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
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
CONTENTS
Removing and Reinstalling the Paper Feed
Tray (LCT).........................................................2-15
Removing and Reinstalling the Front Tray
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
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
Prevention Roller ..............................................2-14
iii
CONTENTS
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iv
SAFETY PRECAUTIONS
SAFETY PRECAUTIONS
Installation Environment
Safety considerations usually are directed toward
machine design and the possibility of human error. In
addition, the environment in which a machine is operated must not be overlooked as a potential safety
hazard.
Most electrical equipment is safe when installed in a
normal environment. However, if the environment is
different from what most people consider to be normal, it is conceivable that the combination of the
machine and the room air could present a hazardous
combination. This is because heat (such as from
fusing units) and electrical arcs (which can occur
inside switches) have the ability to ignite flammable
substances, including air.
When installing a machine, check to see if there
is anything nearby which suggests that a potential hazard might exist. For example, a laboratory
might use organic compounds which, when they
evaporate, make the room air volatile. Potentially dangerous conditions might be seen or smelled. The
presence of substances such as cleaners, paint thinners, gasoline, alcohol, solvents, explosives, or similar items should be cause for concern.
If conditions such as these exist, take appropriate
action, such as one of the following suggestions.
effect may be caused by altering any aspect of the
machine’s design. Such changes have the potential
of degrading product performance and reducing
safety margins.
For these reasons, installation of any modification not
specifically authorized by Konica Business Machines
U.S.A., Inc., is strictly prohibited.
The following list of prohibited actions is not all-inclusive, but demonstrates the intent of this policy.
• Using an extension cord or any unauthorized
power cord adapter.
• Installing any fuse whose rating and physical size
differs from that originally installed.
• Using wire, paper clips, solder, etc., to replace or
eliminate any fuse (including temperature fuses).
• Removing (except for replacement) any air filter.
• Defeating the operation of relays by any means
(such as wedging paper between contacts).
• Causing the machine to operate in a fashion other
than as it was designed.
• Making any change which might have a chance
of defeating built-in safety features.
• Using any unspecified replacement parts.
• Determine that the environment is controlled
(such as through the use of an exhaust hood) so
that an offending substance or its fumes cannot
reach the machine.
• Remove the offending substance.
• Install the machine in a different location.
The specific remedy will vary from site to site, but the
principles remain the same. To avoid the risk of injury
or damage, be alert for changes in the environment
when performing subsequent service on any machine, and take appropriate action.
Unauthorized Modifications
Konica copiers have gained a reputation for being
reliable products. This has been attained by a combination of outstanding design and a knowledgeable
service force.
The design of the copier is extremely important. It is
the design process that determines tolerances and
safety margins for mechanical, electrical, and electronic aspects. It is not reasonable to expect individuals not involved in product engineering to know what
General Safety Guidelines
This copier has been examined in accordance with
the laws pertaining to various product safety regulations prior to leaving the manufacturing facility to
protect the operators and service personnel from
injury. However, as with any operating device, components will break down through the wear-and-tear of
everyday use, as will additional safety discrepancies
be discovered. For this reason, it is important that the
technician periodically performs safety checks on the
copier to maintain optimum reliability and safety.
The following checks, not all-inclusive, should be
made during each service call:
CAUTION: Avoid injury. Ensure that the copier is
disconnected from its power source before continuing.
• Look for sharp edges, burrs, and damage on all
external covers and copier frame.
• Inspect all cover hinges for wear (loose or broken).
• Inspect cables for wear, frays, or pinched areas.
v
SAFETY PRECAUTIONS
• Ensure that the power cord insulation is not damaged (no exposed electrical conductors).
• Ensure that the power cord is properly mounted
to the frame by cord clamps.
• Check the continuity from the round lug (GND) of
the power cord to the frame of the copier -- ensure
continuity. An improperly grounded machine can
cause an electrically-charged machine frame.
Safeguards During Service Calls
Confirm that all screws, parts, and wiring which are
removed during maintenance are installed in their
original positions.
• When disconnecting connectors, do not pull the
wiring, particularly on AC line wiring and high
voltage parts.
• Do not route the power cord where it is likely to
be stepped on or crushed.
• Carefully remove all toner and dirt adhering to any
electrical units or electrodes.
• After part replacement or repair work, route the
wiring in such a way that it does not contact any
burrs or sharp edges.
• Do not make any adjustments outside of the
specified range.
Applying Isopropyl Alcohol
Care should be exercised when using isopropyl alcohol, due to its flammability. When using alcohol to
clean parts, observe the following precautions:
• Remove power from the equipment.
• Use alcohol in small quantities to avoid spillage
or puddling. Any spillage should be cleaned up
with rags and disposed of properly.
• Be sure that there is adequate ventilation.
• Allow a surface which has been in contact with
alcohol to dry for a few minutes to ensure that the
alcohol has evaporated completely before applying power or installing covers.
Summary
It is the responsibility of every technician to use professional skills when servicing Konica products. There
are no short cuts to high-quality service. Each copier
must be thoroughly inspected with respect to safety
considerations as part of every routine service call.
The operability of the copier, and more importantly,
the safety of those who operate or service the copier,
are directly dependent upon the conscientious effort
of each and every technician.
Remember...when performing service calls, use good
judgement (have a watchful eye) to identify safety
hazards or potential safety hazards that may be present, and correct these problem areas as they are
identified -- the safety of those who operate the copier
as well as those who service the copier depend on it!
vi
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
body)
Power
consumption: Maximum 40 VA
Weight: Approximately 48 lb.
DB-208/608
Machine
dimensions: Width 24.0 in.
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
Paper feed roller
Conveyance rollers (upper)
Double-feed
prevention roller
Paper lift-up plate
Paper lift-up lever
DRIVE SYSTEM DIAGRAM
Conveyance
rollers (middle)
Conveyance
rollers (lower)
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
PAPER FEED UNIT
Composition
Paper feed roller
Guide release lever
DB-208/608
Separation roller
Double-feed
prevention roller
Rear edge stopper
Paper feed tray
Mechanisms
Mechanisms
Paper feed
Paper lifting
Double-feed prevention
1st paper feed
Intermediate conveyance
Paper jam handling
No-paper detection
Paper size detection
Paper conveyance
Conveyance drive
Front cover
Side guide
Method
Paper feed roller
Paper lift-up plate
Torque limiter
Separation roller, paper
feed SD
Intermediate conveyance
roller
Double-feed prevention
roller pressure release
Photosensor
Tact switch
Roller conveyance
Timing belt
Paper feed trays
Intermediate
conveyance rollers
Paper feed door
1-3
DB-208/608
Paper Feed and No-Paper Detection Control
24VDC(DCPS1)
PGND(DCPS1)
5VDC(SCDB)
SGND(SCDB)
DB MTXD(SCDB)
(SCDB)
(SCDB)
DB SACK(SCDB)
(PRDB)
MAIN BODY
PS402
PS404
PS406
DB MACK
DB SRXD
MPS DATA
SD403 DRIVE
SD402 DRIVE
5VDC
SGND
PS402
PS404
5VDC
SGND
PS404
PS406
5VDC
SGND
PS406
M401 CONT
M401 CLK
M401 H/L
24VDC
M401 CW/CCW
PGND
SGND
5VDC
PS401
24VDC
SD401 DRIVE
24VDC
PFUDB(U)
24VDC
SD402 DRIVE
PFUDB(M)
24VDC
SD403 DRIVE
PFUDB(L)
M401
PS401
SD401
SD402
SD403
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)
PGND(DCPS1)
5VDC(SCDB)
SGND(SCDB)
DB MTXD(SCDB)
(SCDB)
(SCDB)
DB SACK(SCDB)
MAIN BODY
DB MACK
DB SRXD
M404 DRIVE
M403 DRIVE
5VDC
SGND
24VDC
PS405
24VDC
M402 DRIVE
SGND
5VDC
PS403
PFUDB(U)
24VDC
M403 DRIVE
SGND
5VDC
PS405
PFUDB(M)
M402
PS403
SW401
SW402
SW403
SW404
M403
PS405
SW401
SW402
SW403
SW404
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.
PS407
24VDC
M404 DRIVE
SGND
5VDC
PS405
M404
PS407
SW401
SW402
SW403
PFUDB(L)
SW404
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.
1-6
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) SIZE A, B, C, D (SW401~404 to 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.
DB-208/608
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)
PGND(DCPS1)
5VDC(SCDB)
SGND(SCDB)
DB MTXD(SCDB)
(SCDB)
(SCDB)
DB SACK(SCDB)
MAIN BODY
DB MACK
DB SRXD
5VDC
SGND
PAPER SIZE DETECT
SWITCH
PAPER SIZE DETECT
SWITCH
SIZE SCN2
SELECT
SIZE SCN1
PFUDB(U)
SIZE A
SIZE B
SIZE C
SIZE D
PFUDB(M)
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.
SIZE A
SIZE B
PAPER SIZE DETECT
SWITCH
SIZE C
SIZE D
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.
1-8
DISASSEMBLY AND REASSEMBLY
DB-208/608
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
Paper
feed tray
Set screws
Guide rail
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) To reinstall, reverse the procedure above.
(3) Reinstall the paper feed unit by reversing the procedure
above.
Caution: After installing the paper feed unit, take a
copy to check that the copier is operating
correctly. There is a possibility the paper
will not feed if the rocking gear and paper
feed SD are not in their correct positions.
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.
Removing and Reinstalling the DoubleFeed 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.
Paper
feed shaft
Rocking
shaft
Separation
roller
Paper feed
roller unit
Separation
rubber
Shaft
bushing
Marking
Stop ring
(4) Remove the stop ring and, pulling the guide shaft in the
direction of the arrow, remove the paper feed roller
Paper feed roller
Double-feed
prevention unit
Double-feed
prevention spring
Shaft
(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
Stop ring
prevention roller
Lever click shaft
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.
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-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
body)
Power
consumption: Maximum 40 VA
Weight: Approximately 57 lb. (including
stand)
DB-208/608
Machine
dimensions: Width 24.0 in.
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.
2-1
DB-208/608
CENTER CROSS-SECTIONAL VIEW
Separation roller
Tray
DRIVE SYSTEM DIAGRAM
Paper feed roller
Paper feed roller
Conveyance rollers (upper)
Double-feed
prevention roller
Conveyance
rollers (lower)
Separation
roller
Double-feed
prevention roller
Paper feed motor (M401)
Up/down motor (PFU) (M402)
Up/down motor (LCT) (M403)
Intermediate
conveyance rollers
Separation roller
Double-feed prevention roller
Paper feed roller
2-2
500-SHEET PAPER TRAY UNIT
Composition
Separation roller
Double-feed
prevention roller
Paper feed roller
Guide release lever
Paper feed trays
DB-208/608
Intermediate
conveyance rollers
Paper feed door
Rear edge stopper
Paper feed tray
Mechanisms
Mechanisms
Paper feed
Paper lifting
Double-feed prevention
1st paper feed
Intermediate conveyance
Paper jam handling
No-paper detection
Paper size detection
Paper conveyance
Conveyance drive
Front cover
Side guide
Method
Paper feed roller
Paper lift-up plate
Torque limiter
Separation roller, paper
feed SD
Intermediate conveyance
roller
Double-feed prevention
roller pressure release
Photosensor
Tact switch
Roller conveyance
Timing belt
2-3
DB-208/608
500-Sheet Paper Feed Tray and No-Paper Detection Control
24VDC(DCPS1)
PGND(DCPS1)
5VDC(SCDB)
SGND(SCDB)
DB MTXD(SCDB)
(SCDB)
(SCDB)
DB SACK(SCDB)
(PRDB)
DB MACK
DB SRXD
MPS DATA
MAIN BODY
5VDC
PS402
SGND
PS402
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.
M401 CONT
M401 CLK
M401 H/L
24VDC
M401 CW/CCW
PGND
SGND
5VDC
PS401
24VDC
SD401 DRIVE
PFUDB(PFU)
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.
M401
PS401
SD401
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)
PGND (DCPS1)
5VDC (DCPS1)
(SCDB)
DB MTXD(SCDB)
(SCDB)
(SCDB)
DB SACK(SCDB)
DB MACK
DB SRXD
MAIN BODY
PFUDB(UPPER)
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.
24VDC
M402 DRIVE
5VDC
SGND
PS403
M402
PS403
SW401
SW402
SW403
SW404
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
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.
2-6
Paper Size Detection Control
24VDC(DCPS1)
PGND(DCPS1)
5VDC(SCDB)
SGND(SCDB)
DB MTXD(SCDB)
(SCDB)
(SCDB)
DB SACK(SCDB)
DB MACK
DB SRXD
MAIN BODY
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.
PAPER SIZE DETECT
SWITCH
PFUDB(UPPER)
DB-208/608
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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