Konica Minolta DB-608, DB-208 User Manual
SERVICE MANUAL
Model
DB-208/608
SECOND EDITION
NOVEMBER 2000
CSM-DB208/608
KONICA BUSINESS TECHNOLOGIES, INC.
DB-208/608
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
CONTENTS
DB-208 OUTLINE
DB-208 PRODUCT SPECIFICATIONS ......................... |
1-1 |
CENTER CROSS-SECTIONAL VIEW .......................... |
1-2 |
DRIVE SYSTEM DIAGRAM .......................................... |
1-2 |
DB-208 UNIT EXPLANATION
PAPER FEED UNIT ...................................................... |
1-3 |
COMPOSITION ............................................................. |
1-3 |
Mechanisms ........................................................... |
1-3 |
Paper Feed and No-Paper Detection Control ........ |
1-4 |
Tray Up Control ...................................................... |
1-6 |
Paper Size Detection Control ................................ |
1-8 |
DB-208 DISASSEMBLY/ASSEMBLY
DISASSEMBLY AND REASSEMBLY ........................... |
1-9 |
Removing and Reinstalling the Paper |
|
Feed Tray ............................................................ |
1-9 |
Removing and Reinstalling the Paper Feed |
|
Unit ...................................................................... |
1-9 |
Replacing the Separation Rubber and the Paper |
|
Supply Rubber ..................................................... |
1-10 |
Removing and Reinstalling the Double-Feed |
|
Prevention Roller .............................................. |
1-10 |
DB-608 OUTLINE
DB-608 PRODUCT SPECIFICATIONS ......................... |
2-1 |
CENTER CROSS-SECTIONAL VIEW .......................... |
2-2 |
DRIVE SYSTEM DIAGRAM .......................................... |
2-2 |
DB-608 UNIT EXPLANATION
500-SHEET PAPER TRAY UNIT .................................. |
2-3 |
Composition ........................................................... |
2-3 |
Mechanisms ........................................................... |
2-3 |
500-Sheet Paper Feed Tray and No-Paper |
|
Detection Control ................................................ |
2-4 |
Tray-Up Control (PFU) ........................................... |
2-6 |
Paper Size Detection Control ................................ |
2-7 |
1500-SHEET PAPER TRAY UNIT ................................ |
2-8 |
Composition ........................................................... |
2-8 |
Mechanisms ........................................................... |
2-8 |
1500-Sheet Paper Feed Tray and No-Paper |
|
Detection Control ................................................ |
2-9 |
Tray-Up Control (LCT) ......................................... |
2-11 |
DB-608 DISASSEMBLY/ASSEMBLY
DISASSEMBLY AND REASSEMBLY ......................... |
2-12 |
Removing the Reinstalling the Paper Feed |
|
Tray ................................................................... |
2-12 |
Removing and Reinstalling the Paper Feed |
|
Unit .................................................................... |
2-12 |
Replacing the Separation Rubber and the Paper |
|
Supply Rubber .................................................. |
2-13 |
Removing and Reinstalling the Double-Feed |
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Prevention Roller .............................................. |
2-14 |
Removing and Reinstalling the Paper Feed |
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Tray (LCT) ......................................................... |
2-15 |
Removing and Reinstalling the Front Tray |
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Cover (LCT) ...................................................... |
2-15 |
Replacing the Up/Down Wires ............................. |
2-16 |
DB-208/608 DIAGRAMS
ELECTRICAL PARTS LAYOUT .................................... |
3-1 |
CONNECTOR LAYOUT ................................................ |
3-2 |
DB-208 OVERALL WIRING DIAGRAM ........................ |
3-3 |
DB-608 OVERALL WIRING DIAGRAM ........................ |
3-4 |
iii
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
DB-208/608
DB-208 PRODUCT SPECIFICATIONS
Type
Type: Paper feed tray (front loading)
Functions
Paper size: |
8.5 x 11/8.5 x 11R/8.5 x 14/ |
|
11x17 |
Paper type: |
16 lb. to 24 lb. high-quality |
|
paper |
Maximum |
|
paper storage: |
500 sheets x 3, 22 lb. |
Particulars of Machine
Power: |
24/5 V DC (supplied from main |
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body) |
|
Power |
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consumption: |
Maximum 40 VA |
|
Weight: |
Approximately 48 lb. |
|
Machine |
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dimensions: |
Width |
24.0 in. |
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Depth |
23.1 in. |
|
Height |
16.9 in. |
Maintenance and Life
Maintenance: Same as the main body
Operating Environment
Temperature: |
50°F to 86°F |
Humidity: |
10% to 80% RH |
Note: These specifications are subject to change without notice.
1-1
DB-208/608
CENTER CROSS-SECTIONAL VIEW
Separation roller
Conveyance rollers (upper)
Paper feed roller
Double-feed prevention roller
Paper lift-up plate |
Conveyance |
|
rollers (middle) |
Conveyance rollers (lower)
Paper lift-up lever
DRIVE SYSTEM DIAGRAM
Paper feed motor (M401)
Up/down motor (U) (M402)
Up/down motor (M) (M403)
Up/down motor (L) (M404)
Intermediate conveyance rollers
Separation roller
Double-feed prevention roller
Paper feed roller
1-2
DB-208/608
PAPER FEED UNIT
Composition
Separation roller
Double-feed prevention roller
Paper feed roller
Guide release lever
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Intermediate |
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Paper feed trays |
conveyance rollers |
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Front cover |
Paper feed door |
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Rear edge stopper
Side guide
Paper feed tray
Mechanisms
Mechanisms |
Method |
Paper feed |
Paper feed roller |
Paper lifting |
Paper lift-up plate |
Double-feed prevention |
Torque limiter |
1st paper feed |
Separation roller, paper |
|
feed SD |
Intermediate conveyance |
Intermediate conveyance |
|
roller |
Paper jam handling |
Double-feed prevention |
|
roller pressure release |
No-paper detection |
Photosensor |
Paper size detection |
Tact switch |
Paper conveyance |
Roller conveyance |
Conveyance drive |
Timing belt |
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|
1-3
DB-208/608
Paper Feed and No-Paper Detection Control
24VDC(DCPS1) |
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M401 CONT |
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PGND(DCPS1) |
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M401 CLK |
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5VDC(SCDB) |
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M401 H/L |
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SGND(SCDB) |
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24VDC |
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DB MTXD(SCDB) |
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M401 CW/CCW |
M401 |
(SCDB) |
DB MACK |
PGND |
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(SCDB) |
DB SRXD |
SGND |
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DB SACK(SCDB) |
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5VDC |
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(PRDB) |
MPS DATA |
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PS401 |
PS401 |
MAIN BODY |
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24VDC |
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SD401 DRIVE |
SD401 |
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SD403 DRIVE |
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24VDC |
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SD402 DRIVE |
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PS402 |
5VDC |
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SGND |
PFUDB(U) |
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PS402 |
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PS404 |
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24VDC |
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PS404 |
5VDC |
SD402 DRIVE |
SD402 |
SGND |
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PS404 |
PFUDB(M) |
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PS406 |
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24VDC |
SD403 |
PS406 |
5VDC |
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SGND |
SD403 DRIVE |
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PS406 |
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PFUDB(L)
Paper is fed by the drive force of M401 (paper feed) to each paper feed roller and each feed roller through SD401 (paper feed (U)), SD402 (paper feed (M)) and SD403 (paper feed (L)).
The M401 and SD401 are driven by the PFUDB (U) (PFU drive board (U)) and controlled by the PFUDB (U) in the main body.
The SD402 is driven by the PFUDB (M) (PFU drive board (M)), the SD403 is driven by the PFUDB (L) (PFU drive board (L)) and controlled by the PFUDB (U).
1.Operation
a.Operation when copying
Paper feed for the first sheet starts a specified time after the start button is turned ON and paper feed operation starts when the M401 (paper feed) and SD401 (SD402 or SD403) turn ON.
The M401 turns OFF a specified time after the PS401 (paper feed detect) detects the leading edge of the page. Each solenoid turns OFF a specified time after being turned ON.
Paper feed for the second and subsequent sheets starts a specified time after the SD401 (SD402 or SD403) turns ON every time paper is fed.
When the paper tray is empty, PS402 (no paper detect (U)), PS404 (no paper detect (M)) or PS406 (no paper detect (L)) changes to a high signal (H), to inform the paper feed drive board that there is no paper in the tray.
1-4
DB-208/608
2.Signals
a.Input signals
(1)PS401 (PS401 to PFUDB (U))
This signal is output when PS401 (paper feed detect) detects paper passing through the paper conveyance section. It changes to an [H] level when paper is detected.
(2)PS402 (PS402 to PFUDB (U))
This signal is a no-paper detecting signal for the paper tray (U).
[L]: When there is no paper in the tray [H]: When there is paper in the tray
(3)PS404 (PS404 to PFUDB (M) to PFUDB (U))
This signal is a no-paper detecting signal for the paper tray (M).
[L]: When there is no paper in the tray [H]: When there is paper in the tray
(4)PS406 (PS406 to PFUDB (L) to PFUDB (U))
This signal is a no-paper detecting signal for the paper tray (L).
[L]: When there is no paper in the tray [H]: When there is paper in the tray
(5)DB MTXD (MAIN BODY to PFUDB (U))
The serial data line informs DB of main body operation
(6)DB SACK (MAIN BODY to PFUDB (U))
This signal is the transmission approved signal from the main body to the DB.
b.Output signals
(1)M401 CONT (PFUDB (U) to M401)
This is the ON/OFF control signal for M401 (paper feed).
[L]: M401 ON [H]: M401 OFF
(2)M401 CLK (PFUDB (U) to M401)
This is the reference clock signal for M401 rotation speed control.
(3)M401 H/L (PFUDB (U) to M401)
This is the signal for rotation speed control for M401.
[L]: High speed [H]: Low speed
(4)M401 CW/CCW (PFUDB (U) to M401)
This is the signal for rotation direction control for M401.
[L]: Forward direction [H]: Reverse direction
(5)SD401 DRIVE (PFUDB (U) to SD401)
This is the ON/OFF control signal for SD401.
[L]: ON [H]: OFF
(6)SD402 DRIVE (PFUDB (U) to PFUDB (M) to SD402) This is the ON/OFF control signal for SD402 (paper feed (M)).
[L]: ON [H]: OFF
(7)SD403 DRIVE (PFUDB (U) to PFUDB (L) to SD403) This is the ON/OFF control signal for SD403 (paper feed (L)).
[L]: ON [H]: OFF
(8)DB SRXD (PFUDB (U) to MAIN BODY)
The serial data line informs main body of DB operation.
(9)DB MACK (PFUDB (U) to MAIN BODY)
This signal is the transmission approved signal from the main body to the DB.
(10)MPS DATA (PFUDB (U) to MAIN BODY)
This signal feeds the PS401 detecting signal back to the main body.
1-5
DB-208/608
Tray Up Control
24VDC(DCPS1) |
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24VDC |
M402 |
PGND(DCPS1) |
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M402 DRIVE |
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5VDC(SCDB) |
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SGND(SCDB) |
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DB MTXD(SCDB) |
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(SCDB) |
DB MACK |
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(SCDB) |
DB SRXD |
SGND |
PS403 |
DB SACK(SCDB) |
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5VDC |
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PS403 |
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MAIN BODY |
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SW401 |
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SW402 |
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SW403 |
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M404 DRIVE |
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SW404 |
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M403 DRIVE |
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5VDC |
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SGND |
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24VDC |
PFUDB(U) |
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24VDC |
M403 |
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M403 DRIVE |
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SGND |
PS405 |
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PS405 |
5VDC |
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PS405 |
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SW401 |
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SW402 |
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SW403 |
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PFUDB(M) |
SW404 |
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24VDC |
M404 |
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M404 DRIVE |
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SGND |
PS407 |
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PS407 |
5VDC |
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PS405 |
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SW401 |
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SW402 |
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SW403 |
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PFUDB(L) SW404 |
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The paper tray is raised by transmitting the M402 (up/ down (U)), M403 (up/down (M)), or M404 (up/down (L)) driving force to the paper lifting lever.
The M402 is driven by PFUDB (U) (PFU drive board (U)) and controlled by the PFUDB (U) in the main body.
The M403 is driven by the PFUDB (M) (PFU drive board (M)), the M404 is driven by the PFUDB (L) (PFU drive board (L)) and controlled by the PFUDB (U) in the main body.
1.Operation
The tray is raised when each motor turns ON after the SW401, 402, 403 or 404 (paper size-detection) turns ON.
When PS403 (upper limit detect (U)), PS405 (upper limit detect (M)), or PS407 (upper limit detect (L)) detects the upper limit of the paper in the tray and turns ON, the lift-up motor turns OFF and the tray stops.
When paper is fed, each upper limit-detecting sensor turns OFF and the tray is raised when the lift-up motor turns ON.
The paper tray is lowered mechanically.
1-6
DB-208/608
2.Signals
a.Input signals
(1)PS403 (PS403 to PFUDB (U))
Upper limit-detecting signal on upper tray.
There is an [H] signal when the upper limit of paper is detected.
(2)PS405 (PS405 to PFUDB (M) to PFUDB (U)) Upper limit-detecting signal on middle tray.
There is an [H] signal when the upper limit of paper is detected.
(3)PS407 (PS407 to PFUDB (L) to PFUDB (U)) Upper limit-detecting signal on lower tray.
There is an [H] signal when the upper limit of paper is detected.
(4)SIZE A, B, C, D (SW401~404 to PFUDB (U)) Paper size-detecting sensor on upper tray.
(5)SIZEA,B,C,D(SW401~404to PFUDB(M)to PFUDB(U)) Paper size-detecting sensor on middle tray.
(6)SIZE A, B, C, D (SW401~404 to PFUDB (L) to PFUDB (U)) Paper size-detecting sensor on lower tray.
b.Output signals
(1)M402 DRIVE (PFUDB (U) to M402)
This is the ON/OFF control signal for M402 (up/down (U)).
[L]: ON [H]: OFF
(2)M403 DRIVE (PFUDB (U) to PFUDB (M) to M403) This is the ON/OFF control signal for M403 (up/down (M)).
[L]: ON [H]: OFF
(3)M404 DRIVE (PFUDB (U) to PFUDB (L) to M404) This is the ON/OFF control signal for M404 (up/down (L)).
[L]: ON [H]: OFF
1-7
DB-208/608
Paper Size Detection Control
24VDC(DCPS1) |
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PGND(DCPS1) |
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5VDC(SCDB) |
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SGND(SCDB) |
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DB MTXD(SCDB) |
PAPER SIZE DETECT |
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(SCDB) |
DB MACK |
SWITCH |
(SCDB) |
DB SRXD |
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DB SACK(SCDB) |
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MAIN BODY |
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SIZE SCN2 |
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SELECT |
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SIZE SCN1 |
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5VDC |
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SGND |
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PFUDB(U) |
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SIZE A |
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SIZE B |
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PAPER SIZE DETECT |
SIZE C |
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SWITCH |
SIZE D |
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PFUDB(M) |
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SIZE A |
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SIZE B |
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PAPER SIZE DETECT |
SIZE C |
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SWITCH |
SIZE D |
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PFUDB(L) |
Each drive board, PFUDB (U) (PFU drive board (U)), PFUDB (M) (PFU drive board (M)) and PFUDB (L) (PFU drive board (L)) is fitted with a series of tact switches for detecting paper size. This informs the main body of the paper size in each tray, the upper tray directly through the main body and the middle and lower trays through the PFUDB.
1.Operation
Each tray has a series of actuators that are operated by the paper guides. When each tray is inserted, these projections turn the tact switches on each drive board OFF and ON. The PFUDB (PFU) determines the paper size of the PFU from the ON/OFF combinations.
2.Signals
a.Output signals
(1)SIZE SCN 1 (PFUDB (U) to PFUDB (M))
Paper size-detecting scan signal for middle tray.
(2)SIZE SCN 2 (PFUDB (U) to PFUDB (L))
Paper size-detecting scan signal for lower tray.
1-8
DB-208/608
DISASSEMBLY AND REASSEMBLY
|
CAUTION: Ensure the power cord is unplugged |
. |
from the socket. |
Removing and Reinstalling the Paper
Feed Tray
a.Procedure
(1)Pull out the paper feed tray and remove the two set screws on the left and the two set screws on the right.
(2)Remove the paper feed tray from the guide rail.
Set screws |
Set screws |
|
Paper feed tray
Guide rail
(3) To reinstall, reverse the procedure above.
Removing and Reinstalling the Paper
Feed Unit
a.Procedure
(1)Slide out the paper tray towards you.
(2)To remove the middle or the low paper feed unit, remove the set screw and pull out the paper feed unit (S) to the direction 1 .
To remove the upper paper feed unit, remove the set screw and pull out the paper feed unit to the direction 2.
Paper feed unit
Set scerw
Guide rail
(3)Reinstall the paper feed unit by reversing the procedure above.
Caution:
1-9
DB-208/608
Replacing the Separation Rubber and
the Paper Supply Rubber
a.Procedure
(1)Remove the paper feed unit.
(2)Remove the stop ring and shaft holder.
(3)While pulling out the paper feed shaft, remove the feed roller from the paper feed roller unit.
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Separation |
Marking |
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rubber |
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Paper |
Separation |
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roller |
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feed shaft |
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Shaft |
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Rocking |
Paper feed |
bushing |
Stop ring |
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shaft |
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roller unit |
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(4)Remove the stop ring and, pulling the guide shaft in the direction of the arrow, remove the paper feed roller
Paper feed roller
Guide shaft
Paper supply rubber
Stop ring
(5)Remove the separation rubber from the separation roller.
(6)Remove the paper supply rubber from the paper feed roller.
(7)To reinstall, reverse the above procedure.
Caution: Make sure each roller rubber is installed in the correct direction. Reinstall so that the rocking shaft fits inside the paper feed roller unit.
Removing and Reinstalling the Double-
Feed Prevention Roller
a.Procedure
(1)Remove the paper feed unit.
(2)Remove the double-feed pressure spring.
(3)While pressing the shaft in the direction of the arrow, remove the double-feed prevention unit from the paper feed unit.
Double-feed |
|
prevention unit Double-feed |
Shaft |
prevention spring
(4)Remove the stop ring, then while pushing the projection on the lever click shaft, pull out the lever click shaft and remove the double feed prevention roller.
Double-feed |
|
prevention roller |
Lever click shaft |
Stop ring
Double-feed prevention unit
(5)Reinstall the double-feed prevention roller by reversing the procedure above.
Caution: After reinstallation, make sure that the double-feed pressure spring moves the double-feed prevention roller smoothly.
1-10
DB-208/608
DB-608 PRODUCT SPECIFICATIONS
Type
Type: Paper feed tray (front loading)
Functions
Paper size: (Upper tray) 8.5 x 11/8.5 x 11R/ 8.5 x 14/11x17
(Lower tray) 8.5 x 11/8.5 x 11R
Paper type: 16lb. to 24lb. high-quality paper
Maximum
paper storage: Upper tray: 500 sheets (22 lb.) Lower tray: 1500 sheets (22 lb.)
Particulars of Machine
Power source: |
24/5 V DC (supplied from main |
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body) |
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Power |
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consumption: |
Maximum 40 VA |
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Weight: |
Approximately 57 lb. (including |
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stand) |
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Machine |
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dimensions: |
Width |
24.0 in. |
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Depth |
23.1 in. |
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Height |
16.9 in. |
Maintenance and Life
Maintenance: Same as the main body
Operating Environment
Temperature: |
50°F to 86°F |
Humidity: |
10% to 80% RH |
Note: These specifications are subject to change without notice.
2-1
DB-208/608
CENTER CROSS-SECTIONAL VIEW
Separation roller
Conveyance rollers (upper)
Paper feed roller
Double-feed prevention roller
Conveyance rollers (lower)
Separation roller
Double-feed
prevention roller
Paper feed roller
Tray
DRIVE SYSTEM DIAGRAM
Paper feed motor (M401)
Intermediate conveyance rollers
Up/down motor (PFU) (M402)
Separation roller
Double-feed prevention roller
Paper feed roller
Up/down motor (LCT) (M403)
2-2
DB-208/608
500-SHEET PAPER TRAY UNIT
Composition |
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Separation roller |
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Double-feed |
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prevention roller |
Paper feed roller |
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Guide release lever |
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Intermediate |
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conveyance rollers |
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Paper feed door |
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Paper feed trays |
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Front cover |
Rear edge stopper |
Side guide |
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Paper feed tray |
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Mechanisms
Mechanisms |
Method |
Paper feed |
Paper feed roller |
Paper lifting |
Paper lift-up plate |
Double-feed prevention |
Torque limiter |
1st paper feed |
Separation roller, paper |
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feed SD |
Intermediate conveyance |
Intermediate conveyance |
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roller |
Paper jam handling |
Double-feed prevention |
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roller pressure release |
No-paper detection |
Photosensor |
Paper size detection |
Tact switch |
Paper conveyance |
Roller conveyance |
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Conveyance drive |
Timing belt |
2-3
DB-208/608
500-Sheet Paper Feed Tray and No-Paper Detection Control
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24VDC(DCPS1) |
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M401 CONT |
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PGND(DCPS1) |
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M401 CLK |
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5VDC(SCDB) |
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M401 H/L |
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SGND(SCDB) |
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24VDC |
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M401 |
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DB MTXD(SCDB) |
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M401 CW/CCW |
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(SCDB) |
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DB MACK |
PGND |
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(SCDB) |
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DB SRXD |
SGND |
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DB SACK(SCDB) |
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5VDC |
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(PRDB) |
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MPS DATA |
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MAIN BODY |
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PS401 |
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PS401 |
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24VDC |
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SD401 |
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SD401 DRIVE |
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5VDC |
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PS402 |
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SGND |
PFUDB(PFU) |
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PS402 |
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Paper is fed by the drive force of M401 (paper feed) to each paper feed roller and each feed roller through SD401 (paper feed (PFU)).
The M401 and SD401 are driven by the PFUDB (PFU) (PFU drive board (PFU)) and controlled by the PFUDB (PFU) in the main body.
1.Operation
a.Operation when copying
Paper feed for the first sheet starts a specified time after the start button is turned ON. The paper feed operation starts when the M401 and SD401 turn ON. The M401 turns OFF a specified time after the PS401 (paper feed detect) detects the leading edge of the page. SD401 turns OFF a specified time after turning ON.
Paper feed for the second and subsequent sheets starts a specified time after the SD401 for the previouspage turns ON.
When the paper tray is empty, PS402 (no paper detect (PFU)) changes to a high signal (L), to inform the PFUDB (PFU) in the main body that there is no paper in the tray.
2-4
DB-208/608
2.Signals
a.Input signals
(1)PS401 (PS401 to PFUDB (PFU))
This signal is output when PS401 (paper feed detect) detects paper passing through the paper conveyance section. It changes to an [H] signal when paper is detected.
(2)PS402 (PS402 to PFUDB (PFU))
This signal is a no-paper detecting signal for the PFU.
[L]: When there is no paper in the tray [H]: When there is paper in the tray
(3)DB MTXD (MAIN BODY to PFUDB (PFU))
The serial data line informs main body of DB operation.
(4)DB SACK (MAIN BODY to PFUDB (PFU))
This signal is the transmission approved signal from the main body to the DB.
b.Output signals
(1)M401 CONT (PFUDB (PFU) to M401)
This is the ON/OFF control signal for M401 (paper feed).
[L]: M401 ON [H]: M401 OFF
(2)M401 CLK (PFUDB (PFU) to M401)
This is the reference clock signal for M401 rotation speed control.
(3)M401 H/L (PFUDB (PFU) to M401)
This is the signal for rotation speed control for M401. [L]: High speed
[H]: Low speed
(4)M401 CW/CCW (PFUDB (PFU) to M401)
This is the signal for rotation direction control for M401.
[L]: Forward direction [H]: Reverse direction
(5)SD401 DRIVE (PFUDB (PFU) to SD401)
This is the ON/OFF control signal for SD401 (paper feed (PFU)).
[L]: ON [H]: OFF
(6)DB SRXD (PFUDB (PFU) to MAIN BODY)
The serial data line informs DB of main body operation.
(7)DB MACK (PFUDB (PFU) to MAIN BODY)
This signal is the transmission approved signal from the main body to the DB.
(8)MPS DATA (PFUDB (PFU) to MAIN BODY)
This signal feeds the PS401 detecting signal back to the main body.
2-5
DB-208/608
Tray-Up Control (PFU)
24VDC (DCPS1) |
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24VDC |
M402 |
PGND (DCPS1) |
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M402 DRIVE |
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5VDC (DCPS1) |
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(SCDB) |
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DB MTXD(SCDB) |
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(SCDB) |
DB MACK |
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(SCDB) |
DB SRXD |
5VDC |
PS403 |
DB SACK(SCDB) |
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SGND |
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PS403 |
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MAIN BODY |
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SW401 |
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SW402 |
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SW403 |
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SW404 |
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PFUDB(UPPER) |
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The paper tray is raised by transmitting the M402 (up/ down) driving force to the paper lifting lever.
The M402 is driven by the PFUDB (PFU) (PFU drive board (PFU)) and controlled by the PFUDB (U) in the main body.
1.Operation
The tray is raised when the M402 turns ON after the SW401, 402, 403 or 404 (paper size-detect) turn ON. After the tray is raised, the PS403 (upper limit detect (PFU)) detects the upper limit of the paper in the tray. The M402 turns OFF and the tray stops. When paper is fed the PS403 turns ON and the tray is raised when the M402 turns ON again.
The paper tray is lowered mechanically.
2.Signals
a.Input signals
(1)PS403 (PS403 to PFUDB (PFU)) Upper limit-detecting signal on PFU.
The signal is at [H] level when the upper limit of paper is detected.
b.Output signals
(1)M402 DRIVE (PFUDB (PFU) to M402)
This is the ON/OFF control signal for M402.
[L]: ON [H]: OFF
2-6
DB-208/608
Paper Size Detection Control
24VDC(DCPS1) |
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PGND(DCPS1) |
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5VDC(SCDB) |
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SGND(SCDB) |
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DB MTXD(SCDB) |
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PAPER SIZE DETECT |
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(SCDB) |
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DB MACK |
SWITCH |
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(SCDB) |
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DB SRXD |
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DB SACK(SCDB) |
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MAIN BODY
PFUDB(UPPER)
The PFUDB (PFU) (PFU drive board (PFU)) is fitted with a series of tact switches for detecting paper size. This informs the main body of the paper size in each tray.
1.Operation
Each tray has a series of actuators that are operated by the paper guides. When each tray is inserted, these projections turn the tact switches on the PFUDB (PFU) OFF and ON. The PFUDB (PFU) determines the paper size of the PFU from the ON/ OFF combinations.
2-7
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