the original passes over the top of the guide plate at this time, the front and back sides are reversed and the original is sent to the conveyance roller.

The conveyance roller conveys the original to the scanning standby position.

Guide plate	Pressure pulley
Scanning
standby position	Reversal roller
PS309
(Original reversal)

When scanning of the back side starts, the guide plate is closed. As a result, the original which has been read is conveyed around the circumference of the conveyance roller and is ejected to the paper exit section via the paper exit roller.

Next original
	Paper exit roller
Slit glass	Guide plate

Mixed original copy mode

The mixed original copy mode can handle both the same series and different series of originals.

The size of the original in the conveyance direction is determined by the ON time of PS306, size detection operation take place prior to the scanning operation.

The original then stops at the scanning standby position. The subsequent operations are the same for all copy modes. For details on the size detection operation, refer to Paper Feed/ Paper Eject section “Original Size Detection Control”.

4

DF-311

EXTERNAL SECTION

Construction

Open/close cover

Paper feed tray

Paper exit section (Paper exit tray)

Mechanism			If the jammed original is hard to remove, operate the pressure
			release lever to remove the pressure of the separation roller,
	Mechanisms	Methods	and then remove the original.
1	Jam clearance	Open/close cover
		Release knob
		Conveyance guide open/close lever
		Pressure release lever
		Platen guide

1: Jam clearance

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

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DF-311

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

Lock

Platen

guide

Disassembly and Reassembly

Removing the RADF

Caution: Be sure that the power cord has been unplugged from the power outlet.

Procedure

(1)Disconnect the RADF connector (CN100) from the right side of the main body.

(2)Loosen the set screws of the stoppers (one each), lower the stoppers, then tighten the screws again.

Stoppers

Set screws

(3)Raise the RADF.

(4)Remove the two set screws holding the stopper bracket.

(5)While supporting the RADF, remove the two stopper brackets and remove the RADF.

Caution: When the stopper brackets are removed, the RADF will tend to fall towards the rear. To prevent this, be sure to support it.

Stopper bracket

Set screws

Reinstalling the RADF

Caution: Be sure that the power cord has been unplugged from the power outlet.

Procedure

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

(2)Remove the two set screws, then remove the read cover (left).

Set screws

Set

screws

Read cover (left)

Original stopper

plate

(3)Attach the two RADF position adjusting jigs to the original stopper plate mounting holes.

(4)Install the RADF and provisionally fasten the two stopper brackets with the set screws.

Caution: Fit the oblong cutouts in the stopper brackets onto the guide screws.

6

	DF-311
Guide hole (round)	Set screw B
	Set screw A
Guide hole
(oblong)
	Guide screw
RADF position adjusting jigs	Stopper
	bracket
Pear-shaped
hole	Set screws

(5)Close the RADF and slide the entire assembly back or forward so that the guide holes match the RADF position adjusting jigs.

(6)When the correct position has been established, carefully open the RADF without disturbing its position and permanently tighten the stopper brackets that were provisionally fastened previously.

(7)Close the RADF and verify that the two read position stoppers both contact the original glass (1).

	Stopper
	Projection
	Projection
Original	Stopper
glass (1)

(8)Adjust set screws A and B alternately, until both stoppers contact the slit glass.

Caution: Repeat step (8) until both stoppers contact the original glass (1).

(9)Remove the two RADF position adjusting jigs and install the original stopper plate .

(10)Install the read cover (left).

7

DF-311

PAPER FEED/PAPER EXIT SECTION

Construction
Open/close cover					Registration
	Paper feed tray				roller
		Paper feed roller	Separation roller
	Paper exit tray
					Conveyance
					roller
	Original pressure	Original feed motor
Guide plate solenoid (SD301)	solenoid (SD302)			Original	Original
		(M302)
				pick-up	conveyance motor
		Original feed clutch		clutch	(M301)
		(CL302)		(CL301)

Mechanism

	Mechanisms	Methods
	Paper feed	Paper feed roller
	Double feed prevention	Double feed prevention pad
		Separation roller
	Conveyance	Conveyance roller
1
	Conveyance path switching	Guide plate
2
	Reversal feed	Reversal roller pressure
		Reversal roller turn-back

1: Conveyance path switching

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

Conveyance roller

Guide plate

Guide plate solenoid

(SD301)

Flapper

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DF-311

2: Reversal feed

During double side original copy operation, the original conveyed to the reversal section is held in the standby mode on the reversal roller. Reversal feed is activated by bringing the pressure pulleys into contact with the reversal roller. Pressure of the pressure pulleys is conducted by the original pressure solenoid (SD302).

Pressure pulley

Reversal roller

Pressure pulleys

Original pressure

solenoid (SD302)

Disassembly and Reassembly

Removing and Reinstalling the paper feed roller/ separation roller

Caution: Be sure that the power cord has been unplugged from the power outlet.

Procedure

(1)Open the open/close cover. Remove the four set screws to remove the rear cover.

(2)While gently pulling out at the rear to free the locating parts.

Set screws

Set screws

Locating parts

Rear cover

(3)Rotate the gear until the two pressure pins on the pickup shaft point up.

Gear

Pressure

pin

Pick-up shaft

Caution: The pick-up shaft cannot be turned directly. Be sure to rotate it via the gear.

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DF-311

(4)Remove the two springs.

(5)Remove the stop ring and slide the bearing to the side.

(6)Slide the paper feed roller assembly towards the front side, then remove it.

Bearing	Stop ring
Front
	Springs
	Paper feed
	roller assembly

(7)Remove the bearing.

(8)Remove the two stop rings, then remove the guide lever.

(9)Remove the separation roller and paper feed roller. Caution: When re-installing the separation roller, pay atten-

tion to correct roller orientation. (The correct orientation can be determined by looking at the side shape of the roller.)

Separation roller
Stop rings	Bearing
Guide lever
Paper
feed
drive
belt
Paper feed roller	Side shape of roller

(10)Reinstall the paper feed roller and separation roller in the opposite sequence to removal.

Caution: When reinstalling the paper feed roller assembly, ensure that the two pressure pins on the pickup shaft point upwards.

Removing and Reinstalling the double feed prevention pad

Caution: Be sure that the power cord has been unplugged from the power outlet.

Procedure

(1)Remove the paper feed roller assembly.

(2)Push the pressure release lever so that pressure on the double feed prevention pad is released.

Double feed

prevention pad

Pressure

release lever

(3)Push the double feed prevention pad down, slide it towards the paper feed tray, and then remove it.

	Pressure
	spring
Double feed prevention pad	Paper feed tray

(4)Reinstall the double feed prevention pad in the opposite sequence to removal.

Caution: When re-installing the double feed prevention pad, be sure that the double feed prevention pad pressure spring is in the correct position.

10

DF-311

Paper feed/conveyance/scan control

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

Operation

Sensor adjustment when the power is ON.

When SW2 (sub-power) is ON, a sensitivity PS306 (original registration) and PS308 (original feed detect) is adjusted automatically. However, if the RADF open/close cover is open or an original is inside of the RADF, there will be no automatic adjustment.

Original pressure operation

When a control signal from the main body is received, CL301 (original pickup) goes ON, and after the specified time M302 starts to rotate in the forward direction. This causes the paper feed roller to be lowered, applying pressure to the original.

After the specified time, M302 and CL301 go OFF, but the pressure on the original is maintained.

Paper feed operation

When CL302 (original feed) goes ON, the driving force of M302 is transmitted to the paper feed roller and the separation roller.

CL302 goes ON at the same time as M302 performs forward rotation. When M302 switches from forward to reverse rotation, paper feed starts.

When PS306 (original registration) goes ON, the reverse rotation of M302 is switched OFF after the specified time.

Pre-feed of first sheet

When the reverse rotation of M302 stops, the motor starts again to rotate in forward direction after the specified time. This causes the original to be moved to the conveyance roller.

At the specified time after forward rotation of M302 has started, M301 (original conveyance) goes ON and moves the original from the conveyance roller to the scanning standby position.

When PS308 (original feed detect) detects the leading edge of the original and turns ON, CL302 and M302 go OFF. After the specified time, M301 slows down and then goes OFF. At this point, the original still moves a small distance further due to the inertia of the conveyance roller and then stops. This is the scanning standby position.

Pre-feed of second and further sheets

The forward rotation of M302 starts the pre-feed process of the following original, but because the motor immediately goes OFF, the original temporarily stops before reaching the conveyance roller. When M301 begins the scanning operation, the forward rotation of M302 starts again. Pre-feed of the original then is carried out while the preceding original is being scanned.

Scanning operation (except last original)

At the specified time after M301 goes OFF, it goes ON again and conveys the original over the slit glass area of the main body, where scanning is performed.

When PS306 detects the trailing edge of the original that is being scanned and goes OFF, CL302 again goes ON and the feed operation of the next original starts.

11	Revised 10/00