Panasonic FP-7818, FP-7830, FP-7845, FP-7850, FA-S620 Service Manual

...

ORDER NO. OED9909380B8

FP-7818/7824/7830/7835/7845/7850 Service Manual

Service Manual

Parts Manual

Plain Paper Copier

FP-7818/7824/7830 FP-7835/7845/7850

Staple Sorter

FA-S620/660

System Console

FA-DS72/82

WARNING

This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair the product or products dealt with in this service information by anyone else could result serious injury or death.

For U.S.A

This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment on a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his/her own expense.

Any unauthorized changes or modifications to this equipment would void the users authority to operate this device.

For U.S.A

This manual was developed and is supplied to authorized servicing dealers by Panasonic Document Imaging Co. for the sole purpose of providing information necessary for the equipment’s proper support. It is intended that this information be confidential and may not reproduced without prior written consent from Panasonic Document imaging Co. Panasonic Document imaging Co. reserves the right to change any information enclosed herein without prior notification.

This manual was developed and is supplied to authorized servicing dealers by Panasonic Co. for the sole purpose of providing information necessary for the equipment’s proper support. It is intended that this information be confidential and may not be reproduced without prior written consent from Panasonic Co. Panasonic Co. reserves the right to change any information enclosed herein without prior notification.

This manual dose not contain descriptions of PCB Connector and Signal Information and Sub Assemblies Operation which are discribed and unchanged in the FP-7718/7722/7728/7735/7742/7750 service manual. For those items not covered in this manual, please refer to the FP-7718/7722/7728/7735/7742/7750 service manual or PCB repaire manual.

Contents / Index

I. Introduction

1.1 Specification ..................................................................................... 1-1

1.2 Features............................................................................................ 1-3

1.3 System Configuration ....................................................................... 1-4

1.4 Operation .......................................................................................... 1-6

(1) Special Effects Panel (FP-7818/7824/7830/7835) ...................... 1-7

(2) Communications Monitor (FP-7818/7824/7830/7835) ................ 1-8

1.5 Component Location......................................................................... 1-9

(1) Inner view.................................................................................. 1-10

(2) Fan/Motor Location ................................................................... 1-11

(3) Sensor Location ........................................................................ 1-12

(4) Solenoid/Clutch/Discharge lamp Location ................................ 1-13

(5) PCB Location ............................................................................ 1-13

1.6 Copy Process ................................................................................. 1-14

1.7 Precautions on Set Up.................................................................... 1-15

1.8 Precautions with Consumables ...................................................... 1-16

II. New Function

2.1 Image Control

Qualitative Reasoning Based Adaptive Controller .........

2-1

2.2 Toner Density Control....................................................................... 2-3

2.3 Trouble Avoidance Mechanism ........................................................ 2-5

2.4 Toner Recycling System................................................................... 2-7

2.5 Re-try Control for Paper Misfeed ...................................................... 2-8

III. Sub Assemblies

3.1 Main Drive......................................................................................... 3-1

(1) Detecting sheet bypass paper size ............................................. 3-2

(2) Developing .................................................................................. 3-3

(3) Supplying toner ........................................................................... 3-4

(4) Toner level detection................................................................... 3-5

(5) Temperature control.................................................................... 3-6

(6) Automatic detection of original paper size .................................. 3-7

(7) Adjusting quantity of light of AE sensor ...................................... 3-7

Introduction

Control

Functions

Sub Assemblies

Preventive

Maintenance

Troubleshooting

Unpacking/

Installation

IV. Preventive Maintenance

4.1 Precautions for Periodic Maintenance Service ................................. 4-1

4.2 Maintenance chart ............................................................................ 4-2

4.3 Cleaning Method............................................................................... 4-4

4.4 Disassembly and Re-assembly ........................................................ 4-7

(1) Multi-feed bypass ........................................................................ 4-8

(2) Paper feed unit.......................................................................... 4-11

(3) Developer unit ........................................................................... 4-14

(4) Fuser unit .................................................................................. 4-19

(5) Optics unit ................................................................................. 4-24

(6) Automatic duplex unit (ADU ).................................................... 4-32

(7) Main Body ................................................................................. 4-35

V. Troubleshooting

5.1 Service Mode.................................................................................... 5-1

(1) Service mode functions............................................................... 5-1

(2) Service mode procedure ............................................................. 5-2

(3) F4 mode ...................................................................................... 5-4

(4) F5 mode Copier function programming..................................... 5-16

(5) F6 mode Adjustment and programming.................................... 5-23

(6) F7 mode electronic counter....................................................... 5-29

(7) F8 mode copier operation adjustment ...................................... 5-31

(8) F9 Telephone# input ................................................................. 5-33

5.2 Self-diagnostics/Machine Malfunctions........................................... 5-34

(1) User error .................................................................................. 5-34

(2) Paper Jam................................................................................. 5-40

(3) Machine error ............................................................................ 5-43

5.3 User Preset Mode........................................................................... 5-58

VI. Unpacking/Installation

6. 1 Installation Requirements ............................................................... 6-1

6.2 Contents Check ............................................................................... 6-1

6.3 Unpacking........................................................................................ 6-1

6.4 Installation Procedure ...................................................................... 6-2

6.5 Adjustment....................................................................................... 6-7

6.6 White Density Adjustment.............................................................. 6-10

Caution:

Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommended by the manufacturer. Dispose of used batteries according to the manufacture's instructions.

For Sweden, and Denmark

SPECIALSÄKRING: ENDAST AV APPARATFABRINKANTEN LEVERERAD

SÄKRING FåR ANVÄNDAS.

VARNING!

Explosionsfara vid felaktigt batteribyte. Använd samma batterityp eller ekvivalent typ som rekommenderas av apparattillverkaren. Kassera använt batteri enligt fabrikantens instruktion.

ADVARSEL!

Lithiumbatteri—Eksplosionsfare ved fejlagtig håndtering. Udskiftning må kun ske med batteri af samme fabrikat og type. Lever det brugte batteri tilbage til leverrandoren.

CAUTION!

Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent recommended by the manufacturer. Dispose of used batteries according to the manufacturer’s instructions.

For Holland

Batterij niet

weggooien, maar

inleveren als KCA.

For U.K.

FOR YOUR SAFETY PLEASE READ THE FOLLOWING TEXT CAREFULLY. This appliance is supplied with a moulded three pin mains plug for your safety and convenience. A 13 amp fuse is fitted in this plug. Should the fuse need to be replaced please ensure that the replacement fuse has a rating of 13 amps and that it is approved by ASTA or BSI to BS1362. Check for the ASTA mark or the BSI mark on the body of the fuse.

If the plug contains a removable fuse cover you must ensure that it is refitted when the fuse is replaced. If you lose the fuse cover the plug must not be used until a replacement cover is obtained. A replacement fuse cover can be purchased from your local Panasonic Dealer.

IF THE FITTED MOULDED PLUG IS UNSUITABLE FOR THE SOCKET OUTLET IN YOUR OFFICE THEN THE FUSE SHOULD BE REMOVED AND THE PLUG CUT OFF AND DISPOSED OF SAFELY. THERE IS A DANGER OF SEVERE ELECTRICAL SHOCK IF THE CUT OFF PLUG IS INSERTED INTO ANY 13 AMP SOCKET. If a new plug is to be fitted please observe the wiring code as shown below. If in any doubt please consult a qualified electrician.

WARNING: THIS APPLIANCE MUST BE EARTHED. IMPORTANT: The wires in this mains lead are coloured in accordance with the following

code: Green and Yellow :Earth Blue :Neutral Brown :Live

As the colours of the wires in the main lead of this appliance may not correspond with the coloured markings identifying the terminals in your plug, proceed as follows: The wire which is coloured GREEN-AND-YELLOW must be connected to the terminal in the plug which is marked by letter E or by the safety EARTH symbol “ ” or coloured GREEN or GREEN-AND-YELLOW. The wire which is coloured BLUE must be connected to the terminal in the plug which is marked with the letter N or coloured BLACK. The wire which is coloured BROWN must be connected to the terminal in the plug which is marked with the letter L or coloured RED.

How to replace the fuse. Open the fuse compartment with a screwdriver and replace the fuse.

Fuse

iii

1-1

Introduction

Section I Introduction

1. 1 Specifications

1.Type Desk Top

2.Copy process Electrostatic photographic method

3.Development process Two component magnetic brush

4.Maximum original size Ledger(11"x17") / A3(297 x 420mm)

5.Copy speed

FP-7818 FP-7824 FP-7830 FP-7835 FP-7845 FP-7850

(cpm)

Ledger/A3 :

12.5 15.5/16.0 18.50/19.00 20/20.5

Legal/B4,FLS

14 17.5/17.0 21.00/20.50 23.5/23

Letter-R/A4R

15.5 19.5/19.0 24.00/23.50 28.5/27.5 43/41.5

Letter/A4 :

18 24.0 30.00 35 45 50

Invoice/A5 :

18 24.0 30.00 35 45 50

6.First copy time

FP-7818 FP-7824 FP-7830 FP-7835 FP-7845 FP-7850

(sec) letter/A4 size

4.8 4.0 4.0 4.0 2.9 2.9

without Auto mode letter/A4 size

6.2 5.1 5.1 5.1 3.6 3.6

with Auto mode

7.Copy ratio Enlargement(fixed) : 2.00, 1.73, 1.41, 1.22, 1.15 Reduction (fixed) : 0.87, 0.82, 0.71, 0.58, 0.50 Zoom : 50%-200% (1%step)

8.Copy size Ledger/A3–Invoice/A5

9.Paper capacity Cassette :

550 sheets x 2 (550 sheets:FP-7818)

Multi-feed bypass : 50 sheets

10.Paper feed Front loading universal paper cassette Multi-feed bypass tray

11.

Paper exit tray capacity

250 sheets

12.Paper weight Cassette : 16–24 lbs ( 60–90g/m

)

Bypass : 15–30 lbs (55–130g/m

)

13.Special paper OHP,Label paper, Tracing paper (Through multi-feed bypass)

14.Continuous copying 1-999 reset to 1 (1-99 reset to 1 : FP-7818)

1-2

15.Fusing system Heat and Pressure

16.Photoreceptor Organic Photo Conductor(OPC)

17.Exposure control 7 step digital+Photo/Auto button

18.Warm up time FP-7818 approx. 40 sec. FP-7824 approx. 50 sec. FP-7830 approx. 75 sec. FP-7835 approx. 75 sec. FP-7845 approx. 180 sec. FP-7850 approx. 270 sec.

19.Power consumption Less than 1.45 kW/1.5 kW

20.Power source AC120V 60Hz / AC220 - 240V 50Hz

21.Dimensions (W x D x H) 23.9" x 26.0" x 22.9" / 606 x 661 x 582 mm (23.9" x 26.0" x 18.1" / 606 x 661 x 479 mm : FP-7818)

22.Weight (PU) (PG) FP-7818 138.6 lbs / 64 kg FP-7824 149.6 lbs / 70 kg FP-7830 149.6 lbs / 70 kg FP-7835 149.6 lbs / 70 kg FP-7845 161 lbs / 73.5 kg FP-7850 161.5 lbs / 73.7 kg

23.Ambient conditions Temperature : 50–86F/10–30 °C Relative humidity : 30–80%

24.Optional accessories i-ADF FA-A888 ADF FA-A505 Sorter FA-S280

(10bin sorter: FP-7818/7824/7830) FA-S575/S660/S680 (20bin sorter: except FP-7818)

System console FA-DS72: FP-7818/7824/7830/7835

FA-DS82: FP-7845/7850

LCC FA-MA301

* Specifications are subject to change without notice.

1-3

Introduction

1. 2 Features

• Introducing Qualitative Reasoning Based Adaptive Controller copy density control

With Qualitative Reasoning Based Adaptive Controller used for copy density control, optimum copies are maintained for a long time in variable environmental conditions.

• User friendly operation

The touch panel enables simple operation. (FP-7845/7850)

• Enhancements in serviceability

If a problem should occur the self diagnosis system will indicate which area is responsible.

• Standard Automatic Duplexing (FP-7850)

An Automatic Duplex Unit is provided as standard, in addition to front paper loading (550 sheets) + Multiple sheet bypass (50 sheets).

• Functional expansion through optional accessories

Equipping with the system stand and LCC allows a high copy volume Maximum feed paper capacity

FP-7818 2,250 sheets : four drawers + multiple sheert bypass FP-7824 2,800 sheets : five drawers + multipler sheet bypass FP-7830/7835/7845

5,800 sheets : five drawers + LCC + multiple sheet bypass

FP-7850 5,250 sheets : four drawers + LCC + multiple sheet bypass ADF and sorter can be connected with the main system easily by using exterior connectors.

• Environmental considerations

Quieter operation, lower power consumption, a higher content of recyleable plastic and our new Qualitative Reasoning Based Adaptive Controller. (FP-7830/7835/ 7845/7850)

1-4

1. 3 System Configuration

i-ADFADF

Main Unit

ADU

550

Sorter

Paper drawer

550

System console

550

Cover

Storage

LCC

3000

Accessories FP-7818 FP-7824 FP-7830 FP-7835 FP-7845 FP-7850

FA-DS72

FA-DS82

xxxx

LCC ( FA-MA301 )

Number of drawer 1 2 2 2

1 + ADU 1 + ADU

Auto Duplex unit (FA-MADM6)

Option Option Option

Standard Standard

ADF FA-A505 i-ADF FA-A888

10bin sorter FA-S280

xxx

20bin sorter FA-S575

20bin staple sorter

FA-S660/S680

ADF

Copier

paper feed

System

console

Sorter

Key: = OKx = N/A

System Console FA-DS72: Storage tray,Cover x 1

( 2 drawers drive mechanism ) FA-DS82: 550 sheets paper drawer, Storage tray, Cover ( 3 drawers drive mechanism )

1-5

Introduction

Department counter 50 50 100 100 300 300 Cover, Interleaving, Presentation No * No * No * No * Yes Yes Job memory 2 2 2 2 5 5

This Service Manual is based on the FP-7850. To identify areas where the other models differ, please refer to this chart and the Field Service Manual for each model.

FP-7818 FP-7824 FP-7830 FP-7835 FP-7845 FP-7850

Warm up time ( sec.) 40 50 70 70 180 210

First copy time ( sec.) 4.8 4.0 4.0 4.0 2.9 2.9

Paper feed cassette 1 2 2 2

1+ADU 1+ADU

System stand DS72 DS72 DS72 DS72 DS82 DS82

Copy speed 18 22 28 35 42 50 Control panel design LED LED

LCD display LCD display LCD touch panel LCD touch panel

Transfer corona cleaner No No No No Yes Yes Drum separation finger No No No No Yes Yes Fuser lamp 1 1 1 1 2 2 Process speed ( mm/sec. ) 170 210 210 210 340 340 Developer suction No No No No Yes Yes Fresh toner recycling No No Yes Yes Yes Yes Toner bottle life 10K 10K 20K 20K 20K 20K Waste toner bottle capacity 10K 10K 120K 120K 120K 120K PM cycle 80K 80K 120K 120K 120K 120K

[ Comparison of specifications ]

* Except OHP Interleaving

1-6

21 5

3 6

4 7

1. 4 Operation

Energy Saver

Interrupt Key

User Preset Key

Touch Panel Display Manual Key

Clear/Stop Key

Press to stop copy run or clear copy count in display.

Print Key

Reset Key

Press to reset all features to initial power-on state.

Original Size Keys

Multi Size Key

Job Memory Key Copy Size Keys

Quantity Keys

Ready Indicator

Ready: Green LED Not ready: Red LED Copy Reservation: Flashing

• FP-7845/7850

LEDGER

LEGAL

LETTER

INVOICE

1 2 3 4 5 6 7 8 9 0

Print Key

Recall Key

To recall the number of copies selected during a copy run.

Quantity Keys

Communications Monitor

Copy Size Keys

Original Size Keys

Special Effects Panel

• FP-7818/7824/7830/7835

Energy Saverkey

Interrupt Key

Reset Key

Clear/Stop Key

1-7

Introduction

No. Keys

8 Edge Mode 9 Book Mode

Memory In/Job programs

Duplexing mode selection (Except FP-7818/7824)

• Using ADU

2:1 Copy (Except FP-7818/7824)

• Using i-ADF

2-Page copy/2 in 1 mode selection (2 in 1 : Except FP-7818/7824)

No. Keys

1 Multi-Size Feeding

(Except FP-7818/7824)

• Using i-ADF

2 Original Count

(Except FP-7818/7824)

• Using i-ADF and ADU 2 in 1 mode

3 Access 4 User Preset 5 OHP interleaving mode 6 Zoom 7 Margin Shift Mode

(1) Special Effects Panel (FP-7818/7824/7830/7835)

1 2

M1 M2

OHPOHP

1 2 3

7 8

1011

321

1-8

FP-7818/7824

FP-7830/7835

LEDGER LEGAL LETTER LETTER INVOICE

FP-7718

STAPLE

SORT

STACK

STAPLE

SORT

STACK

1 12 3 4 5 6 7

9 81710111812

(2) Communications Monitor (FP-7818/7824/7830/7835)

No. Indicator

1 Adding

Paper Toner Staple (Except FP-7818)

Replacing

Waste Toner Bottle

2 Reduction 3 Enlargement

4 Service Call

• Flashes for routine maintenance.

• Lights steadily for duplex maintenance

5 Paper Misfeed 6 Copy Count Display

Indicates number of copies, zoom ratio and error code.

No. Indicator

7 Message Display

(FP-7830/7835) Indicates procedures, functions maintenance, etc.,

8 Exposure Indicator 9 Paper Size Indicator 10

Paper Drawer/Tray Indicator (–)

Paper misfeed location (•)

Mode Select Indicator

Staple Sort (Except FP-7818) Sort Group

No. Keys

Manual Key

PHOTO/AUTO

Exposure Control (DARK)

No. Keys

Exposure Control (LIGHT)

Paper Drawer/Tray

Mode Select Key

1-9

Introduction

1. 5 Component Location ( Outer view )

Control Panel

i-ADF

ADF

FP-7818

System console

Sorter

LCC (Except FP-7824)

Bypass

Sorter

FP-7824/7830/7835

LCD touch panel

Control panel

i-ADF

Right cover

Bypass Paper feed cover

LCC

FP-7845/7850

System console

Front panel

Sorter

1-10

(1) Inner view

1 Half-speed unit 2 Full-speed unit 3 Lens Position sensor 4 Thermistor 5 AE Sensor 6 Main motor 7 Lens unit 8 Charge corona 9 No.6 mirror 10 Slit glass 11 No.4 mirror 12 No.5 mirror 13 LED array 14 Magnetic roller 15 Registration roller 16 Bypass pick-up roller 17 Bypass paper feed roller 18 Bypass DFP roller 19 Middle roller

20 Paper feed roller 21 DFP roller 22 Pick-up roller 23 ADU Paper feed roller 24 Corona cleaner 25 Transfer/Separation corona 26 Drum 27 Transfer belt 28 Pressure roller 29 Fuser lamps 30 Fuser separation finger (lower) 31 Reverse roller 32 Fuser separation finger (upper) 33 Paper exit roller 34 Paper exit sensor 35 Heat roller 36 Cleaning Web roller 37 Full-speed unit home postion sensor

38 Drum separation finger

234567388 9 10 11 12

13 14

15 16

17 18

222324252627

1-11

Introduction

Mirror stepping motor

Optics drive motor

Lens stepping motor

Developer cooling fan

Toner bottle motor

Dust collecting fan

ADU paper length guide motor (FP-7850)

ADU paper width guide motor (FP-7850)

ADU drive motor (FP-7850)

Optics fan

Main motor

Optics fan

Exhaust fan

Lifting motor (lower stage)

Suction/Ozone fan

(2) Fan/Motor Location

1-12

(3)Sensor Location

Mirror home position

Exposure lamp home position

Platen cover open/close

Platen cover angle

AE (Automatic original density sensor)

Original size

ADU detection (FP-7850)

Toner density

Copy density

ADU paper length (FP-7850)

ADU paper pass 1 (FP-7850)

Paper exit

Lens home position

Front cover open/close

ADU paper width (FP-7850)

Paper level (lower stage)

ADU paper detection (FP-7850)

ADU paper pass 2 (FP-7850)

Registration roller paper pass

Paper detection (lower stage)

Bottom plate upper limit sensor (lower stage)

Middle roller paper pass (upper/lower stage)

Waste toner bottle

Total counter

Bypass paper detection

Bypass paper size

Toner level

Toner bottle home position

Paper feed cover open/close

1-13

Introduction

(4) Solenoid/Clutch/Discharge lamp Location

Paper feed clutch

Registration roller clutch

Discharge lamp

Middle roller clutch

Bypass pick-up solenoid

Paper feed clutch (lower stage)

Separation solenoid

Paper exit solenoid (FP-7850)

Power switch

Door switch

ADU clutch (FP-7850) Pick-up solenoid (lower stage)

Recycle solenoid

(5) PCB Location

HVPS (High voltage power supply)

LED array

Control panel 4

Control panel CPU

Control panel 3

Paper feed driver

LVPS (Low voltage power supply)

AC driver

Main CPU

Automatic duplex unit driver (FP-7850)

1-14

1. 6 Copy Process

Charger

Discharge lamp

Cleaning

Fusing

Exit

ADU

Paper feed

Separation

Transfer

Developer

Toner

Exposure

Original

Reduction Discharge

Trimming

–DC

Discharge lamp:

Transfer/Separation Fusing: Cleaning:

Primary Charge: Image Exposure: Developing:

Drum surface approximately-800V DC

Charge corona

Drum

Latent charge image

Illumination

Magnetic roller

Latent charge image(–)

Discharge lamp

Heat roller

Fuser lamp

Paper

Pressure roller

Latent image

Transfer corona

Cleaning blade

Drum

Blacking prevention

Toner (+)

Toner

Paper

Separation corona

1-15

Introduction

1. 7 Precautions on Set Up

Copy machine performance and the copy quality is subject to and dependant on environmental conditions. To maintain good performance, quality, and safe operation, observe the following precautions:

1) For safe operation and to avoid trouble do not install the system under the following conditions:

• High temperature, high humidity, low temperature or low humidity

• The temperature or humidity varies suddenly

• Being exposed to direct sunlight

• Dusty space

• Badly ventilated location

• Exposed to chemical gases (such as ammonia gas)

• Exposed to strong vibration

• Directly exposed to direct wind (ex. outlet of air conditioner)

2) The weight of machine is 220lb(100 kg) or more with options. It must be placed on a firm platform which is level.

3) The maximum power consumption is 1.45 kW. Use an independent power supply of 120 V and 15 A (220-240V and 7A)or higher. (Do not use a extension cord.)

4) Make sure the machine is properly grounded. (Do not ground to gas or water pipe.)

• A ground terminal is provided on the back of the copier main body.

5) Install the machine with enough space around it.

4"/100 mm

14"/350mm

28"/700mm

Copier

Multi sheet bypassExit tray

1-16

1. 8 Precautions with Consumables

(1) Photoreceptor drum

• Do not touch the surface (with the hand or anything else).

• Stand the drum with the drum gear up for storage.

• Be careful not to smear with saliva, water, oil and so on.

• Do not place a where the temperature is high.

• Do not place it in strong light (such as direct sunshine or at window).

• Do not expose it to chemical gas or vapor.

• Do not store the developer unit with the photo receptor drum installed without covering it with clean paper.

(2) Toner Developer

1) Do not mix different types of toner and developer.

• The machines are designed to use exclusive toner and developer for specific models. Do not mix with toner and developer for other models.

2) Do not mix foreign materials. Be careful not to include foreign materials in the toner and developer. If you spilled toner or developer on a table or floor when adding toner or developer in the developer unit, discard what was dropped. Such supplies may damage the drum as well as cause other trouble with the image.

3) Do not place into other containers. Toner and developer must not be placed into other containers, because some containers may change the characteristics of the supply. Vinyl chloride potentially changes the characteristics of supplies because of migrating plasticizers.

4) Precautions on storage and transport

• Toner and developer additives are sensitive to temperature (high temperature in particular) and humidity (high humidity in particular). Pay attention to the following items for storage and transport.

• Store them in a dark and cool location (lower than 95 F/35 C) and out of direct sunshine.

• Be careful not to expose them to rain or direct sunshine during transportation. When delivered by truck the temperature inside must be not higher than 104 F/40 C.(Under the sun in summer, the inside temperature can typically be 140 F/60 deg.C or higher in a closed vehicle compartment.)

1-17

Introduction

• There are normally no special problems with storage and transport in a cold climate but, store in a low humidity condition. Do not put supplies near heaters.

5) Safety and hygiene Toner has the property of easily being wind blown. Toner on skin does not cause any damage to health but, inhaling it is undesirable even if a powder is simply dust. Therefore, be careful not to inhale toner .

• Handle the toner gently when changing cartridges, and developer when pouring in the developer unit. If you have breathed in a lot of toner by mistake, rinse out your mouth with water completely. Any toner on the skin should be washed off with soapy water.

• Toner stuck on clothing must be removed in a dry condition (by a vacuum cleaner, brush, or beating,) and then washed with soapy water. Wiping off with benzine, alcohol, or thinner is not recommended because it may partially melt the components of toner even more, resulting in a harder stain and spot.

• Toner spilled must be cleaned with a vacuum cleaner, and then wiped with a cloth dampened with a neutral detergent and wrung out.

• If exposed to flames toner and developer will burn. Keep these supplies away from open flames.

• Any wasted consumables (photo receptor, developer and toner) should be recycled.

• Wear rubber gloves, eye protection and so on before handling any solvents such as IPA.

Control

Functions

2-1

Section II Control Functions

2. 1 Image Control Qualitative Reasoning Based Adaptive Controller

• Even if the toner density is at it's standard level, the copy image may vary with time depending on the characteristics of drum and the environmental variations. To prevent this change, the copy density sensor which is installed under the developer unit controls the image to stablize the copy image.

• Controlling the image During initialization after turning on the power, the copy density sensor reads the white density, medium density (line pattern density patch) and black density developed on the drum surface.These three values are compared with the ideal gamma curve stored in the copiers memory. The copier detects the amount offset from the standard gamma curve (such as "a little background" or "light image") and calculates the variables for copy density control in accordance with Qualitative Reasoning Based Adaptive Controller. In this way it finds the optimum compensation values to tighten the gamma curve for maintaining peak copy quality. By means of this process, copy quality is stabilized by the various compensations enabled by Qualitative Reasoning Based Adaptive Controller adjustment in image production.

• The control of the gamma curve stabilizes copy quality by monitoring three points of copy quality (white density, medium density and black density) and has a direct effect on background, solid area density and good reproduction of fine lines regardless of environmental changes and variation with time and copy volume.

2-2

• Qualitative Reasoning Based Adaptive Controller Qualitative Reasoning Based Adaptive Controller is adaptive control on the basis of quantative reasoning theory. While successively reasoning and learning the change of process characteristics regardless of environmental changes and the variations with time and the number of copies on the copier, the system reads the patch marks and determines the best values of exposure and surface potential to establish the best gamma curve for optimum copy quality.

• Qualitative Reasoning Based Adaptive Controller is applied at the following intervals. a) During initialization after turning on the power. b) After every 1,000 sheets following execution of Qualitative Reasoning Based

Adaptive Controller

(But, every 200 sheets following the execution of F8-09 for the next

500 sheets) c) After turning on the power (up to 200 copies) d) After replacing the toner bottle (up to 200 copies)

• Copy density detecting sensor Two sensors for detection of copy density are used, one for white density, and line pattern density and one for detection of black density. (Temperature and humidity sensors are not used.)

• To correct for toner build up on the sensor, clean the sensor at the same time as the replacement of the drum. The system provides a measured amount of light and detects the reflected light. The resultant value is used for sensor compensation. This becomes the reference value.

• As the reference value of the white density changes, various components are adjusted according to characteristics of the gamma curve.

Reference F5-25: Qualitative Reasoning Based Adaptive Controller

Operation ON/OFF

F mode F6-80: Automatic compensation value (read only)

F6-81: Automatic compensation value (read only) F6-82: Automatic compensation value (read only) F6-28: White density reference value

(set by Qualitative Reasoning Based Adaptive Controller)

F6-29: Black density reference value

(set by Qualitative Reasoning Based Adaptive Controller)

Control

Functions

2-3

Amount of carrier passing TDC sensor Toner density condition Sensor output voltage

Less High Lower than normal

Much Low Higher than normal

The following controls are necessary for normal control of toner density

1) Automatic adjustment of TDC sensor gain (during execution of F8-C09) (to attain the standard reference level).

2) Maintain the standard level by control of toner density during use.

1) Automatic adjustment of TDC sensor gain Automatically adjust the reference through the TDC sensor by executing service mode F8-09. The operation flow is as shown below.

2. 2 Toner Density Control

To keep toner density(toner carrier ratio) in the developer unit constant, the TDC sensor (toner density sensor) which is installed under the developer unit detects the amount of carrier in the developer unit to control the toner density.

The change in magnetic flux density in accordance with the amount of carrier (magnetic power) in the developer (mixture of toner and carrier) is detected by the TDC sensor and is converted to a voltage to control the toner density.

F8-09 start

CPU will check toner density sensor output. (2.5 V)

CPU will adjust sensor gain control signal

Memory number will be changed to new number in memory. (F6-21 or F6-26)

Toner density sensor output voltage will be adjusted to 2.5 V

Yes

2-4

2) Maintain standard toner density While checking the output voltage of the TDC sensor for every copy, control the timing of toner supply to the developer unit so that the output voltage is 2.5V at all times to keep the toner density constant.

Supply toner: supply from reserve tank for 6 seconds (amount of toner supply: approx. 1.4 g)

Rotate bottle for 7 seconds: supply toner to reserve tank. (Toner is not supplied to developer unit.)

Check TDC sensor output voltage at copying (or mixing).

Is the measured output voltage over 2.5V?

Do not supply toner.

Note) During bottle rotating, toner is not supplied.

YES

(Reference 1) Toner supply route

(Reference 2) Forced toner supply

Note: Bottle rotation means toner is being added to the reserve tank, not the

developer unit. This is not a final confirmation for proper TDC adjustment.

Reserve tank (hopper)

Developer unit

Bottle

Supply toner: supply for 4 seconds from reserve tank. (amount of toner supply: approx. 1.1 g)

Rotate bottle for 7 seconds: supply toner to reserve tank. (Toner is not supplied to developer unit.)

Perform twice.

Control

Functions

2-5

2. 3 Trouble Avoidance Mechanism

When some malfunction happens, this mechanism allows regular copy operation without error conditions (service man call) (providing the malfunction does not affect the basic copying operation and the appropriate function is not selected).

Appropriate function selected

Appropriate function not selected

The selected function is unavailable, Normal indication of copying repair is necessary, select others. "(EX-XX)"

EX-XX XXXXXX (Error code) (Electronic counter value at malfunction)

User mode

Service mode

Note: Only 30 records can be stored. Earliest records are

replaced by new ones as space is required.

+ 372 hidden pages

Panasonic FP-7818, FP-7830, FP-7845, FP-7850, FA-S620 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual