Text preview for : DC 1560_2050SM.pdf part of MITA DC-1560_2050SM MITA DC-1560_2050 servicemanual
Back to : DC 1560_2050SM.pdf | Home
DC-1560/2050
SERVICE MANUAL
Published in Oct. '99 841AF110
DC-1560/2050 (KME) S/M
DC-1560/2050
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 manufacturer's instructions.
CAUTION
Double-pole/neutral fusing.
SERVICE MANUAL
DC-1560/2050
Safety precautions
This booklet provides safety warnings and precautions for our service personnel to ensure the safety of their customers, their machines as well as themselves during maintenance activities. Service personnel are advised to read this booklet carefully to familiarize themselves with the warnings and precautions described here before engaging in maintenance activities.
Safety warnings and precautions
Various symbols are used to protect our service personnel and customers from physical danger and to prevent damage to their property. These symbols are described below:
DANGER:
High risk of serious bodily injury or death may result from insufficient attention to or incorrect compliance with warning messages using this symbol.
WARNING: Serious bodily injury or death may result from insufficient attention to or incorrect compliance with warning messages using this symbol. CAUTION: Bodily injury or damage to property may result from insufficient attention to or incorrect compliance with warning messages using this symbol.
Symbols The triangle ( ) symbol indicates a warning including danger and caution. The specific point of attention is shown inside the symbol. General warning.
Warning of risk of electric shock.
Warning of high temperature. indicates a prohibited action. The specific prohibition is shown inside the symbol. General prohibited action.
Disassembly prohibited.
indicates that action is required. The specific action required is shown inside the symbol. General action required.
Remove the power plug from the wall outlet.
Always ground the copier.
1. Installation Precautions
WARNING · Do not use a power supply with a voltage other than that specified. Avoid multiple connections to one outlet: they may cause fire or electric shock. When using an extension cable, always check that it is adequate for the rated current. ............................................................... · Connect the ground wire to a suitable grounding point. Not grounding the copier may cause fire or electric shock. Connecting the earth wire to an object not approved for the purpose may cause explosion or electric shock. Never connect the ground cable to any of the following: gas pipes, lightning rods, ground cables for telephone lines and water pipes or faucets not approved by the proper authorities. ........................
CAUTION · Do not place the copier on an infirm or angled surface: the copier may tip over, causing injury. ........................................................................... · Do not install the copier in a humid or dusty place. This may cause fire or electric shock. ..................................................................................... · Do not install the copier near a radiator, heater, other heat source or near flammable material. This may cause fire. ....................................... · Allow sufficient space around the copier to allow the ventilation grills to keep the machine as cool as possible. Insufficient ventilation may cause heat buildup and poor copying performance. ...............................
· Always handle the machine by the correct locations when moving it. .... · Always use anti-toppling and locking devices on copiers so equipped. Failure to do this may cause the copier to move unexpectedly or topple, leading to injury. .......................................................................... · Avoid inhaling toner or developer excessively. Protect the eyes. If toner or developer is accidentally ingested, drink a lot of water to dilute it in the stomach and obtain medical attention immediately. If it gets into the eyes, rinse immediately with copious amounts of water and obtain medical attention. .................................................................................... · Advice customers that they must always follow the safety warnings and precautions in the copier's instruction handbook. ...................................
2. Precautions for Maintenance
WARNING · Always remove the power plug from the wall outlet before starting machine disassembly. ............................................................................ · Always follow the procedures for maintenance described in the service manual and other related brochures. ...................................................... · Under no circumstances attempt to bypass or disable safety features including safety mechanisms and protective circuits. .............................
· Always use parts having the correct specifications. ............................... · Always use the thermostat or thermal fuse specified in the service manual or other related brochure when replacing them. Using a piece of wire, for example, could lead to fire or other serious accident. ........... · When the service manual or other serious brochure specifies a distance or gap for installation of a part, always use the correct scale and measure carefully. ........................................................................... · Always check that the copier is correctly connected to an outlet with a ground connection. .................................................................................
· Check that the power cable covering is free of damage. Check that the power plug is dust-free. If it is dirty, clean it to remove the risk of fire or electric shock. ......................................................................................... · Never attempt to disassemble the optical unit in machines using lasers. Leaking laser light may damage eyesight. .............................................. · Handle the charger sections with care. They are charged to high potentials and may cause electric shock if handled improperly. .............
CAUTION · Wear safe clothing. Avoid wearing loose clothing or accessories such as ties which may be caught in rotating sections. ................................... · Use utmost caution when working on a powered machine. Keep away from chains and belts. ............................................................................. · Handle the fixing section with care to avoid burns as it can be extremely hot. ......................................................................................... · Check that the fixing unit thermistor, heat and press rollers are clean. Dirt on them can cause abnormally high temperatures. ......................... · Do not remove the ozone filter, if any, from the copier except for routine replacement. ............................................................................... · Do not pull on the AC power cord or connector wires on high-voltage components when removing them; always hold the plug itself. .............. · Do not route the power cable where it may be stood on or trapped. If necessary, protect it with a cable cover or other appropriate item. ........ · Treat the ends of the wire carefully when installing a new charger wire to avoid electric leaks. ............................................................................
· Remove toner completely from electronic components. ......................... · Run wire harnesses carefully so that wires will not be trapped or damaged. ................................................................................................
· After maintenance, always check that all the parts, screws, connectors and wires that were removed, have been refitted correctly. Special attention should be paid to any forgotten connector, trapped wire and missing screws. ...................................................................................... · Check that all the caution labels that should be present on the machine according to the instruction handbook are clean and not peeling. Replace with new ones if necessary. ...................................................... · Handle greases and solvents with care by following the instructions below: ..................................................................................................... · Use only a small amount of solvent at a time, being careful not to spill. Wipe spills off completely. · Ventilate the room well while using grease or solvents. · Allow applied solvents to evaporate completely before refitting the covers or turning the main switch on. · Always wash hands afterwards. · Never dispose of toner or toner bottles in fire. Toner may cause sparks when exposed directly to fire in a furnace, etc. ......................... · Should smoke be seen coming from the copier, remove the power plug from the wall outlet immediately. ..................................................
3. Miscellaneous
WARNING · Never attempt to heat the drum or expose it to any organic solvents such as alcohol, other than the specified refiner; it may generate toxic gas. .........................................................................................................
1AF
CONTENTS
I THEORY AND CONSTRUCTION SECTION
1-1 Specifications 1-1-1 Specifications DC-2050 ................................................................. 1-1-2 Specifications DC-1560 ................................................................. 1-2 Handling Precautions 1-2-1 Drum ............................................................................................. 1-2-2 Developer and toner ...................................................................... 1-3 Mechanical Construction 1-3-1 Part names and their functions ..................................................... 1-3-2 Machine cross section ................................................................... 1-3-3 Drive system ................................................................................. 1-3-4 Mechanical construction ................................................................ 1-1-1 1-1-3 1-2-1 1-2-1 1-3-1 1-3-3 1-3-4 1-3-6
II ELECTRICAL SECTION
2-1 Electrical Parts Layout 2-1-1 Electrical parts layout .................................................................... 2-1-1 2-2 Detection of Paper Misfeed 2-2-1 Paper misfeed detection ............................................................... 2-2-1 2-2-2 Paper misfeed detection conditions .............................................. 2-2-2 2-3 Operation of the PCBs 2-3-1 Composite PCB ............................................................................. 2-3-1 2-3-2 Main PCB ...................................................................................... 2-3-3 2-3-3 Operation unit PCB ........................................................................ 2-3-8
III SET UP AND ADJUSTMENT SECTION
3-1 Installation 3-1-1 Unpacking and installation ............................................................ 3-1-1 3-1-2 Setting initial copy modes ........................................................... 3-1-16 3-1-3 Installing the key counter (option) ............................................... 3-1-17 3-1-4 Installing the dehumidifier (service part) ..................................... 3-1-19 3-2 Simulation 3-2-1 Simulations .................................................................................... 3-2-1 3-3 Assembly and Disassembly 3-3-1 Precautions for assembly and disassembly .................................. 3-3-1 3-3-2 Paper feed section ........................................................................ 3-3-3 3-3-3 Main charging section ................................................................. 3-3-17 3-3-4 Exposure section ......................................................................... 3-3-20 3-3-5 Drum section ............................................................................... 3-3-40 3-3-6 Developing section ...................................................................... 3-3-46 3-3-7 Transfer and separation section .................................................. 3-3-49 3-3-8 Cleaning section .......................................................................... 3-3-54 3-3-9 Fixing and eject section ............................................................... 3-3-57 3-3-10 Others ......................................................................................... 3-3-67 3-4 PCB Initial Settings 3-4-1 Replacing the main PCB ............................................................... 3-4-1 3-4-2 Adjustment-free variable resistors (VR) ........................................ 3-4-4
1-1-1
1AF 3-5 Self Diagnostics 3-5-1 Self-diagnostic function ................................................................. 3-5-1 3-6 Troubleshooting 3-6-1 Image formation problems ............................................................ 3-6-1 3-6-2 Paper misfeeds ........................................................................... 3-6-16 3-6-3 PCB terminal voltages ................................................................. 3-6-19 3-6-4 Electrical problems ...................................................................... 3-6-30 3-6-5 Mechanical problems .................................................................. 3-6-38 3-7 Appendixes Timing chart No. 1 ...................................................................................... 3-7-1 Timing chart No. 2 ...................................................................................... 3-7-2 Timing chart No. 3 ...................................................................................... 3-7-3 Composite PCB 1/3 .................................................................................... 3-7-4 Composite PCB 2/3 .................................................................................... 3-7-5 Composite PCB 3/3 .................................................................................... 3-7-6 Operation unit PCB ..................................................................................... 3-7-7 Main PCB ................................................................................................... 3-7-8 General connection diagram ...................................................................... 3-7-9 General wiring diagram ............................................................................ 3-7-10
1-1-2
1AF
CONTENTS 1-1 Specifications
1-1-1 Specifications DC-2050 ...................................................................... 1-1-1 1-1-2 Specifications DC-1560 ...................................................................... 1-1-3
1-1-5
1AF
CONTENTS 1-2 Handling Precautions
1-2-1 Drum ................................................................................................... 1-2-1 1-2-2 Developer and toner ........................................................................... 1-2-1
1-1-7
1AF
CONTENTS 1-3 Mechanical Construction
1-3-1 1-3-2 1-3-3 1-3-4 Part names and their functions ........................................................... 1-3-1 Machine cross section ........................................................................ 1-3-3 Drive system ....................................................................................... 1-3-4 Mechanical construction ..................................................................... 1-3-6 (1) Paper feed section ...................................................................... 1-3-6 (1-1) Paper feed from the paper drawer .................................... 1-3-8 (1-2) Paper feed from the bypass table ..................................... 1-3-9 (2) Main charging section ............................................................... 1-3-10 Surface potential correction control ........................................... 1-3-13 (3) Exposure section ....................................................................... 1-3-15 Exposure control for manual exposure and photo modes ......... 1-3-18 Exposure control for auto exposure mode ................................ 1-3-19 Light intensity correction for enlargement and reduction modes ........................................................................................ 1-3-20 Light intensity correction by the user setting ............................. 1-3-20 (4) Developing section .................................................................... 1-3-21 Formation of the magnetic brush ............................................... 1-3-23 Toner density control ................................................................. 1-3-25 Correcting toner sensor output voltage ..................................... 1-3-27 Toner level detection ................................................................. 1-3-30 (5) Transfer and separation section ................................................ 1-3-31 (6) Cleaning section ........................................................................ 1-3-34 (7) Charge erasing section ............................................................. 1-3-35 (8) Fixing and eject section ............................................................. 1-3-37 Heating the heat roller and detecting temperature .................... 1-3-39 Fixing temperature control ......................................................... 1-3-40 Paper separation ....................................................................... 1-3-42
1-1-9
1AF
CONTENTS 2-1 Electrical Parts Layout
2-1-1 Electrical parts layout .......................................................................... 2-1-1
1-1-11
1AF
CONTENTS 2-2 Detection of Paper Misfeed
2-2-1 Paper misfeed detection ..................................................................... 2-2-1 2-2-2 Paper misfeed detection conditions .................................................... 2-2-2
1-1-13
1AF
CONTENTS 2-3 Operation of the PCBs
2-3-1 Composite PCB .................................................................................. 2-3-1 2-3-2 Main PCB ............................................................................................ 2-3-3 (1) Fixing unit abnormally high temperature/shorted thermistor detection circuit .................................................................................................... 2-3-4 (2) Toner feed motor drive circuit .............................................................. 2-3-5 (3) Scanner motor drive circuit .................................................................. 2-3-6 (4) Reset circuit ......................................................................................... 2-3-7 2-3-3 Operation unit PCB .............................................................................. 2-3-8
1-1-15
1AF
CONTENTS 3-1 Installation
3-1-1 Unpacking and installation .................................................................. 3-1-1 (1) Installation environment .............................................................. 3-1-1 (2) Installation procedure .................................................................. 3-1-2 3-1-2 Setting initial copy modes ................................................................. 3-1-16 3-1-3 Installing the key counter (option) ..................................................... 3-1-17 3-1-4 Installing the dehumidifier (service part) ........................................... 3-1-19
1-1-17
1AF
CONTENTS 3-2 Simulation
3-2-1 Simulations ......................................................................................... (1) Running a simulation ................................................................... (2) Simulation list .............................................................................. (3) Contents of simulations ............................................................... 3-2-1 3-2-1 3-2-3 3-2-6
1-1-19
1AF
CONTENTS 3-3 Assembly and Disassembly
3-3-1 Precautions for assembly and disassembly ........................................ 3-3-1 (1) Precautions ................................................................................. 3-3-1 (2) Running a simulation ................................................................... 3-3-2 3-3-2 Paper feed section .............................................................................. 3-3-3 (1) Detaching and refitting paper feed pulleys A and B .................... 3-3-3 (2) Detaching and refitting the bypass lower pulley .......................... 3-3-5 (3) Detaching and refitting the bypass upper pulley ......................... 3-3-6 (4) Replacing the bypass paper width switch ................................... 3-3-7 (5) Adjusting the position of the original size indicator ...................... 3-3-9 (6) Adjusting the position of the drawer cover ................................ 3-3-10 (7) Adjusting the position of the bypass table adjuster ................... 3-3-11 (8) Adjustments after installing rollers and solenoids ..................... 3-3-12 (8-1) Adjusting leading edge registration timing ...................... 3-3-12 (8-2) Adjusting the leading edge margin ................................. 3-3-14 (8-3) Adjusting the trailing edge blank cut for 100% copy ....... 3-3-15 (8-4) Adjusting the trailing edge blank cut for reduction copy ................................................................ 3-3-16 3-3-3 Main charging section ....................................................................... 3-3-17 (1) Replacing the charger wire ........................................................ 3-3-17 3-3-4 Exposure section .............................................................................. 3-3-20 (1) Detaching and refitting the halogen lamp .................................. 3-3-20 (2) Detaching and refitting the optical section thermostat............... 3-3-21 (3) Adjusting the positions of the light adjusters ............................. 3-3-22 (4) Detaching and refitting the scanner wire ................................... 3-3-23 (4-1) Detaching the scanner wires .......................................... 3-3-23 (4-2) Installing the scanner wires ............................................ 3-3-24 (5) Adjusting focus (lens unit) ......................................................... 3-3-26 (6) Adjusting lateral image squareness (height of the mirrors 4 & 5 frame) ............................................................................... 3-3-27 (7) Adjusting longitudinal image squareness (height of mirror 2) ... 3-3-28 (8) Setting the exposure amount .................................................... 3-3-30 (8-1) Setting the manual-mode exposure amount .................. 3-3-30 (8-2) Setting the photo-mode exposure amount ..................... 3-3-33 (9) Adjusting the auto exposure (AE sensor) reference value ........ 3-3-34 (10) Adjusting lateral magnification (correcting the lens position) .... 3-3-35 (11) Adjusting longitudinal magnification (scanning speed) .............. 3-3-36 (12) Adjusting exposure amount for enlargement/reduction mode ... 3-3-37 (13) Setting the lens unit rank ........................................................... 3-3-38 (14) Setting the optical section fan motor control ............................. 3-3-39 3-3-5 Drum section ..................................................................................... 3-3-40 (1) Replacing the drum ................................................................... 3-3-40 (2) Cleaning the drum ..................................................................... 3-3-43 (3) Adjusting the copy image after drum replacement (reference) ................................................................................. 3-3-44
1-1-21
1AF 3-3-6 Developing section ............................................................................ (1) Adjusting the position of the magnetic brush (developing roller) (reference) ................................................................................. (2) Adjusting the position of the doctor blade (reference) ............... (3) Adjusting developing bias voltage (reference) .......................... 3-3-7 Transfer and separation section ....................................................... (1) Replacing the charger wires ...................................................... (2) Setting transfer voltage (reference) ........................................... (3) Setting separation shift bias voltage (reference) ....................... 3-3-8 Cleaning section ............................................................................... (1) Detaching and refitting the cleaning blade ................................ (2) Detaching and refitting the drum separation claws ................... 3-3-9 Fixing and eject section .................................................................... (1) Replacing the fixing heater ........................................................ (2) Replacing the fixing unit thermistor ........................................... (3) Detaching and refitting the fixing unit blade .............................. (4) Replacing fixing unit thermostats 1 and 2 ................................. (5) Detaching and refitting the press roller and its separation claws ......................................................................................... (6) Detaching and refitting the heat roller and its separation claws ......................................................................................... (7) Detaching and refitting the lower eject roller ............................. 3-3-10 Others ............................................................................................... (1) Replacing the ozone filter .......................................................... 3-3-46 3-3-46 3-3-47 3-3-48 3-3-49 3-3-49 3-3-52 3-3-53 3-3-54 3-3-54 3-3-56 3-3-57 3-3-57 3-3-59 3-3-60 3-3-61 3-3-62 3-3-64 3-3-66 3-3-67 3-3-67
1-1-22
1AF
CONTENTS 3-4 PCB Initial Settings
3-4-1 Replacing the main PCB ..................................................................... 3-4-1 3-4-2 Adjustment-free variable resistors (VR) .............................................. 3-4-4
1-1-25
1AF
CONTENTS 3-5 Self Diagnostics
3-5-1 Self-diagnostic function ....................................................................... 3-5-1 (1) Self-diagnostic display ................................................................. 3-5-1
1-1-27
1AF
CONTENTS 3-6 Troubleshooting
3-6-1 Image formation problems .................................................................. 3-6-1 (1) No image (entirely white). ............................................................ 3-6-4 (2) No image (entirely black). ............................................................ 3-6-5 (3) Image is too light. ........................................................................ 3-6-6 (4) Background is visible. .................................................................. 3-6-6 (5) A white line appears longitudinally. ............................................. 3-6-7 (6) A black line appears longitudinally. ............................................. 3-6-7 (7) A black line appears laterally. ...................................................... 3-6-8 (8) One side of the copy image is darker than the other. .................. 3-6-9 (9) Black dots appear on the image. ................................................. 3-6-9 (10) Image is blurred. ........................................................................ 3-6-10 (11) The leading edge of the image is consistently misaligned with the original. ................................................................................ 3-6-10 (12) The leading edge of the image is sporadically misaligned with the original. ................................................................................ 3-6-11 (13) Paper creases. .......................................................................... 3-6-11 (14) Offset occurs. ............................................................................ 3-6-12 (15) Black lines appear on both sides of the image in reduction copies. ....................................................................................... 3-6-13 (16) Image is partly missing. ............................................................. 3-6-13 (17) Fixing is poor. ............................................................................ 3-6-14 (18) Image is out of focus. ................................................................ 3-6-14 (19) Image is not square longitudinally. ............................................ 3-6-14 (20) Image is not square laterally. .................................................... 3-6-15 (21) Image is partially missing laterally. ............................................ 3-6-15 3-6-2 Paper misfeeds ................................................................................. 3-6-16 (1) A paper jam in the registration section is detected as soon as the main switch is turned on (J30 appears). .............................. 3-6-16 (2) A paper jam in the eject section is detected as soon as the main switch is turned on (J50 appears). .................................... 3-6-16 (3) A paper jam in the paper drawer is detected during copying (PF appears). ............................................................................ 3-6-16 (4) A paper jam on the bypass table is detected during copying (PF appears). ............................................................................ 3-6-17 (5) A paper jam in the paper conveying or fixing section is detected during copying (J40 appears). .................................... 3-6-17 (6) A paper jam in the eject section is detected during copying (J50 appears). ........................................................................... 3-6-18 3-6-3 PCB terminal voltages ...................................................................... 3-6-19 (1) Composite PCB ......................................................................... 3-6-19 (2) Main PCB .................................................................................. 3-6-21 (3) Operation unit PCB ................................................................... 3-6-26
1-1-29
1AF 3-6-4 Electrical problems ............................................................................ (1) The machine does not operate when the main switch is turned on. .................................................................................. (2) The drive motor does not operate (C20). .................................. (3) The scanner motor does not operate (C30). ............................. (4) The lens motor does not operate (C40). ................................... (5) The toner feed motor does not operate. .................................... (6) The optical section fan motor does not operate. ....................... (7) The internal cooling fan motor does not operate at all or does not turn at full speed. ........................................................ (8) The ozone exhaust fan motor does not operate at all or does not turn at full speed. ........................................................ (9) The paper feed solenoid does not operate. ............................... (10) The bypass solenoid does not operate. .................................... (11) The registration solenoid does not operate. .............................. (12) The halogen lamp does not light. .............................................. (13) The halogen lamp does not turn off. .......................................... (14) The cleaning lamp does not light. .............................................. (15) The fixing heater does not turn on (C61, C63). ......................... (16) The fixing heater does not turn off (fixing unit thermostat 1 or 2 triggered, C64). .................................................................. (17) Main charging does not take place. ........................................... (18) Transfer charging does not take place. ..................................... (19) Separation charging does not take place. ................................. (20) No developing bias is output. .................................................... (21) PF is displayed while paper is present in the paper drawer. ..... (22) The size of paper placed on the bypass table is not displayed correctly. .................................................................... (23) A paper jam is indicated as soon as the main switch is turned on. .................................................................................. (24) OP is displayed when the eject cover is completely closed. ..... (25) Others ........................................................................................ 3-6-5 Mechanical problems ........................................................................ (1) No primary paper feed. .............................................................. (2) No secondary paper feed. ......................................................... (3) Skewed paper feed. .................................................................. (4) The scanner does not travel. ..................................................... (5) Multiple sheets of paper are fed at one time. ............................ (6) Paper jams. ............................................................................... (7) Toner drops on the paper conveying path. ................................ (8) Abnormal noise is heard. ........................................................... 3-6-30 3-6-30 3-6-30 3-6-30 3-6-31 3-6-31 3-6-31 3-6-31 3-6-32 3-6-32 3-6-32 3-6-32 3-6-33 3-6-33 3-6-33 3-6-33 3-6-34 3-6-34 3-6-34 3-6-35 3-6-35 3-6-35 3-6-36 3-6-36 3-6-37 3-6-37 3-6-38 3-6-38 3-6-38 3-6-38 3-6-38 3-6-38 3-6-38 3-6-39 3-6-39
1-1-30
1AF
CONTENTS 3-7 Appendixes
Timing chart No. 1 ......................................................................................... 3-7-1 Timing chart No. 2 ......................................................................................... 3-7-2 Timing chart No. 3 ......................................................................................... 3-7-3 Composite PCB 1/3 ....................................................................................... 3-7-4 Composite PCB 2/3 ....................................................................................... 3-7-5 Composite PCB 3/3 ....................................................................................... 3-7-6 Operation unit PCB ....................................................................................... 3-7-7 Main PCB ...................................................................................................... 3-7-8 General connection diagram ......................................................................... 3-7-9 General wiring diagram ............................................................................... 3-7-10
1-1-33
THEORY AND CONSTRUCTION SECTION
DC-1560/2050 (KME) S/M
I Theory and Construction Section
I
1AF
CONTENTS 1-1 Specifications
1-1-1 Specifications DC-2050 ...................................................................... 1-1-1 1-1-2 Specifications DC-1560 ...................................................................... 1-1-3
1-1-5
1AF
1-1-1 Specifications DC-2050
Type ................................. Desktop Copying system .................. Dry, indirect electrostatic system Originals ........................... Sheets, books and 3-dimensional Maximum size: A3/11" × 17" Original feed system ............ Fixed Copy paper ........................ Plain paper: 60 80 g/m2 for drawer feed 60 200 g/m2 for bypass feed Special paper: OHP film, colored paper and letter head Note: Use the bypass for special paper. Copying sizes ..................... Maximum: A3/11" × 17" Minimum: A6R/51/2" × 81/2" Magnification ratios ............... 64 141%, 1% increments Fixed ratios: Metric 1:1 ± 0.8%, 1:1.410/1:1.270/1:1.220/1:1.150/1:1.100/ 1:1.060/1:0.910/1:0.900/1:0.860/1:0.810/1:0.770/ 1:0.750/1:0.700/1:0.650/1:0.640 Inch 1:1 ± 0.8%, 1:1.290/1:1.210/1:0.780/1:0.770/1:0.730/ 1:0.640 Copy speeds ........................ At 100% magnification: A4/11" × 81/2": 20 copies/min. A3/11" × 17": 12 copies/min. B4 (257 × 364 mm)/81/2" × 14": 13 copies/min. First copy time ..................... 4.9 s or less (A4/11" × 81/2", 100% magnification, manual exposure) Warm-up time ..................... 45 s or less (room temperature 20°C/68°F, 65% RH) Paper feed system ............... Automatic feed from the paper drawer Capacity: 250 sheets of 80 g/m2 Manual feed from the bypass table Capacity: 50 sheets of 80 g/m2 Multiple copying .................. 1 100 copies Photoconductor .................. OPC (drum diameter 60 mm) Charging system .................. Single positive corona charging (drum potential: 850 V DC) Exposure system .................. Slit exposure Lens ................................. Fixed-focal lens, f: 215 mm, F8.0 Light source ........................ Halogen lamp, 350 W Developing system ............... Dry, magnetic brush Developer: 2-component, ferrite carrier and N27T black toner Toner density control: toner sensor Toner replenishing: automatic from a toner hopper Transfer system .................. Single positive corona charging, 5.2 kV DC Separation system ............... Single AC corona charging, 4.1 kV AC
1-1-1
1AF Fixing system ..................... Heat roller Heat source: halogen heater (980 W) Control temperature: 175°C/347°F (at normal ambient temperature) Abnormally high temperature protection devices: 140°C/284°F and 150°C/302°F thermostats Fixing pressure: 127.4 N Charge erasing system ......... Exposure by cleaning lamp Cleaning system .................. Cleaning blade Functions ........................... (1) Self-diagnostics (2) Simulation (3) Auto clear (30 270 s, in intervals of 30 s) (4) Auto start (5) Auto shutoff (15 120 min, in intervals of 15 min) (6) Auto preheat/energy saving (5 45 min, in intervals of 5 min) (7) Auto exposure (8) Photo mode (9) Manual magnification selection (10) Auto magnification selection (by original size entry) (11) Auto paper selection (by original size entry) (12) Auto selection (when the ADF is used) Power source ..................... 220 240 V AC, 50/60 Hz, 6.3 A Rated power consumption ...... 1450 W Dimensions ........................ 775 (W) × 590 (D) × 375 (H) mm 301/2" (W) × 231/4" (D) × 143/4" (H) Weight .............................. Approx. 39 kg/85.8 lbs. Floor requirements ............... 1145 (W) × 590 (D) mm 451/16" (W) × 231/4" (D) Accessories ........................ Copy tray Options .............................. Key counter, ADF
1-1-2
349
1-1-2 Specifications DC-1560
Type ................................. Desktop Copying system .................. Dry, indirect electrostatic system Originals ........................... Sheets and books Maximum size: A3/11" × 17" Original feed system ............ Fixed Copy paper ........................ Plain paper: 60 80 g/m2 for drawer feed 60 200 g/m2 for bypass feed Special paper: OHP film, transparencies and colored paper Note: Use the bypass for special paper. Copying sizes ..................... Maximum: A3/11" × 17" Minimum: A6R/51/2" × 81/2" Magnification ratios ............... 64 141%, 1% increments Fixed ratios: Metric 1:1 ± 0.8%, 1:1.410/1:1.270/1:1.220/1:1.150/1:1.100/ 1:1.060/1:0.910/1:0.900/1:0.860/1:0.810/1:0.770/ 1:0.750/1:0.700/1:0.650/1:0.640 Inch 1:1 ± 0.8%, 1:1.290/1:1.210/1:0.780/1:0.770/1:0.730/ 1:0.640 Copy speeds ........................ At 100% magnification: A4/11" × 81/2": 15 copies/min. A3/11" × 17": 10 copies/min. B4 (257 × 364 mm)/81/2" × 14": 11 copies/min. First copy time ..................... 4.9 s or less (A4/11" × 81/2", 100% magnification, manual exposure) Warm-up time ..................... 45 s or less (room temperature 20°C/68°F, 65% RH) Paper feed system ............... Automatic feed from the paper drawer Capacity: 250 sheets of 80 g/m2 Manual feed from the bypass table Capacity: 50 sheets of 80 g/m2 Multiple copying .................. 1 100 copies Photoconductor .................. OPC (drum diameter 60 mm) Charging system .................. Single positive corona charging (drum potential: 850 V DC) Exposure system .................. Slit exposure Lens ................................. Fixed-focal lens, f: 215 mm, F8.0 Light source ........................ Halogen lamp, 350 W Developing system ............... Dry, magnetic brush Developer: 2-component, ferrite carrier and N27T black toner Toner density control: toner sensor Toner replenishing: automatic from a toner hopper Transfer system .................. Single positive corona charging, 5.2 kV DC Separation system ............... Single AC corona charging, 4.1 kV AC
1-1-3
349 Fixing system ..................... Heat roller Heat source: halogen heater (850 W with 120 V input, 980 W with 240 V input) Control temperature: 175°C/347°F (at normal ambient temperature) Abnormally high temperature protection devices: 140°C/284°F and 150°C/302°F thermostats Fixing pressure: 127.4 N Charge erasing system ......... Exposure by cleaning lamp Cleaning system .................. Cleaning blade Functions ........................... (1) Self-diagnostics (2) Simulation (3) Auto clear (30 270 s, in intervals of 30 s) (4) Auto start (5) Auto shutoff (6) Auto preheat/energy saving (7) Auto exposure (8) Photo mode (9) Manual magnification selection (10) Auto magnification selection (by original size entry) (11) Auto paper selection (by original size entry) (12) Auto selection (when the ADF is used) Power source ..................... 220 240 V AC, 50/60 Hz, 6.3 A 120 V AC, 60 Hz, 11.6 A Rated power consumption ...... 1450 W (220 240 V AC) 1350 W (120 V AC) Dimensions ........................ 595 (W) × 590 (D) × 375 (H) mm 237/16" (W) × 231/4" (D) × 143/4" (H) Weight .............................. Approx. 39 kg/66 lbs. Floor requirements ............... 1120 (W) × 590 (D) mm 441/8" (W) × 231/4" (D) Accessories ........................ Copy tray Options .............................. Key counter, ADF
1-1-4
1AF
CONTENTS 1-2 Handling Precautions
1-2-1 Drum ................................................................................................... 1-2-1 1-2-2 Developer and toner ........................................................................... 1-2-1
1-1-7
1AF
1-2-1 Drum
Note the following when handling or storing the drum. · When removing the image formation unit, never expose the drum surface to strong direct light. · Keep the drum at an ambient temperature between 20°C/ 4°F and 40°C/104°F and at a relative humidity not higher than 85%RH. Avoid abrupt changes in temperature and humidity. · Avoid exposure to any substance which is harmful to or may affect the quality of the drum. · Do not touch the drum surface with any object. Should it be touched by hands or stained with oil, clean it. · If the machine is left open for more than 5 minutes for maintenance, remove the drum and store it in the drum storage bag (P/N 78369020).
1-2-2 Developer and toner
Store the developer and toner in a cool, dark place. Avoid direct light, high humidity and temperature.
1-2-1
1AF
CONTENTS 1-3 Mechanical Construction
1-3-1 1-3-2 1-3-3 1-3-4 Part names and their functions ........................................................... 1-3-1 Machine cross section ........................................................................ 1-3-3 Drive system ....................................................................................... 1-3-4 Mechanical construction ..................................................................... 1-3-6 (1) Paper feed section ...................................................................... 1-3-6 (1-1) Paper feed from the paper drawer .................................... 1-3-8 (1-2) Paper feed from the bypass table ..................................... 1-3-9 (2) Main charging section ............................................................... 1-3-10 Surface potential correction control ........................................... 1-3-13 (3) Exposure section ....................................................................... 1-3-15 Exposure control for manual exposure and photo modes ......... 1-3-18 Exposure control for auto exposure mode ................................ 1-3-19 Light intensity correction for enlargement and reduction modes ........................................................................................ 1-3-20 Light intensity correction by the user setting ............................. 1-3-20 (4) Developing section .................................................................... 1-3-21 Formation of the magnetic brush ............................................... 1-3-23 Toner density control ................................................................. 1-3-25 Correcting toner sensor output voltage ..................................... 1-3-27 Toner level detection ................................................................. 1-3-30 (5) Transfer and separation section ................................................ 1-3-31 (6) Cleaning section ........................................................................ 1-3-34 (7) Charge erasing section ............................................................. 1-3-35 (8) Fixing and eject section ............................................................. 1-3-37 Heating the heat roller and detecting temperature .................... 1-3-39 Fixing temperature control ......................................................... 1-3-40 Paper separation ....................................................................... 1-3-42
1-1-9
E A E
A
A
E
A
E A E
1AF
1-3-1 Part names and their functions
Figure 1-3-1 1. Operation panel 2. Original size indicator 3. Original holder 4. Main switch 5. Bypass table 6. Auxiliary table 7. Insertion guides 8. Paper drawer 9. Toner cartridge 10. Paper conveying section lever 11. Image formation unit 12. Front cover 13. Bypass cover 14. Total counter 15. Key counter (option) 16. Copy tray 17. Eject cover 18. Drawer bottom plate 19. Width guide tab 20. Width guide 21. Length guide
1-3-1
E A E A A E DC-1560/2050 (KME) S/M E A A E
E A E
A
E
A
A
E A E
1AF Metric 1. Auto selection key 2.Autoselectionindicator 3.Allclear/resetkey 4. Print key 5. Copy start indicator
A3 A4 R A5 R A4 B4 B5 R B5 Folio 11 15 A3 A4 R A5 R A4 B4 B5 R Folio U
1 2 3 4 5 6 7
1 % 4
2
3
6. Stop/clear key 7. Numeric keys 8. Exposure adjustment keys 9. Exposure indicators 10. Auto/manual exposure key 11. Auto exposure indicator 12.Photooriginalindicator 13. Zoom-up key 14. Zoom-down key 15. Manual key 16. Manual indicator 17.Copyquantity/magnificationdisplay 18. Recall % key 19. Zoom copy indicator 20. Paper source indicators
5
6
CA
64%
141%
7
8
9
0
/C
Inch
21.Checkpapersize/directionindicator 22. Maintenance indicator 23. Add toner indicator 24. ADF jam indicator
11 17 812 14 812 11 R 512 812 11 8 12 11 15 11 17 812 14 812 11 R 512 812 11 8 12 U
Manual Zoom ( ) Add Toner Maintenance Check Paper Size / Direction Zoom ( ) Recall %
1 % 4
2
3
Auto Selection
25. Paper select key 26. Paper size indicators 27.Originalselectkey 28.Originalsizeindicator
5
6
Reset
7
8
9
Print
Auto Original Paper Select Photo Original Dark Light
0
Stop/ Clear
Figure 1-3-2 Operation panel
1-3-2
E A E A E A DC-1560/2050 (KME) S/M E A A E
1AF
1-3-2 Machine cross section
Light path Paper path
Figure 1-3-3 Machine cross section 1. Paper feed section (page 1-3-6) 2. Main charging section (page 1-3-10) 3. Exposure section (page 1-3-15) 4. Developing section (page 1-3-21) 5. Transfer and separation section (page 1-3-31) 6. Cleaning section (page 1-3-34) 7. Charge erasing section (page 1-3-35) 8. Fixing and eject section (page 1-3-37)
1-3-3
1AF
1-3-3 Drive system
As viewed from machine rear Figure 1-3-4 Drive system copier main body 1. Drive motor gear 2. Gear 60/40 3. Gear 60/24 4. Gear 64/20 5. Gear 23 6. Gear 60/50 7. Blade thrust gear 31 8. Toner recycle gear 19 9. Developing drive belt 10. Pulley 16 (machine rear) 11. Gear 25 (machine front) 12. Registration gear 15/30 13. Feed belt 14. Registration collar 15. Pulley 15 16. Tension pulley 15 17. Gear 33/14 (machine rear) 18. Developing gear 32 (machine front) 19. Developing gear 23 20. Developing gear 30 21. Paper feed drive belt 22. Tension pulley 15 23. Pulley 32 24. Gear 18 25. Idle gear 38 26. Bypass gear 38 27. Gear 30/18 28. Gear 25 29. Idle gear 30. Idle gear 38 31. Paper feed gear 38 32. Pulley 14 33. Gear 20 34. Retard gear 18 35. Limiter gear 15 36. Gear 80/34 37. Fixing drive belt 38. Pulley 30 39. Fixing drive gear 22 40. Heat roller gear 40 41. Eject idle gear 30 42. Eject gear 22 43. Scanner motor pulley 44. Scanner drive pulley 1 45. Scanner drive pulley 2 46. Scanner drive belt 1 47. Scanner drive belt 2 48. Scanner wire drum 49. Scanner wire 50. Scanner wire pulley 51. Scanner wire pulley
1-3-4
1AF
As viewed from machine rear Figure 1-3-5 Drive system image formation unit 1. Blade thrust gear 31 2. Toner recycle gear 19 3. Magnet roller gear 17 4. Developing idle gear 19 5. Left spiral gear (machine rear) 6. Developing gear 28 (machine front) 7. Developing gear 31 (machine front)
1-3-5
1AF
1-3-4 Mechanical construction
(1) Paper feed section
Figure 1-3-6 Paper feed section 1 2 3 4 5 6 7 8 9 0 ! Bypass table Bypass lift Bypass upper pulley Bypass lower pulley Bypass lower guide Drawer bottom plate Drawer spring Paper feed pulleys A and B Upper registration roller Lower registration roller Registration stopper @ Upper pre-transfer roller # Lower pre-transfer roller $ Registration guide % Upper pre-transfer guide ^ Bypass solenoid (BYPSOL) & Paper feed solenoid (PFSOL) * Registration solenoid (RSOL) ( Bypass paper length switch (BYPPLSW) ) Bypass paper width switch (BYPPWSW) / Registration switch (RSW)
1-3-6
1AF The paper feed section consists of the primary feed and secondary feed subsections. Primary feed conveys paper from the paper drawer or the bypass table to the upper and lower registration rollers, at which point secondary paper feed takes place and the paper travels to the transfer section in sync with the exposure timing.
CN12-2
BYPPLSW CN17-2 CN2-2 CN2-4 CN14-2 MPCB RSOL PFSOL BYPSOL RSW
Figure 1-3-7 Paper feed section block diagram
1-3-7
1AF (1-1) Paper feed from the paper drawer The paper drawer consists of the drawer bottom plate, drawer springs and other components and can hold up to 250 sheets of copy paper. Paper is fed out of the drawer by the rotation of paper feed pulleys A and B.
Prescan start Print key
HPSW
RSW
SM
PFSOL 250 ms RSOL
147 P+140 ms *1 100 ms
Auto exposure mode, A4/11" × 81/2" copy paper, magnification ratio 100% *1 Varies depending on the setting by simulation 27. Timing chart 1-3-1 Paper feed from the paper drawer A When the print key is pressed, the paper feed solenoid (PFSOL) turns on for 250 ms, rotating paper feed pulleys A and B to perform primary feed. Then the paper is fed by the upper and lower registration rollers and its leading edge stops at the registration stopper to create slack in the paper before registration. B The leading edge of the paper turns the registration switch (RSW) on. C The scanner starts scanning and the home position switch (HPSW) turns off. After 147 pulses + 140 ms, the registration solenoid (RSOL) turns on and the registration stopper lowers. The lower registration and pre-transfer rollers convey the paper to start secondary feed. D 100 ms after the trailing edge has turned the registration switch (RSW) off, the registration solenoid (RSOL) turns off to complete secondary paper feed.
1-3-8
1AF (1-2) Paper feed from the bypass table The bypass table can hold up to 50 sheets of paper at one time. When the print key is pressed, the bypass solenoid (BYPSOL) turns on, rotating the bypass upper pulley, while the bypass lift is raised until the paper comes into contact with the bypass upper pulley. The paper on the bypass table is then conveyed to the secondary paper feed section. The bypass lower pulley rotates opposite to the paper feed direction so that the torque limiter prevents multiple sheets from being fed at one time.
Prescan start Print key
HPSW
RSW
SM
BYPSOL 250 ms RSOL
147 P+140 ms *1 100 ms
Auto exposure mode, A4/11" × 81/2" copy paper, magnification ratio 100% *1 Varies depending on the setting by simulation 27. Timing chart 1-3-2 Paper feed from the bypass table A When the print key is pressed, the bypass solenoid (BYPSOL) turns on for 250 ms, which raises the bypass lift and rotates the bypass lower pulley to perform primary paper feed. The paper is then fed by the upper and lower registration rollers until the leading edge stops at the registration stopper to create slack in the paper before registration. B The leading edge of the paper turns the registration switch (RSW) on. C The scanner starts scanning and the home position switch (HPSW) turns off. After 147 pulses + 140 ms, the registration solenoid (RSOL) turns on and the registration stopper lowers. The lower registration and pre-transfer rollers convey the paper to start secondary feed. D 100 ms after the trailing edge of the paper turns the registration switch (RSW) off, the registration solenoid (RSOL) turns off to complete secondary paper feed.
1-3-9
1AF (2) Main charging section The main charging section consists of the drum and main charger. The drum is electrically charged uniformly by means of a grid to form a latent image on the surface.
Main charger
Tungsten wire Main charger grid
Figure 1-3-8
Main charging section
1-3-10
1AF
Figure 1-3-9 Main charger 1 2 3 4 5 6 Main charger front housing Main charger rear housing Main charger shield Tungsten wire Main charger grid Grid tension plate 7 8 9 0 ! @ Main charger front lid Main charger rear lid Charger spring Charger terminal Charger wire retainer pin Film
CN2-1 CPCB CN1-21 CN1-27 CN1-24 CN1-20
24 V DC
CN2-1
MC REM ALARM GRID CONT DB REM
CN1-7 CN1-1 CN1-4 CN1-8 HVTPCB
MC
Grid Drum
MPCB
Figure 1-3-10 Main charging section block diagram
1-3-11
1AF
Scanner return start Print key Forward SM 300 ms BL All on 50 ms MC REM Reverse
Timing chart 1-3-3 Main charging A 300 ms after the print key is pressed, all the blank lamps (BL) turn on. B 50 ms after the all blank lamps (BL) have turned on, main charging starts. C As soon as the scanner starts to return, main charging ends.
1-3-12
1AF Surface potential correction control The drum surface potential is corrected for the external temperature and humidity. If the external temperature is 24°C/75.2°F or less and the absolute humidity exceeds 25.0 g/m3, the drum surface potential is corrected as in the table bellow. The external temperature and relative humidity are detected by the external temperature thermistor (ETTH) and humidity sensor (HUMSENS) and the absolute humidity is calculated from these values. The surface potential is corrected by varying the grid control voltage (GRID CONT) output from the main PCB (MPCB) to the high-voltage transformer PCB (HVTPCB).
Table 1-3-1
Absolute humidity (g/m3) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0
Surface potential correction value vs. absolute humidity
Correction value (V) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Absolute humidity (g/m3) 10.5 11.0 11.5 12.0 12.5 13.0 13.5 14.0 14.5 15.0 15.5 16.0 16.5 17.0 17.5 18.0 18.5 19.0 19.5 20.0 Correction value (V) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Absolute humidity (g/m3) 20.5 21.0 21.5 22.0 22.5 23.0 23.5 24.0 24.5 25.0 25.5 26.0 26.5 27.0 27.5 28.0 28.5 29.0 29.5 30.0 Correction value (V) 0 0 0 0 0 0 0 0 0 0 4 8 12 16 20 24 28 32 36 40
1-3-13
1AF
45 40
Absolute humidity (g/m3)
100%
35 30 25 20 15 10 5 0 10 50
60%
40%
20%
15 59
20 68
25 77
30 86
35 (°C) 95 (°F)
Temperature (°C/°F)
Figure1-3-11
Absolute humidity vs. relative humidity
Table 1-3-2
Temperature (°C/°F) 0/32 1/33.8 2/35.6 3/37.4 4/39.2 5/41 6/42.8 7/44.6 8/46.4 9/48.2 10/50 11/51.8 12/53.6
Surface potential correction value vs. external temperature
Temperature (°C/°F) 13/55.4 14/57.2 15/59 16/60.8 17/62.6 18/64.4 19/66.2 20/68 21/69.8 22/71.8 23/73.4 24/75.2 25/77 Correction value (V) 40 37 33 30 27 23 20 17 13 10 7 3 0 Temperature (°C/°F) 26/78.8 27/80.6 28/82.4 29/84.2 30/86 Correction value (V) 0 0 0 0 0
Correction value (V) 83 80 77 73 70 67 63 60 57 53 50 47 43
1-3-14
Relative humidity (%)
80%
1AF (3) Exposure section
Figure 1-3-12 Exposure section 1 2 3 4 5 6 7 8 9 0 Mirror 1 Mirror 2 Mirror 3 Mirror 4 Mirror 5 Mirror 6 Halogen lamp (HL) Optical section thermostat (TH3) Lens Light source unit 1 ! Light source unit 2 @ Main reflector # Auxiliary reflector $ Scanner motor (SM) % Optical section fan motor (OPFM) ^ AE sensor (AES) & Home position switch (HPSW) * Lens home position switch (LHPSW) ( Dust filter
1-3-15
1AF This copier employs a slit exposure system with a fixed original table, and a halogen lamp (HL) as the light source. The optical section consists of light source units 1 and 2. Light source unit 1 carries the halogen lamp and the main and auxiliary reflectors. Each unit travels from one side of the machine to the other along scanner rails at machine front and rear. When an enlargement or a reduction ratio is selected, the scanning speeds of the two light source units and the positions of the lens and mirrors 4 and 5 are changed, altering the distance between the original and the drum. At any magnification ratio, light source unit 2 travels at a half speed of unit 1. A cooling fan is installed to exhaust heat generated by the halogen lamp. If an abnormally high temperature is detected around light source unit 1, the optical section thermostat (TH3) shuts off the supply to the halogen lamp.
Original
CPCB HPSW AES HL TH3 CN1-1 CN1-3 SM LM LHP SW
CN8-1 CN8-6
CN5-7 CN5-12
CN7-2
CN5-5
CN5-2
MPCB
Figure 1-3-13 Exposure section block diagram
1-3-16
CN4-5
HL CONT
CN2-7
1AF
Scan start Prescan start Scanner return start Print key 10 P HPSW 480 ms 1232 P SM HL Forward 480 ms 1687 P 10 P
Reverse
Forward
Reverse
Auto exposure mode, A4/11" × 81/2" original Timing chart 1-3-4 Scanner travel
A When the print key is pressed, the halogen lamp (HL) lights at the intensity for prescan. B 480 ms after the halogen lamp (HL) has turned on, the scanner motor (SM) rotates forward for prescan. C After rotating forward 1232 pulses, the scanner motor (SM) reverses to return the scanner to the home position. At the same time, the halogen lamp (HL) turns off. D 10 pulses after the home position switch (HPSW) has been turned on, the scanner motor (SM) turns off and the scanner stops. At the same time, the halogen lamp (HL) lights for exposure. E 480 ms after turning off, the scanner motor (SM) rotates forward for scanning. F After rotating forward for 1687 pulses, the scanner motor (SM) reverses to return the scanner to the home position. At the same time, the halogen lamp (HL) turns off. G 10 pulses after the home position switch (HPSW) has turned on, the scanner motor (SM) turns off and the scanner stops.
1-3-17
1AF Exposure control for manual exposure and photo modes The halogen lamp light intensity for manual exposure and photo modes is calculated from the data obtained by running simulation 24.
Light intensity value Manual exposure mode Photo mode Drum potential 850 V DC
Drum potential 680 V DC
Drum potential 680 V DC
0 1-2 1-3 1-4 1-5 1-6 1-7 1 2 3 4 5 6 7 7-1 7-2 7-3 7-4 7-5 7-6
Exposure scale (Exp.)
Figure 1-3-14 Exposure gradient setting · Exposure control for manual exposure mode The gradient between Exp. 1-2 and Exp. 7 is determined from the halogen lamp light intensity values for Exp. 1, Exp. 4 and Exp. 7 set in simulation 24. For exposure settings Exp. 7-1 and above the drum potential is set 170 V below the normal level and the light intensity is reduced since the intensity at such high exposure levels cannot be increased by simply increasing the halogen lamp control voltage. The amount of exposure for the high settings between Exp. 7-1 and Exp. 7-6 is determined by the halogen lamp light intensity value for Exp. 7-1 set in simulation 24 and the gradient between Exp. 4 and Exp. 7. · Exposure control for photo mode The drum potential is set 170 V below the normal level and the halogen lamp light intensity value is set low for photo mode. The halogen lamp light intensity value for photo-mode Exp. 4 is determined by running simulation 24. The light intensity for manual-mode Exp. 1-4 is used as the value for photomode Exp. 1, which determines the gradient between Exp. 1 and Exp. 4 for photo mode. Similarly, the light intensity for manual-mode Exp. 7-3 is used as the value for photo-mode Exp. 7, which determines the gradient between photo-mode Exp. 4 and Exp. 7.
1-3-18
1AF Exposure control for auto exposure mode In auto exposure mode, the halogen lamp lights at the intensity set for mode 1 in simulation 22 to perform prescan. The exposure level to copy that particular original is determined by using the value read in by the AE sensor.
AE detection (prescan) Exposure Scanner movement 148 mm Original Original leading edge 100 mm Detection width Original leading edge
Figure 1-3-15 AE sensor detection width
Halogen lamp voltage
Drum potential 680 V DC Manual-mode Exp. 7-1 Drum potential 850 V DC Manual-mode Exp. 4
0
Mode 3, sim. 22 Mode 2, sim. 22 (NPTC level) (NTC level) AE sensor read-in value
Figure 1-3-16 Exposure control for auto exposure mode The halogen lamp voltage is controlled so that the lamp lights at the intensity for manualmode Exp. 4 when the AE sensor read-in value is the NTC level set in mode 2 by simulation 22, and at the intensity for manual-mode Exp. 7-1 when the read-in value is the NPTC level set in mode 3. In auto exposure mode, the drum potential is decreased by 170 V from the normal level and the halogen lamp voltage is increased when the AE sensor read-in value is below the setting for mode 3 in simulation 22. When the AE sensor read-in value falls in the range between the mode 3 and mode 2 settings by simulation 22, the halogen lamp voltage is controlled based on the gradient determined by the values set by simulation 24. For read-in values above the mode 2 setting of simulation 22, the halogen lamp voltage is kept at a constant level so that the lamp lights at the intensity for manual-mode Exp. 4.
1-3-19
1AF Light intensity correction for enlargement and reduction modes The halogen lamp light intensity for enlargement and reduction modes is determined by the value for copying at 100% magnification and the correction values set by simulation 29.
Light intensity correction value
Mode 1, sim. 29 (141%) Mode 2, sim. 29 (64%)
0
64
100
141
Magnification ratio (%)
Figure 1-3-17 Correction of light intensity for reduction and enlargement modes The correction values for reduction (64%) and enlargement (141%) copying are linked by a straight line through the value for 100% magnification, and the light intensity is corrected for individual magnification ratios according to the gradients.
Light intensity correction by the user setting The light intensity data can be corrected in exposure adjustment of the user settings by pressing an exposure adjustment key in manual exposure mode or the auto/manual exposure key in auto exposure mode for 5 s. The light intensity correction value is 0 at Exp. 4 and changes at 4 bits per 0.5 steps of the exposure scale.
Light intensity correction value (bits)
18
0 4 bits 0.5 steps
18
1
4
7 Exposure scale (Exp.)
Figure 1-3-18 Light intensity correction by user setting
1-3-20
1AF (4) Developing section The developing section consists of the developing assembly and toner hopper.
Developing assembly
Figure 1-3-19 Developing section The developing assembly consists of the developing roller where a magnetic brush is formed, doctor blade and the developing spirals that agitate the developer. In the toner hopper new toner from the toner cartridge is mixed with residual toner recovered from the cleaning section, and the mixture is conveyed to the developing assembly. The amount of toner in the toner hopper is monitored by the toner level sensor (TLDS).
1-3-21
1AF
Cleaning assembly Cleaning spiral Hopper paddle A Hopper spiral
Developing assembly Right developing spiral Toner hopper Left developing spiral
Toner level sensor Hopper paddle B
Toner feed motor Toner flow
Figure 1-3-20 Toner recycling
1-3-22
1AF Formation of the magnetic brush The developing roller consists of a magnet roller with five poles and a sleeve roller. Rotation of the sleeve roller around the magnet roller entrains developer, which in turn forms a magnetic brush at pole N1 on the magnet roller. The height of the magnetic brush is regulated by the doctor blade; the developing result is affected by the po