Konica 7022 UNIT EXPLANATION 7020020e

UNIT EXPLANATION

1 OUTLINE

2 UNIT EXPLANATION

3 DIS./ASSEMBLY

EXTERNAL SECTION

[1] Composition

Sub power switch (SW2)

Main power switch (SW1)

1 OUTLINE

Platen cover (Option)

Operation panel

Exit tray

2 UNIT EXPLANATION

Front door

Upper tray

Lower tray

3 DIS./ASSEMBLY

By-pass tray

KRDS interface (serial)

ISW interface (parallel)

REVISED EDITION

ADU door

DATE

Jan. 2002

2-A-1

PA GE

2-A-1

Rear cover

METHOD

REPLACEMENT

DRIVE SECTION

[1] Composition

Main motor (M1)

Paper feed drive motor (M9)

Toner supply motor 1 (M4)

Toner supply motor 2 (M10)

* Other than 7020/25/30

Developing motor (M3)

1 OUTLINE

2 UNIT EXPLANATION

3 DIS./ASSEMBLY

[2] Mechanisms

Mechanism Method Drum, Conveyance, Gear drive (M1) Developer agitation, Fixing, and exit drive, ADU conveyance drive, IT conveyance/exit drive (when installing IT) Developing sleeve drive Gear drive (M3) Paper feed drive, ADU Gear drive (M9) conveyance drive Toner supply drive Gear drive (M4) Toner bottle rotation drive Gear drive (M10)

(Other than 7020/25/30)

ADU drive Gear drive (M6) *1

ADU motor (M6)

REVISED EDITION

DATE

Jan. 2002

2-B-1

PAG E

2-B-1

METHOD

REPLACEMENT

DRIVE SECTION

1 OUTLINE

2 UNIT EXPLANATION

3 DIS./ASSEMBLY

[3] M1 (main motor) control

24VDC 24VDC

PGND PGND

SGND

5VDC

DCPS

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

1. Operation

M1 is a brushless motor running on 24 VDC. It drives the 2nd paper feed, fixing, drum, toner conveyance screw and toner recycle screw, and also drives part of the developer agitation screw, IT drive coupling and the ADU conveyance section.

PRDB

24VDC 24VDC

PGND PGND

LOCK SIG

M1 CLK

M1 CONT

5VDC

SGND

5VDC

PS2

SGND

PS3

5VDC

PS2

PS3

7020/25/30/35

2. Signals

a. Input signals

(1) LOCK SIG (M1 → PRDB)

A monitoring signal for the rotation of M1.

Goes [L] when M1 rotation reaches the rated speed.

[H]: Stopped, or rotating at other than rated speed.

[L]: Rotating at rated speed. (PLL: stable)

(2) PS2 (PS2 → PRDB)

Paper fixing unit exit passage detection signal

[H] when paper is detected.

(3) PS3 (PS3 → PRDB)(Only for 7020/25/30/35)

Paper exit passage detect signal

b. Output signals

(1) M1 CONT (PRDB → M1)

M1 drive control signal.

[L]: M1 ON

[H]: M1 OFF

(2) M1 CLK (PRDB → M1)

Reference clock for M1 rotation control.

When IT is installed, M1 drives IT conveyance section and also drives the paper exit section via the IT drive coupling.

M1 includes an internal speed sensor, and utilizes PLL control to maintain constant speed. Rotational speed is controlled by a reference clock signal output by PRDB.

M1 comes ON when the START button is pressed, and

goes OFF at a predetermined time interval after PS3 (paper exit PS) (PS2 (fixing exit PS) in the case of machines other than 7020/25/30/35) goes OFF for the final copy.

At warm-up start, M1 comes ON. only during initial drum charging.

REVISED EDITION

DATE

Jan. 2002

2-B-2

PA GE

2-B-2

METHOD

REPLACEMENT

READ SECTION

[1] Composition

V mirror unit

2nd mirror

3rd mirror

V mirror unit

CCD unit (AD converter board (ADB))

1st mirror

Home-position sensor (PS14)

Exposure unit

APS sensors 1 and 2 *

Optics wires

Optical motor (M2)

* : APS sensor 1 (PS17) is not installed on the 7022/7130.

(PS17, PS18)

Exposure-lamp inverter (INV1)

Scanner drive board (SCDB)

1 OUTLINE

2 UNIT EXPLANATION

3 DIS./ASSEMBLY

[2] Mechanisms

Mechanism Method

Light source Xenon lamp

Exposure Light source slit exposure

Scanning * Platen original scanning:

Movement of 1st, 2nd, and 3rd mirrors.

RADF original scanning: Original is moved with light source held stationary.

Lamp power supply Lamp cord

* Platen and RADF scans operate as follows.

a. Platen original: The original is placed on the platen

glass, and reading is accomplished by movement of the exposure unit and V mirror unit.

b. RADF original: The exposure unit and V mirror unit

are shifted under slit glass, and the original is scanned as it passes over the exposure unit.

Slit glass

V mirror unit

Platen original

RADF original

Exposure unit

CCD unit

REVISED EDITION

DATE

Jan. 2002

2-C-1

PA GE

2-C-1

METHOD

REPLACEMENT

READ SECTION

1 OUTLINE

2 UNIT EXPLANATION

3 DIS./ASSEMBLY

[3] M2 (optical motor) control

24VDC 24VDC 24VDC

PGND PGND PGND

5VDC

5VDC SGND SGND

DCPS

SCDB

M2 (optical motor) is controlled by the SCDB (scanner drive board). A related signal is provided by PS14 (optics home position PS).

1. Operation

a. Operation of M2

M2 is a 3 phase stepping motor running on 24VDC. This motor drives the exposure unit so as to implement scanning. Forward rotation, reverse rotation, and rotation speed are switched as necessary to carry out each scan cycle.

The exposure unit's home position is detected by PS14. M2 operation (drive time span and drive direction) is controlled by time count after PS14 ON or PS14 OFF.

b. Exposure unit’s scan speed

Scan Speed

Forward <Other than 7035>

140mm/sec (1:1 magnification)

<7035> 80mm/sec (1:1 magnification)

Reverse <Other than 7035>

241mm/sec (max) <7035>

310mm/sec (max)

c. Initial operation when power is turned ON

When SW2 (sub power switch) comes ON, the exposure unit starts a home position search. The search procedure differs according to whether PS14 is ON or OFF. Upon completing the search, the exposure unit stands by at the platen mode's APS reading position.

SGND

OPT_HOME

5VDC

U V

PS14

(1) When PS14 is turned ON

<7020/25/30>

Shading correction reading

Reference point

Shading correction reading

Reference point

PS14

Platen APS reading position

(2) When PS14 is goes OFF

<7020/25/30>

Shading correction reading

Reference point

Shading correction reading

Reference point

PS14

Platen APS reading position

d. Shading correction reading

Shading correction read out is implemented using the white reference plate attached beneath the glass stopper plate. Shading correction is executed when SW2 comes ON. In the case of the 7035, shading correction is performed when SW2 is turned ON, and also during each scanning job.

e. Exposure scanning modes

Two modes are implemented: platen mode and DF mode.

In platen mode, the exposure unit moves as necessary to scan the original. In DF mode, the RADF side moves the original while the exposure unit stays fixed in a specified position (the DF reading position).

REVISED EDITION

DATE

PA GE

METHOD

2-C-2

Jan. 2002

2-C-2

REPLACEMENT

READ SECTION

f. Operation in DF mode

The read position in the DF mode is on the paper exit side

of PS14, and the exposure unit moves from the standby position (platen APS read position) to the DF read position. In the case of the 7035, shading correction takes place while the exposure unit is moving to the DF read position.

It then returns to the platen APS reading position after completing the original scan and again enters standby.

DF reading position

Reference point

<7035>

DF reading position

Shading correction reading

Reference point

Platen APS reading position

PS14

Platen APS reading position

PS14

(1) AE mode

Reference point

<7035>

Reference point

Shading correction reading

(2) Manual copy mode

PS14

1 OUTLINE

AE scan

Exposure scan

Platen APS reading position

2 UNIT EXPLANATION

AE scan

Exposure scan

Platen APS reading position

3 DIS./ASSEMBLY

g. Operation in platen mode

In this mode, the scan sequence depends on the copy density selection (either AE or manual).

When the start button is pressed

When the AE mode is selected, the AE scan takes

place. When the AE mode is not selected, an exposure scan takes place immediately. In the case of the 7035, shading correction is performed before the commencement of scanning, for all operations. After completing the scan, exposure unit turns to the platen APS reading position.

Reference point

<7035>

Reference point

PS14

Exposure scan

Platen APS reading position

PS14

Exposure scan

Platen APS reading position

Shading correction reading

REVISED EDITION

DATE

Jan. 2002

2-C-3

PA GE

2-C-3

METHOD

REPLACEMENT

READ SECTION

1 OUTLINE

3 3

PS14

2 UNIT EXPLANATION

Reference point

<7035>

PS14

AE scan

Exposure scan (Latter half)

Exposure scan (First half)

Platen APS reading position

AE scan

Exposure scan (Latter half)

Exposure scan (First half)

3 DIS./ASSEMBLY

Platen APS

Reference point

Shading correction reading

reading position

(4) Dual page (Manual mode, Left binding) mode(3) Dual page (AE mode, Left binding) mode

Reference point

<7035>

Reference point

PS14

Exposure scan (Latter half)

Exposure scan (First half)

Platen APS reading position

PS14

Exposure scan (Latter half)

Exposure scan (First half)

Platen APS reading position

Shading correction reading

REVISED EDITION

DATE

Jan. 2002

2-C-4

PA GE

2-C-3-1

METHOD

REPLACEMENT

READ SECTION

2. Signals

1 OUTLINE

a. Input signal

[4] Exposure control

(1) OPT_HOME (PS14 → SCDB)

Exposure unit's home position detect signal.

[L]: Exposure unit is in home position.

[H]: Exposure unit out of home position.

b. Output signal

(1) M2 U, V, W (SCDB → M2)

2 UNIT EXPLANATION

M2 (Optical motor) ON/OFF drive signals.

24V

3 DIS./ASSEMBLY

24VDC 24VDC 24VDC PGND PGND PGND 5VDC 5VDC SGND SGND

DCPS

L1 EM PGND

LAMP_ON/OFF

24VDC

SCDB

INV1 L1INVB

Power for L1 (exposure lamp) is supplied by INV1 (exposure lamp inverter). This action is controlled by the SCDB (scanner drive board).

1. Operation

L1 is a xenon lamp, and is driven by an inverter circuit. Since the xenon lamp provides a stable light intensity with low heat generation, it does not require light intensity control circuit or overheat protection circuit.

2. Signals

a. Input signal

(1) L1 EM (INV1 → SCDB)

1NV1 error detect signal Enabled only when LAMP_ON/OFF is ON [L].

[L]: L1 ON

[H]: L1 OFF

* L1 EM is always High when LAMP_ON/OFF is OFF [H].

b. Output signal

(1) LAMP_ON/OFF (SCDB → INV1)

L1 ON/OFF control signal.

[L]: L1 ON

[H]: L1 OFF

REVISED EDITION

DATE

PA GE

METHOD

2-C-6

Feb. 2001

2-C-4

REPLACEMENT

READ SECTION

[5] Original reading control

5VDC

5VDC SGND SGND

12VDC

SGND

-12VDC SGND

DCPS

12VDC

SGND YCK 1 SGND RCK SGND YG SGND CLAMP SGND SCK SIN SLD MD0 MD1 MD2 SGND OD0 OD1 OD2 OD3 SGND OD4 OD5 OD6 OD7 SGND ED0 ED1 ED2 ED3 SGND ED4 ED5 ED6 ED7 APR 12VDC 12VDC 12VDC 12VDC SGND 5VDC 5VDC 5VDC 5VDC SGND

-5VDC

ADB

CCD

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 analog electrical signal corresponding to the light intensity. The ADB (A/D conversion board) then converts this signal into a digital signal.

a. Original reading

The reading timing is as follows.

(1) Platen mode

Reading starts at a predetermined time interval after the START button is pressed and when the exposure unit has moved 6mm in the paper feed direction after PS14 (optics home position) goes OFF.

(2) DF mode

When the leading edge of the original turns ON

PS311 (original registration PS) then moves a further

24.1 mm.

1 OUTLINE

2 UNIT EXPLANATION

3 DIS./ASSEMBLY

Original reading is carried out by the CCD sensor on the ADB (A/D conversion board).

REVISED EDITION

DATE

May 2000

2-C-7

PA GE

2-C-5

METHOD

REPLACEMENT

READ SECTION

1 OUTLINE

2 UNIT EXPLANATION

3 DIS./ASSEMBLY

[6] APS control

5VDC

5VDC SGND SGND

12VDC

SGND

-12VDC SGND

DCPS

12VDC

5VDC

5VDC SGND SGND

OPT_HOME

TIMING 1

APS_DATA 1

APS_DATA 2

SCDB

SGND

5VDC

SGND

5VDC

SGND

5VDC

SGND

5VDC

APS detection is carried out at opening or closing of the RADF cover or original cover, and is controlled by the SCDB (scanner drive board) based on signals from the APS sensors and CCD sensor. Related signals are provided by PS14 (optics home position PS), PS15 (APS timing PS) and by PS304 (DF open/close PS) on the RADF.

CCD

ADB

PS14

PS15

PS17

7020/25/30/35

PS18

L1 is ON during APS detection, so that the illumination level (light or dark level) in the main scanning differs according to whether the original is present or absent. To detect line width (main scanning width), the CCD sensor detects the difference from sky shot black level to paper edge white level at each side. If the RADF is installed, original size detection in the main scanning is reexecuted when PS304 (DF open/ close PS) comes ON, so as to confirm the original size.

The two APS sensors (PS17 and PS18) each consist of a photosensor and a LED. If the original is present at the sensor position, the light generated by the LED reflects from the original and is detected by the photosensor

<7020/25/30/35>

Exit side

PS17 PS18

1. Operation

a. APS detect operation

APS detection operation differs according to whether operation is in platen mode or DF mode.

(1) Platen mode

Caution : In the case of machines other than

Size is detected by the combination of the ON/OFF action of PS17 and PS18 (APS sensor 2) and the detect signal from the CCD sensor on the ADB (A/D conversion board).

PS17 and PS18 detect the original size in the sub scanning direction, while the CCD sensor detects the size in the main scanning direction.

7020/25/30/35, the PS17 (APS sensor 1) is not installed.

Exit side

PS18

: Photosensor : LED

(2) DF mode

Original size detection is carried out by ON/OFF action of PS306 (original size detect PS 1), and PS307 (original size detect PS 2), and by the resistance level of VR301 (original size detect VR) located in the RADF paper feed tray.

REVISED EDITION

DATE

Jan. 2002

2-C-8

PAG E

2-C-6

METHOD

REPLACEMENT

READ SECTION

The following table shows the relation between the PS sensors and detected original sizes.

Sensor

Original Size

11 × 17

8.5 × 14

F4(8.5 × 13R)

8.5 × 11R

A4R

8.5 × 11

B5R

A5R

B6R

PS17

PS306

OFF

PS18

PS307

OFF

ON : Original detected

OFF : Original not detected

2. Signals

a. Input signals

(1) TIMING1 (PS15 → SCDB)

RADF cover or platen cover open/close detect signal.

[L]: ON (Execute APS)

[H]: OFF (Cancel APS)

(2) APS_DATA1 (PS17 → SCDB)

(7020/25/30/35 only)

Original size detect signal.

[L]: Original detected.

[H]: Original not detected.

(3) ASP_DATA2 (PS18 → SCDB)

Original size detect signal.

[L]: Original detected.

[H]: Original not detected.

1 OUTLINE

2 UNIT EXPLANATION

3 DIS./ASSEMBLY

Caution : In the case of machines other than the

7020/25/30/35, read PS17 in the above table as PS18. Also, note that the ON/ OFF operation due to PS18 in the table does not take place.

b. APS detection timing

APS detection timing differs according to whether operation is in platen mode or DF mode.

(1) Platen mode

Detection is carried out when PS15 (APS timing PS) comes ON.

• If the RADF is installed, detection is carried out again when PS304 (DF open/close PS) comes ON.

• If the platen cover or RADF is open, detection is carried out when the START button comes ON.

(2) DF mode

If DF mode has been selected or if an original is set in the RADF paper feed tray, detection is carried out using PS306 (original size detect PS 1), PS307 (original size detect PS 2), and VR301 (original size detect VR).

REVISED EDITION

DATE

Jan. 2002

2-C-9

PA GE

2-C-7

METHOD

REPLACEMENT

READ SECTION

1 OUTLINE

2 UNIT EXPLANATION

3 DIS./ASSEMBLY

[7] AE control

SGND YCK 1 SGND RCK SGND YG SGND CLAMP SGND SCK SIN SLD MD0 MD1 MD2 SGND OD0 OD1 OD2 OD3 SGND OD4 OD5 OD6

CCD

OD7 SGND ED0 ED1 ED2 ED3 SGND ED4 ED5 ED6 ED7 APR 12VDC 12VDC 12VDC 12VDC

SGND 5VDC 5VDC

SGND SGND

12VDC

SGND

-12VDC SGND

DCPS

12VDC

During AE scan, the CCD sensor on the ADB (A/D conversion board) reads the density level of the original. The CPU on the CB (overall control board) processes the data and, based on the results, selects the gamma correction curve that will best reproduce the original.

5VDC 5VDC 5VDC 5VDC SGND

-5VDC

ADB

1. Operation

a. AE detect operation

(1) Platen copy

AE scanning is carried out when the START button is pressed. The operation measures density over the range described below.

1) If the platen cover or RADF cover is open, sampling is carried out to the boundaries of the non image area erase or within the area detected by APS.

2) If the platen cover or RADF cover is closed, scanning is carried out over the range from the center to 20mm away from each edge of the original, as detected by APS.

• If APS is unable to detect the size, sampling is carried out up to 20mm short of the minimum supported original size in each direction.

(2) DF mode (1-1)

Pressing the START button causes the original to feed. The leading area of the original is read, and density is measured based on the read data. The sampling range is as follows.

1) In the main scanning direction

Sampling is carried out to the boundaries of the non image area erase or within the area detected by APS.

• Sampling is carried out over the range from the center to 20mm away from each edge of the original, as detected by APS.

• If APS is unable to detect the size, scanning is carried out up to 20mm short of the minimum suppoted original size in each direction.

2) In the sub scanning direction

Sampling starts 1.5mm from the leading edge and ends 2.9mm from the leading edge.

2-C-8

WRITE UNIT

[1] Composition

WRITE UNIT

1 OUTLINE

Collimater lens unit

LD drive board (LDB)

Polygon motor

Cylindrical lens 1

fθ lens

Index mirror

Cylindrical lens 2

Index lens

Index sensor board (INDEX)

Dust-proof glass

2 UNIT EXPLANATION

3 DIS./ASSEMBLY

[2] Mechanisms

Mechanism Method

Scan *

Light source Laser diode

• Output: Max. 5mW

• Wavelength: 780nm

Positioning Index sensor

* : Path of laser light

The light output from semiconductor laser is radiated onto the opc drum via the collimater lens, cylindrical lens 1, polygon mirror, fθ lens, cylindrical lens 2.

Polygon mirror

Rotational speed

Other than 7035 : 33070.9 rpm

7035 : 42519.6 rpm

Index mirror

LD drive board (LDB)

Collimater lens unit

fθ lens

Dust-proof glass

Polygon mirror

Cylindrical lens 1

Cylindrical lens 2

Dust-proof glassPolygon mirror

Cylindrical lens 2

Index lens

Index sensor board

fθ lens

OPC drum

REVISED EDITION

DATE

Jan. 2002

2-D-1

PA GE

2-D-1

METHOD

REPLACEMENT

WRITE UNIT

1 OUTLINE

2 UNIT EXPLANATION

3 DIS./ASSEMBLY

[3] M5 (polygon motor) control

POLY LOCK

POLY CLK

POLY CONT

PGND

24VDC

DCPS

M5 (polygon motor) is controlled by the PRDB (printer drive board).

24VDC

PRDB

1. Operation

a. M5 is a brushless motor running on 24V DC

power. The motor turns the polygon mirror,

causing the laser beam from the LDB (LD drive

board) to scan along the drum shaft direction.

M5 includes an internal speed sensor, and uti-

lizes PLL control to maintain a constant speed.

2. Signals

a. Input signal

(1) POLY LOCK (M5 → PRDB)

M5 status detect signal.

[L] when M5 rotation reaches the rated speed.

b. Output signals

(1) POLY CONT (PRDB → M5)

M5 drive control signal.

[L]: M5 ON

[H]: M5 OFF

(2) POLY CLK (PRDB → M5)

Reference clock for M5 rotation control.

b. M5 rotation speed is as follows.

Machine State Rotation Speed

Copying

Idling Any of the following three

* If one of these speeds has been selected, M5

rotation speed will change at a specified time upon completion of warm up or completion of copy processing. You can select this time period, using "25" mode, to any of the following: 15 sec, 30 sec. 60 sec, 120 sec.

33070.9 rpm (Other than 7035)

42519.6 rpm (7035)

speeds can be selected by

using "25" mode.

Other than 7035

33070.9 rpm

16000 rpm*

42519.6 rpm

25000 rpm*

Stop*

7035

REVISED EDITION

DATE

Jan. 2002

2-D-PB

PA GE

2-D-2

METHOD

REPLACEMENT

WRITE UNIT

[4] Image write control

5VDC

CCD

ADB

5VDC

5VDC SGND SGND

12VDC

SGND SGND

12VDC

DCPS

The CCD sensor outputs analog image data. The ADB (A/ D conversion board) converts this data to digital form. The CB (overall control board) processes this data within memory, generating a laser recording signal. This signal is transmitted, by means of a CB control signal, to the LDB (LD drive board), and is output as an optical signal by the LDB's laser emitting element. The write start position for the laser recording signal is detected by the index sensor on the index sensor board.

SGND

/ENB

/VIDEO

SGND

/ALM

DACLK

LDPR+5VDC

5VDC

SGND

INDPR+5VDC

/S/H

/IND

LDB

INDEX

(3) Shading correction

White correction / Black correct

• At SW2 (sub power switch) ON

(4) Brightness/density conversion

(5) AE processing

(6) Text/dot pattern judgment

(7) Filtering

(8) Magnification change processing

(9) Error diffusion processing

(10) Data compression processing

(11) Write density correction

b. Write

CB transmits image data one pixel by one pixel to the LDB. The LDB emits the laser onto the drum in certain time for each pixel determined by the image data received from the CB.

(1) MPC (Maximum Power Control)

The CB informs LDB of the maximum laser output value. The LDB keeps and uses this value in APC (automatic power control) to maintain the laser intensity.

1 OUTLINE

2 UNIT EXPLANATION

3 DIS./ASSEMBLY

1. Operation

a. Image processing

The CB carries out the following processing.

(1) AOC (automatic offset correction)

Reading is taken with SW2 (sub power switch) ON and L1 (exposure lamp) OFF, and the analog offset voltage for CCD sencer output is automatically adjusted such that this level become the lower limit for the A/D converter (In the case of the other than

7035). In the case of the 7035, IC on ADB automatically adjusts analog off set voltage of CCD sensor output.

(2) AGC (automatic gain correction)

When SW2 comes ON, the level from the white reference board is read by turning ON the L1 (exposure lamp), and the analog amplification for the CCD sensor output is automatically adjusted such that this level becomes the upper limit for the A/D converter.

(1) After SW2 is set at ON when L detection

adjustment has been completed or the drum counter has been reset.

(2) When SW is turn ON first thing in the morning.

(3) Every 20th copy during a continuous copy

operation.

(2) APC (Automatic Power Control)

After the CB has set the MPC, it outputs an APC start command to the LDB in accordance with the following timing.

At detection of M5 (polygon motor) PLL lock. Thereafter, LDB automatically monitors the laser drive current for each line, and controls the laser such that the light intensity is always at MPC.

(3) Write timing

The index board's /IND signal determines the start time for laser writing of each scan in the drum shaft direction.

REVISED EDITION

DATE

Feb. 2001

2-D-3

PA GE

2-D-3

METHOD

REPLACEMENT

+ 35 hidden pages