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
CONTENTS |
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OUTLINE |
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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 |
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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 |
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DISASSEMBLY AND REASSEMBLY ............................ |
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Removing and Reinstalling the Paper Dust |
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Removing Pad ...................................................... |
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Removing the RADF ............................................... |
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Reinstalling the RADF ............................................. |
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Removing and Reinstalling the Paper Feed |
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Roller/Separation Roller ........................................ |
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Removing and Reinstalling the Double Feed |
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Prevention Pad ..................................................... |
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DIAGRAMS |
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ELECTRICAL PARTS LAYOUT DRAWING ................... |
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CONNECTOR LAYOUT DRAWING ............................... |
24 |
TIMING CHARTS ........................................................... |
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OVERALL WIRING DIAGRAM ....................................... |
26 |
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CONTENTS
This page left blank intentionally.
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
DF-315
DF-315 PRODUCT SPECIFICATIONS
Type
Type: |
Sheet-through type |
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reversible DF |
Functions
Originals size: |
11 x 17, 8.5 x 14, 8.5 x 11, |
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8.5 x 11R, 5.5 x 8.5, 5.5 x |
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8.5R |
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* Double sided copy of 5.5 x |
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8.5 originals is not |
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possible. |
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* All sizes are detected |
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automatically. |
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* Mixing of original sizes |
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possible. |
Kinds of originals |
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Ordinary paper: |
13 - 35 lb. fine quality paper |
Special paper: |
Paper feed and conveyance |
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ability may sometimes be |
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inferior to those of 13 to 35 |
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lb. fine quality paper. |
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The following kinds of paper |
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cannot be used: |
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* OHP film |
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* Blueprint masters |
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* Label paper |
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* Offset masters |
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* Pasted originals |
Maximum number |
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of stacked originals: |
50 sheets (22 lb.) |
Original curling: |
10 mm maximum. |
Original read speed (copies per minute)
Mode |
Original size |
Feed speed |
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Single-sided |
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original to Single- |
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8.5 x11 |
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45 |
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A4 |
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sided copy |
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Dual-sided original |
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8.5 x11 |
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28 |
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to duplex copy |
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A4 |
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Original image |
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read position: |
At the slit glass section |
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Particulars of Machine
Power source: |
24 V DC / 5 V |
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(supplied from main body) |
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Max. power |
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consumption: |
Less than 120VA |
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Weight: |
Approxiamately 31 lbs. |
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Machine dimensions : Width |
23.2 in. |
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Depth |
22.4 in. |
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Height |
5.9 in. |
Maintenance and Life |
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Maintenance: |
Same as the main body |
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Operating Environment |
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Temperature: |
50°F to 86°F |
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Humidity: |
10% to 80%RH |
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Note: The contents of this manual may be changed without prior notice.
Curling |
Original |
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1
DF-315
CENTER CROSS-SECTIONAL VIEW
Separation roller |
Paper feed tray |
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Paper feed roller |
Registration roller
Conveyance roller
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Double feed prevention pad |
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Pressure pulley |
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Original |
Reversal roller |
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image read |
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Slit glass |
position |
Paper exit roller |
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DRIVE SYSTEM DIAGRAM
Original feed motor (M302)
Separation roller
Original feed CL (CL302)
Paper feed roller
Original conveyance motor (M301)
Original pick-up CL (CL301)
Registration roller
Paper exit roller
Conveyance roller
2
DF-315
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 |
Paper feed section |
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section |
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Paper exit section |
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Reversal section |
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Slit glass |
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(Read section) |
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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.
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.
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Separation roller |
Registration roller |
Paper feed roller |
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Original registration PS |
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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 |
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Conveyancec roller |
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Scanning standby |
Original registration PS |
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position |
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Original feed detect PS |
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3
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 |
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Paper exit roller |
Slit glass |
Flapper |
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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 |
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Slit glass |
Reversal roller |
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Original reverse detect PS |
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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 |
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Scanning |
Reversal roller |
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standby position |
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Original reverse detect PS |
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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 |
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 |
Paper exit roller |
Flapper |
Reversal roller |
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Original reverse detect PS |
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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
Paper exit section
Mechanisms |
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Mechanisms |
Methods |
Open/close cover |
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Jam clearance |
Open/close cover *1 |
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Release knob |
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Release knob |
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Conveyance |
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Conveyance guide open/close |
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guide open/close |
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lever |
lever |
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Pressure release lever |
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Platen guide |
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1*: Jam clearance |
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If a paper jam occurs during the feed process, open |
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the open/close cover, raise the conveyance guide |
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open/close lever, and rotate the release knob to |
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remove the jammed original. |
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Conveyance guide |
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6
DF-315
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.
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 |
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Open/close cover |
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Registration roller |
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Paper feed tray |
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Separation roller |
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Paper feed roller |
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Paper exit tray |
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Conveyance roller |
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Original press SD |
Original feed motor |
Original conveyance motor |
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Flapper SD |
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Original pick-up CL |
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Original feed CL |
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Mechanism
Mechanisms |
Methods |
Paper feed |
Paper feed roller |
Double feed prevention |
Double feed prevention pad |
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Separation roller |
Conveyance |
Conveyance roller |
Conveyance path switching *1 |
Flapper |
Reversal feed *2 |
Reversal roller pressure |
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Reversal roller turn-back |
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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
Flapper
*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
Original press SD
9
DF-315
Paper Feed/Conveyance/Scan Control
PS302 |
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5VDC |
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5VDC |
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SGND |
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PS303 |
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PS302 |
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PS302 |
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SGND |
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PS303 |
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5VDC |
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VR301 |
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SGND |
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PS303 |
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PTBD |
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24VDC PGND PGND SGND
DF TXD DF RXD 
CTS
DSR
RTS
DTR
VALID
5VDC PGND 24VDC 24VDC
MAIN BODY |
DFCB |
24VDC
24VDC M301 M301 DRIVE A 
M301 DRIVE A
M301 DRIVE B
M301 DRIVE B
M302 DRIVE 1
M302 DRIVE 2 
M302
CL301
24VDC CL301 DRIVE 
CL302
24VDC CL302 DRIVE 
SD301
24VDC SD301 DRIVE 
SD302
24VDC SD302 DRIVE 
PS304
5VDC
PS304 
SGND
PS307
5VDC SGND PS306 
PS309
5VDC
PS309 
SGND
PS305
PS305 
SGND 5VDC
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.
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 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
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.
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.
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.
(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.
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 |
M302 DRIVE 1 |
M302 DRIVE 2 |
Forward rotation |
H |
L |
Reverse rotation |
L |
H |
Stop |
L |
L |
(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 information 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.
12
DF-315
Paper Exit/Reverse Conveyance Control
24VDC
24VDC M301 M301 DRIVE A 
M301 DRIVE A 
M301 DRIVE B 
M301 DRIVE B 
M302 DRIVE 1
M302 DRIVE 2 
M302
PS304
5VDC
PS304
SGND
PS306
SGND
PS306
5VDC
PS307
5VDC SGND PS307
PS308
5VDC PS308 A 
PS308 B 
SGND
24VDC PGND PGND SGND
DF TXD
DF RXD
CTS
DSR
RTS
DTR
VALID
5VDC PGND 24VDC 24VDC
MAIN BODY |
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).
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.
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