Konica Minolta DF-314 User Manual
SERVICE MANUAL
Model
DF-314
SECOND EDITION
NOVEMBER 2000
CSM-DF314
KONICA BUSINESS TECHNOLOGIES, INC.
DF-314
SERVICE MANUAL
NOVEMBER 2000
SECOND EDITION
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-314 PRODUCT SPECIFICATIONS........................... 1
Type ......................................................................... 1
Functions ................................................................. 1
Machine data ........................................................... 1
Maintenance ............................................................ 1
Machine environment .............................................. 1
CENTER CROSS-SECTIONAL DIAGRAM...................... 2
DRIVE SYSTEM DIAGRAM .............................................. 3
ORIGINAL CONVEYANCE PROCESS............................ 4
Single-side original copy mode .............................. 4
Double-side original copy mode ............................. 5
Mixed original copy mode........................................ 5
UNIT EXPLANATION
EXTERNAL SECTION .................................................... 7
Composition ............................................................. 7
Mechanisms ............................................................. 7
ORIGINAL FEED/REVERSAL/ORIGINAL EXIT
SECTION ........................................................................ 8
Composition ............................................................. 8
Mechanisms ............................................................. 8
Original feed/conveyance/scan control ................... 9
Original exit/reversal and conveyance
control .................................................................. 11
Original size detection control ............................... 13
DF-314
DISASSEMBLY/ASSEMBLY
DISASSEMBLY/ASSEMBLY ......................................... 15
Replacing feed roller/A .......................................... 15
Replacing the double-feed prevention
roller/A assy ......................................................... 15
Replacing read roller ............................................... 1
DIAGRAMS
ELECTRICAL PARTS LAYOUT ..................................... 17
CONNECTOR LAYOUT ................................................ 18
TIME CHART (8.5 X 11, 1-SIDED ORIGINAL, 3
SHEETS) ..................................................................... 19
TIME CHART (8.5 X 11, 2-SIDED ORIGINAL, 2
SHEETS) ..................................................................... 20
OVERALL WIRING DIAGRAM...................................... 21
iii
DF-314
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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 nor mal, 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 dan gerous 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 elec tronic aspects. It is not reasonable to expect individu als 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, compo nents 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 alco hol, 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-314 PRODUCT SPECIFICATIONS
DF-314
Type
Type:
Sheet-through type reversible
DF
Functions
Originals Size:
Original Type
Plain Original: 10 lb. - 35 lb. fine quality
Special Original: Original feed and convey-
Original Curling: 10mm maximum (10 lb. to 35
11x17, 8.5x14, 8x13, 8.5x11,
8.5x11R, 5.5x8.5, 5.5x8.5R
• All sizes are detected
automatically.
• Mixing of original size
possible.
original
ance ability may be inferior
those of 10 lb. to 35 lb. fine
quality original.
The following types of original cannot be used:
• OHP film
• Blueprint masters
• Offset masters
• Bonded original
lb. high-quality paper)
Original
Original Scan Speed (Copies Per Minute)
Mode Original Feed
size speed
Single sided Original → A4 30
Single sided Copy
Double sided Original → A4 18
Double sided Copy
Original Feed Layout:
Original image read Position:
8.5x11
8.5x11
Face-up placement, center
standard
At the slit glass section
Machine data
Power Source: DC24V/5V (supplied from the
main body)
Maximum Power Consumption:
Maximum 100VA
Weight: Approximately 24 lb.
(including about 2.5 lb. for
platen)
Machine Dimensions:Length 22.7 in
Depth 19.6 in.
Height 3.9 in.
Maintenance
Maintenance: Same as the main unit
Curling
Maximum Number of Stacked Originals:
50 sheets maximum (22 lb.)
Machine environment
Temperature: 50 to 86 F
Humidity: 10 to 80%RH
(below condensation-forming
conditions)
Caution: The contents of this service manual are
subject to change without notice.
1
DF-314
CENTER CROSS-SECTIONAL DIAGRAM
Separation roller
Registration roller
Reversal guide
Read out
roller
Original feed roller
Paper lift-up plate
Double feed prevention roller
Reversal roller
Original conveyance rollers
Original exit roller
Exit guide
2
DRIVE SYSTEM DIAGRAM
DF-314
Original conveyance motor (M302)
Original exit roller
Exit guide
Original feed motor (M301)
Original reversal motor (M303)
Registration
roller
Double feed
prevention roller
Reversal guide
Separation roller
Original feed roller
Paper lift-up plate
Feed drive
Reversal roller
Reversal drive
Roller pressure SD (SD302)
Conveyance/exit drive
*Reversal and Exit Rollers
A reversal roller pulley is attached to the original
exit roller shaft. The reversal roller conveys the
original through pressure being applied on the
pulley by the roller pressure SD.
Original exit roller
Reversal roller
Pulley
Roller pressure SD (SD302)
Exit SD (SD303)
3
DF-314
ORIGINAL CONVEYANCE PROCESS
As illustrated below, the DF-314 is made up of a original
feed section, conveyance section, original exit section and
reversal section.
Conveyance
section
Slit glass
(Read section)
Original feed section
Reversal section
Original exit section
With the originals set face-up on the original feed tray,
they are fed from the topmost original. Rather than being
conveyed to an original glass surface, the originals that
are fed in and read when they pass a slit glass placed in
the conveyance path.
There are 3 modes in the DF-314 operation mode, singleside original copy mode, double-side original copy mode,
and mixed original copy mode, and the conveyance path
differs according to each mode.
When PS311 turns ON, the original is re-fed by the
registration roller and conveyed to the original
conveyance roller. The original conveyance roller
conveys the original to the position where PS312 (original
feed PS) turns ON.
Conveyance rollers
Original feed PS
(PS312)
Registration roller
Original registration
PS (PS311)
The conveyance roller turns, and scanning starts. If there
is another original waiting, it is pre-fed at this point.
The scanning of the original is conveyed out when the
original passes over the slit glass. The original which has
been read is exited to the original exit tray by the original
exit roller with the exit SD OFF (i.e. with the exit guide
raised).
Single-Side Original Copy Mode
(Single-side to single-side copy, single-side to
double-side copy)
The original that has been set in the paper feed tray is
lifted by the paper lift-up plate so it comes into contact with
the original feed roller. The original feed roller and the
separation roller pre-feed to the position where P311
(original registration PS) turns on.
Separation roller
Registration roller
Original registration PS (PS311)
Original feed roller
Paper lift-up plate
Slit glass
Next original
Original exit roller
Exit guide
4
DF-314
Double-side Original Copy Mode
(Double-side to single-side copy, double-side to
double-side copy)
The original set in the original feed tray is pre-fed to the
position where PS311 (original registration PS) turns ON
by the original feed roller and the separation roller. When
PS311 turns ON, the reversal guide opens, the
registration roller conveys the original to the reversal
section, and the reversal roller conveys the original into
the interior of the reversal section.
Reversal guide
Original registration PS (PS311)
After the specified period from when PS311 detects the
training edge of the original and goes OFF, the original is
conveyed to the stop position at the front edge of the
reversal guide. As the original has been reversed at this
point, the reversal roller is made to rotate in reverse and
it conveys the original to the original conveyance roller. If
there is another original waiting, it is pre-fed at this
timing.
Registration roller
Reversal roller
The exit SD comes ON (the exit guide is lowered) when
scanning of the rear side of the original begins, and the
original is again conveyed to the reversal roller. When
PS312 detects the rear edge of the original and turns
OFF, the original is conveyed as far as the stop position in
front of the reversal gate by the timer. The original has
been reversed once again by this point so is conveyed to
the original conveyance roller. The original conveyance
roller conveys the original and reading of the original face
side starts.
Flapper
Original conveyance
PS (PS312)
Next original
Reversal roller
Exit guide
Slit glass
The original which has been read is exited to the original
exit tray by the original exit roller with the exit SD OFF (i.e.
with the paper exit guide raised). If there is another
original, it is conveyed to the reversal section at this point.
Next original
Reversal roller
The original conveyance roller conveys the original to the
position where PS312 turns ON and the reading of the
original back side starts.
Reversal guide
Flapper
Conveyance roller
Next original
Reversal roller
Exit roller
Slit glass Exit guide
Mixed Original Copy Mode
The mixed original copy mode supports both same-series
originals and different series originals, but as size
detection is performed in PS311 ON time, size detection is
performed before reading.
After the size of the original is detected, the original stops
at the reversal position. Subsequently, operation is the
same as that of the two-sided copy mode.
Refer to "ORIGINAL FEED/REVERSAL/ORIGINAL EXIT
SECTION/Original size detection control" for size
detection operation.
5
DF-314
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6
EXTERNAL SECTION
Composition
Jam access cover
DF-314
Original feed tray
Original exit tray
Mechanisms
Mechanism System
Jam release* Jam access cover
Reversal guide open/close lever
RADF Main body open/close
Knob
Exit-guide open/close lever
Platen separation lever
* Jam removal
If a jam occurs at the original feed, open the Jam
access cover and turning the knob closer to you
withdraw the sheet.
Jam
access
cover
Knob
If a jam occurs in the reversal section, open the
reversal guide with the reversal guide open/close
lever and withdraw the sheet.
Reversal guide open/close lever
Reversal
guide
If a jam occurs in the conveyance section, open
the exit tray (using the platen separation lever)
and the exit guide (using the exit-guide open/
close lever) and withdraw the sheet.
Exit guide
Exit guide open/close lever
Platen separation lever
Original exit tray
7
DF-314
ORIGINAL FEED/REVERSAL/ORIGINAL EXIT SECTION
Composition
Jam access cover
Exit SD (SD303)
Original feed unit
Roller pressure SD (SD302)
Original feed tray
Mechanisms
Mechanism System
Original feed Feed roller
Double feed prevention Separation roller
Double feed prevention
Roller
Original conveyance Original conveyance rollers
Original reverse and Reversal guide
feed *1
Original exit path Original exit guide
section *2
Original exit tray
Original
reversal
motor
(M303)
Original conveyance
motor (M302)
Original reversal motor (M303)
Original feed motor (M301)
Reversal guide
Reversal guide
*1: Reversed original feed
During double-side copying, in order to reverse
the original the paper feed path is switched by the
reversal guide, the paper is conveyed to the
reverse mechanism and is reversed.
8
DF-314
*2: Original exit path switching
In the case of a two-sided copy, the paper exit
guide changes over the paper feed path so as to
either exit the original directly, or feed the original
to the reversal section in order to read it once
again.
Exit guide
Exit guide
Exit SD (SD303)
Original Feed/Conveyance/Scan Control
24VDC
24VDC
MAIN BODY
M TXD
M REQ
S ACK
M ACK
S TXD
S REQ
24VDC
24VDC
PGND
PGND
5VDC
SGND
SGND
5VDC
M301 OUT A
M301 OUT A
M301 OUT B
M301 OUT B
24VDC
24VDC
M302 OUT A
M302 OUT A
M302 OUT B
M302 OUT B
5VDC
PS301
SGND
5VDC
DF CB
PS303
SGND
5VDC
PS311
SGND
5VDC
PS312
SGND
VV
M301
M302
PS301
PS303
PS311
PS312
Original feed is achieved by the transmission of the
M301(original feed motor) drive power to the original feed
roller, separation roller and registration roller. Original
conveyance is achieved by the transmission of the M302
(original conveyance motor) drive power to the original
conveyance roller.
The M301 and M302 are controlled by the DFCB (RADF
control board).
9
DF-314
1. Operation
a. Original feed
Original feed is started by the transmission of the
M301 drive power to the original feed roller,
separation roller and paper lift-up plate.
b. 1st original pre-feed
When the copy button is pressed, the M301 starts
original pre-feed, and when the conveyed original
arrives at PS311, M301 stops temporarily after a
specified time. M301 then rotates in reverse, turning
the registration roller so that feeding starts again.
The original passes PS311, so that PS311 turns
OFF. A predetermined time interval after PS311
turns OFF, M301 also turns OFF.
c. 2nd original pre-feed
When there is still an original in the original feed tray,
M301 starts after a specified time after PS311 has
turned OFF, and starts the pre-feed from after the
second sheet. The original is conveyed in the same
way as in the 1st. original pre-feed.
2. Signals
a. Input signals
(1) PS301(PS301 -> DF CB)
Original feed tray no-paper detection signal
[L] :Original
[H] : No original
(2) PS303(PS303 -> DF CB)
Original exit section original detection signal
[L] : No original
[H] : Original
(3) PS311(PS311 -> DF CB)
Original conveyance roller entrance original
detection signal
[L] : No original
[H] : Original
(4) PS312(PS312 -> DF CB)
Original detection signal from detector in front of
scan position
[L] : No original
d. Scanning operation (except last original)
When the original arrives at PS311, M302 starts after
a specified time has elapsed and the original is
conveyed to the read section.
Scanning of the original is achieved when the
original passes over the surface of the slit glass of
the main body optical section.
When the original arrives at PS312, scanning is
started after a specified time has elapsed, and when
PS312 turns OFF after the original has passed,
scanning is stopped after the lapse of a fixed period
of time.
e. Scanning operation (last original)
During the scanning operation, when PS301(no
original detect PS) turns OFF, the original currently
being scanned is judged to be the last original. When
the last original has passed PS311, M301 turns OFF
after the lapse of a fixed period of time, and when the
original has passed PS303 (original exit PS), M302
turns OFF after a specified time.
[H] : Original
(5) M TXD (MAIN BODy -> DF CB)
Serial data line; informs RADF of the operating state
of the main body's CB
(6) M REQ (MAIN BODY -> DF CB)
Transmission request signal from main body to
RADF
(7) S ACK (MAIN BODY -> DF CB)
Transmission OK signal from main body to RADF
10
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