Konica Minolta DF-315 User Manual
SERVICE MANUAL
Model
DF-315
NOVEMBER 2000
CSM-DF315
KONICA BUSINESS TECHNOLOGIES, INC.
DF-315
SERVICE MANUAL
NOVEMBER 2000
Used on Konica Model
7045
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
© 2000, KONICA BUSINESS TECHNOLOGIES, INC.
All rights reserved.
Printed in U.S.A.
CONTENTS
OUTLINE
DF-315 PRODUCT SPECIFICATIONS ............................1
CENTER CROSS-SECTIONAL VIEW .............................2
DRIVE SYSTEM DIAGRAM ............................................. 2
ORIGINAL CONVEYANCE PROCESS............................3
Single Side Original Copy Mode ...............................3
Double Side Original Copy Mode ............................. 4
Mixed Original/Z-Fold Original Mode ........................5
UNIT EXPLANATION
EXTERNAL SECTION...................................................... 6
Composition .............................................................. 6
Mechanisms ..............................................................6
PAPER FEED/PAPER EXIT SECTION ............................8
Composition .............................................................. 8
Mechanisms ..............................................................8
Paper Feed/Conveyance/Scan Control ..................10
Paper Exit/Reverse Conveyance Control ................ 13
Original Size Detection Control...............................15
DISASSEMBLY/ASSEMBLY
DISASSEMBLY AND REASSEMBLY ............................ 17
Removing and Reinstalling the Paper Dust
Removing Pad ...................................................... 17
Removing the RADF ............................................... 17
Reinstalling the RADF.............................................19
Removing and Reinstalling the Paper Feed
Roller/Separation Roller........................................ 21
Removing and Reinstalling the Double Feed
Prevention Pad .....................................................2 2
CONTENTS
DIAGRAMS
ELECTRICAL PARTS LAYOUT DRAWING................... 23
CONNECTOR LAYOUT DRAWING...............................24
TIMING CHARTS ...........................................................25
OVERALL WIRING DIAGRAM....................................... 26
iii
CONTENTS
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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.
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.
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
DF-315 PRODUCT SPECIFICATIONS
DF-315
Type
Type: Sheet-through type
reversible DF
Functions
Originals size: 11 x 17, 8.5 x 14, 8.5 x 11,
8.5 x 11R, 5.5 x 8.5, 5.5 x
8.5R
* Double sided copy of 5.5 x
8.5 originals is not
possible.
* All sizes are detected
automatically.
* Mixing of original sizes
possible.
Kinds of originals
Ordinary paper: 13 - 35 lb. fine quality paper
Special paper: Paper feed and conveyance
ability may sometimes be
inferior to those of 13 to 35
lb. fine quality paper.
The following kinds of paper
cannot be used:
* OHP film
* Blueprint masters
* Label paper
* Offset masters
* Pasted originals
Original read speed (copies per minute)
Mode
Single-sided
original to Single-
sided copy
Dual-sided original
to duplex copy
Original image
read position: At the slit glass section
Original size
8.5 x11
A4
8.5 x11
A4
Feed speed
45
28
Particulars of Machine
Power source: 24 V DC / 5 V
(supplied from main body)
Max. power
consumption: Less than 120VA
Weight: Approxiamately 31 lbs.
Machine dimensions : Width 23.2 in.
Depth 22.4 in.
Height 5.9 in.
Maintenance and Life
Maintenance: Same as the main body
Operating Environment
Temperature: 50°F to 86°F
Humidity: 10% to 80%RH
Note: The contents of this manual may be changed
without prior notice.
Maximum number
of stacked originals: 50 sheets (22 lb.)
Original curling: 10 mm maximum.
Curling
Original
1
DF-315
CENTER CROSS-SECTIONAL VIEW
Registration roller
Conveyance roller
Original
image read
Slit glass
position
Separation roller
Double feed prevention pad
Pressure pulley
Reversal roller
Paper exit roller
Paper feed roller
DRIVE SYSTEM DIAGRAM
Original feed motor
(M302)
Paper feed tray
Original conveyance
motor (M301)
Separation roller
Original feed CL (CL302)
Paper feed roller
Original pick-up CL (CL301)
Registration roller
Paper exit roller
Conveyance roller
2
ORIGINAL CONVEYANCE PROCESS
As the figure below shows, the DF-315 is composed of the
paper feed section, conveyance section, reversal section,
and paper exit section.
Conveyance
section
Paper feed section
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 original registration PS (PS306) goes on.
DF-315
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-315 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.
Separation roller
Registration roller
Original registration PS
Paper feed roller
When original registration PS 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 original feed detect PS (PS308)
goes on. The original stops at the scanning standby position.
Registration roller
Original feed detect PS
3
Conveyancec roller
Scanning standby
position
Original registration PS
DF-315
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 flapper and are ejected
to the paper exit section via the paper exit roller.
Next original
Paper exit roller
Slit glass
Flapper
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 flapper opens and the paper exit path is blocked.
When original reverse detect PS (PS309) 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.
Flapper
Pressure pulley
Slit glass
Reversal roller
Original reverse detect PS
4
DF-315
When original reverse detect PS (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 flapper 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.
Flapper Pressure pulley
Scanning
standby position
Original reverse detect PS
Reversal roller
When original reverse detect PS 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 flapper is
closed at this time, the original is conveyed along the
flapper and is ejected to the paper exit section via the
paper exit roller.
Next original
Flapper
Original reverse detect PS
Paper exit roller
Reversal roller
When scanning of the back side starts, the flapper is
opened. As a result, the original which has been read is
conveyed to the inside of the reversal section again.
Flapper
Mixed Original/Z-Fold Original Mode
In the mixed original mode (can handle both same series
and different series of originals) and the Z-fold original
mode, the original size in the sub-scanning direction is
determined by to the ON time of original registration PS
(PS306), hence size detection takes place before the
scanning operation. This operation takes place for all
originals in the mixed original mode, and only for the first
original in the Z-fold original mode.
After size detection is completed, the original stops at the
scanning standby position. The subsequent operations
are the same for all copy modes. For details of the size
detection process, refer to [5] "Original Size Detection
Control" in "PAPER FEED/PAPER EXIT SECTION".
5
DF-315
EXTERNAL SECTION
Composition
Open/close cover
Paper feed tray
Mechanisms
Mechanisms
Jam clearance
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 *1
Release knob
Conveyance guide open/close
lever
Pressure release lever
Platen guide
Methods
Paper exit section
Open/close cover
Release knob
Conveyance
guide open/close
lever
Conveyance guide
6
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.
DF-315
Separation roller
Pressure release lever
If a paper jam occurs during the reversal process, the
jammed sheet can be removed by opening the platen guide.
Lock
Platen
guide
7
DF-315
PAPER FEED/PAPER EXIT SECTION
Composition
Flapper SD
Mechanism
Mechanisms
Paper feed
Double feed prevention
Conveyance
Conveyance path switching
Reversal feed *2
Open/close cover
Paper feed tray
Original press SD
Methods
Paper feed roller
Double feed prevention pad
Separation roller
Conveyance roller
*1
Flapper
Reversal roller pressure
Reversal roller turn-back
Paper exit tray
Paper feed roller
Original feed motor
Original feed CL
Registration roller
Separation roller
Conveyance roller
Original conveyance motor
Original pick-up CL
8
DF-315
*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 flapper SD (SD301) ON and OFF switches
between the reversal section and the paper exit
section.
Conveyance roller
Flapper
Flapper SD
*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 original press SD
(SD302).
Pressure pulley
Reversal roller
Pressure pulleys
Flapper
Original press SD
9
DF-315
Paper Feed/Conveyance/Scan Control
PS302
PS303
5VDC
SGND
PS302
5VDC
SGND
PS303
PTBD
24VDC
PGND
PGND
SGND
DF RXD
DSR
5VDC
PGND
24VDC
24VDC
MAIN BODY
RTS
5VDC
PS303
PS302
SGND
VR301
DF TXD
CTS
DTR
VALID
DFCB
24VDC
24VDC
M301 DRIVE A
M301 DRIVE A
M301 DRIVE B
M301 DRIVE B
M302 DRIVE 1
M302 DRIVE 2
24VDC
CL301 DRIVE
24VDC
CL302 DRIVE
24VDC
SD301 DRIVE
24VDC
SD302 DRIVE
5VDC
PS304
SGND
5VDC
SGND
PS306
5VDC
PS309
SGND
PS305
SGND
5VDC
M301
M302
CL301
CL302
SD301
SD302
PS304
PS307
PS309
PS305
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 DFCB (RADF control
board).
1. Operation
a. 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.
b. Original pressure operation
When a control signal from the main body is
received, CL301 (original pick-up) 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.
10
DF-315
c. Paper feed operation
When CL302 (original feed) goes ON, the driving
force of M302 (original feed) 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.
d. 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.
h. Original pressure release
When M301 completes the scanning operation for
the last original and goes OFF, CL301 and M302 go
ON which causes the original pressure to be
released. After the specified time, CL301 and M302
go OFF.
e. 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.
f. 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
areaof 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
g. Scanning operation (last original)
During scanning, when M301 is ON and one of the
sensors PS302 (original size detect 1), PS303
(original size detect 2), or PS305 (no original detect)
goes OFF, the original currently being scanned is the
last one.
A sensor that is used to judge the last original differs
depending on the original size.
When PS307 (original exit detect) goes OFF, M301
also is switched OFF after the specified time.
11
DF-315
2. Signals
a. Input signals
(1) PS302 (PS302 to PTDB to DFCB)
Original sub-scanning direction signal
[L]: Original is detected
[H]: Original is not detected
(2) PS303 (PS303 to PTDB to DFCB)
Original sub-scanning direction signal
[L]: Original is detected
[H]: Original is not detected
(3) PS304 (PS304 to DFCB)
M301 (original conveyance) encoder surface slit
detection signal
[L]: Slit is not detected
[H]: Slit is detected
(4) PS305 (PS305 to DFCB)
No original detection signal at the paper feed tray
[L]: Original is detected
[H]: Original is not detected
(5) PS306 (PS306 to DFCB)
Original detection signal at the conveyance roller en
trance section
[L]: Original is detected
[H]: Original is not detected
(6) PS307 (PS307 to DFCB)
Original detection signal at the paper exit section
[L]: Original is detected
[H]: Original is not detected
(7) PS308 A, B (PS308 to DFCB)
Original detection signal at the pre-scanning standby
position
[L]: Original is detected
[H]: Original is not detected
(8) DF RXD (MAIN BODY to DFCB)
Serial data line for transmitting operation status
informa tion from control board in main body to
RADF.
b. Output signals
(1) M301 DRIVE A, A, B, B (DFCB to M301)
M301 ON/OFF drive signal
24V
0V
(2) M302 DRIVE 1, 2 (DFCB to M302)
M302 (original conveyance) drive signal.
M302 rotation direction is controlled by switching the
current direction of these two signals.
State
Forward rotation
Reverse rotation
Stop
(3) CL301 DRIVE (DFCB to CL301)
CL301 (original pick-up) ON/OFF drive signal
[L]: CL301 ON
[H]: CL301 OFF
(4) CL302 DRIVE (DFCB to CL302)
CL302 (original feed) ON/OFF drive signal
[L]: CL302 ON
[H]: CL302 OFF
(5) DF TXD (DFCB to MAIN BODY)
Serial data line for transmitting operation status
informa- tion from RADF to main body CB (control
board).
(6) DTR (DFCB to MAIN BODY)
Send request from RADF to main body.
(7) CTS (DFCB to MAIN BODY)
Send enable from RADF to main body.
(8) VALID (DFCB to MAIN BODY)
Image forming start signal.
M302 DRIVE 1
H
L
L
M302 DRIVE 2
L
H
L
(9) DSR (MAIN BODY to DFCB)
Send enable from main body to RADF.
(10) RTS (MAIN BODY to DFCB)
Send request from main body to RADF.
12
DF-315
Paper Exit/Reverse Conveyance Control
24VDC
24VDC
M301 DRIVE A
M301 DRIVE A
M301 DRIVE B
M301 DRIVE B
M302 DRIVE 1
M302 DRIVE 2
5VDC
PS304
SGND
SGND
PS306
5VDC
5VDC
SGND
PS307
5VDC
PS308 A
PS308 B
SGND
24VDC
PGND
PGND
SGND
DF RXD
5VDC
PGND
24VDC
24VDC
MAIN BODY
DSR
RTS
DF TXD
CTS
DTR
VALID
DFCB
Paper path switching in the exit area is carried out by
solenoid SD301 (flapper) which operates a flapper. In
duplex copy mode, the pressure pulley in the reversal
section is operated by the SD302 (original press).
SD301 and SD302 are controlled by the DFCB (RADF
control board).
M301
M302
PS304
PS306
PS307
PS308
1. Operation
a. Sensor adjustment when the power is ON.
When SW2 (sub power) is ON, a sensitivity of PS309
(original reverse detect) is adjusted automatically.
However, if the RADF open/close cover is open or an
original is in the inside of the RADF, there will be no
automatic adjustment.
b. Paper exit operation
In single-sided copy mode and when copying the
reverse side of a sheet in duplex copy mode, SD301
is OFF and the flapper is closed. The original is
therefore conveyed to the paper exit section after
scanning.
c. Reversal paper exit operation
When copying the first side of a sheet in duplex copy
mode, at the specified time after M301 (original
conveyance) goes ON and scanning starts, SD301
goes ON and the flapper opens. This causes the
original to be sent to the reversal section after
scanning.
At the same time as SD301 goes ON, M302 (original
feed) starts reverse rotation and the drive force is
transmitted to the reversal roller.
When PS309 detects the leading edge of the original
and goes ON, the SD302 goes ON after the specified
time and applies pressure to the pressure pulley. As
a result, the original which has been conveyed to the
reversal section is caught between the reversal roller
and pressure pulley, and conveyed to the inside of
the reversal section.
d. Reversal feed operation
When PS309 detects the trailing edge of the original
and goes OFF, both the M301 and M302 go OFF
after the specified time, and conveyance operation of
the original is stopped.
After a predetermined OFF interval, M302 starts
reverse rotation and feeds the original to the
conveyance roller side of the reversal section. At this
time, PS309 again goes ON and SD302 goes OFF
after the specified time. M302 goes OFF after the
specified time from PS309 goes OFF.
e. Pre-feed operation of next original when reading
back side of original
When PS309 goes OFF, M301 and M302 start
forward rotation after the specified time, and next
original pre-feed is carried out.
13
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