Konica 7045 GUIDE MANUAL 7045020e

UNIT EXPLANATION

1 OUTLINE

2 UNIT EXPLANATION

3 DIS./ASSEMBLY

1 OUTLINE

2 UNIT EXPLANATION

3 DIS./ASSEMBLY

Blank page

EXTERNAL SECTION

[1] Composition

Main power switch

Left side cover

Paper exit cover

Sub power swicth

Operation panel

Front door

ADU

Tray 1

1 OUTLINE

RADF

Right side cover

Rear cover

2 UNIT EXPLANATION

By-pass tray

Paper feed door

3 DIS./ASSEMBLY

2-A-1

1 OUTLINE

2 UNIT EXPLANATION

3 DIS./ASSEMBLY

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DRIVE SECTION

[1] Composition

Scanner motor

Developing motor

1st paper feed motor

[2] Mechanisms

Mechanisms Drum drive *1 Developing drive *1 1st paper feed drive 2nd paper feed, conveyance and fixing drive ADU drive Reversal/paper exit drive

Methods Gear drive Gear drive Timing belt + gear drive Gear drive

Timing belt + gear drive Timing belt + gear drive

1 OUTLINE

Drum motor

Reversal paper exit motor

2 UNIT EXPLANATION

Main motor

3 DIS./ASSEMBLY

*1: Separation of the different parts of the drive

system The drum and developing agitator of this machine are driven by separate motors in order to improve the serviceability of the drum unit and also to improve the developing performance.

2-B-1

DRIVE SECTION

1 OUTLINE

[3] M1 (Main) Control

2 UNIT EXPLANATION

1. Operation

3 DIS./ASSEMBLY

5VDC

SGND

DCPS2

ICBCB

SCDB

M1 (main) is controlled by the PRDB (printer drive board).

M1 is a 24 V drive DC motor which drives the conveyance section, 2nd paper feed section, fixing section and conveyance belt. M1 is PLL-controlled by feedback signals from a speed sensor installed inside M1 itself, maintaining it at a constant speed. M1 goes ON after the specified time from when the Start print button is pressed, and goes OFF again after the specified time from PS16 (registration) going OFF at the final copy exit.

28VDC

PGND

DCPS1

5VDC

SGND

PRDB

24VDC

PGND PGND

5VDC

CONT

LOCK SIG

SGND

M1 CLK

SGND

PS16 SIG

5VDC

PS16

2. Signals

a. Input signals

(1) LOCK SIG (M1 to PRDB)

M1 rotational status detection signal This signal becomes [L] when M1 reaches the set speed.

(2) PS16 SIG (PS16 to PRDB)

Paper detection signal used for detecting the paper feed temporary stop position. PS16 goes ON and outputs [H] when paper is detected at the paper feed temporary stop position.

b. Output signals

(1) CONT (PRDB to M1)

M1 drive control signal [L]: M1 ON [H]: M1 OFF

(2) M1 CLK (PRDB to M1)

Reference clock signal for controlling the speed of M1

2-B-2

DRIVE SECTION

[4] M4 (Drum) Control

5VDC

SGND

DCPS2

ICBCB

M4 (drum) is controlled by the PRDB (printer drive board).

1. Operation

M4 is a 24 V drive DC motor which drives the drum, toner conveyance screw, toner recycle screw and separation claw swing section. M4 is PLL-controlled by feedback signal from a speed sensor installed inside M4 itself, maintaining it at a constant speed. M4 goes ON when the Start button is pressed, and goes OFF again when the final copy has been exited.

SCDB

28VDC

PGND

DCPS1

5VDC

SGND

PRDB

24VDC

PGND

5VDC

CONT

LOCK SIG

SGND

M4 CLK

2. Signals

a. Input signal

(1) LOCK SIG (M4 to PRDB)

M4 rotational status detection signal This signal becomes [L] when M4 reaches the set speed.

b. Output signals

(1) CONT (PRDB to M4)

M4 drive control signal [L]: M4 ON [H]: M4 OFF

1 OUTLINE

2 UNIT EXPLANATION

3 DIS./ASSEMBLY

(2) M4 CLK (PRDB to M4)

Reference clock signal for controlling the speed of M4

2-B-3

1 OUTLINE

2 UNIT EXPLANATION

3 DIS./ASSEMBLY

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READ SECTION

[1] Composition

APS 1 sensor APS 2 sensor

Optics rail (rear)

2nd mirror

Exposure unit

CCD unit

Optics rail (front)

Optics driven sheet (lower)

Exposure unit

Optics driven sheet (upper)

Optics driven sheet (lower)

V-mirror unit

CCD unit

Optics driven sheet (upper)

1 OUTLINE

2 UNIT EXPLANATION

3 DIS./ASSEMBLY

V-mirror unit

3rd mirror

1st mirror

[2] Mechanisms

Mechanisms Light source Exposure Scanning *1

Xenon lamp Slit exposure Platen original scanning: 1st, 2nd and 3rd mirror shift RADF original scanning:

Fixed light source / Original moving Lamp power supply Cooling of optics

Lamp cord Cooling of intake air using a fan

*1: Platen original scanning and RADF original

scanning

a. An original on the original glass is read while

moving the exposure unit and V mirror unit.

b. When reading a RADF original, the exposure unit

and V mirror unit shift to under the original glass (1). Original reading takes place with the original passing over the stationary exposure unit.

Methods

Original glass (1)

V-mirror unit

RADF original

Platen original

Exposure unit

CCD unit

2-C-1

READ SECTION

1 OUTLINE

2 UNIT EXPLANATION

3 DIS./ASSEMBLY

[3] M2 (Scanner) Control

5VDC

SGND

DCPS2

ICB

28VDC

PGND

DCPS1

SCDB

M2 (scanner) is driven by the SCDB (scanner drive board), and is controlled by the ICB (image control board). Related signal is PS3 (optics HP).

1. Operation

a. Operation of M2

M2 is a stepping motor which drives the exposure unit. It rotates in the forward or reverse direction and also changes speed according to the particular scanning control operation. The position of the exposure unit is controlled and monitored by PS3 alone. The drive period and direction of rotation of M2 are controlled by the number of count pulses from when PS3 goes ON or OFF. The ICB continuously monitor the state of motion of M2. It acquires the control timing related to paper feed from the number of drive count pulses. The ICB continuously monitors the motion of M2. It acquires the control timing related to paper feed from the number of drive count pulses.

b. Scanning speed of the exposure unit

Scanning speed

Magnification Forward Return

210 mm/sec (1:1) 862 mm/sec (Max.)

PGND

PGND 24VDC 24VDC 28VDC

PGND

24VDC

A A B B

24VDC

SGND

OPT HOME

5VDC

Scanning speed

PS3

c. Initial operation when power is turned ON

When SW2 (sub power) is turned ON, the exposure unit performs a home position search. The home position search operation differs depending upon whether PS3 is ON or OFF. After the home position search, the exposure unit waits in the platen mode APS read position.

(1) When PS3 is ON

Shading correction read position

Platen APS read position

Reference point

PS3

(2) When PS3 is OFF

Shading correction read position

Platen APS read position

Reference point

d. Shading correction read operation

The white reference plate is glued at the back of the original glass and the shading correction is carried out when the SW2 is turned on and every scanning job.

e. Exposure scan mode

There are two exposure scanning modes, a platen mode and a DF mode. In the platen mode, the exposure unit scans and reads the original in the same way as in a conventional copying machine. In the DF mode, however, the exposure unit remains fixed in the specified position, and instead the RADF conveys the original, causing it to be read.

PS3

2-C-2

READ SECTION

f. Scanning operation during DF mode

The read position in the DF mode is on the paper exit side of PS3 (optics HP). While the exposure unit is moving from the standby position (platen APS read position) to the DF read position, the shading correction read operation takes place. Upon reaching the DF read position, the exposure unit remains there until the original has been read, upon completion of reading, then once again moves to the platen APS read position and goes into a standby status.

DF original read position

Shading correction read position

Platen APS read position

Reference point

PS3

g. Scanning operation during platen copy mode

In the platen mode, the motion of the exposure unit differs depending upon whether the copy density mode is set to AE or Manual. In both cases, a shading correction read operation takes place before the exposure scanning operation starts. After completion of the exposure scanning, then the exposure unit moves to the APS read position and goes into a standby status.

(2) When manual density has been selected

Shading correction read position

PS3

Exposure scan

Platen APS read position

Reference point

(3) Booklet mode (Output 1 to N, AE mode)

Shading correction read position

PS3

AE scan

Exposure scan (rear half)

Exposure scan (front half)

1 OUTLINE

2 UNIT EXPLANATION

3 DIS./ASSEMBLY

(1) AE mode

Shading correction read position

PS3

Reference point

AE scan

Exposure scan

Platen APS read position

Reference point

(4) Booklet mode (Output 1 to N, When manual

density has been selected)

Shading correction read position

PS3

Exposure scan (rear half)

Exposure scan (front half)

Platen APS read position

Reference point

2-C-3

1 OUTLINE

READ SECTION

2. Signals

a. Input signal

(1) OPT HOME (PS3 to SCDB to ICB)

Exposure unit home position detection signal [L]: Exposure unit is in the home position. [H]: Exposure unit is not in the home position.

b. Output signal

(1) A, A, B, B (SCDB to M2)

M2 (scanner) ON/OFF drive signal

[4] Exposure Control

PGND

LAMP ON/OFF

24VDC

DCPS1

28VDC

PGND 24VDC 24VDC

PGND

L1 INVB

2 UNIT EXPLANATION

3 DIS./ASSEMBLY

24V

L1 CONT

ICB

SCDB

Power is supplied to L1 (exposure lamp) from the L1 INVB (L1 inverter) and is controlled by the ICB (image control board) via the SCDB (scanner drive board).

1. Operation

L1 is a xenon lamp which is driven by an inverter circuit. A xenon lamp provides a stable light intensity and also generates relatively little heat, hence it does not require a light intensity control circuit that is used in conventional copying machines, and also protective control that is normally required due to heat generation from the lamp is no longer used.

2. Signals

a. Output signal

(1) LAMP ON/OFF (ICB to SCDB to L1 INVB)

L1 ON/OFF control signal [L]: L1 ON [H]: L1 OFF

2-C-4

READ SECTION

[5] Original Read Control

5VDC

SGND

12VDC

SGND

DCPS2

28VDC

PGND

DCPS1

ICB

GND

SD0

SD1

/SEN

RCK

GND

TCK

GND

CCD

ADB

[6] APS Control

CB DCPS2 DCPS1

ICB

5VDC

SGND

12VDC

SGND

PS3

PS25

PS26

PS4

APS BOOK

SCDB

SGND

OPT HOME

5VDC

APS TIMING

SGND

APS DATA2

5VDC

SGND

APS DATA3

5VDC

28VDC

PGND

ADB

PS3

PS4

PS25

PS26

1 OUTLINE

2 UNIT EXPLANATION

3 DIS./ASSEMBLY

The original is read by the CCD sensor installed on the ADB (A/D converter board).

1. Operation

The light from the exposure lamp reflects back from the original, passes through a lens, and hits the CCD sensor. The CCD sensor generates an anolog electrical signal corresponding to the light intensity. The ADB then converts this signal into a digital signal.

a. Original read operation

The original read timing is as follows.

(1) During a platen copy operation

PS3 (optics HP) goes OFF after the specified time from when the Start button is pressed, and then the exposure unit moves 2 mm to the paper feed side.

(2) During a DF copy operation

After the specified time from the ON of PS308 (original feed detect) by original leading edge.

APS takes place as a result of the signals read by the APS sensors and CCD sensor being sent to the ICB (image control board) when the RADF is opened and closed.

Related signals are PS3, PS4 (APS timing) and PS301 (DF open/close detect).

1. Operation

a. APS detection operation

The APS detection operation differs depending upon whether the platen mode or DF mode is used.

(1) During a DF copy operation

An original size is detected by ON or OFF of PS302 (original size detect 1) and PS303 (original size detect

2) on the paper feed tray of RADF, and resistance value of VR301 (original size detect).

(2) During a platen copy operation

APS detection is used to detect the original size. This is done by combining the ON/OFF signals from PS25 (APS 1) and PS26 (APS 2) with the detection signal from the CCD sensor mounted on ADB.

2-C-5

READ SECTION

1 OUTLINE

2 UNIT EXPLANATION

3 DIS./ASSEMBLY

PS25 (APS 1) and PS26 (APS 2) detect the original size in the sub-scanning direction, and the CCD sensor detects the original size in the main scanning direction. During APS detection, when L1 (exposure lamp) lights, gradations of light intensity occur in the main scanning direction due to the presence of an original. The CCD sensor detects these gradations of light intensity along one line, and the ICB (image control board) judges the size of the original in the main scanning direction from the positional relationship between the two points where the light intensity level switches from black generated by a sky shot to white generated by the edge of the original. Close RADF, then detection of the original size in the main scanning direction takes place once again at the instant PS301 (DF open/close detect) goes ON, and the original size is confirmed. PS25 and PS26 each consist of an LED and a photosensor. Light emitted from each LED is reflected off the original, and received by the photosensor, thus enabling the size of the original to be detected. The PS25 and PS26 consist of LEDs and photosensors. APS detection takes place as a result of the light emitted from each LED being reflected off the original and received by the photosensor.

Sensor

Paper size

B4 A4R B5R

: Paper is detected (ON).

✕ : Paper is not detected (OFF).

b. APS detection timing

The APS detection timing differs depending upon whether the platen mode or the DF mode is used.

(1) During a DF copy operation

When either the DF mode is selected or an original is placed in the RADF paper feed tray, the original size is detected by PS302 (original size detect 1), PS303 (original size detect 2) and VR301 (original size detect).

(2) During a platen copy operation

• When PS4 (APS timing) is ON and PS301 is ON

• If RADF is open, the original size is detected when the Start button is pressed.

PS302

PS25

●

× × ×

PS303

PS26

●

× × × ×

Paper exit side

: Photosensor

: LED

The relation between each sensor and the paper size is shown below.

2-C-6

READ SECTION

ICB

ADB

GND

SD0

SD1

/SEN

RCK

GND

TCK

GND

CCD

28VDC

PGND

DCPS1

5VDC

SGND

12VDC

SGND

DCPS2

2. Signals

a. Input signals

(1) OPT HOME (PS3 to SCDB to ICB)

Exposure unit home position detection signal [L]: Exposure unit is in the home position. [H]: Exposure unit is not in the home position.

(2) APS TIMING (PS4 to SCDB to ICB)

RADF opening/closing detection signal Activates or deactivates the APS function at a platen copy operation. [L]: OFF (APS function deactivated) [H]: ON (APS function activated)

(3) APS DATA 2 (PS25 to SCDB to ICB)

Paper size detection signal [L]: Paper is detected. [H]: Paper is not detected.

(4) APS DATA 3 (PS26 to SCDB to ICB)

Paper size detection signal [L]: Paper is detected. [H]: Paper is not detected.

[7] AE Control

1 OUTLINE

2 UNIT EXPLANATION

3 DIS./ASSEMBLY

When an AE scanning takes place, the CCD sensor installed on the ADB (A/D converter board) reads the original density, and the ICB (image control board) performs processing corresponding to the read results and selects the optimum γ correction curve for the original reproduction. This operation is called AE control. The selection of this γ correction curve is done by the CPU on the ICB.

2-C-7

1 OUTLINE

2 UNIT EXPLANATION

READ SECTION

1. Operation

a. AE detection operation

(1) During a platen copy operation

When the Start button is pressed, an AE scanning takes place, and the density of the original is read over the following range.

1) When RADF is open

Range of non-image area erace mode, or the inside of the area detected by the APS

2) When RADF is closed

• Range of 20 mm inward of the original size detected by the APS

• If the original size cannot be determined by the APS, a range of 20 mm inward of the minimum original size set for the particular shipping destination of the machine.

(2) During a DF copy operation

The image at the leading edge of the original is read

3 DIS./ASSEMBLY

by the original feed operation that takes place when the Start button is pressed, and the read data is used to perform density measurement.

1) Main scanning direction

• A range of 20 mm inward of the original size detected by the APS

• If the original size cannot be determined by the APS, a range of 20 mm inward of the minimum original size set for the particular shipping destination of the machine.

2) Sub scanning direction

Range between 1.5 mm and 2.9 mm from the leading edge of the original

2-C-8

WRITE UNIT

[1] Composition

fθ lens

Polygon mirror

Dust-proof glass

Write mirror

Cylindrical lens 2

Collimator lens unit

Cylindrical lens 1

1 OUTLINE

Index mirror

Index sensor board

2 UNIT EXPLANATION

Laser drive board

3 DIS./ASSEMBLY

[2] Mechanisms

Mechanisms Methods

Scan *1 Polygon mirror

Rotational speed:

· 49606.3 rpm

Light source Laser diode (1)

· Output : Max. 5 mW

· Wavelength : 780 nm

Positioning Index sensor

*1: Path of laser beam

The light output from the semiconductor laser is sent to the OPC drum via the collimator lens, cylindrical lens 1, polygon mirror, f write mirror.

lens, cylindrical lens 2, and

Polygon mirror

Cylindrical lens 1

Collimator lens unit

Polygon mirror

fθ lens

Laser diode

Cylindrical lens 2

Dust-proof glass

Cylindrical lens 2

Write mirror

Dust-proof glass

Index mirror

Index sensor board

Write mirror

OPC drum

2-D-1

WRITE UNIT

1 OUTLINE

2 UNIT EXPLANATION

3 DIS./ASSEMBLY

[3] M5 (Polygon) Control

POLY CONT

POLY PLL LOCK

POLY CLK

SCDB

24VDC

PGND

DCPS1

M5 (polygon) is driven by the PMDB (Polygon motor drive board), and is controlled by the SCDB (scanner drive board).

1. Operation

a. M5 is a 3-phase brushless DC motor which is driven

using a 3-phase bipolar method. The current flowing through the windings is switched according to the position of the rotor which is detected by a sensor (magnetic sensor) inside the motor. This motor rotates the polygon mirror, causing the laser beam from LDB (lazer drive board) to be scanned in the axial direction of the drum. The speed of the motor is maintained constant by PLL control.

b. M5 is powered by 24 VDC. The rotational speed is

as follows.

PMDB

M5 DRIVE A

M5 DRIVE B

M5 DRIVE C

M5 MAG C

M5 MAG C'

M5 MAG B

M5 MAG B'

M5 MAG A

M5 MAG A'

12VDC

SGND

2. Signals

a. Input signals

(1) POLY PULL LOCK (PMDB to SCDB)

M5 rotation speed monitoring signal [L]: Normal rotation [H]: Stop or rotation abnormality

(2) M5 MAG A/A' (M5 to PMDB)

M5 MAG B/B' (M5 to PMDB) M5 MAG C/C' (M5 to PMDB) These are output signals from the position sensors (magnetic sensors) installed inside M5. The PMDB detects the position of the rotor of the motor by means of these signals, and switches over the M5 DRIVE A to C output.

b. Output signals

(1) POLY CONT (SCDB to PMDB)

This signal controls the ON/OFF state of M5. [L]: M5 ON [H]: M5 OFF

(2) POLY CLK (SCDB to PMDB)

This is a reference clock signal for PLL-controlling M5 in the PMDB.

(3) M5 DRIVE A to C (PMDB to M5)

This is the drive output signal for M5. While M5 is rotating, voltages are output sequentially from M5 DRIVE A to C, and applied to M5. The voltage from each output that is applied to M5 consists of the pulses shown below. The pulse width of this output changes according to the rotation condition of M5, as shown in the figure, and as a result the RMS value of the voltage applied to M5 changes, causing the speed to be regulated.

State of the machine During copy

Rotational speed

49606.3 rpm One of the following three speeds can be selected

During idling

using the “25” mode.

• 49606.3 rpm

• 25000 rpm *

• Stop *

* If the item marked * is selected, the rotational

speed of M5 switches over after the lapse of the specified time from the completion of the warm-up or the end of the copy process.

The specified time can be selected using the “25” mode among below.

· 15 sec, 30 sec, 60 sec, 120 sec

2-D-2

WRITE UNIT

[4] Image Write Control

5VDC

SGND

/S/H

/ENB

/VIDEO

VIDEO

/ALM

N.C.

DACLK

5VDC

LDB

5VDC

SGND

/INX

SGND

IDPR 5VDC

INDEXSB

ADB

The analog image data from the CCD sensor is A/Dconverted and processed by the ADB (A/D converter board). The processed image data is memorized by the CB (control board), then returned to the ICB (image control board) once again and converted into a laser record signal. The laser record signal is transmitted via the CB to the LDB (Laser drive board) by the control signal from the ICB, and output as an optical signal from the laser installed on the LDB. The write start position of the laser record signal is detected by INDEXSB (index sensor board).

1. Operation

a. Image processing

The following processing is carried out by the ICB.

(1) AOC (Automatic Offset Correction)

IC on ADB automatically adjusts analog off set voltage of CCD sensor output.

ICB

(3) Shading correction

<Implementation timing> White correction, Black correction

• When SW2 is ON

• Before job

(4) Brightness/density conversion (5) AE processing (6) Text/dot pattern judgement (7) Filtering (8) Magnification change processing (9) Copy γ correction (10) Write density control

b. Write

The ICB sends image data one pixel at a time to LDB in accordance with control signals from the CB. LDB cause the laser to emit at a time period corresponding to the image data. This laser light is applied to the drum.

(1) MPC (Maximum Power Control)

The ICB instructs the LDB to cause the laser to output the maximum power output value, thus setting the maximum output value. The LDB stores this setting, and maintains the laser light intensity stored by means of the APC (Automatic Power Control) operation.

• When SW2 is turned ON.

(2) APC (Automatic Power Control)

The ICB outputs an APC start instruction to the LDB at the following timing, after MPC is set.

• When PLL lock of M5 (polygon) is detected. After PLL lock is detected, the LDB automatically monitors the laser drive current one line at a time, and controls it so that the light intensity remains the MPC value.

(3) Write Timing

In this machine, the INX signal from INDEXSB determines the laser write start timing for each scan in the axial direction of the drum.

1 OUTLINE

2 UNIT EXPLANATION

3 DIS./ASSEMBLY

(2) AGC (Automatic Gain Correction)

When SW2 (sub power) is turned ON, the white reference plate is read, and the amplification of the analog output from the CCD sensor is automatically adjusted so that the resulting level is the upper limit of the A/D converter.

2-D-3

1 OUTLINE

2 UNIT EXPLANATION

WRITE UNIT

2. Signals

a. Input signals

(1) INX (INDEXSB to CB to ICB)

Write system index signal

(2) IDPR (INDEXSB to CB to ICB)

5 VDC power monitoring signal for INDEXSB (index sensor board)

(3) ALM (LDB to CB to ICB)

Signal which indicates an abnormality in the laser drive current (APC operation). [L]: Abnormal [H]: Normal

b. Output signals

(1) VIDEO (ICB to CB to LDB)

Laser image data signal

(2) DA CLK (ICB to CB to LDB)

Data transfer clock signal for MPC setting value

(3) DI (ICB to CB to LDB)

Data signal of MPC setting value

(4) LD (ICB to CB to LDB)

3 DIS./ASSEMBLY

Storage directive signal for MPC setting value

(5) S/H (ICB to CB to LDB)

APC sampling signal for one line scan

(6) ENB (ICB to CB to LDB)

Laser APC function ON/OFF control signal While this signal is OFF then the laser beam output is prohibited.

2-D-4

DRUM UNIT

[1] Composition

Developing unit

Cleaning unit

Charging corona unit

Cleaning unit

Transfer/separation corona unit

Charge cleaning knob

PCL

Charging corona unit

TSL

1 OUTLINE

Separation claws

2 UNIT EXPLANATION

Drum

Developing unit

Drum

3 DIS./ASSEMBLY

[2] Mechanisms

Mechanisms Carriage support PCL Auxiliary separation

The drum unit of this machine is an integral assembly consisting of the drum, and also the charging corona unit, developing unit, cleaning unit, toner recycle unit and the PCL which are installed around the drum.

Methods Fixed rail LED Separation claws

2-E-1

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