Konica Minolta DB-411 User Manual
SERVICE MANUAL
MODEL
DB-411
Drawer Base Unit
NOVEMBER 2002
CSM-DB411
DB-411
SERVICE MANUAL
Used On Model 7145
November 2002
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 Publishing Department
© 2002, KONICA BUSINESS TECHNOLOGIES, INC.
All rights reserved.
Printed in U.S.A.
CONTENTS
CONTENTS
SAFETY AND IMPORTANT WARNING ITEMS
Refer to the 7145 service manual on page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-1
I OUTLINE
1. DB-411 PRODUCT SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
2. CENTER CROSS-SECTIONAL DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
3. DRIVE SYSTEM DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
II UNIT EXPLANATION
1. PAPER FEED SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
1.1 Composition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
1.2 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
1.2.1 Tray up drive control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
1.2.2 Paper feed control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
1.2.3 Remaining paper detection control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
1.2.4 Paper size detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
III DISASSEMBLY/ASSEMBLY
1. PAPER FEED SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
1.1 Removing and reinstalling the tray front cover and the paper feed tray . . . . . . . . . . . . . . . . . . . . 3-1
1.2 Removing and reinstalling the paper feed unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
1.3 Replacing the paper feed rubber and the feed rubber /U . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
1.4 Replacing the double feed prevention rubber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
1.5 Replacing the wires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
I OUTLINEII UNIT EXPLANATIONIII DIS./ASSEMBLY
iii
CONTENTS
I OUTLINEII UNIT EXPLANATIONIII DIS./ASSEMBLY
Blank page
iv
I OUTLINE
1. DB-411 PRODUCT SPECIFICATIONS
DB-411 PRODUCT SPECIFICATIONS
A. Type
Type: Front loading type paper feed tray
B. Functions
Paper size: A4, A4R, B5, B5R, 8.5 x 11, 8.5 x 11R
Applicable copy paper: 60g/m
Maximum tray capacity: 1500 sheets (80g/m
2
to 105g/m2 (16lbs to 24lbs), high-quality paper
2
or 20lbs)
C. Machine data
Power source: 24VDC/5V (supplied from the main body)
Power consumption: Maximum 40VA (when the heater available optionally in the field is not
used.)
Weight: Approx. 24.5kg
Dimensions: 580mm (W) x 595mm (D) x 311mm (H)
D. Maintenance and life
I OUTLINE
Maintenance: Same as the main body
Machine service life: Same as the main body
E. Operating environment
Temperature: 10°C to 30°C (50°F to 86°F)
Humidity: 10% RH to 80% RH
Note:
• The information herein may be subject to change for improvement without notice.
1-1
CENTER CROSS-SECTIONAL DIAGRAM
2. CENTER CROSS-SECTIONAL DIAGRAM
I OUTLINE
[4]
[1] Conveyance roller [4] Paper lift plate
[2] Paper feed path for the double sided copy [5] Paper feed roller
[3] Double feed prevention roller [6] Feed roller
[5]
[6]
[3]
[1]
[2]
3. DRIVE SYSTEM DIAGRAM
[4]
[6]
[1]
[3]
[5]
[2]
[1] SD101 (Paper feed solenoid /U) [4] M100 (DB paper feed motor)
[2] Paper lift plate [5] Conveyance roller
[3] M101 (Tray up drive motor /3) [6] Feed roller
1-2
II UNIT EXPLANATION
1. PAPER FEED SECTION
1.1 Composition
PAPER FEED SECTION
[1][11][10][9]
M100
DBDB
SD101
[3] [2][4][5][6][7][8]
Symbol Name Function or method
[1] Conveyance roller Paper conveyance
[2] PS105 (Paper feed sensor /L) Paper feed door open/close detection
[3] Double feed prevention roller Prevent double feed of paper, Torque limiter
[4] M101 (Tray up drive motor /3) Tray drive, 24VDC brush motor
[5] PS102 (Tray upper limit sensor /3) Detection of the tray paper upper limit
[6] PS103 (No paper sensor /3) Detection of the presence of paper
[7] PS101 (Tray sensor /3) Tray detection and remaining paper detection
[8] PS 109 (Remaining paper sensor) Remaining paper detection
[9] Paper feed roller Paper conveyance
[10] Feed roller Paper conveyanc e
[11] PS104 (Paper feed sensor /U) Detection of the paper passage from the tray
M100 DB paper feed motor Driving of the paper feed system, DC brushless motor PLL
control
SD101 Paper feed solenoid /U Transmission of driving force to the paper feed roller unit
II UNIT EXPLANATION
2-1
PAPER FEED SECTION
1.2 Operation
1.2.1 Tray up drive control
When the paper feed tr ay is set, the PS101 (Tray sensor /3) de tec ts the tr ay to t ur n on the M1 01 (Tray up
drive motor /3). As a result, the wire is wound up to lift the tray.
When the PS1 02 (Tray upper limi t sensor /3) is turn ed on to de tect th e paper upper li mit, the M1 01 goes
off. When paper is fed and the PS102 is turned off, the M101 lifts the paper lift plat e until the PS102 is
turned on again. When the tray is pulled out, the coupling is released and the paper lift plate goes down by
its own weight.
1.2.2 Paper feed control
The paper feed system i s driven by the M100 (D B paper feed motor ). When th e SD101 (Pape r feed solenoid /U) is turned on, the 1st paper feed section feeds paper to the registration section.
II UNIT EXPLANATION
1.2.3 Remaining paper detection control
The remaining paper quantity is detected by the PS101 (Tray sensor /3) and the PS109 (Remaining paper
sensor). The paper lift plate goes up gradually as the quantity of paper in the tray is getting reduced. Interlocking with the paper l ift plate that goes up, th e actuat or at t he rear of the tray rotates . The remaining
paper quantity is det ected by the combina tion of the PS101 and th e PS109 whe n they are tur ned on and
off by the actuator.
No paper detection is made by the PS103 (No paper sensor /3).
Remaining paper in the tray PS101 PS109
Full !
Medium !!
Low !
! : Sensor ON
2-2
[3]
PAPER FEED SECTION
[4]
[1]
[5]
[1] PS109 (Remaining paper sensor) [4] Rotating direction when the tray goes up
[2] PS101 (Tray sensor /3) [5] PS103 (No paper sensor/3)
[3] Actuator
1.2.4 Paper size detection
The paper size in the tray can be set by turning the PSDTB /3 (Paper size detection board /3) by hand, and
the DBDB (DB drive b oard) d etects a swit ch sign al acc ording to th e positio n o f the SW 1. The tab le bel ow
shows the relationship between the switch signal and the paper size.
Switch signal
Paper size
SIZE A SIZE B SIZE C SIZE D
A4 !
A4R !
8.5 x 11 !!
8.5 x 11R !
B5R !!
B5 !!
A4 !!!
A4R !
8.5 x 11 !!
8.5 x 11R
[2]
II UNIT EXPLANATION
2-3
PAPER FEED SECTION
II UNIT EXPLANATION
Blank page
2-4
III DISASSEMBLY/ASSEMBLY
Caution:
• Make sure the power cord of the copier is
unplugged from the power outlet before disassembly or assembly.
1. PAPER FEED SECTION
1.1 Removing and reinstalling the tray front cover and the paper feed tray
PAPER FEED SECTION
1. Pull out the paper fee d tray and take out the 5
screws [1] and remove the tray front cover [2].
2. Remove the 5 screws [2] from the guide rai ls [1]
and remove the paper feed tray [3] from the
guide rails.
3. Reinstall the above parts following the remova l
steps in reverse.
[3]
[1]
[1]
[2]
III DIS./ASSEMBLY
[2]
[1]
3-1
[2]
PAPER FEED SECTION
1.2 Removing and reinstalling the paper feed unit
1. Remove the paper feed tray.
2. Remove the 4 claws [1] in the arrow-marked
direction, and remove the tray cover [2].
3. Open the paper feed door, take out the 3 screws
[3] and remove the paper size setting unit [4].
[4]
[3]
[2]
[1]
III DIS./ASSEMBLY
[1]
4. Remove the 3 screws [1] and remove the cover
[2].
5. Remove the paper size setting unit connector
[3].
[1] [2]
[3]
3-2
6. When the LT is installed, remove the screw [1]
and then remove the LT guide plate unit [2].
PAPER FEED SECTION
7. Remove the screws [1] indicated by the arrow
mark, and then remove the paper feed unit [2] to
forward.
8. Reinstall the above parts following the remova l
steps in reverse.
Note:
• Be sure t o install the paper feed unit [2] s o that
the arrow mark impressed on the notched section
[3] of the paper feed unit [2] comes above the
hook [4].
• Install the paper feed un it [2] so that th e hook [5]
of the paper feed rol ler holder comes above the
paper feed roller release arm [6].
[1]
[3]
[2]
[2]
[1]
[6] [5]
III DIS./ASSEMBLY
[3]
[4]
3-3
PAPER FEED SECTION
1.3 Replacing the paper feed rubber and the feed rubber / U
A. Periodically replaced parts/cycle
• Paper feed rubber: Every 240,000 cop ies (once
for every 200,000 copies for actual durable
count)
• Feed rubber: Every 240,000 copies (once for
every 200,000 copies for actual durable count)
B. Procedure
1. Remove the paper feed unit.
2. Remove the 2 stop ri ngs [1] and the front side
bearing [2]. Then slide the re ar side bearing [3]
to the rear to remove the paper fee d roller unit
[4].
[3]
[4]
[2]
[1]
III DIS./ASSEMBLY
3. Remove the collar [1] and pull out the feed shaft
[2].
4. Remove the feed rubber [4] from the feed roller
[3].
5. Remove the stop ring [5] and pul l out the paper
feed shaft [6].
6. Remove the paper feed rubber [8] from the
paper feed roller [7].
7. Reinstall the above par ts following the removal
steps in reverse.
Note:
• Be su re to install the feed rubber [4] so that the
paint mark [9] turns in the direction show n in the
drawing.
[9]
[5]
[8]
[7]
[6]
[2]
[1]
[4]
[3]
3-4
1.4 Replacing the double feed prevention rubber
A. Periodically replaced parts/cycle
• Double feed prevention rubber: Every 240,000
copies (once for every 2 00,000 cop ies for actua l
durable count)
B. Procedure
1. Remove the paper feed unit.
2. Remove the screw [1].
3. Pushing the knobs [2] on both sides with your
fingers and remove the double feed prevention
roller unit [3].
PAPER FEED SECTION
[3]
[2]
4. While pushing the lever [2] of the lever click
shaft [1], pull out the lever click shaft [1] and
remove the double feed prevention roller.
5. Remove the double feed prevention rubber [4]
from the double feed prevention roller [3].
6. Reinstall the above parts following the remova l
steps in reverse.
Note:
• Be su re to in stall the double f eed preven tion rub ber so that the paint mark [5 ] shown abo ve turns
in the direction shown in the drawing.
• When ins talling the double feed preventi on roller
unit [1], be sure to align the upper section of the
claw [2] with the center (the lo ngest scale) of the
marking [3] impressed on the plate for leveling.
[5]
[1]
[4]
III DIS./ASSEMBLY
[3]
[2]
[1]
[1]
[3]
[2]
3-5
PAPER FEED SECTION
1.5 Replacing the wires
Wire lengths
Wire A : 526.9mm
Wire B : 301.9mm
Wire C : 325.8mm
Wire D : 431.3mm
Assist wire : 253.2mm
Detection wire : 403.1mm
A. Removing the wires
1. Remove the tray front cover and the pap er feed
tray.
2. Remove the screw [1] and remove front and
rear wire protection covers [2].
3. Remove the screw [3], and remove the wire protective cover [4] on the rear side.
III DIS./ASSEMBLY
[2]
[1]
[3]
[4]
3-6
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