Konica Minolta DF-311 User Manual
SERVICE MANUAL
MODEL
DF-311
JUNE 1998
CSM-DF311
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 ........................ 1 1
Paper Exit/Reverse Conveyance Control .....................1 3
Original Size Detection Control....................................1 5
DIAGRAMS
ELECTRICAL PARTS LAYOUT DIAGRAM.........................17
CONNECTOR LAYOUT DIAGRAM ......................................18
DF-311
iii
DF-311
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iv
PRODUCT SPECIFICATIONS
DF-311
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
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
Original
Curling
Original curling: 10 mm maximum.
Maximum number of stacked originals:
50 sheets (22 lb.)
Original read speed (copies per minute)
Mode
Single-sided
original to Single-
sided copy
Dual-sided original
to duplex copy
Original feed layout: Face-up setting, centered, U-turn
Original size
8.5x11
8.5x11
feed/straight paper exit, reversal
section mounted at paper exit
side.
Feed speed
40
28
Operating Environment
Temperature: 50°F ~ 91°F
Humidity: 20% to 80%RH
Note: The contents of this manual may be changed without
prior notice.
Original image read position:
At the slit glass section
1
DF-311
CENTER CROSS-SECTIONAL DRAWING
Registration roller
Conveyance roller
Original
image read
Slit glass
position
Separation roller
Pressure pulley
Reversal roller
Paper exit roller
Paper feed roller
DRIVE SYSTEM DRAWING
Paper feed tray
Original conveyance
motor (M301)
Original feed clutch
(CL302)
Original pick-up clutch
(CL301)
Conveyance roller
Original feed motor
(M302)
Separation roller
Paper feed roller
Registration roller
Pressure pin
Paper exit roller
2
ORIGINAL CONVEYANCE PROCESS
DF-311
As the figure below shows, the DF-311 is composed of the
paper feed section, conveyance section, reversal section and
paper exit section.
Conveyance
section
Reversal section
Slit glass
(Read section)
Paper feed section
Paper exit 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.
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
Scanning standby
PS308
(Original feed detect)
position
Conveyance roller
PS306
(Original registration)
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.
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
PS306 (Original registration)
Paper feed roller
Next original
Paper exit roller
Slit glass
Guide plate
3
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
Slit glass
Pressure pulley
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”.
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
Scanning
standby position
Pressure pulley
Reversal roller
PS309
(Original reversal)
4
EXTERNAL SECTION
Construction
Open/close
cover
DF-311
Paper feed tray
Paper exit section
(Paper exit tray)
Mechanism
Mechanisms
Jam clearance
∗ 1
∗∗
∗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.
Open/close cover
Release knob
Conveyance guide open/close lever
Pressure release lever
Platen guide
Methods
If the jammed original is hard to remove, operate the pressure
release lever to remove the pressure of the separation roller,
and then remove the original.
5
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 un-
plugged 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
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 un-
plugged 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
(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.
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)
Guide hole
(oblong)
Guide screw
RADF position adjusting jigs
Pear-shaped
hole
Stopper
bracket
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).
Set screw B
Set screw A
(9) Remove the two RADF position adjusting jigs and install
the original stopper plate .
(10) Install the read cover (left).
Stopper
Projection
Projection
Original
glass (1)
Stopper
(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).
7
DF-311
PAPER FEED/PAPER EXIT SECTION
Construction
Open/close cover
Guide plate solenoid (SD301)
Mechanism
Mechanisms
Paper feed
Double feed prevention
Conveyance
Conveyance path switching
∗1
Reversal feed
∗2
Paper feed tray
Paper exit tray
Original pressure
solenoid (SD302)
Methods
Paper feed roller
Double feed prevention pad
Separation roller
Conveyance roller
Guide plate
Reversal roller pressure
Reversal roller turn-back
Paper feed roller
Original feed motor
(M302)
Original feed clutch
(CL302)
Separation roller
Original
pick-up
clutch
(CL301)
Registration
roller
Conveyance
roller
Original
conveyance motor
(M301)
∗∗
∗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
8
∗∗
∗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
DF-311
Disassembly and Reassembly
Removing and Reinstalling the paper feed roller/
separation roller
Caution: Be sure that the power cord has been un-
plugged 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
Pressure pulleys
Original pressure
solenoid (SD302)
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.
9
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
Front
Stop ring
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.)
Removing and Reinstalling the double feed
prevention pad
Caution: Be sure that the power cord has been un-
plugged 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.
Separation roller
Stop rings
Guide lever
Paper
feed
drive
belt
Paper feed roller
Bearing
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.
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
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