Konica 7045 GUIDE MANUAL db208e

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
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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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