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 OUTLINE

III DIS./ASSEMBLY II UNIT EXPLANATION

iii

CONTENTS

I OUTLINE

III DIS./ASSEMBLY II UNIT EXPLANATION

Blank page

iv

DB-411 PRODUCT SPECIFICATIONS

I	OUTLINE
1. 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/m2 to 105g/m2 (16lbs to 24lbs), high-quality paper
Maximum tray capacity:		1500 sheets (80g/m2 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
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.

I OUTLINE

1-1

I OUTLINE

CENTER CROSS-SECTIONAL DIAGRAM

2. CENTER CROSS-SECTIONAL DIAGRAM

[4]	[5]	[6]	[1]
	[3]		[2]

[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

3. DRIVE SYSTEM DIAGRAM

[5]	[6]
	[1]
[4]	[3]
	[2]

[1]SD101 (Paper feed solenoid /U)

[2]Paper lift plate

[3]M101 (Tray up drive motor /3)

[4]M100 (DB paper feed motor)

[5]Conveyance roller

[6]Feed roller

1-2

PAPER FEED SECTION

II UNIT EXPLANATION

1. PAPER FEED SECTION

1.1Composition

[9]	[10] [11]					[1]

M100

DBDB

SD101

[8] [7]				[6] [5]	[4]		[3]	[2]
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 conveyance
[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

II UNIT EXPLANATION

PAPER FEED SECTION

1.2Operation

1.2.1Tray up drive control

When the paper feed tray is set, the PS101 (Tray sensor /3) detects the tray to turn on the M101 (Tray up drive motor /3). As a result, the wire is wound up to lift the tray.

When the PS102 (Tray upper limit sensor /3) is turned on to detect the paper upper limit, the M101 goes off. When paper is fed and the PS102 is turned off, the M101 lifts the paper lift plate 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.

1.2.2Paper feed control

The paper feed system is driven by the M100 (DB paper feed motor). When the SD101 (Paper feed solenoid /U) is turned on, the 1st paper feed section feeds paper to the registration section.

1.2.3Remaining 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 lift plate that goes up, the actuator at the rear of the tray rotates. The remaining paper quantity is detected by the combination of the PS101 and the PS109 when they are turned 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

PAPER FEED SECTION

[4]

	[1]
	[3]
[5]	[2]
[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

1.2.4Paper 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 board) detects a switch signal according to the position of the SW1. The table below shows the relationship between the switch signal and the paper size.

	Paper size		Switch signal
		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

II UNIT EXPLANATION

2-3

PAPER FEED SECTION

II UNIT EXPLANATION

Blank page

2-4

PAPER FEED SECTION

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

1.1Removing and reinstalling the tray front cover and the paper feed tray

1.Pull out the paper feed tray and take out the 5 screws [1] and remove the tray front cover [2].

2.Remove the 5 screws [2] from the guide rails [1] and remove the paper feed tray [3] from the guide rails.

3.Reinstall the above parts following the removal steps in reverse.

[1]
	[1]	DIS./ASSEMBLY
[2]
		III
[2]
[3]

[1]

[2]

3-1

PAPER FEED SECTION

1.2Removing 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].

III DIS./ASSEMBLY

4.Remove the 3 screws [1] and remove the cover [2].

5.Remove the paper size setting unit connector [3].

[4]
	[3]
[2]
[1]
	[1]
	[3]
[1]	[2]

3-2

PAPER FEED SECTION

6.When the LT is installed, remove the screw [1] and then remove the LT guide plate unit [2].

[2] [1]

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 removal steps in reverse.

Note:

•Be sure to install the paper feed unit [2] so 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 unit [2] so that the hook [5] of the paper feed roller holder comes above the paper feed roller release arm [6].

			[6]	[5]
				DIS./ASSEMBLYIII
	[3]	[2]	[3]
[1]			[4]

3-3

III DIS./ASSEMBLY

PAPER FEED SECTION

1.3Replacing the paper feed rubber and the feed rubber / U

A. Periodically replaced parts/cycle

•Paper feed rubber: Every 240,000 copies (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 rings [1] and the front side bearing [2]. Then slide the rear side bearing [3] to the rear to remove the paper feed roller unit [4].

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 pull out the paper feed shaft [6].

6.Remove the paper feed rubber [8] from the paper feed roller [7].

7.Reinstall the above parts following the removal steps in reverse.

Note:

•Be sure to install the feed rubber [4] so that the paint mark [9] turns in the direction shown in the drawing.

[3]

[4]

[2]

[1]

[7]

[8]

[6] [2]

[1]

[9] [5]

[4]

[3]

3-4

PAPER FEED SECTION

1.4Replacing the double feed prevention rubber

A. Periodically replaced parts/cycle

•Double feed prevention 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 screw [1].

3.Pushing the knobs [2] on both sides with your fingers and remove the double feed prevention roller unit [3].

[3]

[2]

[1]

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 removal steps in reverse.

Note:

•Be sure to install the double feed prevention rubber so that the paint mark [5] shown above turns in the direction shown in the drawing.

•When installing the double feed prevention roller unit [1], be sure to align the upper section of the claw [2] with the center (the longest scale) of the marking [3] impressed on the plate for leveling.

[4]

[5]

[3]

[2]

[1]

[1]

[3]

[2]

III DIS./ASSEMBLY

3-5

PAPER FEED SECTION

1.5Replacing 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 paper 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 pro-
	tective cover [4] on the rear side.
III DIS./ASSEMBLY
	[2]		[4]
		[1]	[3]

3-6