Page 1
DB-208/208A
SERVICE HANDBOOK
Sep. 2000
Ver. 1.0
KONICA CORPORATION
TECHNOLOGY SUPPORT CENTER
TOKYO JAPAN
Page 2
KONICA CORPORATION
COPYRIGHT ©2000
CN55YF1300
Page 3
CONTENTS
CONTENTS
SAFETY AND IMPORTANT WARNING ITEMS .............
Refer to the 7045 service handbook on page C-1
1. OUTLINE
DB-208/208A PRODUCT SPECIFICATIONS ........ 1-1
CENTER CROSS-SECTIONAL VIEW ................... 1-2
DRIVE SYSTEM DIAGRAM ................................... 1-2
2. UNIT EXPLANATION
PAPER FEED UNIT ............................................... 2-1
[1] Composition ............................................ 2-1
[2] Mechanisms ........................................... 2-1
[3] Paper Feed and No-Paper Detection
Control .................................................... 2-2
[4] Tray Up Control ...................................... 2-4
[5] Paper Size Detection Control ................. 2-6
3. DISASSEMBLY/ASSEMBLY
DISASSEMBLY AND REASSEMBLY .................... 3-1
[1] Removing and Reinstalling the Paper
Feed Tray ............................................... 3-1
[2] Removing and Reinstalling the Paper Feed
Unit ......................................................... 3-1
[3] Replacing the Separation Rubber and the
Paper Supply Rubber ............................. 3-2
[4] Removing and Reinstalling the Double-Feed
Prevention Roller .................................... 3-2
1 OUTLINE
2 UNIT EXPLANATION
3 DIS./ASSEMBLY
Page 4
1 OUTLINE
2
2 UNIT EXPLANATION
3 DIS./ASSEMBLY
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Page 5
1
OUTLINE
1 OUTLINE
2 UNIT EXPLANATION
3 DIS./ASSEMBLY
Page 6
1 OUTLINE
2
2 UNIT EXPLANATION
3 DIS./ASSEMBLY
Blank page
Page 7
DB-208/208A PRODUCT SPECIFICATIONS
DB-208/208A
1. Type
Type: Paper feed tray (front loading)
2. Functions
Paper size: A3/B4/A4/A4R/B5/B5R/A5R/
8.5 x 11/8.5 x 11R/8.5 x 14
Paper type: 60 g/m2 to 90 g/m2 high-quality
paper
Maximum
paper storage: DB-208 (500 sheets x 3, 80 g/m
DB-208A (500 sheets x 1, 80 g/m2)
3. Particulars of Machine
Power: 24/5 V DC (supplied from main
body)
Power
consumption: Maximum 40 VA
Weight: DB-208 Approx. 22 kg
DB-208A Approx. 16 kg
Machine
dimensions: Width 610mm
Depth 587mm
Height 430mm
1 OUTLINE
2
)
2 UNIT EXPLANATION
3 DIS./ASSEMBLY
4. Maintenance and Life
Maintenance: Same as the main body
Machine life: Same as the main body
5. Operating Environment
Temperature: 10°C to 30°C
Humidity: 10% to 80% RH
Note: These specifications are subject to change
without notice.
1-1
Page 8
1 OUTLINE
2
DB-208/208A
CENTER CROSS-SECTIONAL VIEW
Separation roller
Paper feed roller
Conveyance rollers (upper)
Double-feed
prevention roller
2 UNIT EXPLANATION
3 DIS./ASSEMBLY
DRIVE SYSTEM DIAGRAM
Paper lift-up plate
Paper lift-up lever
Conveyance
rollers (middle)
Conveyance
rollers (lower)
Note: This drawing is for DB-208 (three-tray type).
DB-208A (single-tray type) has only the
top tray shown in this drawing
Paper feed motor (M401)
Up/down motor (U) (M402)
Up/down motor (M) (M403) (DB-208 only)
Up/down motor (L) (M404) (DB-208 only)
Intermediate
conveyance rollers
Separation roller
Double-feed prevention roller
Paper feed roller
Note: This drawing is for DB-208 (three-tray type).
DB-208A (single-tray type) has only the
top tray shown in this drawing
1-2
Page 9
2
UNIT EXPLANATION
1 MAIN BODY
2 UNIT EXPLANATION
3 DIS./ASSEMBLY
Page 10
1 MAIN BODY
2
2 UNIT EXPLANATION
3 DIS./ASSEMBLY
Blank page
Page 11
PAPER FEED UNIT
DB-208/208A
[1] Composition
Paper feed roller
Separation roller
Double-feed
prevention roller
Guide release lever
Front cover
Paper feed trays
Intermediate
conveyance rollers
Paper feed door
1 MAIN BODY
2 UNIT EXPLANATION
3 DIS./ASSEMBLY
Rear edge stopper
Paper feed tray
[2] 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
Side guide
Note: This drawing is for DB-208 (three-tray type).
DB-208A (single-tray type) has only the
top tray shown in this drawing
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
2-1
Page 12
DB-208/208A
[3] Paper Feed and No-Paper Detection Control
1 MAIN BODY
2
2 UNIT EXPLANATION
3 DIS./ASSEMBLY
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.
2-2
Page 13
DB-208/208A
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)).
1 MAIN BODY
2 UNIT EXPLANATION
3 DIS./ASSEMBLY
[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.
2-3
Page 14
DB-208/208A
[4] Tray Up Control
1 MAIN BODY
2
2 UNIT EXPLANATION
3 DIS./ASSEMBLY
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.
2-4
Page 15
DB-208/208A
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) t o 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.
1 MAIN BODY
2 UNIT EXPLANATION
3 DIS./ASSEMBLY
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
2-5
Page 16
DB-208/208A
[5] Paper Size Detection Control
1 MAIN BODY
2
2 UNIT EXPLANATION
3 DIS./ASSEMBLY
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.
2-6
Page 17
3
DISASSEMBLY/ASSEMBLY
1 MAIN BODY
2 UNIT EXPLANATION
3 DIS./ASSEMBLY
Page 18
1 MAIN BODY
2
2 UNIT EXPLANATION
3 DIS./ASSEMBLY
This section covers the structure, functions, operation and method of
disassembling and assembling the machine.
Observe the following precautions when performing disassembly and
assembly work.
1. Be sure to unplug the power cord before working on the machine.
2. Perform all reassembly work by reversing the order in which the
componet was disassembled, unless otherwise specified.
3. Do not lose small parts (screws, etc.) or insert them in the wrong
place.
4. Install all parts completely before operating the machine.
5. Do not loosen the screws indicated as disallowed for removal.
Page 19
DISASSEMBLY AND REASSEMBLY
DB-208/208A
CAUTION: Ensure the power cord is unplugged
.
from the socket.
[1] 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
[2] 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
1 MAIN BODY
2 UNIT EXPLANATION
3 DIS./ASSEMBLY
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.
3-1
Page 20
DB-208/208A
[3] Replacing the Separation Rubber
1 MAIN BODY
a. Procedure
2
(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
2 UNIT EXPLANATION
3 DIS./ASSEMBLY
and the Paper Supply Rubber
roller from the paper feed roller unit.
Paper
feed shaft
Separation
roller
Separation
rubber
Marking
[4] 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
prevention spring
Shaft
Rocking
shaft
Paper feed
roller unit
Shaft
bushing
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
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.
(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
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.
3-2
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